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1.
Braz J Biol ; 84: e278851, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38865566

RESUMEN

The betta (Betta splendens) is a carnivorous ornamental species that requires live food. In this study, we evaluated the growth and survival of Betta splendens fingerlings fed ex-situ biofloc (BFT). A total of 375 fingerlings (8.3 ± 4.1 mg and 0.8 ± 0.14 cm) were distributed into 15-L plastic tanks (n=25), with five replicates for each of the following treatments: (i) exclusive live food (LF100), (ii) exclusive biofloc (BFT100), (iii) live food supplemented with biofloc (LF100-BFT100), and a reduction of 15% (iv) and 30% (v) in live food with biofloc supplementation (LF85-BFT100 and LF70-BFT100, respectively). The fish were fed newly hatched brine shrimp (Artemia spp. nauplii) and/or fresh biofloc, twice daily, over a 16-day experimental period. Dietary supplementation of Beta splendens with ex-situ BFT (LF100-BFT100, LF85-BFT100, and LF70-BFT100) resulted in a similar final weight (P>0.05) compared to exclusive brine shrimp (LF100). Regarding total length, the fish in the LF100-BFT100 group were superior to those in the LF100 group (P<0.05). The LF100 and LF100-BFT100 groups showed survival rates of 100% and 98.4%, respectively, which were not statistically different (P>0.05). For all analyzed variables, fish exclusively fed biofloc (BFT100) exhibited unfavorable performance. These results indicate that dietary ex-situ biofloc supplementation, without reducing the supply of live food, can be an interesting alternative in the rearing of Betta splendens since biofloc improves growth performance and maintains a good survival rate.


Asunto(s)
Alimentación Animal , Animales , Acuicultura/métodos , Artemia
2.
Braz J Biol ; 83: e275678, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-38126637

RESUMEN

The objective of this study was to evaluate reproductive traits in adults of Astyanax lacustris subjected to different spawning inducers. The study involved 240 females (12.54 g ± 2.33 and 7.66 cm ± 0.63 cm) and 240 males (5.83 g ± 0.39 g and 6.14 cm ± 0.64 cm), all at reproductive age. Three different inducers were evaluated: (i) 0.4 pellets of Ovopel®/kg of body weight; (ii) 0.5 ml of buserelin acetate/kg of body weight; and (iii) carp pituitary extract (CPE) (5.5 mg CPE/kg body weight for females and 2.5 mg CPE/kg body weight for males), as well as saline solution (without hormone). The degree-hours for spawning were greater (P<0.05) for the Ovopel® treatment (with 204.93) than in the treatment with CPE (183.2). Ovary weight and gonadosomatic index were higher (P<0.05) in CPE and Ovopel® treatments when compared to buserelin acetate. The number of oocytes per female, absolute and relative fecundity were greater (P<0.05) for Ovopel® and CPE treatments. Fertilization rate was higher (P<0.05) in treatment with buserelin acetate (82.3%) in relation to Ovopel® (72.33%) and CPE (62.40%) treatments, and the highest (P<0.05) hatching rates were achieved with buserelin acetate and Ovopel®. The number of larvae per female body weight was greater (P<0.05) when Ovopel® was used. In conclusion, Ovopel® proves to be a more effective reproductive inducer for induced reproduction of A. lacustris when compared to CPE and buserelin acetate.


Asunto(s)
Carpas , Characidae , Masculino , Animales , Femenino , Buserelina/farmacología , Reproducción , Peso Corporal
3.
AJNR Am J Neuroradiol ; 44(10): 1201-1207, 2023 10.
Artículo en Inglés | MEDLINE | ID: mdl-37591769

