Análise ultraestrutural do colágeno de feridas cutâneas de coelhos tratadas com plasma rico em plaquetas de equino / Ultrastructural analysis of the collagen of rabbit skin wounds treated with platelet-rich equine plasma

O colágeno é sintetizado e segregado no espaço extracelular e organizados em fibrilas estriadas de acordo com o tipo de tecido. Utilizaram-se 24 coelhos brancos da raça Nova Zelândia, com idade de 12 meses e com 3,0kg de peso corporal, para avaliar a porcentagem de colágeno das feridas cutâneas tratadas com plasma rico em plaquetas de equino e pomada contendo gentamicina, sulfanilamida, sulfadiazina, ureia e vitamina A. Os animais foram separados em quatro grupos de igual número e submetidos à remoção de pele na região das linhas médias dorsal torácica (feridas tratadas) e lombar (feridas controle). As feridas torácicas foram tratadas com plasma rico em plaqueta de equino e pomada contendo gentamicina, sulfanilamida, sulfadiazina, ureia e vitamina A, e as do grupo controle somente com a pomada. Dos animais do grupo I, foi coletado tecido cutâneo, para a avaliação histológica e a ultraestrutural, com três dias de pós-operatório; dos animais do grupo II, com sete dias; do grupo III, com 14 dias; e do grupo IV, com 21 dias. Decorrido o período de avaliação de cada grupo, foi coletado fragmento de pele para avaliação da porcentagem de colágeno, bem como do diâmetro e da densidade da fibrila de colágeno por microscopia eletrônica de transmissão. O tratamento com PRP de equino associado à aplicação tópica da pomada mostrou-se eficaz na maturação das fibrilas colágenas e na antecipação do processo cicatricial.(AU)

Collagen is synthesized and secreted into the extracellular space and organized into striated fibrils according to the tissue type. This study evaluated the concentration of collagen in rabbit skin wounds treated with equine platelet-rich plasma (PRP) and ointment containing gentamicin, sulfanilamide, sulfadiazine, urea, and vitamin A. Twenty-four New Zealand white rabbits aged 2 to 12 months and weighing 3.0kg were included. The animals were allocated equally into four groups and the skin was removed from the thoracic dorsal midline (treated wound) and lumbar (control wound) regions. The thoracic wounds were treated with equine PRP and ointment containing gentamicin, sulfanilamide, sulfadiazine, urea, and vitamin A, and the control group was treated with the ointment alone. For histological and ultrastructural assessment, cutaneous tissue was collected on postoperative days 3 (group I), 7 (group II), 14 (group III), and 21 (group IV). After the evaluation period, in each group, a skin fragment was collected for analysis of the collagen concentration, as well as the collagen fibril diameter and density by transmission electron microscopy. The results indicated that treatment with equine PRP combined with topical application of the ointment was effective in facilitating the maturation of collagen fibrils and the wound healing process.(AU)

Morphofunctional and ultrastructural evaluation of hip joint development in human fetuses / Evaluación morfofuncional y ultraestructural del desarrollo de la articulación de la cadera en fetos humanos

SUMMARY: The normal sequential development of the hip joint (HJ) was considered for the evaluation of the morphological and ultrastructural aspects of the joint cartilage of the proximal femoral head epiphysis in human fetuses between 16 to 31 weeks of intra uterine life (IUL). Twenty human fetuses were fixed in 10 % formalin solution. Fetuses were divided into 4 groups (n=5): Group 1 (G1): 16-19 weeks IUL; Group 2 (G2): 20-23 weeks IUL; Group 3 (G3): 24-27 weeks IUL and Group 4 (G4): 28-31 weeks IUL. The right moieties of the HJ were subjected to light microscopy to determine the chondrocyte area, volume, and density and the extracellular matrix (ECM) density. The collagen component in ECM was qualitatively evaluated using Safranin-O and picrosirius techniques under polarized light. The left portions were analyzed using scanning electron microscopy (SEM). The advance of age revealed a gradual increase in chondrocyte area and volume and in ECM density, and a decrease in chondrocyte density. The apparent prevalence of type II collagen fibers in G1 and type III collagen fibers in G4, as well as a balance between type I and III collagen fibers in G2 and G3 suggest a process of cartilaginous evolution and repair. The pantographic organization of the collagen fiber meshes from the depth to the cartilage surface of the femoral head suggests that the arcade collagen network architecture starts at the fetal stage, regardless of the compressive forces applied. The morphological data may contribute not only to a better understanding of the maturation and cartilage organization in this area but also to serve as a theoretical basis for aspects related to diseases and joint malformations.

