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1.
Rev. bras. reprod. anim ; 47(1): 42-48, jan.-mar. 2023. ilus
Artigo em Português | VETINDEX | ID: biblio-1434884

Resumo

As neoplasias mamárias representam a terceira neoplasia mais comum em gatas, enquanto nos machos a incidência é rara. Esse trabalho relata o caso de um gato macho, não castrado, atendido no Hospital Veterinário da Universidade Estadual do Ceará, com uma neoformação mamária. O diagnóstico inicial, obtido por meio de punção aspirativa por agulha fina, sugeriu a presença de carcinoma mamário. Exames de imagem como a radiografia torácica e a ultrassonografia abdominal não evidenciaram a presença de metástase no parênquima pulmonar e nos órgãos abdominais, respectivamente. O tratamento instituído foi a remoção cirúrgica da neoformação, pela técnica de mastectomia parcial bilateral. O exame histopatológico da massa evidenciou uma hiperplasia fibroepitelial. Diante disso, conclui-se que, apesar de raras, as neoformações mamárias em gatos do sexo masculino podem ocorrer, devendo, dessa forma, compor parte da lista de diagnósticos diferenciais para aumentos de volume na região ventral desses animais.(AU)


Mammary neoplasms represent the third most common neoplasm in queens, while in tomcats the incidence is rare. This study reports the case of a tomcat, not neutered, treated at the Veterinary Hospital of the State University of Ceará, with a mammary neoformation. The initial diagnosis, obtained through aspiration cytology, suggested the presence of mammary carcinoma. Imaging tests such as thoracic radiography and abdominal ultrasound, did not show the presence of metastasis in the lung parenchyma and abdominal organs, respectively. The chosen treatment was the surgical removal of the neoformation, using the bilateral partial mastectomy technique. Histopathological examination of the mass showed a mammary fibroepithelial hyperplasia. Therefore, it is concluded that, although rare, mammary neoformations in male cats can occur, thus, it should be part of the list of differential diagnoses for increases in volume in the ventral region of these animals.(AU)


Assuntos
Animais , Masculino , Neoplasias Mamárias Animais/diagnóstico , Neoplasias Fibroepiteliais/diagnóstico , Glândulas Mamárias Animais/patologia , Hiperplasia/veterinária
2.
Rev. bras. reprod. anim ; 47(2): 81-85, abr.-jun. 2023.
Artigo em Inglês | VETINDEX | ID: biblio-1434995

Resumo

Sows do not produce enough milk to sustain optimal growth of their litters. This is particularly important when considering the current hyperprolific sow genetic lines. Mammary development needs to be considered to improve potential milk yield. One can only attempt to stimulate mammogenesis during periods when rapid mammary development is already ongoing. There are two such periods before lactation starts, namely, from three months of age until puberty, and from 90 days of gestation until farrowing. Early studies showed that a 20% feed restriction from 90 days of age until puberty drastically reduces mammary parenchymal tissue mass. Yet, in a more recent study, sow milk yield was not altered following a 10% or 20% feed restriction, or a 25% dietary fibre addition from 90 days of age to breeding. This absence of effect was likely due to the greater feed intake of control gilts in that recent study compared with the older studies, and suggested that feed intake of growing gilts can be reduced to 2.7 kg/d (but not 2.1 kg/d) without detrimental effects on future milk yield. During prepuberty, inclusion of the phytoestrogen genistein in the diet increases the number of mammary parenchymal cells. During late gestation, feeding very high energy levels may have detrimental effects on mammary development and subsequent milk production. Feed intake throughout gestation is also important because of its effect on body condition, with gilts that are too thin (< 16 mm backfat thickness) in late gestation showing less mammary development. A 40% increase in lysine intake via inclusion of additional soybean meal to the diet of gilts from days 90 to 110 of gestation increased mammary parenchymal mass by 44%. Increasing circulating concentrations of the growth factor IGF-1 during late gestation also increased mammary parenchymal mass by 22%. Current data clearly demonstrate that feeding management before lactation can be used to enhance mammary development, hence future milk yield.(AU)


Assuntos
Animais , Feminino , Gravidez , Suínos/fisiologia , Glândulas Mamárias Animais/crescimento & desenvolvimento , Otimização de Processos
3.
Anim. Reprod. (Online) ; 20(1): e20220086, 2023. tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1418538

Resumo

The identification of putative prognostic factors in canine mammary neoplasms (CMNs) has been focused on tissue-specific biomarkers, but the serum biomarkers, including cancer antigen 15-3 (CA 15-3), c-reactive protein (CRP), and lactate dehydrogenase (LDH) have been demonstrated to display clinical application in cases of CMNs. The aim of the study was to evaluate the levels of these serum biomarkers and their association with well-established prognostic factors in CMNs. Samples from 15 female canines with CMNs and 15 clinically healthy ones were collected. The results were evaluated using the Tukey's, Pearson, or Spearman tests. The cut-off point, sensitivity, specificity, and area under curve (AUC) were evaluated using the receiver operating characteristic (ROC) curve analysis in a logistic regression model (P<0.05). The levels of CA 15-3, CRP and LDH were significantly higher in the serum of female dogs with CMNs compared to the healthy ones. Moreover, these factors were positively correlated with ulceration, tumor size, histopathological grade, metastatic lymph node, and clinical staging. Female dogs with CMNs were found to exhibit highest serum levels of CA 15-3, CRP, and LDH. Therefore, they can be applied to improve the efficacy of the diagnosis and prognostic evaluation in casas of CMNs.(AU)


Assuntos
Animais , Feminino , Neoplasias Mamárias Animais/diagnóstico , Cães , Glândulas Mamárias Animais/anatomia & histologia , Proteína C-Reativa/efeitos adversos , Biomarcadores , Mucina-1/efeitos adversos , L-Lactato Desidrogenase/efeitos adversos
4.
Acta Vet. Brasilica ; 17(1): 1-5, 2023. ilus, tab
Artigo em Inglês | VETINDEX | ID: biblio-1436277

Resumo

Mammary tumors have a high prevalence in bitches and women, and are related to high rates of morbidity and mortality. For the human species, thermography has stood out as a diagnostic tool for breast cancer. However, its clinical benefit in bitches remains unknown. Thus, the goal of the present study was to evaluate the diagnostic applicability of infrared thermography for canine mammary tumors, as well as to correlate tumor temperature with mitotic index and tumor volume. Thermographic and digital images of eight bitches with mammary neoplasms were captured. Thermograms were entered into the FLIR tools software and the temperature of 15 tumor and 15 healthy glands from the contralateral mammary chain was analyzed. There was no significant difference (p = 0.786) between the mean temperature of neoplastic (33.71°C ± 1.86) and healthy (33.54°C ± 1.59) glands. There was a negative and moderate correlation between tumor temperature and mitotic index (ρ = -0.52 p = 0.049). However, no correlation was detected between mammary temperature and tumor volume (p = 0.10). Although thermography allowed no distinction between neoplastic and healthy mammary glands in bitches, it may be promising to assess the proliferative rate of tumors. In addition, malignant neoplasms may be more often hypothermic than healthy tissue.(AU)