RESUMEN

BACKGROUND AND PURPOSE: Although cardinal imaging features for the diagnostic criteria of the Dandy-Walker phenotype have been recently defined, there is a large range of unreported malformations among these patients. The brainstem, in particular, deserves careful attention because malformations in this region have potentially important implications for clinical outcomes. In this article, we offer detailed information on the association of brainstem dysgenesis in a large, multicentric cohort of patients with the Dandy-Walker phenotype, defining different subtypes of involvement and their potential clinical impact. MATERIALS AND METHODS: In this established multicenter cohort of 329 patients with the Dandy-Walker phenotype, we include and retrospectively review the MR imaging studies and clinical records of 73 subjects with additional brainstem malformations. Detailed evaluation of the different patterns of brainstem involvement and their potential clinical implications, along with comparisons between posterior fossa measurements for the diagnosis of the Dandy-Walker phenotype, was performed among the different subgroups of patients with brainstem involvement. RESULTS: There were 2 major forms of brainstem involvement in patients with Dandy-Walker phenotype including the following: 1) the mild form with anteroposterior disproportions of the brainstem structures "only" (57/73; 78%), most frequently with pontine hypoplasia (44/57; 77%), and 2) the severe form with patients with tegmental dysplasia with folding, bumps, and/or clefts (16/73; 22%). Patients with severe forms of brainstem malformation had significantly increased rates of massive ventriculomegaly, additional malformations involving the corpus callosum and gray matter, and interhemispheric cysts. Clinically, patients with the severe form had significantly increased rates of bulbar dysfunction, seizures, and mortality. CONCLUSIONS: Additional brainstem malformations in patients with the Dandy-Walker phenotype can be divided into 2 major subgroups: mild and severe. The severe form, though less prevalent, has characteristic imaging features, including tegmental folding, bumps, and clefts, and is directly associated with a more severe clinical presentation and increased mortality.


Asunto(s)
Síndrome de Dandy-Walker , Hidrocefalia , Malformaciones del Sistema Nervioso , Humanos , Síndrome de Dandy-Walker/diagnóstico por imagen , Estudios Retrospectivos , Tronco Encefálico/diagnóstico por imagen , Pronóstico
4.
Arch. Soc. Esp. Oftalmol ; 98(8): 473-477, ago. 2023. ilus
Artículo en Español | IBECS | ID: ibc-223932

RESUMEN

El diagnóstico de retinopatía aguda zonal oculta externa (AZOOR) se presenta como un desafío en la práctica del oftalmólogo. En esta enfermedad fueron descritos varios hallazgos atípicos, pero el edema del disco óptico es raro. Pretendemos describir un diagnóstico desafiador de AZOOR. Presentamos el caso de una mujer de 19 años con pérdida de visión del ojo derecho, sin dolor, con 2 semanas de evolución. El fondo de ojo presentaba edema con hiperemia del disco óptico y la campimetría demostraba una mancha ciega aumentada. Se ha considerado como diagnóstico neuritis óptica, sin causa infecciosa, por lo que ha realizado tratamiento con corticoide. Después de 4 meses, la agudeza visual había mejorado, pero persistían las alteraciones en la campimetría con hiperautofluorescencia alrededor del disco óptico. La tomografía óptica de coherencia demostró pérdida generalizada de las capas externas de la retina y disminución de la reflectancia de la región correspondiente. Se concluye que el edema de la papila no es un hallazgo frecuente de AZOOR, por lo que representa una enfermedad de difícil diagnóstico (AU)


Acute zonal occult outer retinopathy (AZOOR) diagnosis is challenging and frequently delayed. Atypical findings were described, nevertheless optic disc edema has not been consistently reported. In this study we pretend to describe a challenging diagnosis of AZOOR. In our case, a 19-year-old female presented painless vision loss in her right eye for 2 weeks. Fundus examination revealed optic disc hyperaemic edema and the visual field (VF) an enlarged blind spot. Non-infectious optic neuritis was assumed and intravenous corticotherapy administered. Four months later, VA had improved, but a VF defect persisted. Funduscopic examination showed mild peripapillary atrophy and autofluorescence zonal hyperautofluorescence around optic disc. Optical coherence tomography demonstrated diffuse loss of outer retinal layers and electroretinogram weakened signal at the corresponding region. In conclusion, unilateral optic disc edema, generally not associated with AZOOR typical presentation, hamper an early diagnosis and expresses this case relevance (AU)