RESUMEN: El desarrollo secuencial normal de la articulación de la cadera (AC) se consideró para la evaluación de los aspectos morfológicos y ultraestructurales del cartílago articular de la epífisis proximal y de la cabeza femoral en fetos humanos entre 16 y 31 semanas de vida intrauterina (SVIU). Veinte fetos humanos fueron fijados en solución de formalina al 10 %. Los fetos se dividieron en 4 grupos (n = 5): Grupo 1 (G1), 1619 semanas de IUL; Grupo 2 (G2), 20-23 semanas SVIU; Grupo 3 (G3), 24-27 semanas SVIU y Grupo 4 (G4), 28-31 semanas SVIU. Las muestras derechas de la AC se sometieron a microscopía óptica para determinar el área, el volumen y la densidad de los condrocitos y la densidad de la matriz extracelular (MEC). El componente de colágeno en la MEC se evaluó cualitativamente utilizando técnicas de safranina-O y picrosirius bajo luz polarizada. Las muestras de la AC izquierda se analizaron utilizando microscopía electrónica de barrido (MEB). El avance de la edad reveló un aumento gradual en el área y el volumen de los condrocitos y en la densidad de la MEB, y una disminución en la densidad de los condrocitos. La aparente prevalencia de las fibras de colágeno tipo II en G1 y tipo III en G4, así como el equilibrio entre las fibras de colágeno tipo I y III en G2 y G3 sugieren un proceso de evolución y reparación cartilaginosa. La organización pantográfica de las mallas de fibra de colágeno desde la profundidad a la superficie del cartílago de la cabeza femoral sugiere que la arquitectura de la red de colágeno comienza en la etapa fetal, independientemente de las fuerzas compresivas aplicadas. Los datos morfológicos pueden contribuir no solo a una mejor comprensión de la organización de la maduración y el cartílago en esta área, sino también servir de base teórica para los aspectos relacionados con enfermedades y malformaciones articulares.

Stereological analysis of elastic fibers of the corpus cavernosum of rats during the aging process

Abstract Purpose To evaluate changes in the quantity of elastic fibers in the corpora cavernosa of rats during the natural aging process, and to assess the degree of this change by determining volumetric density (Vv) at different ages via stereological analysis. Methods Forty-eight rats, raised under similar conditions, were subjected to the natural aging process and divided into four groups (G1 to G4), according to age at the time of penectomy (6, 9, 12, and 24 months, respectively). Histological sections of the middle segment of the penis were stained with Weigert's resorcin-fuchsin, and the volumetric density (Vv) of elastic fibers of the corpora cavernosa were determined via stereological analysis. Results There were no statistically significant differences in Vv among groups G1, G2, and G3. These three groups were therefore considered as a single group. The mean Vv of this group showed a statistically significant reduction compared to that of G4 (0.16 vs. 0.11, p<0.05). Conclusion Natural aging in rats was responsible for a reduction in volumetric density of elastic fibers of the corpora cavernosa (approximately 30% decrease in Vv) during senescence.

Scanning electron microscopy of granuloma annulare

Abstract: Light microscopy of granuloma annulare shows mucin deposition with lympho-histiocytic infiltrate. We describe the ultrastructural three-dimensional aspects of a typical case of granuloma with characteristic histopathological findings. At the ultrastructural level, affected collagen bundles and granular mucin deposition were observed. Round cells corresponding to lymphocytes were identified. Bigger oval cells, corresponding to isolated or palisading histiocytes were also found. The ultrastructural aspects overlap with light microscopy and contribute to its iconographic documentation.

Evaluation of dermal collagen stained with picrosirius red and examined under polarized light microscopy

Abstract: The special picrosirius red staining highlights the natural birefringence of collagen fibers when exposed to polarized light. The results from birefringence allow to evaluate the organization of the collagen fibers in the tissues. The authors intend to elucidate all steps to obtain and capture images of histological sections stained with picrosirius red and evaluated under polarized light microscopy, as well as possible artefacts that may occur.

Morphological changes in rat rectus abdominis muscle induced by diabetes and pregnancy

The urethral muscle of diabetic pregnant rats is affected by long-term mild diabetes and short-term severe diabetes, which plays a crucial role in the pathogenesis of pelvic floor disorders. We hypothesized that muscles outside the pelvis are subject to similar changes. The current study aimed at analyzing the effects of long-term mild and short-term severe diabetes on the structure and ultrastructure of fiber muscles and collagen in rats' rectus abdominis (RA) muscle. Therefore, the RA muscle of virgin, pregnant, long-term mild diabetic, short-term severe diabetic, long-term mild diabetic pregnant and short-term severe diabetic pregnant 3-month-old Wistar rats were collected. The structure was analyzed by picrosirius red staining, immunohistochemistry for fast and slow muscle fibers and transmission electron microscopy. We investigated two levels of STZ- induced diabetes: long-term mild diabetes (blood glucose level: 120-200 mg/dL) and short-term severe diabetes (blood glucose level >300 mg/dL). Long-term mild diabetic pregnant and short-term severe diabetic pregnant rats had decreased fast fibers and increased slow fibers, disrupted areas of sarcomere, intermyofibrillar mitochondria and myelin figures in the RA muscle. Both groups enabled us to analyze the specific influence of pregnancy, separately from diabetes. The current study demonstrated that diabetes and pregnancy induced intramuscular transformation and reorganization of RA muscle with a switch of fiber type adjusting their architecture according to intensity and duration of hyperglycemic insult within pregnancy.