Os tumores mamários apresentam alta prevalência em cadelas e mulheres, sendo relacionados a elevadas taxas de morbidade e mortalidade. Para a espécie humana, a termografia tem se destacado como ferramenta diagnóstica do câncer de mama. Entretanto, o seu benefício clínico em cadelas permanece desconhecido. Assim, o objetivo do presente estudo foi ava-liar a aplicabilidade diagnóstica da termografia infravermelha para os tumores mamários caninos, bem como correlacionar a temperatura tumoral com o índice mitótico e volume tumoral. Foram capturadas imagens termográficas e digitais de oito cadelas com neoplasias mamárias. Os termogramas foram inseridos no software FLIR tools e analisou-se a temperatura de 15 mamas tumorais e 15 hígidas da cadeia mamária contralateral. Não houve diferença significativa (p = 0,786) entre a tempera-tura média das glândulas neoplásicas (33,71°C ± 1,86) e saudáveis (33,54°C ± 1,59). Houve correlação negativa e moderada entre a temperatura tumoral e índice mitótico (ρ = -0,52 p = 0,049). Entretanto, não foi observada correlação entre tempe-ratura e volume tumoral (p = 0,10). Apesar da termografia não ter permitido a diferenciação das mamas neoplásicas e saudá-veis de cadelas, ela pode ser uma forma promissora para avaliação da taxa proliferativa dos tumores. Além disso, as neoplasias malignas podem apresentar-se mais frequentemente hipotérmicas em relação ao tecido saudável.(AU)


Assuntos
Animais , Feminino , Cães , Termografia/métodos , Neoplasias Mamárias Animais/diagnóstico por imagem , Temperatura Corporal/fisiologia , Índice Mitótico
5.
Sci. agric ; 80: e20220086, 2023. tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1450490

Resumo

The present study explored the predictive values of milk leukocyte differentials (MLD) as a basis for improving the diagnosis of intramammary infections (IMIs) and subclinical mastitis. Quarter milk samples were collected for bacteriological analysis, quarter somatic cell count (qSCC), and MLD. The MLD were assessed using the cytospin technique, direct microscopic smears, and flow cytometry. The predictive values of each single leukocyte population and useful potential indices that could better reflect immune complexity were also calculated. Changes in the percentage of any leukocyte alone failed to substantially improve the predictive value of qSCC in diagnosing IMIs. Although certain parameters increased the area under the receiver operating characteristic curve (ROC curve) as a result of increased specificity values, a slight reduction in sensitivity was observed. The so-called CD8 complex was a unique parameter which improved both the sensitivity (78.79 %) and the specificity (80.77 %) in IMI diagnosis, resulting in the highest area under the ROC curve (0.87). To diagnose subclinical mastitis, the percentage of macrophages and the sum of the percentage PMNLs and T CD8+ cells divided by the percentage of macrophages showed the highest predictive values (sensitivity = 79.63, specificity = 73.68, and area under the ROC curve = 0.83) in the differentiation of the inflammatory condition status of cows. In conclusion, this study provides further insights into using T CD8+ lymphocytes in diagnosing bovine IMIs, combined with PMNLs and macrophages. The antidromic trend of macrophages vs. PMNLs and T CD8+ lymphocytes due to the increasing qSCCs was crucial to differentiating quarters under both inflammatory and non-inflammatory conditions.


Assuntos
Animais , Leite , Inflamação , Glândulas Mamárias Animais , Mastite Bovina
6.
Pesqui. vet. bras ; 43: e07186, 2023. tab, graf
Artigo em Inglês | LILACS-Express | VETINDEX | ID: biblio-1448808

Resumo

ABSTRACT: Canine mammary neoplasms with malignant mesenchymal components, such as carcinosarcomas and sarcomas, belong to an uncommon and histologically heterogeneous group. Little is known about the biological behavior of these histogenic variants. This study aimed to compare the clinicopathological characteristics and the COX-2 immunohistochemical expression of different histologic subtypes of carcinosarcomas and sarcomas. Samples of 23 carcinosarcomas and 15 sarcomas from the mammary glands of female dogs were studied. Medical records were reviewed to obtain clinical data. Subsequently, histology microscope slides were analyzed to assess for mesenchymal subtypes, necrosis, vascular invasion, histologic grades, and lymph node metastasis. Immunohistochemistry was used to assess the COX-2 expression. The malignant mesenchymal proliferation was categorized into osteosarcomas (23/40), fibrosarcomas (5/40), liposarcomas (6/40) and chondrosarcomas (4/40). The osteosarcomatous differentiation was the most predominant type among the sarcomas and carcinosarcomas and was associated with vascular invasion (P=0.010) and lymph node metastases (P=0.014). High COX-2 expression was detected in 14.3% of the carcinosarcomas (carcinoma and/or sarcoma cells) and 27.3% of the sarcomas. The carcinosarcomas and sarcomas had similar clinical and pathological characteristics and developed as large tumors, with intratumoral necrosis and a predominance of high histologic grades, although the frequency of vascular invasion and lymph node metastasis was low. Osteosarcoma subtypes presented more aggressive characteristics than non-osteosarcoma subtypes.


RESUMO: Neoplasias mamárias caninas com componentes mesenquimais malignos, como carcinossarcomas e sarcomas, são um grupo de neoplasias pouco frequentes e histologicamente heterogêneas e pouco se sabe sobre o comportamento biológico das variantes histogênicas. O objetivo desse estudo é comparar as características anatomopatológicas e a expressão imunoistoquímica de COX-2 de diferentes subtipos histológicos de carcinossarcomas e sarcomas. Foram estudados 23 carcinosarcomas e 17 sarcomas da glândula mamária de cadelas. Os prontuários médicos foram revisados para obtenção de dados clínicos. Posteriormente, as lâminas histológicas foram avaliadas para acessar os subtipos mesenquimais, necrose, invasão vascular, grau histológico, metástase linfonodal. A imunoistoquímica foi realizada para avaliar a expressão de COX-2. Os tipos encontrados de proliferação mesenquimal maligna foram osteossarcoma (23/40), fibrossarcoma (7/40), lipossarcoma (6/40) e condrossarcoma (4/40). A diferenciação osteossarcomatosa foi predominante entre os sarcomas e carcinossarcomas e foi associado com invasão vascular (P=0,006) e metástase linfonodal (P=0,014). Uma expressão alta de COX-2 foi detectada em 14,3% dos carcinossarcomas (células carcinomatosas e/ou sarcomatosas) e 27,3% dos sarcomas. Os carcinossarcomas e sarcomas apresentaram características clínicas e patológicas semelhantes e se desenvolveram como tumores grandes, com necrose intratumoral e predomínio de alto grau histológico, mas com baixa frequência de invasão vascular e metástase distante. Os subtipos osteossarcomatosos apresentaram características mais agressivas quando comparados com subtipos não osteossarcomatosos.