Asunto(s)
Humanos , Femenino , Adulto Joven , Enfermedades de la Retina/diagnóstico por imagen , Neuritis Óptica/diagnóstico por imagen , Papiledema/diagnóstico por imagen , Tomografía de Coherencia Óptica , Errores Diagnósticos , Enfermedad Aguda
5.
Arch Soc Esp Oftalmol (Engl Ed) ; 98(8): 473-477, 2023 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-37247666

RESUMEN

Acute zonal occult outer retinopathy (AZOOR) diagnosis is challenging and frequently delayed. Atypical findings were described, nevertheless optic disc edema has not been consistently reported. In this study we pretend to describe a challenging diagnosis of AZOOR. In our case, a 19-year-old female presented painless vision loss in her right eye for 2 weeks. Fundus examination revealed optic disc hyperaemic edema and the visual field (VF) an enlarged blind spot. Non-infectious optic neuritis was assumed and intravenous corticotherapy administered. Four months later, VA had improved, but a VF defect persisted. Funduscopic examination showed mild peripapillary atrophy and autofluorescence zonal hyperautofluorescence around optic disc. Optical coherence tomography demonstrated diffuse loss of outer retinal layers and electroretinogram weakened signal at the corresponding region. In conclusion, unilateral optic disc edema, generally not associated with AZOOR typical presentation, hamper an early diagnosis and expresses this case relevance.


Asunto(s)
Papiledema , Síndromes de Puntos Blancos , Femenino , Humanos , Adulto Joven , Adulto , Papiledema/complicaciones , Escotoma/diagnóstico , Escotoma/etiología , Síndromes de Puntos Blancos/complicaciones , Trastornos de la Visión/diagnóstico , Edema
6.
AJNR Am J Neuroradiol ; 43(10): 1544-1547, 2022 10.
Artículo en Inglés | MEDLINE | ID: mdl-36137659

RESUMEN

We describe a technique termed "resisted inspiration" that could be used during myelography to decrease superior vena cava venous pressure and increase lumbar CSF pressure, potentially aiding in the detection of CSF-venous fistulas.


Asunto(s)
Fístula , Vena Cava Superior , Humanos , Mielografía/métodos
8.
AJNR Am J Neuroradiol ; 42(5): 961-968, 2021 05.
Artículo en Inglés | MEDLINE | ID: mdl-33664107

RESUMEN

BACKGROUND AND PURPOSE: Primary posterior fossa tumors comprise a large group of neoplasias with variable aggressiveness and short and long-term outcomes. This study aimed to validate the clinical usefulness of a radiologic decision flow chart based on previously published neuroradiologic knowledge for the diagnosis of posterior fossa tumors in children. MATERIALS AND METHODS: A retrospective study was conducted (from January 2013 to October 2019) at 2 pediatric referral centers, Children's Hospital of Philadelphia, United States, and Great Ormond Street Hospital, United Kingdom. Inclusion criteria were younger than 18 years of age and histologically and molecularly confirmed posterior fossa tumors. Subjects with no available preoperative MR imaging and tumors located primarily in the brain stem were excluded. Imaging characteristics of the tumors were evaluated following a predesigned, step-by-step flow chart. Agreement between readers was tested with the Cohen κ, and each diagnosis was analyzed for accuracy. RESULTS: A total of 148 cases were included, with a median age of 3.4 years (interquartile range, 2.1-6.1 years), and a male/female ratio of 1.24. The predesigned flow chart facilitated identification of pilocytic astrocytoma, ependymoma, and medulloblastoma sonic hedgehog tumors with high sensitivity and specificity. On the basis of the results, the flow chart was adjusted so that it would also be able to better discriminate atypical teratoid/rhabdoid tumors and medulloblastoma groups 3 or 4 (sensitivity = 75%-79%; specificity = 92%-99%). Moreover, our adjusted flow chart was useful in ruling out ependymoma, pilocytic astrocytomas, and medulloblastoma sonic hedgehog tumors. CONCLUSIONS: The modified flow chart offers a structured tool to aid in the adjunct diagnosis of pediatric posterior fossa tumors. Our results also establish a useful starting point for prospective clinical studies and for the development of automated algorithms, which may provide precise and adequate diagnostic tools for these tumors in clinical practice.