Ultrastructural aspects of pseudoxanthoma elasticum

Abstract: We report the ultrastructural findings in a case of a 72-year-old black woman with confluent yellowish papules in the cervical region. She had no comorbidities. Ophthalmological examination, electrocardiogram, and echocardiogram were normal. Hematoxylin-eosin staining of the affected skin showed strong alterations in the mid-dermis with irregular clumps of eosinophilic material and loss of the normal parallel arrangement of collagen bundles. Orcein staining revealed that the elastic fibers lost their normal linear configuration, showing clump fragmentation, sometimes forming square structures. Transmission electron microscopy showed aberrant elastic fibers with an irregular outline and heterogenic inner structures. We also observed small elastic fibers. Collagen fibers showed a normal structure with irregular distribution. Scanning electron microscopy revealed important disorganization of collagen fibers and small stone-like deposits measuring around 5 µm associated with bigger structures ranging from 10-16 µm. Higher magnification revealed that these small stone-like structures were sometimes polyhedral-shaped or squared.

Estudio histoquímico de la distribución de las fibras de colágeno en hueso sesamoídeo distal de equinos con y sin síndrome navicular / Histochemical study of the distribution of collagen fibers on distal sesamoid bone in equine with and without navicular syndrome

La significancia funcional de cualquier relación que exista entre la orientación de las fibras de colágeno y la tensión ejercida sobre una estructura ósea dependerá de la influencia de estos parámetros microestructurales sobre las propiedades biomecánicas del hueso y su capacidad de adaptarse. Se estudió la localización del colágeno en el hueso sesamoídeo distal (HSD) de la mano en equinos con Síndrome Navicular para observar cómo este refleja las demandas biomecánicas ejercidas por la tensión que ejerce el tendón del músculo flexor digital profundo sobre la articulación interfalángica distal. Se utilizaron las tinciones hematoxilina-eosina-azul alcián, y Rojo Picrosirius de Junqueira. La birrefringencia de colágeno óseo fue determinada utilizando microscopía de luz polarizada. La remodelación del HSD resultó en la formación de osteonas secundarias transversales orientados en una dirección lateral a medial y el colágeno óseo se orientó de manera similar. Estos resultados proporcionan evidencia de la existencia de una relación entre la función mecánica de un hueso con su arquitectura, incluso demuestra que esta se extiende hasta el nivel molecular.

The functional significance of any relationship exists between the orientation of the collagen fibers and the strain on a bone structure depend on the influence of these microstructural parameters on the biomechanical properties of bone and its ability to adapt. Localization of collagen was studied in the distal sesamoid bone (DSB) in in equine foot with Navicular Syndrome to see how this reflects the biomechanical demands by the tension exerted by the tendon of the deep digital flexor muscle on the joint distal interphalangeal. Hematoxylin-eosin-alcian blue staining, and Red Picrosirius of Junqueira were used. The birefringence of bone collagen was determined using polarized light microscopy. The remodeling of DSB resulted in the formation of transverse secondary osteons oriented lateral to medial and bone collagen was oriented in similar direction. These results provide evidence for the existence of a relationship between the mechanical function of a bone with the architecture, and shows further that this extends up to the molecular level.

Análise ultraestrutural e implicação do RNA de interferência na fibrilogênese do colágeno V em pacientes com esclerodermia / Ultrastructural analysis and implication of RNA interference in collagen V fibrillogenesis in patients with scleroderma