7.
Rev. bras. zootec ; 52: e20220064, 2023. tab, graf, ilus
Artigo em Inglês | VETINDEX | ID: biblio-1436789

Resumo

This study integrated four microarray datasets by Robust Rank Aggregation (RRA) method to identify the differentially expressed genes (DEG) in bovine mammary epithelial (BME) cells in response to Escherichia coli and Staphylococcus aureus infection. Furthermore, the GO function and KEGG pathway enrichment analysis of the integrated DEG were performed. Finally, the protein-protein interaction (PPI) network was constructed. A total of 72 integrated DEG were identified from the four datasets. The most significantly enriched terms within the integrated DEG were mainly involved in the immune response. The PPI network of DEG was constructed with 53 nodes. Seventeen genes, which constitute a significant module, were identified as hub genes. Among them, CD40, CXCL6, and NFKBIZ were further screened as the key genes and have the potential to become biomarkers of E. coli and S. aureus mastitis, considering the specificity of biomarkers for diseases. The identified key genes and pathways in this study can assist in the search for biomarkers for mastitis diagnosis and disease resistance breeding.


Assuntos
Animais , Bovinos , Staphylococcus aureus , Doenças dos Bovinos , Células Epiteliais , Escherichia coli , Glândulas Mamárias Animais
8.
Acta sci. vet. (Impr.) ; 51(supl.1): Pub. 855, 2023. ilus
Artigo em Inglês | VETINDEX | ID: biblio-1434506

Resumo

Background: We report the case of 3 cows, 1 ewe, and 1 doe, with chronic mastitis and which underwent a mastectomy. All animals had a history of mastitis, edema with purulent secretion in the udder region, areas of abscess formation, fibrosis, hypogalactia, and agalactia. The animals had already been treated with systemic antibiotic therapy and anti-inflammatory drugs without response. The objective of this work is to describe the surgical and clinicopathological aspects of performing a radical mastectomy in the field in 3 cows and 1 ewe, and a partial mastectomy in a doe, with both procedures performed successfully and considered efficient to maintain the survival of the affected animals, in addition to being economically viable. Cases: In all animals reported in the study, a general and a specific clinical examination were performed, where on palpation of the udder were observed an increase in the region of the mammary apparatus, fluid fluctuation, areas of fibrosis with increased stiffness, and loss of udder functionality. In the case of the doe, there was a functional teat, which was preserved during the surgical procedure. Radical mastectomy was performed in 3 cows and 1 ewe, and the doe underwent a partial mastectomy, with preservation of the functional teat. All animals have fasted for food and water for 48 h. In cows, the anesthetic protocol consisted of 2% xylazine hydrochloride [0.15 mg/kg, intramuscularly (IM)], followed by an epidural block in the lumbosacral region with 2% lidocaine hydrochloride [10 mL]. The midazolam hydrochloride [0.1 mg/kg, intravenously (IV)] and 2% xylazine hydrochloride [0.05 mg/kg, IM] were administered to the ewe and the doe, also associated with lumbosacral epidural anesthesia with 2% lidocaine hydrochloride [5 mL]. The animals were positioned in the right lateral decubitus position and the entire abdominal and udder region were shaved and sanitized for the surgical procedures of radical mastectomy and partial mastectomy, with the use of degerming and topical povidone-iodine. The postoperative period consisted of penicillin-based antibiotic therapy associated with streptomycin [24,000 IU/kg, IM, 10 consecutive days] and flunixin meglumine [2 mg/kg, IM, 3 consecutive days] in cows; enrofloxacin [2.5 mg/kg, IM, 7 consecutive days] and flunixin meglumine [0.5 mg/kg, IM, 5 consecutive days] in the ewe; oxytetracycline [10 mg/kg, IM, 5 applications on alternate days] and flunixin meglumine [0.5 mg/kg, IM, 3 consecutive days] in the doe. In all animals, the cleaning of the surgical wound was performed daily with 10% topical Povidone-iodine and Permethrin ointment, for 14 days, when the stitches were removed. Discussion: The choice of the surgical procedure resulted in improvement of the clinical conditions and increased survival of all animals, and in the case of the doe, partial mastectomy contributed to the preservation of the functional teat, preserving its productive capacity. All anesthetic protocols used and the anatomical positioning of the animals were satisfactory for performing the procedures. Although they are techniques described in the literature with great blood loss, especially in cows, blood transfusion was not required in any of the animals. The stitches were removed 14 days after the surgical procedures, and the surgical wound was completely healed.


Assuntos
Animais , Feminino , Bovinos , Ovinos/cirurgia , Edema/veterinária , Glândulas Mamárias Animais/cirurgia , Mastectomia/veterinária , Mastite/veterinária
9.
Arq. bras. med. vet. zootec. (Online) ; 75(1): 14-26, 2023. tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1416434

Resumo

This study aimed to describe the epidemiological indexes of mastitis, milk quality and udder hygiene in the Compost Barn system, as well as to search for associations between isolated pathogens from milk with compost characteristics. Three dairy herds participated in the study, and the samples were collected during different periods on each farm. Individual milk samples were collected in duplicate for SCC analysis and microbiological culture. Environmental pathogens caused most cases of clinical mastitis on farm 2, and contagious pathogens caused the most cases on farm 1. Bed moisture was not associated with the incidence of environmental pathogens. Most of the animals remained in good udder hygiene during the study. Poor udder hygiene contributed to the increased incidence of environmental pathogens in one of the farms. A higher number of animals with a hygiene score of ≥ 2 were observed during the warmer and rainfall periods. There was no association between hygiene scores and somatic cell counts. The results suggest that pathogens isolated from milk in animals confined in Compost Barn under tropical climate are like other confinement systems adopted elsewhere. The year period influenced the udder hygiene score, reinforcing the importance of bed management throughout the year.


O objetivo deste estudo foi descrever os índices epidemiológicos da mastite, da qualidade do leite e da higiene do úbere em animais confinados no sistema Compost Barn, bem como buscar associações entre patógenos isolados do leite e características do composto. Três rebanhos leiteiros participaram do estudo e as amostras foram coletadas em diferentes períodos em cada fazenda. Amostras individuais de leite foram coletadas em duplicata para análise de CCS e cultura microbiológica. Patógenos ambientais causaram a maioria dos casos de mastite clínica na fazenda 2, e na fazenda 1 a maioria dos casos foi em decorrência de patógenos contagiosos. Amostras de material da cama foram coletadas em duas fazendas para análise da densidade bacteriana e da umidade. A umidade da cama permaneceu dentro da faixa de controle durante o estudo e não foi associada à incidência de patógenos ambientais. A maioria dos animais permaneceu com boa higiene de úbere durante o estudo. A falta de higiene do úbere contribuiu para o aumento da incidência de patógenos ambientais em uma das fazendas. Durante o período mais quente e mais chuvoso, um número maior de animais com escore de sujidade ≥2 foi observado em todos os rebanhos. Não houve associação entre escore de sujidade e contagem de células somáticas em qualquer uma das três fazendas. Os resultados indicam que o perfil de patógenos isolados do leite em animais confinados em Compost Barn sob clima tropical é semelhante a outros sistemas de confinamento adotados em outros lugares. O período do ano influenciou o escore de higiene do úbere, o que reforça a importância do manejo da cama ao longo do ano.