Asunto(s)
Algoritmos , Neoplasias Infratentoriales/diagnóstico , Imagen por Resonancia Magnética/métodos , Adolescente , Niño , Preescolar , Femenino , Humanos , Lactante , Neoplasias Infratentoriales/patología , Masculino
9.
AJNR Am J Neuroradiol ; 42(2): 389-396, 2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-33384291

RESUMEN

BACKGROUND AND PURPOSE: Little is known about imaging features of spinal cord lesions in mitochondrial disorders. The aim of this research was to assess the frequency, imaging features, and pathogenic variants causing primary mitochondrial disease in children with spinal cord lesions. MATERIALS AND METHODS: This retrospective analysis included patients seen at Children's Hospital of Philadelphia between 2000 and 2019 who had a confirmed diagnosis of a primary (genetic-based) mitochondrial disease and available MR imaging of the spine. The MR imaging included at least both sagittal and axial fast spin-echo T2-weighted images. Spine images were independently reviewed by 2 neuroradiologists. Location and imaging features of spinal cord lesions were correlated and tested using the Fisher exact test. RESULTS: Of 119 children with primary mitochondrial disease in whom MR imaging was available, only 33 of 119 (28%) had available spine imaging for reanalysis. Nineteen of these 33 individuals (58%) had evidence of spinal cord lesions. Two main patterns of spinal cord lesions were identified: group A (12/19; 63%) had white ± gray matter involvement, and group B (7/19; 37%) had isolated gray matter involvement. Group A spinal cord lesions were similar to those seen in patients with neuromyelitis optica spectrum disorder, multiple sclerosis, anti-myelin oligodendrocyte glycoprotein-IgG antibody disease, and leukoencephalopathy with brain stem and spinal cord involvement and lactate elevation. Group B patients had spinal cord findings similar to those that occur with ischemia and viral infections. Significant associations were seen between the pattern of lesions (group A versus group B) and the location of lesions in cervical versus thoracolumbar segments, respectively (P < .01). CONCLUSIONS: Spinal cord lesions are frequently observed in children with primary mitochondrial disease and may mimic more common causes such as demyelination and ischemia.


Asunto(s)
Enfermedades Mitocondriales/patología , Neuroimagen/métodos , Médula Espinal/diagnóstico por imagen , Médula Espinal/patología , Niño , Preescolar , Diagnóstico Diferencial , Femenino , Humanos , Lactante , Inflamación/diagnóstico , Inflamación/patología , Isquemia/diagnóstico , Isquemia/patología , Imagen por Resonancia Magnética/métodos , Masculino , Estudios Retrospectivos , Enfermedades de la Médula Espinal/diagnóstico , Enfermedades de la Médula Espinal/etiología , Enfermedades de la Médula Espinal/patología
10.
BJOG ; 128(2): 317-326, 2021 01.
Artículo en Inglés | MEDLINE | ID: mdl-32920998