Introdução: Recentemente muitas são as funções atribuídas ao colágeno V em condições fisiológicas normais e em algumas doenças, como na esclerodermia. Esta proteína apresenta características estruturais singulares de regulação do diâmetro das fibrilas heterotípicas, e imunogenicidade, sendo capaz de desencadear uma resposta imune independente. Em descobertas recentes, desenvolvidas por nosso grupo, ficou evidenciado que o colágeno V apresenta histoarquitetura anômala, aumentando a sua imunoexpressão na pele e pulmão em estágios iniciais da doença, assim como, aumento do RNAm de suas cadeias, principalmente alfa2(V). Por esta razão e com o intuito de entender sobre os processos moleculares e ultraestruturais que correlacionam o COL V à fibrose na ES, a proposta do presente estudo foi realizar análise morfológica e ultraestrutural das cadeias, alfa1(V) e alfa2(V), da pele de pacientes com ES, assim como avaliar a influência do gene COL5A2 na fibrilogênese. Pacientes e Métodos: As análises foram desenvolvidas utilizando fragmento de pele obtidas de biópsia, tanto de pacientes como controles, sob aprovação do comitê de ética (CAPPesq 0331/10) e de acordo com Declaração de Helsinque. Participaram do estudo 7 pacientes (homens=3, mulheres=4) diagnosticados com ES há dois anos ou menos, e indivíduos voluntários saudáveis (n=7) utilizados como grupo controle. A biópsia das peles foi dividida para dois grupos de análises: estudos histológicos e cultura de fibroblastos; sob solução de formol a 10%, foram realizadas análises histomorfométricas [coloração de Hematoxilina e Eosina (H e E), Tricrômico de Masson, imunofluorescência (IM) para cadeias alfa1(V) e alfa2(V), e reconstrução tridimensional (Zeiss LSM 510 META/UV)], e em solução de glutaraldeído 2% para análise ultraestrutural (microscopia eletrônica de transmissão com imunomarcação com ouro coloidal). A quantificação das cadeias foi realizada por histomorfometria, através de análise de imagem utilizando o software...

Introduction: Recently many functions are attributed to type V collagen in normal physiological conditions and in some diseases, such as scleroderma. This protein presents unique structural features for regulating the diameter of fibrils heterotypic and immunogenicity being capable of eliciting an immune response independent. In recent discoveries, developed by our group, it was evident that collagen V presents anomalous histoarchitecture, increasing the immunoexpression in the skin and lung in the early stages of the disease, as well as increased mRNA of his chains, mainly alpha2(V). For this reason and in order to understand the molecular and ultrastructural processes that correlate COL V fibrosis in SSc, the purpose of this study was to perform morphological and ultrastructural analysis of the chains alpha1(V) and alpha2(V) of the patient´s skin with ES, as well as to assess the influence of the COL5A2 gene in fibrillogenesis. Patients and Methods: The analyses were developed using skin fragment obtained from biopsy, both of patients and controls, under the approval of the ethics committee (CAPPesq 0331/10) and in accordance with the Declaration of Helsinki. The study included 7 patients (male = 3, female = 4) diagnosed with ES for two years or less, and healthy volunteers (n = 7) used as a control group. The biopsy of the skin was divided in two groups of analyzes: histological studies and cultured fibroblasts; Under formaldehyde solution 10%, histomorphometric analysis [staining with hematoxylin and eosin (H e E), Masson's trichrome, immunofluorescence (IM) to alpha1(V) and alpha2(V) chains, and three-dimensional reconstruction (Zeiss LSM 510 META were performed/UV), and in a solution of 2% glutaraldehyde for ultrastructural analysis (transmission electron microscopy with immunostaining with colloidal gold). Quantitation was performed by the chain histomorphometry by image analysis using Image Pro-Plus 6.0 software. Already a fibroblast culture...

Structural changes of dilated pelvic ureters in adults

PURPOSE: To perform a quantitative assessment of different types of pelvic ureter tissues with chronic dilation in adults, using stereological methods. METHODS: We analyzed fragments of dilated pelvic ureters obtained from 6 patients aged between 35 and 67 years (mean, 46 years) who underwent ureteral reimplantation surgery for different reasons. The obstruction duration ranged from 27 to 180 days (mean, 93 days). The control group included fragments of normal pelvic ureters obtained during nephrectomy in 7 kidney transplant donors (age: range, 25-51 years; mean, 36 years). The volumetric density of collagen in the ureter, elastic fibers, and smooth muscle fibers was assessed. RESULTS: The volumetric density (Vv) of collagen showed no significant difference between the two groups (control: 45.3 ± 6.1; dilated: 40.8 ± 6.9; P = 0.23). A statistically significant increase in Vv of elastic fibers was observed in the dilated ureters (control: 18.4 ± 1.2; dilated: 24.6 ± 5.4; P = 0.03). A statistically significant increase in the Vv of smooth muscle fibers was observed in the dilated ureter (control: 42.0 ± 6.0; dilated: 56.2 ± 6.1; P = 0.001). CONCLUSION: The chronically dilated pelvic ureters had significantly more elastin and smooth muscle contents than the controls. .