Assuntos
Animais , Feminino , Bovinos , Leite/microbiologia , Criação de Animais Domésticos/métodos , Glândulas Mamárias Animais/microbiologia , Mastite Bovina/epidemiologia , Compostagem
10.
Acta sci. vet. (Impr.) ; 51(supl.1): Pub. 874, 2023. ilus
Artigo em Inglês | VETINDEX | ID: biblio-1434865

Resumo

Background: Osteosarcoma is the most observed primary bone tumor in dogs, and may affect the appendicular and axial skeletons. In addition, it may be present in extraskeletal form, accounting for only 1% of cases. As shown by few reports in the literature, the involvement of the intestinal region by is rare. The objective of this study was to report the case of a 13-year-old Yorkshire dog, submitted to an exploratory laparotomy for suspected partial intestinal obstruction, diagnosed with extraskeletal osteosarcoma. Case: A 13-year-old dog, Yorkshire Terrier, male, presented clinical signs of gastrointestinal abnormalities. An ultrasound examination was performed and was found a mass in small intestine region with wall and lumen invasion. Then, was realized exploratory laparotomy and detected intestinal obstruction due to a mass with approximately 5.0 x 6.0 x 4.4 cm localized in duodenum. Surgical removal was performed and the sample sent to the veterinary diagnostic laboratory for histopathological examination. The sample had an irregular surface and firm consistency. In addition, when cut, the mass enveloped the intestinal layers and sometimes obstructed the lumen. Then, the sample were processed routinely for histopathology. After that, in microscopy evaluation was detected cell proliferation, affecting all layers of intestine. In detail, cells were elongated with pleomorphism marked and atypical mitosis. In addition, there was production of cartilage and bone matrix. So, due the absence of others sites, the neoplasm was considered primary of intestine. After that, to evaluate the expression of KI-67 and COX-2 was performed, and the cell proliferation index was 54.0% and the COX-2 expression was moderate in less than 10% of neoplastic cells. After the surgery, the patient was hospitalized for a week and continue the treatment in home. Afterwards, the tutor received the diagnosis, but even though he was instructed on the severity of the case, he chose not to undergo chemotherapy. After three months, the patient presented abdominal fluid and nodules in your liver, suggesting metastasis, but without diagnosis confirmation. The patient died five months after the diagnosis of extraskeletal osteosarcoma. However, no necropsy was realized, impossibility the diagnosis confirm. Discussion: The frequency of extraskeletal osteosarcoma in dogs remains unknown, with the mammary glands being the most affected site. In the present study, osteosarcoma affects the duodenal region and no reports of this neoplasm in the duodenum of dogs have been found in the literature. The clinical sign of dyschezia was important for the tutor to refer the animal to the veterinarian and perform the ultrasound in an attempt to elucidate the case, as the tumor mass is not always palpable. Histopathological examination and immunohistochemistry were necessary for the differential diagnosis and to establish the prognosis, although after the surgery the tutor chose not to perform chemotherapy. Extraskeletal osteosarcoma are usually highly metastatic, mainly affecting the lymph nodes and liver. In this case, the patient presented a liver nodule three months after the tumor removal surgery, but unfortunately, there was no diagnostic confirmation. Such neoplastic type is rarer and more aggressive than appendicular and axial osteosarcoma, with an average survival of 1 to 3 months. In this case, as a necropsy was not obtained, we cannot attribute the survival time to the disease. The survival rates of osteosarcomas in dogs are few months, but in the present case, although the patient died five months after surgery, the failure to perform a necropsy compromises the attribution of survival time to extraskeletal osteosarcoma.


Assuntos
Animais , Masculino , Cães , Neoplasias Ósseas/veterinária , Osteossarcoma/veterinária , Duodeno/patologia , Imuno-Histoquímica/veterinária
11.
Acta sci. vet. (Impr.) ; 50: Pub.1853-2022. ilus, tab
Artigo em Inglês | VETINDEX | ID: biblio-1458528

Resumo

Background: The tumor microenvironment is an important target of studies in different types of neoplasms. Understanding the role of general components such as immune, vascular and fibroblastic cells has the objective of contributing to prognosis and treatment. The aim of this study was to evaluate the relationship between mast cells and angiogenesis in benign and malignant mammary neoplasms by investigating the role of degranulation and microlocation of mast cells and neoformed vessels in canine mammary neoplasms. Materials, Methods & Results: Mammary glands (n = 122) from 50 female dogs submitted to mastectomy without chemotherapy were evaluated and categorized into 3 groups: control group (n = 46); malignant group (n = 57) and benign group (n = 19). Lymph nodes without changes (n = 59) and with metastases (n = 6) were also evaluated. To evaluate the MCD (mast cell density) and angiogenesis, Toluidine Blue (0.1%) and Gomori’s Trichrome techniques were performed and adapted from previous studies. Photomicrographs of 10 hotspot areas on a 40x objective lens of the mammary glands and lymph nodes were captured to assess MCD and angiogenesis. In the absence of these areas, random fields were captured. For the mammary glands of the malignant and benign groups, 20 fields were analyzed, as the analysis considered the microlocation (peritumoral and intratumoral). Counting was performed manually using ImageJ software version 1.42q by 2 observers. The statistical analysis were performed using SPSS software version 19.0. The most frequent histological type in the malignant group was carcinoma in mixed tumor (68.42%; 39/57) and in the benign group was benign mixed tumor (57.89%; 11/19). Female dogs without breed pattern were more frequently affected represented 70% of the animals and the mean age was 9 years and 8 months ± 3 years and 1 month...


Assuntos
Feminino , Animais , Cães , Mastócitos/patologia , Microambiente Tumoral , Neoplasias Mamárias Animais/patologia , Neoplasias Mamárias Animais/ultraestrutura , Neovascularização Patológica/veterinária
12.
Acta sci. vet. (Online) ; 50: Pub. 1853, Jan. 24, 2022. ilus, tab
Artigo em Inglês | VETINDEX | ID: vti-765298