RESUMEN

OBJECTIVE: To define the prevalence of adverse outcomes of maternal infection in a large cohort of ZIKV-infected Brazilian women and their infants. DESIGN: Prospective population-based cohort study. SETTING: Ribeirão Preto's region's private and public health facilities. POPULATION: Symptomatic ZIKV-infected mothers and their infants. METHODS: Prenatal/early neonatal data were obtained for all mother-child pairs. A subgroup of infants had cranial ultrasonography, eye fundoscopy, hearing and neurological examinations and Bayley III screening tests within 3 months of age. MAIN OUTCOME MEASURES: Prevalence of pregnancy losses and anomalies detected at birth or within 3 months according to the gestational age of infection. RESULTS: Overall, 511 ZIKV-infected women were identified from a total of 1116 symptomatic women; as there were two twins, there were a total of 513 fetuses included. Of these, 13 (2.5%; 95% CI 1.5-4.3) presented with major signs of congenital Zika syndrome (CZS). Of the 511 women, there were 489 livebirths and 24 (4.7%) pregnancy losses (20 miscarriages and four stillbirths). ZIKV-related anomalies occurred in the offspring of 42/511 (8.2%) mothers. Microcephaly or other CNS malformations were diagnosed in 1/4 (25.0%) stillbirths and in 19/489 (3.9%; 95% CI 2.5-5.9) of the liveborn infants. Fetal abnormalities were 14.0 (95% CI 7.6-26.0) times more likely with gestational infection occurring in ≤11 weeks. On follow up of 280 asymptomatic infants, 2/155 (1.3%) had eye abnormalities, 1/207 (0.5%) had CNS imaging findings and 16/199 (8%) presented neurological alert signs. CONCLUSIONS: This prospective population-based study represents the largest Brazilian cohort study of ZIKV in pregnancy. Congenital anomalies potentially associated with CZS are less frequent than previously thought. There is a strong association between the gestational age of infection (≤11 weeks) and a poorer early infant prognosis. A notable proportion of apparently asymptomatic newborns can present with subclinical findings within 3 months of age. TWEETABLE ABSTRACT: ZIKV and pregnancy: adverse outcomes are less common, more prevalent for first-trimester infections, and potentially subclinical.


Asunto(s)
Malformaciones del Sistema Nervioso/epidemiología , Complicaciones Infecciosas del Embarazo/virología , Infección por el Virus Zika/complicaciones , Adulto , Brasil , Estudios de Cohortes , Femenino , Edad Gestacional , Humanos , Recién Nacido , Masculino , Embarazo , Complicaciones Infecciosas del Embarazo/diagnóstico , Resultado del Embarazo , Prevalencia , Factores de Riesgo , Infección por el Virus Zika/diagnóstico
11.
Plant Biol (Stuttg) ; 23(2): 259-266, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33222376

RESUMEN

Oncidiinae is one of the most important subtribes among the Neotropical orchids, with an enormous diversity of floral morphology and secretory structures. This subtribe attracts a diverse array of pollinators which explore a variety of floral resources of its flowers. In this paper we provide a detailed investigation of the floral anatomy of 32 species of micro Oncidiinae. We applied histochemical tests in order to determine the diversity of the glands and rewards. The diversity of secretory flower structures and rewards was related to the group of pollinators known for this subtribe. We verified that half of the species (16 species, 50%) secrete oil as a resource, being pollinated by female of solitary bees. Species of some distinct nectar-secreting genera (four species, 12.5%) are pollinated by a range of nectar-searching animals. Species of the genus Notylia (four species, 12.5%) release floral perfumes that reward male Euglossini bees. Most of the investigated species (six species, 18.75%) possess osmophores that are involved in pollinator attraction. Two species of Capanemia (6.25%) do not offer any floral reward, suggesting that pollination by food deception is involved. There are strong variations in the anatomy of reward-producing structures and resources in Oncidiinae. The diversity of floral rewards affects the range of pollinators, which are related to the diversification of this subtribe throughout the Neotropics. The understanding of relationships between Oncidiinae species and their pollinators is crucial to our knowledge of the evolution of pollination systems in this huge plant family represented by the orchids.


Asunto(s)
Abejas , Flores , Orchidaceae , Polinización , Animales , Femenino , Flores/anatomía & histología , Interacciones Huésped-Parásitos/fisiología , Masculino , Orchidaceae/anatomía & histología , Orchidaceae/fisiología , Perfumes , Néctar de las Plantas , Aceites de Plantas , Especificidad de la Especie
14.
Int J Biol Macromol ; 164: 616-625, 2020 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-32698062