Comparative histological study of human adult cervical and lumbar intervertebral discs and its relation to functions and diseases

The intervertebral discs are the major structural links between adjacent vertebrae. They serve to allow greater movement and compression between vertebral bodies. However, there is regional difference in disc structure and pathology relative to different mechanical stresses and load bearing. Comparing the histological structure of human cervical and lumbar intervertebral discs at adult age to analyze the extent of variations in structure between these regions and its relation to their functions and diseases. [12] IVDs: [4] C3C4, [4] L4L5 and [4] L5S1 and adjacent bony vertebrae were removed from each of 12 adult male and female humans at autopsy. The discs and vertebrae were processed for paraffin sections and stained by haematoxylin and eosin, trichrome, orcein and safranin stains. Histomorphometric study and statistical analysis were conducted. L4-L5, L5-S1 IVDs presented less collagen and more elastic fibers in posterior region of annulus fibrosus than anterior region, peripheral regions were thicker than central one of lumbar end plate. The annulus fibrosus invading nucleus pulposus and dividing it but at cervical level invading without dividing it. Safranin reaction was positive and much higher in cervical than in lumbar annulus fibrosus. The reaction was much higher in lumbar than in cervical nucleus pulposus. There are significant differences in collagen, elastic fibers and heights of cervical and lumbar discs. There are histological differences of human adult intervertebral discs in cervical and lumber regions which may affect their mechanical and physiologic functions and provide a better understanding of the external factors causing spinal disorders and enable the best method to be applied to the patients both at the diagnosis and the treatment stage

Classical Ehlers-Danlos syndrome: clinical, Histological and ultrastructural aspects / Síndrome de Ehlers-Danlos clássica: aspectos clínicos, histológicos e ultraestruturais

A 12-year-old boy with difficulty in wound healing and scars of unusual appearance was examined. Thin, shiny and protruding skin, characterizing pseudotumoral lesions, was observed on his knees and elbows. Loose joints and increased skin elasticity were also observed. Light microscopy showed rare collagen bundles and loosely dispersed collagen fibers. Irregularly distributed elastic tissue was observed, and transmission electron microscopy revealed disorganized collagen fibers. In cross sections under high magnifications, fibers of varying diameters could be seen, as well as an irregular fiber outline. Scanning electron microscopy of the dermis showed disorganized collagen fibers, which were rarely arranged in bundles. Isolated and crossed-over fibers were also found.

Paciente masculino de 12 anos relatou dificuldade em cicatrizar, seguido por cicatrizes de aspecto infrequente . A pele dos joelhos e cotovelos é fina, brilhante e protrusa, caracterizando pseudo- tumores. Além disso apresenta hiperelasticidade cutânea e articular. A microscopia óptica demonstrou raros feixes colágenos, as fibras colágenas encontram-se dispersas. O tecido elástico está presente e secundariamente irregular. A microscopia eletrônica de transmissão também observou fibras colágenas desorganizadas e com cortes transversais em grande aumento evidenciou diâmetros variados e contorno irregular das mesmas. A microscopia eletrônica de varredura da derme demonstrou raros feixes colágenos e fibras colágenas isoladas e entrecruzadas.

Morphological and ultrastructural characteristics of extracellular matrix changes in oral squamous cell carcinoma.

Background: The biology of oral squamous cell carcinoma (OSCC), including its progression from dysplasia to carcinoma, "field effects", genetic changes in tumor associated mucosa (TAM) and effect of matrix metalloproteinases in breaking down of matrix proteins to facilitate invasion, has been well documented. However, what remains to be done is to extrapolate this knowledge to improve patient care. Aim: The aim of this study was to observe the extracellular matrix (ECM) changes with the routine histochemical stains available to most histopathologists. Materials and Methods: The study includes 72 cases of OSCC in which the tumor and adjacent normal appearing areas were sampled to study the ECM changes with hematoxylin and eosin (H and E) and Verhoeff's-Van Gieson elastic stain (VVG). Results: Basophilic fragmentation of collagen (H and E) and clumped short elastic fibers (VVG) were seen in 12 (16.7%) cases. Of the remaining cases, 18 (25%) had a dense lymphocytic infiltrate and had no demonstrable elastic fibers. Those cases with H and E changes were further studied and compared with normal mucosa for ultrastructural changes. The ultrastructural study demonstrated an increase in oxytalan, elaunin and elastic fibers and decrease in collagen fibers with some transformation changes associated with OSCCs and lymph node metastasis. Conclusion: Changes in transformation of collagen to elastic fibers and also the loss of both the fibers in areas of lymphocytic infiltration possibly indicate degradation of ECM fibers by factors released from the lymphocytes or tumor cells and the limiting effect on the tumor by ECM remodeling.

Influence of dental exposure to oral environment on smear layer removal and collagen exhibition after using different conditioning agents

Although in vitro studies have shown encouraging results for root surface conditioning with demineralizing agents, in vivo studies have failed to show its benefits in periodontal healing. This can be attributed to several factors, among which, the hypermineralization of dental surface. Therefore, this in vitro study compared, using scanning electron microscopy (SEM), the effect of root surface conditioning with different conditioners (1% and 25% citric acid, 24% EDTA and 50 mg/mL tetracycline hydrochloride) in impacted teeth and in teeth that had their roots exposed to the oral environment. One trained examiner assessed the SEM micrographs using a root surface modification index. There was a tendency of more root surface modification in the group of impacted teeth, suggesting that the degree of root mineralization influences its chemical demineralization.