Resumo

Background: The tumor microenvironment is an important target of studies in different types of neoplasms. Understanding the role of general components such as immune, vascular and fibroblastic cells has the objective of contributing to prognosis and treatment. The aim of this study was to evaluate the relationship between mast cells and angiogenesis in benign and malignant mammary neoplasms by investigating the role of degranulation and microlocation of mast cells and neoformed vessels in canine mammary neoplasms. Materials, Methods & Results: Mammary glands (n = 122) from 50 female dogs submitted to mastectomy without chemotherapy were evaluated and categorized into 3 groups: control group (n = 46); malignant group (n = 57) and benign group (n = 19). Lymph nodes without changes (n = 59) and with metastases (n = 6) were also evaluated. To evaluate the MCD (mast cell density) and angiogenesis, Toluidine Blue (0.1%) and Gomoris Trichrome techniques were performed and adapted from previous studies. Photomicrographs of 10 hotspot areas on a 40x objective lens of the mammary glands and lymph nodes were captured to assess MCD and angiogenesis. In the absence of these areas, random fields were captured. For the mammary glands of the malignant and benign groups, 20 fields were analyzed, as the analysis considered the microlocation (peritumoral and intratumoral). Counting was performed manually using ImageJ software version 1.42q by 2 observers. The statistical analysis were performed using SPSS software version 19.0. The most frequent histological type in the malignant group was carcinoma in mixed tumor (68.42%; 39/57) and in the benign group was benign mixed tumor (57.89%; 11/19). Female dogs without breed pattern were more frequently affected represented 70% of the animals and the mean age was 9 years and 8 months ± 3 years and 1 month...(AU)


Assuntos
Animais , Feminino , Cães , Neoplasias Mamárias Animais/patologia , Neoplasias Mamárias Animais/ultraestrutura , Microambiente Tumoral , Mastócitos/patologia , Neovascularização Patológica/veterinária
13.
Arq. bras. med. vet. zootec. (Online) ; 74(6): 992-998, 2022. ilus, tab
Artigo em Inglês | VETINDEX | ID: biblio-1415389

Resumo

Infrared thermography is a non-invasive diagnostic tool for early detection of subclinical mastitis in pasture-raised dairy cows. The study was conducted on eight dairy farms, in Sena Madureira, Acre, in the Western Amazon, during the rainy season. One hundred and thirteen lactating crossbred cows were monitored, with measurements performed once day before milking, from 02:00 to 06:00 in the morning. The California Mastitis Test (CMT) was subsequently applied. Data processing was performed in the R programming language and evaluated by linear models. Our results show that cow udder surface temperature by infrared thermography showed significant differences (p<0.05) between the months of the year. Cow udder temperatures of thermographic images were significantly different (p<0.05) from CMT results for animals with subclinical mastitis. CMT results showed that 45 cows (39.8%) in January, 52 cows (46%) in February and 57 cows (50.4%) in March had subclinical mastitis. Infrared thermography is a technique that can be used for the early detection of subclinical mastitis in dairy herds in a grazing system, as it detected an increase in the udder surface temperature of the same cows that were positive for CMT.


Avaliou-se a termografia infravermelha como ferramenta diagnóstica, não invasiva, para detecção precoce da mastite subclínica em vacas leiteiras criadas a pasto. O estudo foi conduzido em oito propriedades leiteiras, em Sena Madureira, Acre, na Amazônia Ocidental, durante o inverno amazônico. Foram monitoradas 113 vacas mestiças em lactação, com mensurações realizadas uma vez por dia, sempre antes da realizadas das 2h às 6h da manhã. Em seguida, realizou-se exame de Califórnia Mastitis Test-CMT. O ordenha, processamento dos dados foi feito em linguagem de programação R, os quais foram avaliados por modelos lineares. Os resultados mostram que a temperatura da superfície do úbere das vacas avaliadas com a técnica da termografia infravermelha teve diferenças significativas (P<0,05) entre os meses do ano. Constatou-se alteração na na temperatura do úbere das vacas, captada por meio das imagens termográficas, e foi i significativo (P<0,05) o resultado do teste California Mastistis Test (CMT) para os animais que se encontravam com mastite subclínica. Com base nos resultados do CMT, foi possível constatar que 45 vacas (39,8%) em janeiro, 52 vacas (46%) em fevereiro e 57 vacas (50,4%) em março se encontravam com mastite subclínica. Conclui-se que a termografia infravermelha é uma técnica que pode ser utilizada para a detecção precoce de mastite subclínica em rebanho leiteiro em sistema de pastejo, pois foi capaz de detectar aumento na temperatura superficial do úbere das vacas, que resultaram positivas no teste de CMT.


Assuntos
Animais , Feminino , Bovinos , Temperatura Corporal , Termografia/veterinária , Glândulas Mamárias Animais/patologia , Glândulas Mamárias Animais/diagnóstico por imagem , Mastite Bovina/diagnóstico por imagem
14.
Ciênc. Anim. (Impr.) ; 32(3): 160-171, jul.-set. 2022. ilus, tab
Artigo em Português | VETINDEX | ID: biblio-1402642

Resumo

A anestesia locorregional, em pequenos animais, está em crescente utilização como forma de promover analgesia para procedimentos cirúrgicos, através do bloqueio reversível da condução do impulso nervoso. Assim, o objetivo deste trabalho foi relatar o uso do bloqueio locorregional do plano serrátil (SP block) associado ao bloqueio locorregional do plano transverso do abdômen (TAP block) em uma cadela da raça Lhasa Apso. A associação de tais bloqueios visou à insensibilização da musculatura na região da cadeia mamária para um procedimento cirúrgico de mastectomia unilateral total. A cadela castrada, foi encaminhada para a mastectomia unilateral total direita, apresentando nódulos nas glândulas mamárias torácica caudal e inguinal. Os bloqueios foram realizados com a paciente em decúbito dorsal, utilizando-se bupivacaína a 0,25%. Em seguida, a paciente foi liberada para o procedimento, o qual foi monitorado. Os parâmetros de eletrocardiografia, frequência respiratória, frequência cardíaca, oximetria de pulso, pressão arterial oscilométrica (composta por pressão arterial sistólica, pressão arterial diastólica e pressão arterial média), capnografia e temperatura esofágica foram anotados a cada dez minutos em uma ficha de avaliação anestésica. Durante a recuperação pós-operatória, foi realizada a avaliação de dor aguda por meio da escala de dor da Universidade de Melbourne. Os resultados demonstram que a associação do TAP block com o SP block foi eficiente em promover analgesia para uma mastectomia total unilateral de cadela.


Locoregional anesthesia in small animals is increasingly used as a way to promote analgesia for surgical procedures, through a reversible block of nerve impulse conduction. Thus, the objective of this study was to report the use of locoregional block of the serratus plane (SP block) associated with the locoregional block of the transverse abdominis plane (TAP block) in a bitch of the Lhasa Apso breed. The association of such blocks aimed to desensitize the musculature in the region of the mammary chain for a surgical procedure of total unilateral mastectomy. The castrated bitch was referred for total right unilateral mastectomy, showing nodules in the caudal thoracic and inguinal mammary glands. The blocks were performed with the patient in dorsal decubitus, using 0.25% bupivacaine. Then, the patient was released for the procedure, which was monitored. The parameters of electrocardiography, respiratory rate, heart rate, pulse oximetry, oscillometric blood pressure (composed of systolic blood pressure, diastolic blood pressure, and mean blood pressure), capnography, and esophageal temperature were recorded every 10 minutes in an anesthetic evaluation form. During the postoperative recovery, acute pain was evaluated using the pain scale of the University of Melbourne. The results demonstrate that the association of TAP block with SP block was efficient in promoting analgesia for a total unilateral mastectomy in a bitch.