RESUMEN

Viruses are associated with several human diseases that infect a large number of individuals, hence directly affecting global health and economy. Owing to the lack of efficient vaccines, antiviral therapy and emerging resistance strains, many viruses are considered as a potential threat to public health. Therefore, researches have been developed to identify new drug candidates for future treatments. Among them, antiviral research based on natural molecules is a promising approach. Phospholipases A2 (PLA2s) isolated from snake venom have shown significant antiviral activity against some viruses such as Dengue virus, Human Immunodeficiency virus, Hepatitis C virus and Yellow fever virus, and have emerged as an attractive alternative strategy for the development of novel antiviral therapy. Thus, this review provides an overview of remarkable findings involving PLA2s from snake venom that possess antiviral activity, and discusses the mechanisms of action mediated by PLA2s against different stages of virus replication cycle. Additionally, molecular docking simulations were performed by interacting between phospholipids from Dengue virus envelope and PLA2s from Bothrops asper snake venom. Studies on snake venom PLA2s highlight the potential use of these proteins for the development of broad-spectrum antiviral drugs.


Asunto(s)
Antivirales/farmacología , Fosfolipasas A2/farmacología , Venenos de Serpiente/enzimología , Serpientes/metabolismo , Animales , Virus del Dengue/efectos de los fármacos , Farmacorresistencia Viral/efectos de los fármacos , VIH/efectos de los fármacos , Hepacivirus/efectos de los fármacos , Simulación del Acoplamiento Molecular , Proteínas de Reptiles/farmacología , Virus de la Fiebre Amarilla/efectos de los fármacos
15.
AJNR Am J Neuroradiol ; 41(5): 917-922, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-32381541

RESUMEN

Pathogenic variants in the polymerase γ gene (POLG) cause a diverse group of pathologies known as POLG-related disorders. In this report, we describe brain MR imaging findings and electroencephalogram correlates of 13 children with POLG-related disorders at diagnosis and follow-up. At diagnosis, all patients had seizures and 12 had abnormal MR imaging findings. The most common imaging findings were unilateral or bilateral perirolandic (54%) and unilateral or bilateral thalamic signal changes (77%). Association of epilepsia partialis continua with perirolandic and thalamic signal changes was present in 86% and 70% of the patients, respectively. The occipital lobe was affected in 2 patients. On follow-up, 92% of the patients had disease progression or fatal outcome. Rapid volume loss was seen in 77% of the patients. The occipital lobe (61%) and thalamus (61%) were the most affected brain regions. Perirolandic signal changes and seizures may represent a brain imaging biomarker of early-onset pediatric POLG-related disorders.


Asunto(s)
Encéfalo/diagnóstico por imagen , Enfermedades Mitocondriales/diagnóstico por imagen , Neuroimagen/métodos , Convulsiones/diagnóstico por imagen , Convulsiones/genética , Encéfalo/patología , Niño , Preescolar , ADN Polimerasa gamma/genética , Electroencefalografía , Femenino , Humanos , Imagen por Resonancia Magnética , Masculino , Enfermedades Mitocondriales/genética , Enfermedades Mitocondriales/patología , Estudios Retrospectivos , Convulsiones/patología
16.
Rev Neurol ; 70(2): 73-74, 2020 Jan 16.
Artículo en Español | MEDLINE | ID: mdl-31930474

RESUMEN

TITLE: Asociación genotipo-fenotipo en un niño con neurofibromatosis tipo 1.


Asunto(s)
Estudios de Asociación Genética , Neurofibromatosis 1/genética , Niño , Humanos , Masculino
17.
Plant Biol (Stuttg) ; 21(6): 1016-1023, 2019 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-31237057

RESUMEN

The presence of glandular appendages in the anthers is a rare condition in angiosperms. In Leguminosae it occurs in species of the Mimosoid clade and in early-branching clades of papilionoids such as Dipterygeae. In Dipterygeae such appendages surprisingly exhibit a secretory cavity instead of secretory emergences as is the case for the Mimosoid clade. Thus, the objective of this study was to elucidate the function of anther glands in Dipteryx alata and Pterodon pubescens, species in the Dipterygeae clade that exhibit a pollen release mechanism that is intermediate between the explosive and valvular types. Flower buds and flowers were processed for surface, anatomical, histochemical and ultrastructural analyses. Anther glands consist of a cavity secreting sticky substances (oleoresins and polysaccharides) that play a key role during the flower's lifespan by aggregating pollen grains and attaching them to the floral visitor's body. Other floral features that are important for understanding the pollen release mechanism that is intermediate between the valvular and the explosive types are: (i) keel petals intertwined with tector trichomes; (ii) glandular appendages in the abaxial and lateral sepals and in petals composed of secretory ducts; and (iii) a continuous secretion process of the anther glands followed by an asynchronous dehiscence of anthers. The well-adapted papilionoid flag blossom with anther glands and keel petals intertwined with trichomes provided the foundation for a successful canalisation toward a pollen release mechanism intermediate between the explosive and valvular types inside early-branching papilionoids.