Apesar de estudos in vitro terem demonstrado resultados favoráveis ao condicionamento da superfície radicular com agentes desmineralizantes, estudos in vivo não mostraram seus benefícios na cicatrização periodontal. Isto pode ser atribuído a vários fatores, entre os quais, a hipermineralização da superfície dental. Portanto, este estudo in vitro comparou, usando microscopia eletrônica de varredura, o efeito do condicionamento da superfície radicular com diferentes condicionadores (1% e 25% de ácido cítrico, EDTA 24% e 50 mg/mL de cloridrato de tetraciclina) em dentes impactados e dentes que tinham suas raízes expostas ao meio bucal. Um examinador treinado avaliou as microscopias eletrônicas de varredura utilizando um índice de modificação da superfície radicular. Houve uma tendência de maior modificação da superfície radicular no grupo de dentes impactados, sugerindo que o grau de mineralização da raiz influencia a sua desmineralização química.

Histological, immunohistochemical and quantitative analysis of collagen in patients with direct inguinal hernia

Abnormal collagen metabolism is thought to play an important role in the development of abdominal hernia. This is underlined by detection of altered collagen metabolism and structural changes of the tissues in patients with inguinal hernia. Was to study collagen synthesis defect in patients with direct inguinal hernia. Specimens were obtained from skin, transversalis fascia and sacs from forty two adult male patients with direct inguinal hernia and from 30 control adult patients without hernia during appendectomy. Sections from the specimens were stained with haematoxylin and eosin and Masson's trichrome stains, for light microscope. Furthermore, immunohistochemical study for collagen type III and histological quantitative analysis of total collagen were done. Other specimens were processed for electron microscopic study. Histological study of the tissues of patients with direct inguinal hernia revealed that the collagen fibers appeared loosely packed, widely separated and there was decrease in bundle formation. The immunohistochemical study showed an increase in type III collagen fibrils in comparison to that of controls. Also, there was a significant decrease in the amount of total collagen content compared to the control group. The electron microscopic study revealed degenerative changes in the fibroblasts associated with loosely packed collagen fibrils. These changes were detected in all studied tissues. We concluded that the substitution of collagen type I by collagen type III that has less tensile strength predisposes to development of direct inguinal hernia. We also concluded that inguinal hernia may be a local manifestation of a systemic disorder of collagen metabolism

Impacto da mitomicina-C tópica na deposição de colágeno em torno de enxerto de gordura na prega vogal de coelhos: estudo histológico e morfométrico / Impact of topical mitomycin-C in the deposition of collagen around fat grafts in vocal folds of rabbits: histologic and morphometric study

Desde o início de 1990, a enxertia de gordura na prega vocal é descrita como um método para reparar a insuficiência glótica. O objetivo deste estudo é avaliar os efeitos da aplicação tópica de mitomicina-C no processo cicatricial de enxertos autólogos de gorduras inseridos em pregas vocais de coelhos através da medida da deposição de colágeno. Vinte e oito coelhos foram submetidos a enxertia de gordura em ambas pregas vocais. As pregas vocais direitas recebeu previamente a aplicação tópica de mitomicina-C (0,4mg/ml) durante cinco minutos enquanto que as pregas vocais esquerdas formavam o grupo controle (sem mitomicina-C). Quatro grupos com 6 coelhos cada foram sacrificados com 7, 14, 30 e 90 dias após a cirurgia de enxertia. As pregas vocais foram removidas para estudo histológico com a intenção de quantificar a deposição de colágeno através da coloração por Picrossírius Red sob microscopia polarizada. A deposição de colágeno foi menor em todos os grupos de pregas vocais que receberam aplicação tópica de mitomicina-C quando comparada com as pregas vocais do grupo controle. No presente estudo, a aplicação tópica de mitomicina-C antes da enxertia de gordura reduziu significativamente a deposição de colágeno (p = 0,05).

Since the early 1990s, fat implantation in the vocal fold is described as a method of repairing glottal insufficiency. The aim of this study was to evaluate the effect of topical application of mitomycin in the healing process with collagen deposition measurement around of autologous fat implants inserted in rabbits vocal folds. Twenty-eight rabbits were submitted to a fat implant in the both vocal folds. The right vocal folds received previously topical application of mitomycin (0,4mg/ml) for five minutes and the left vocal folds were the control group (without mitomycin). Four groups of 6 rabbits each were sacrificed 7, 14, 30 and 90 days after the implantation. The samples of the vocal folds were collected for histological analysis with the purpose of quantifying the collagen deposition by Picrosirius Red stain under polarization microscopy. The collagen deposition was lower in all groups of vocal folds with topical application of mitomycin than in control groups. In the present study, the topical application of mitomycin before the fat grafts reduced significantly the collagen deposition (p = 0,05).