Assuntos
Animais , Cães , Anestesia Local/veterinária , Glândulas Mamárias Animais/cirurgia , Mastectomia/métodos , Mastectomia/veterinária , Bloqueio Nervoso/métodos
15.
Arq. bras. med. vet. zootec. (Online) ; 74(6): 1039-1048, 2022. ilus, tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1416152

Resumo

Proteiongram analysis is useful for the early diagnosis of intramammary infections during the period of colostrogenesis. This study aimed to evaluate the profile of total proteins, immunoglobulins, lactoferrin, and gamma-glutamyl transferase (GGT) in the colostrum of dairy goats with intramammary infections. Animals were divided in groups: GI (n=12) of goats without mammary gland infections, and GII (n=8) of goats with mammary gland infections. Intramammary infections were diagnosed using microbiological isolations and somatic cell counts Cs). Total protein was evaluated in the samples using SDS-PAGE shortly after parturition, and 24 and 48 hours after that event. Non-aureus Staphylococcus (NAS) were detected all isolates. At 48 h, GII had high IgG levels and a SCC of 1660.25 x 103/mL. Levels of total protein were high in this group at 24 and 48 h. Albumin levels were high in goats with mastitis at 24 h. Overall, the IgG, lactoferrin, and albumin levels differed between animals with and without intramammary infections at M0. GGT activity was not influenced by the intramammary infection. The results of this study reinforce the importance of the proteinogram as an auxiliary tool in the diagnosis of mastitis in dairy goats.


O proteinograma do colostro/leite pode ser útil para diagnóstico precoce de infecções intramamárias, assim como para a avaliação da intensidade da resposta inflamatória. Este estudo teve como objetivo avaliar o perfil de proteínas, imunoglobulinas, lactoferrina e gamaglutamiltransferase no colostro de cabras leiteiras portadoras s de infecções intramamárias. Os animais foram distribuídos em dois grupos, GI (n 12), composto por cabras sem isolamento microbiológico das glândulas mamárias, e GII (n 8), composto por cabras com resultados positivos na cultura do leite de pelo menos uma das glândulas mamárias. O diagnóstico de infecção intramamária foi realizado logo após o parto, por meio de isolamento microbiológico e de contagem de células somáticas (CCS). Os níveis de proteína total, imunoglobulina A (IgA), imunoglobulina (G) (IgG), lactoferrina, albumina e atividade da gamaglutamiltransferase (GGT) foram avaliados em amostras de colostro/leite de transição, usando-se SDS-PAGE logo após o parto bem como às 24 e às 48 horas após esse evento. Staphylococcus não aureus (NAS) foram encontrados em todos os isolamentos. A concentração de IgG de 186 foi superior no GII apenas às 48h, ao mesmo tempo em que o CCS foi de 1660,25 x 10/mL. No entanto, a proteína total foi maior neste grupo às 24 e às 48h. A albumina foi maior nas cabras com mastite às 24h, e a lactoferrina no momento 0h (M0) e às 48h. Em geral, os valores de IgG, lactoferrina e albumina diferiram entre os animais com e sem infecções intramamárias no M0. A atividade da gamaglutamiltransferase não foi influenciada pela infecção intramamária. Os resultados deste estudo reforçam a importância do proteinograma como uma ferramenta auxiliar no diagnóstico da mastite em cabras leiteiras.


Assuntos
Animais , Feminino , Imunoglobulinas/análise , Proteínas de Fase Aguda/análise , Cabras/microbiologia , Colostro/microbiologia , Glândulas Mamárias Animais/patologia
16.
Semina ciênc. agrar ; 43(5): 1891-1906, jun. 2022. tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1395478

Resumo

This study addresses the hypothesis that acute stress can cumulatively cause a decrease in milk yield in Saanen goats. In fact, dairy animals are subject to several environmental and management challenges that may cause acute stress during the same lactation. However, the cumulative effect of acute stress on milk yield remains unclear. Thus, the objective of this study was to evaluate the effects of different acute stressors on milk yield and milk quality in goats. Thirty Saanen goats were either maintained on their usual routine and comfort conditions (control group) or subjected to different environmental stressors (heat stress, adrenocorticotropic hormone [ACTH] administration, hoof care, and rain). These stressful challenges were performed sequentially, one challenge per day, on four consecutive days to evaluate the influence of the challenge on milk yield and milk quality. The acute stress imposed on goats caused significant changes in respiratory rate, rectal temperature, cortisol, insulin, triiodothyronine, insulin-like growth factor 1, and glucose concentrations when compared to the control group. Although these acute-stress-triggered physiological responses are fundamental to restoring homeostasis, the cumulative effects of different imposed challenges caused a change in hormone release, an increase in somatic cell count (SCC), and a decrease in milk yield. In this context, the results of this study indicate that farmers should avoid concurrently subjecting goats to management and environmental challenges that can induce acute stress because these stressors have a negative and cumulative impact on SCC and milk yield.(AU)


Este estudo aborda a hipótese de que o estresse agudo pode causar cumulativamente uma diminuição na produção de leite de cabras Saanen. De fato, os animais leiteiros estão sujeitos a vários desafios ambientais e de manejo que podem causar estresse agudo durante a mesma lactação. No entanto, o efeito cumulativo do estresse agudo na produção de leite ainda não está claro. Assim, o objetivo deste estudo foi avaliar os efeitos de diferentes estressores agudos na produção e qualidade de leite de cabras Saanen. Trinta cabras Saanen foram mantidas em sua rotina habitual e condições de conforto (grupo controle) ou submetidas a diferentes estressores ambientais (estresse por calor, administração de hormônio adrenocorticotrófico [ACTH], cuidados com os cascos e chuva). Esses desafios estressantes foram realizados sequencialmente, um desafio por dia, em quatro dias consecutivos para avaliar a influência do desafio na produção e qualidade do leite. O estresse agudo imposto as cabras causou alterações significativas na frequência respiratória, temperatura retal, cortisol, insulina, triiodotironina, fator de crescimento semelhante à insulina 1 e concentrações de glicose quando comparado ao grupo controle. Embora essas respostas fisiológicas desencadeadas pelo estresse agudo sejam fundamentais para restaurar a homeostase, os efeitos cumulativos de diferentes desafios impostos causaram uma mudança na liberação de hormônios, um aumento na contagem de células somáticas (CCS) e uma diminuição na produção de leite. Neste contexto, os resultados deste estudo indicam que os produtores devem evitar submeter as cabras concomitantemente a desafios de manejo e ambientais que possam induzir estresse agudo, pois esses estressores têm impacto negativo e cumulativo na CCS e na produção de leite.(AU)


Assuntos
Animais , Feminino , Estresse Fisiológico/fisiologia , Cabras/fisiologia , Lactação/fisiologia , Glândulas Mamárias Animais/fisiologia
17.
Ciênc. rural (Online) ; 52(11): e20210505, 2022. tab, graf, ilus
Artigo em Inglês | VETINDEX | ID: biblio-1375134