Asunto(s)
Fabaceae/fisiología , Flores/fisiología , Polinización/fisiología , Dipteryx/metabolismo , Dipteryx/fisiología , Fabaceae/metabolismo , Flores/metabolismo , Extractos Vegetales/metabolismo , Polisacáridos/metabolismo
18.
Biosens Bioelectron ; 141: 111386, 2019 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-31220725

RESUMEN

DNA methylation and histone deacetylation are key epigenetic processes involved in normal cellular function and tumorigenesis. Therapeutic strategies based on DNA methyltransferase (DNMT) and histone deacetylase (HDAC) inhibitors are currently in use and under development for the treatment of cancers. Genome-wide DNA methylation profiling has been proposed for use in disease diagnosis, and histone modification profiling for disease stratification will follow suit. However, whether epigenome sequencing technologies will be feasible for rapid clinic diagnosis and patient treatment monitoring remains to be seen, and alternative detection technologies will almost certainly be needed. Here we used electrochemical impedance spectroscopy (EIS) employing a graphene-based screen-printed electrode system to directly measure global DNA methylation and histone H3 acetylation to compare non-cancer and breast cancer cell lines. We demonstrated that whilst global methylation was not useful as a differential marker in the cellular systems tested, histone H3 acetylation was effective at higher chromatin levels. Using breast and endometrial cancer cell models, EIS was then used to monitor cellular responses to the DNMT and HDAC inhibitors 5-Aza-2'-deoxycytidine and suberoylanilide hydroxamic acid in vitro, and proved very effective at detecting global cellular responses to either treatment, indicating that this approach could be useful in following treatment response to epigenetic drugs. Moreover, this work reports the first combined analysis of two epigenetic markers using a unified graphene-based biosensor platform, demonstrating the potential for multiplex analysis of both methylation and acetylation on the same sample.


Asunto(s)
Antineoplásicos/farmacología , Neoplasias de la Mama/tratamiento farmacológico , Metilasas de Modificación del ADN/antagonistas & inhibidores , Neoplasias Endometriales/tratamiento farmacológico , Epigénesis Genética/efectos de los fármacos , Inhibidores de Histona Desacetilasas/farmacología , Técnicas Biosensibles/métodos , Neoplasias de la Mama/genética , Línea Celular Tumoral , Metilación de ADN/efectos de los fármacos , Metilasas de Modificación del ADN/metabolismo , Espectroscopía Dieléctrica/métodos , Ensayos de Selección de Medicamentos Antitumorales/métodos , Neoplasias Endometriales/genética , Femenino , Humanos
19.
Rev Neurol (Paris) ; 175(6): 367-376, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-30922589

RESUMEN

Several studies have demonstrated that stroke subjects present impairment of functions related to decision-making and timing, involving the information processing in the neural circuits of the cerebellum in association with the prefrontal cortex. This review is aimed to identify the gaps, and demonstrate a better understanding of decision-making and timing functions in the patients with stroke. Electronic literature database was searched and the findings of relevant studies were used to explore the mechanisms of decision-making and timing in patients with stroke, as well as the circuit connections in timing mediated by prefrontal cortex and cerebellum. A literature review was conducted with 65 studies that synthesized findings on decision-making and time perception in individuals with stroke. Types of neurobiological modalities in this study included: Relationships among decision-making, time perception, related cognitive aspects (such as discrimination tasks, verbal estimation, bisection tasks, time production and motor reproduction), and motor control. We demonstrate that the timing processes are important for the performance in cognitive tasks and that the cerebellum and prefrontal cortex are involved in decision-making and time perception. In the context, the decision-making is impaired in stroke patients has a great impact on executive functions, and this seems to be important in determining neurobiological aspects relevant to the time interval interpretation.