Avaliação microscópica e ultra-estrutural do endotélio de veia safena preparada pela técnica "no touch" / Microscopic and ultrastructural evaluation of the saphenous vein endothelium for CABG prepared by the no touch technique

OBJETIVO: O enxerto de veia safena (VS) utilizado em revascularização miocárdica possui uma vida útil, sendo o estágio final a oclusão do vaso. Esforços em adquirir novas técnicas de coleta da VS podem possibilitar uma viabilidade maior do enxerto. MÉTODOS: Vinte pacientes foram randomizados e divididos em dois grupos com o objetivo de avaliação do endotélio vascular. A técnica "no touch" (NT) consiste em retirar o segmento de VS com o tecido perivascular. A técnica convencional consiste em retirar a VS, com remoção "in situ" do tecido perivascular e conseqüente vasoespasmo. Houve um padrão de retirada das VS com incisões longitudinais escalonadas. Características da VS foram consideradas. A avaliação do endotélio das VS foi realizada usando microscópio eletrônico (ME) pelo método de varredura e de transmissão. Cortes histológicos das VS foram corados em Hematoxilina-Eosina (HE). O colágeno subendotelial foi analisado pelos métodos de Picro-Sirius e Tricrômio de Masson. RESULTADOS: A ME evidenciou que o Grupo NT possui maiores áreas endoteliais não desnudadas, além de um menor número de células degradadas. A coloração em HE nos permitiu verificar a forma e a integridade das camadas das VS. Há um predomínio maior de fibras colágenas coradas no Grupo NT. CONCLUSÕES: A técnica NT permite uma melhor preservação endotelial da VS, sugerindo um enxerto mais viável em longo prazo.

OBJECTIVE: Saphenous vein grafts (SV) used in coronary artery bypass grafting have a limited life and vein occlusion may be the final adverse effect. Efforts to develop new techniques to harvest the saphenous vein may improve the viability of the graft. METHODS: Twenty patients were randomly divided into two groups with the objective of evaluating the vascular endothelium. The No Touch (NT) technique consists in removing the saphenous vein with perivascular tissue. The conventional technique consists in harvesting with "in situ" removal of the perivascular tissue. The standard saphenous vein harvesting procedure used bridged incisions. Characteristics of the vein were considered. Evaluation of the endothelium was achieved by electron microscopy and histologic analysis using hematoxylin eosin staining. The Picrosirius and Masson Trichrome methods were used to analyze subendothelial collagen. RESULTS: Electron microscopy demonstrated that the NT Group had larger non-denudated endothelial areas as well as a smaller number of degraded cells. Histological analysis showed the form and integrity of the saphenous vein layers. A larger amount of collagen fibers were identified in the NT Group. CONCLUSIONS: The NT technique better preserves the saphenous vein endothelium suggesting a more viable graft in the long term.

Three-dimensional characteristics of the interface epithelium-connective tissue surface of fingeres lamina propria of Cebus apella monkey: scanning electron microscopy study / Características tri-dimensionales superficiales de la lámina propia de los dedos de monos Cebus apella: interfase del tejido epitelial-conectivo del estudio con microscopía electrónica de barrido

In the present paper were analysed the three-dimensional characteristics of the interface epithelium-connective tissue surface of finger prints of Cebus apella monkey employing the scanning electron microscopic methods. The connective tissue core (CTC) and epithelial papillae were examined verifying the three-dimensional configuration of the tissue projections. The samples were fixed in Bouin solsution for histologic preparations and in modified Karnovsky for examine to observe in scanning electron microscopy. After treatment in the 10 percent NaOH solution during 3 to 5 day s, the surface of finger prints revealed a distribution of CTC of lamina propria in situ showing original three-dimensional SEM images. The linear and circular dispositions CTC, and the furrows were clearly identified. Each pointed papilla presented a large base and longitudinal disposition of thick collagen fiber bundles and in some areas with a complex reticular formations. The longitudinal furrows between the pointed papillae exhibited a dense layer of connective tissue and showed only low CTC or laminar in shape. The presence of numerous foramina of sweat gland were noted in three-dimensional SEM images.

Se analizaron tridimensionalmente las características de la interfase del tejido epitelio-conectivo en la superficie de huellas dactilares de mono Cebus apella, empleando el microscopio electrónico de barrido. El núcleo del tejido conectivo (NTC) y las papilas epiteliales se examinaron en las tres dimensiones. Las muestras fueron fijadas en solución histológica Bouin para los preparativos y en Karnovsky modificada para examinar y observar en el microscopio electrónico de barrido. Después del tratamiento en solución de NaOH al 10 por ciento, durante 3 a 5 días, la superficie de las huellas dactilares revelaron una distribución de NTC de lámina propia in situ mostrando imágenes en tres dimensiones originales con microscopio electrónico de barrido. Las disposiciones lineal y circular del NTC están claramente identificadas. Cada papila señalada presenta una gran base y la disposición longitudinal de gruesos haces de fibras de colágeno y, en algunas zonas con formaciones de un complejo reticular. Los surcos longitudinales entre las papilas señaladas mostraron una densa capa de tejido conectivo con NTC bajos o de forma laminar. La presencia de numerosos forámenes de las glándulas sudoríparas se observaron en tres dimensiones.