Resumo

This study evaluated the use of microbiological culture of milk from cows with clinical mastitis (CM), and the performance and economic results after implementing this procedure. The 18-month data were obtained from a farm in Minas Gerais State, Brazil, with an average daily production of 23.1 L of milk from cows milked twice daily under a semi-intensive regime. After a case of CM was identified, a milk sample from the affected quarter was collected and sent to the farm's laboratory. First, a bi-plate containing selective growth medium was used for isolation of Gram-positive and negative bacteria (Plate 1). Subsequently, a tri-plate with selective growth medium was used for isolation of Gram-positive and negative bacteria, and bacteria of the genus Streptococcus (Plate 2). Finally, a tri-plate containing three chromogenic culture media capable of identifying 18 bacterial species was used (Plate 3). Clinical cases of mastitis were treated once a day based on the results of the microbiological culture. Two economic scenarios were evaluated (scenarios 1 and 2). Scenario 1 compared the situation if all cases of CM were treated (not using on-farm culture) vs. the use of on-farm culture (real data) and the generated savings for one year. Data from 1,582 lactations of 1,227 cows were evaluated, with 1,917 cases of CM from 636 cows recorded. The average annual incidence of CM was 48.2%. Of all cases evaluated, 76.8% were classified as grade 1 mastitis; 20% as grade 2, and 3.2% as grade 3. The incidence of new clinical cases of mastitis was 4.17% per month. From the samples analyzed on the three plates, 27.8% of the cases received a recommendation to not be treated and 72.2% received a recommendation of treatment. However, only 18.6% were not treated, making a total of 81.4% treated cases. Of the clinical cases that did not receive intramammary antibiotic therapy, 84.3% had a clinical cure. Conversely, the clinical cure rate reached 84% for the cases that received intramammary antibiotic therapy. In scenario 1, the total operational cost of the clinical case decreased by 10.3% after the implementation of the on-farm culture, with an 18.4% reduction in the use of antibiotics. In scenario 2, there was a 5.5% reduction in the cost of the clinical case and an 11.8% reduction in the use of antibiotics. Thus, the implementation of on-farm culture and the applied methodology, enhanced treatment accuracy of CM cases, reducing the total operating cost of the case and the use of antibiotics on the farm.


O objetivo deste estudo foi avaliar a utilização da cultura microbiológica de leite de vacas com mastite clínica (MC), os resultados zootécnicos e econômicos após implementação desse procedimento. Dados de 18 meses foram obtidos em uma fazenda em Minas Gerais com produção média de 23,1 L de leite/vaca/dia, em duas ordenhas diárias em regime semi-intensivo. Após a identificação da MC, uma amostra de leite do quarto afetado foi coletada e encaminhada para laboratório da fazenda. Primeiramente foi utilizada placa bipartida em meio de cultura seletivo para crescimento de bactérias Gram-positivas e negativas (Placa 1), seguindo-se para a utilização da placa tri-partida com meios de cultura seletivos para crescimento de bactérias Gram-positivas e negativas e bactérias do gênero Streptococcus (Placa 2) e posteriormente para placa tripartida, contendo três meios de cultura cromogênicos, capazes de identificar 18 espécies bacterianas (Placa 3). Foram avaliados dados de 1.227 vacas em 1.582 lactações, sendo registrados 1.917 casos de MC. Os casos clínicos de mastite foram tratados uma vez ao dia com base nos resultados da cultura microbiológica. Foram realizadas duas avaliações financeiras (cenário 1 e 2). O cenário 1 comparou a situação se todos os casos de MC fossem tratados (ausência de cultura na fazenda), comparado com a utilização da cultura na fazenda (dados reais) e as economias de recursos geradas durante o período de um ano. O cenário 2 utilizou os resultados reais após a economia de recursos gerados pela cultura, seguindo a recomendação ideal de tratamento. Foram avaliados 1.917 casos de MC (636 animais), totalizando incidência média anual de 48,2%. Do total dos casos avaliados, 76,8% foram classificados como mastite grau 1; 20% grau 2 e 3,2% grau 3. A incidência de novos casos clínicos de mastite foi de 4,17% ao mês. Das amostras analisadas nas três placas, 27,8% dos casos receberam a recomendação de não serem tratados e 72,2% de tratamento. Entretanto, apenas 18,6% realmente não foram tratados, totalizando 81,4% de tratamentos. Dos casos clínicos que não receberam antibioticoterapia intramamária, 84,3% apresentaram cura clínica. Já os casos que passaram por antibioticoterapia intramamária, a taxa de cura clínica foi de 84,0%. No primeiro cenário, após a implementação da cultura na fazenda, o custo operacional total do caso clínico reduziu em 10,3%, com redução de 18,4% de utilização de antibióticos. Já no segundo cenário, houve redução de 5,5% no custo do caso clínico e redução de 11,8% na utilização de antibióticos. A implementação da cultura na fazenda e a metodologia aplicada, promoveu maior assertividade dos tratamentos dos casos de MC, com redução do custo operacional total do caso e da utilização de antibióticos na propriedade.


Assuntos
Animais , Feminino , Bovinos , Leite/economia , Leite/microbiologia , Glândulas Mamárias Animais/microbiologia , Técnicas Bacteriológicas/veterinária
18.
Acta sci. vet. (Impr.) ; 50(supl.1): Pub. 833, 2022. ilus
Artigo em Inglês | VETINDEX | ID: biblio-1401696