Asunto(s)
Conducta/fisiología , Trastornos del Conocimiento/etiología , Toma de Decisiones/fisiología , Vías Nerviosas/fisiología , Accidente Cerebrovascular/complicaciones , Percepción del Tiempo/fisiología , Cerebelo/patología , Cerebelo/fisiología , Cognición/fisiología , Trastornos del Conocimiento/fisiopatología , Trastornos del Conocimiento/psicología , Humanos , Corteza Prefrontal/patología , Corteza Prefrontal/fisiología , Accidente Cerebrovascular/fisiopatología , Accidente Cerebrovascular/psicología
20.
Arq. bras. med. vet. zootec. (Online) ; 71(1): 143-150, jan.-fev. 2019. tab, graf
Artículo en Inglés | LILACS, VETINDEX | ID: biblio-989356

RESUMEN

The aim of this study was to relate the serum concentration IL-6, IGF-1, leptin and estrogen in non-castrated bitches with or without overweight and early stage mammary carcinomas. Forty-three bitches were divided into four groups, two groups without mammary carcinomas with and without overweight, and two groups with mammary carcinomas with and without overweight. Overweight bitches, with or without mammary carcinomas, were statistically different from bitches by ideal weight, in relation to ECC, IMCC and body fat percentages (P< 0.0001). There was a positive correlation between ECC and IMCC (P< 0.0001), ECC and % GC (P< 0.0001), and IMCC and % GC (P< 0.0001). A positive correlation was found between serum leptin and IL-6 (P= 0.0451) and leptin and IGF-1 (P= 0.05). A positive correlation (P= 0.0053) between ECC and leptin was found in the analysis of body evaluation methods and serum concentrations, and a negative correlation between ECC and IL-6 (P= 0.0435). Among the fat percentage and the leptin concentration, there was a positive correlation (P= 0.0016), as found between the IMCC and leptin (P= 0, 0209). In this study, no association was observed between excessive weight and the presence of early stage mammary carcinomas.(AU)


Este estudo teve por objetivo relacionar a concentração sérica de IL-6, IGF-1, leptina e estrógeno, em cadelas não castradas com ou sem excesso de peso, e carcinomas mamários em estágio inicial. Quarenta e três cadelas foram divididas em quatro grupos, sendo dois de cadelas sem carcinomas mamários, com e sem excesso de peso, e dois de cadelas com carcinomas mamários, com e sem excesso de peso. Cadelas com excesso de peso, com ou sem carcinomas mamários, foram estatisticamente diferentes de cadelas em peso ideal, em relação às avaliações corporais de ECC, IMCC e percentual de gordura corpórea (P<0,0001). Foi observada uma correlação positiva entre ECC e IMCC (P<0,0001), ECC e %GC (P<0,0001), e IMCC e %GC (P<0,0001). As análises de estrógeno, leptina, IL-6 e IGF-1 não apresentaram diferenças estatísticas entre os grupos. Demonstrou-se correlação positiva entre as concentrações séricas de leptina e IL-6 (P=0,0451) e leptina e IGF-1 (P=0,05). Encontrou-se correlação positiva entre ECC e leptina (P=0,0053) e negativa entre ECC e IL-6 (P=0,0435). Entre o percentual de gordura e leptina encontrou-se correlação positiva (P=0,0016), assim como entre IMCC e leptina (P=0,0209). Neste estudo, não se observou associação entre excesso de peso e a presença de carcinomas mamários em estadio inicial.(AU)


Asunto(s)
Animales , Femenino , Perros , Neoplasias Mamarias Animales/diagnóstico , Leptina/análisis , Perros/metabolismo , Sobrepeso/veterinaria , Factor I del Crecimiento Similar a la Insulina , Interleucina-6
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