Efeito do resfriamento sobre a textura post-mortem da carne do peixe matrinxã Brycon cephalus / Chilling effect on the post-mortem texture of the matrinxã fish muscle Brycon cephalus

Os mecanismos que causam o amolecimento e a perda na textura post-mortem da carne de matrinxã foram determinados por meio das mudanças na microestrutura do músculo, imediatamente após a morte e depois de 12 horas de estocagem a -3ºC. As observações na microestrutura, realizadas com microscópio eletrônico de transmissão, foram semelhantes aos resultados obtidos na força de ruptura do músculo medidos com o texturômetro. Os valores da força da ruptura foram menores para a carne após o resfriamento. Observou-se que as fibras do colágeno do tecido conectivo pericelular se desintegraram e que as do colágeno do tecido conectivo do miocommata conservaram sua arquitetura e integridade. Houve pouca degradação da linha Z. Isso sugere que o amolecimento post-mortem da carne de mantrinxã, durante a estocagem a -3ºC, é causado pela degradação do tecido conectivo pericelular

In order to determine the mechanisms that cause the post mortem muscle softness of the matrinxã Brycon cephalus, changes in the micro structure of the muscle were observed immediately after death and after 12 hours of storage at -3º C, measuring the firmness of the flesh with test instruments. Observations by the transmission electron microscope were similar to the results obtained in the breaking strength of the muscle measured with a texturometer. The values of the breaking strength of the fish muscle were smaller after chilling. At the same time, it was observed that the collagen fibers of the pericellular connective tissue had disintegrated, while the collagen fibers of the miocommata connective tissue maintained their organization and integrity. No evident breakdown of Z-discs was observed. It is suggested that the post-mortem tenderization of the matrinxã muscle during chilled storage was due to the disintegration of the collagen fibers in the pericellular connective tissue and, in a smaller extent, to the weakening of Z-disk

Microwave-induced fast decalcification of rat bone for electron microscopic analysis: an ultrastructural and cytochemical study

Bone decalcification is a time-consuming process. It takes weeks and preservation of the tissue structure depends on the quality and velocity of the demineralization process. In the present study, a decalcification methodology was adapted using microwaving to accelerate the decalcification of rat bone for electron microscopic analysis. The ultrastructure of the bone decalcified by microwave energy was observed. Wistar rats were perfused with paraformaldehyde and maxillary segments were removed and fixed in glutaraldehyde. Half of specimens were decalcified by conventional treatment with immersion in Warshawsky solution at 4ºC during 45 days, and the other half of specimens were placed into the beaker with 20 mL of the Warshawsky solution in ice bath and thereafter submitted to irradiation in a domestic microwave oven (700 maximum power) during 20 s/350 W/±37ºC. In the first day, the specimens were irradiated 9 times and stored at 40ºC overnight. In the second day, the specimens were irradiated 20 times changing the solution and the ice after each bath. After decalcification, some specimens were postfixed in osmium tetroxide and others in osmium tetroxide and potassium pyroantimonate. The specimens were observed under transmission electron microscopy. The results showed an increase in the decalcification rate in the specimens activated by microwaving and a reduction of total experiment time from 45 days in the conventional method to 48 hours in the microwave-aided method.

A preservação da estrutura de ossos é dependente da qualidade e da velocidade em que ocorre o processo de desmineralização. Neste estudo foi observada a ultraestrutura de maxila de rato descalcificada utilizando microondas. Ratos Wistar sofreram perfusão com paraformaldeído e o segmento de maxila retirado e fixado em glutaraldeído. Após esta etapa algumas amostras foram descalcificadas por imersão em solução de Warshawsky durante 45 dias a 4(0)C. Outras amostras foram submetidas a irradiação por microondas (forno de microondas doméstico 700 Watts de potência), durante 20 s/350 W/ ± 37ºC. No primeiro dia foram realizadas um total de 9 irradiações e os espécimes foram deixadas posteriormente a 4ºC por 12 h na solução descalcificadora sem agitação. No segundo dia, os fragmentos foram submetidos à nova irradiação totalizando 20 banhos, trocando-se a solução e o gelo a cada banho. A seguir algumas amostras foram pós-fixadas com tetróxido de ósmio e outras com tetróxido de ósmio e piroantimonato de potássio. As amostras foram observadas em microscópio eletrônico de transmissão. Os resultados mostraram que o processo de descalcificação ativado por microondas reduziu para 48 h o período de descalcificação, o qual pelo método tradicional ocorre em 45 dias.