Resumo

Background: Squamous cell carcinoma (SCC) is a common cutaneous neoplasm in horses, which mainly affects the external genitalia, oral cavity, and periocular region. The development of SCC metastases is rare in these animals, and the most common occurrence is a marked local infiltration. Exposure to ultraviolet rays and skin depigmentation are the main etiological factors of SCC. Definitive diagnosis of the neoplasm is performed through histological examination of lesions. The present report describes the clinical, anatomopathological, and immunohistochemical (IHC) aspects of a case of metastatic SCC, with the vulva as the primary site in a mare. Case: A 17-year-old mare, mixed breed, was referred to the Veterinary Hospital of the Universidade de Passo Fundo (UPF), with history of areas of depigmented skin (pinto coat), and clinical history of anorexia, frequent episodes of colic, and recumbency. During clinical evaluation, heart rate (68 bpm), rectal temperature (38.4ºC), and respiratory rate (48 mpm) were elevated, and the oral mucosa was pale. The mare also had an ulcerated tumor mass involving the vulva, which extended to the inguinal region and involved the mammary gland. A cytological aspirate of the vulvar tumor was performed, in which no neoplastic cells were found. Next, a biopsy of 2 distinct areas of the vulva was performed. The material was sent for anatomopathological examination, which showed markedly pleomorphic malignant squamous cells, with individual keratinization and high mitotic index, organized in trabeculae with rare keratin pearl-like formations. The exam allowed the diagnosis of SCC Grade II. Due to the poor prognosis and high cost of treatment, the owner consented to euthanasia and necropsy examination. During necropsy, the vulvar tumor mass was grayish, firm to hard, infiltrative, and had friable areas. Tumor foci suggestive of metastasis were also observed in inguinal, mesenteric, mediastinal and renal lymph nodes, adrenal glands, lung, pericardium, medullary canal, intercostal muscles, right 15th rib, and tissue surrounding the azygos vein. Samples from all organs were collected for anatomopathological examination. Diagnosis of metastatic vulvar SCC was confirmed through histological and IHC studies, which evaluated the expression of cytokeratins (AE1/ AE3), as well as the proliferative activity of neoplastic cells through the PCNA marker. Discussion: The diagnosis of metastatic SCC was obtained through the observed clinical, necroscopic, histological, and IHC characteristics. This neoplasm usually appears in depigmented regions exposed to ultraviolet light, and older animals are more likely to be affected. The mare in the present case had areas of depigmented skin (pinto coat). The animal was kept in a paddock outdoor and exposed to constant solar radiation. Although rare in horses, manifestation of anorexia, progressive weight loss, and frequent colic episodes and recumbency may be closely related to the multiple sites of metastasis in the present case. The main histological findings of the neoplasm were the dense proliferation of malignant squamous cells with individual keratinization, arranged in a trabecular pattern and with rare formations of keratin pearls, in line with previous studies. During IHC evaluation, the neoplastic cells showed expression of cytokeratins (AE1/AE3), as well as high proliferative activity evidenced by the PCNA marker. Given this background, the present report describes the clinical, anatomopathological, and IHC aspects of a case of metastatic SCC with a primary site in the vulva of a mare.


Assuntos
Animais , Feminino , Vulva/patologia , Neoplasias Vulvares/veterinária , Carcinoma de Células Escamosas/veterinária , Cavalos , Metástase Neoplásica , Imuno-Histoquímica/veterinária
19.
Acta sci. vet. (Impr.) ; 49: Pub. 1827, 2021. tab
Artigo em Português | LILACS, VETINDEX | ID: biblio-1363756

Resumo

Mammary tumors (MTs) in bitches are similar to breast cancers in women. Thus, they can be used as a model for human breast cancer and findings can be extrapolated for use in human medicine. BRCA1 is a tumor suppressor gene. When the gene has a mutation, it cannot repair damaged DNA, which causes genetic instability and tumorigenesis. Therefore, we aimed to study the frequency of single nucleotide polymorphisms (SNPs) in the BRCA1 gene that are associated with distinct histological types of malignant MT in bitches. The study population consisted of 91 bitches, including a control group of 6 animals with healthy mammary glands and 85 animals with MTs. All animals underwent a presurgery evaluation consisting of a questionnaire administered to the person responsible for the animal, a physical examination, collection of peripheral blood for hematological and serum biochemistry evaluations, an electrocardiogram, and a preanesthesia evaluation. In addition, distant metastasis was studied via chest radiography and abdominal ultrasound. After evaluations were complete, the animals that could undergo surgery were administered general anesthesia and underwent a mastectomy or mammary gland sample collection. Histopathological examination and molecular analysis were performed to identify mutations in the BRCA1 gene. Histopathological examinations found 10 different types of malignant tumors in 36 sick animals. Tumor samples plus samples from the 6 control animals were subjected to DNA extraction, polymerase chain reaction (PCR) analysis, and genetic sequencing. The tumor with the highest incidence (33.33%) was a complex carcinoma, followed by carcinoma in mixed tumor (13.88), tubular carcinoma (13.88) and carcinosarcoma (13.88). Molecular analysis revealed 3 different SNP points in 5 samples (4006G>A, 3619A>G, and 3761C>T). The allelic variant 4006G>A (1/36) resulted in the alteration of the amino acid valine by isoleucine (V1336 I). The mutation 3619A>G (2/36) inserted the amino acid alanine instead of threonine (T1207 A). The mutation 3761C>T (2/36) led to the alteration of the amino acid serine by phenylalanine (S1254 F), a mutation for which there are no published reports. The histological types that showed BRCA1 mutations were complex carcinoma (1/5), carcinoma in mixed tumor (1/5), papillary carcinoma (1/5) and tubular carcinoma (2/5). Software analysis identified the new SNP (nucleotide 3761) in BRCA1 and 2 point mutations in nucleotides 4006 and 3619 and responsible for genetic instability. The development of breast cancer is caused by many endogenous and exogenous factors. The results of our study show that these factors have a greater presence in female, mixed breed, uncastrated, and older dogs, confirming the data in the veterinary literature. In the present study, we found different histological types of malignant breast tumors with mutations in the BRCA1 gene, as other authors have reported. However, we also found the mutation 3761C>T, which, to the best of our knowledge, has not been reported in the literature. This shows the need for studies in veterinary medicine that assess mutations in the BRCA1 gene and the most common histological types. In conclusion, SNPs in the BRCA1 gene cause genetic instability, resulting in additional mutations that lead to the development of breast tumors. They are point mutations that affect transcription, resulting in truncated proteins. These proteins may have a loss of function, leading to carcinogenesis.(AU)


Assuntos
Animais , Feminino , Cães , Neoplasias Mamárias Animais/genética , Neoplasias Mamárias Animais/diagnóstico por imagem , Genes BRCA1 , Polimorfismo de Nucleotídeo Único/genética , Doenças do Cão/genética , Cães
20.
Rev. bras. zootec ; 50: e20210005, 2021. tab
Artigo em Inglês | VETINDEX | ID: biblio-1443610

Resumo

Records of 3716 Nubian goats from the United States (US) were analyzed to estimate relationships between fourteen conformation traits (CT) with lactation average somatic cell score (ASCS). To analyze ASCS, a mixed model was implemented. Linear and quadratic effects of CT traits, days in milk (DIM), and kidding age in months (KA) were considered as fixed covariates, and herd-year (HY) of kidding as a random effect. Correlation coefficients between CT traits and ASCS adjusted for HY and linear and quadratic KA effects were also obtained. The average ± standard deviations for ASCS, DIM, and milk yield were 5.17±0.54 Log2, equivalent to 451.3 cells × 103/mL, 266.3±52.1 days, and 776.3±280.4 kg per lactation, respectively. Significant non-linear relationships with an intermediate maximum were found between ASCS with teat diameter and medial suspensory ligament, while linear relationships were observed with stature, strength, rump width, fore udder attachment, udder depth, teat diameter, teat placement, and medial suspensory ligament. The model explained 53.7% of the ASCS variability, but the contribution of each type variable to increase the coefficient of determination was low (<0.52%). Herd-year explained a large proportion of the variation of ASCS (38.4%). All estimated correlations between CT and ASCS had low values, from −0.04 to 0.11, but most were significant. The results of this study show that conformation traits have few opportunities to contribute phenotypically to assess somatic cell score in Nubian goats.


Assuntos
Animais , Feminino , Cabras/microbiologia , Glândulas Mamárias Animais/microbiologia , Células Produtoras de Anticorpos , Modelos Estatísticos
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