COL4A5 genotypes and clinical characteristics of children with Alport syndrome / 中国当代儿科杂志

OBJECTIVES@#To investigate the genotypes of the pathogenic gene COL4A5 and the characteristics of clinical phenotypes in children with Alport syndrome (AS).@*METHODS@#A retrospective analysis was performed for the genetic testing results and clinical data of 19 AS children with COL4A5 gene mutations.@*RESULTS@#Among the 19 children with AS caused by COL4A5 gene mutations, 1 (5%) carried a new mutation of the COL4A5 gene, i.e., c.3372A>G(p.P1124=) and presented with AS coexisting with IgA vasculitis nephritis; 3 children (16%) had large fragment deletion of the COL4A5 gene, among whom 2 children (case 7 had a new mutation site of loss51-53) had gross hematuria and albuminuria at the onset, and 1 child (case 13 had a new mutation site of loss3-53) only had microscopic hematuria, while the other 15 children (79%) had common clinical phenotypes of AS, among whom 7 carried new mutations of the COL4A5 gene. Among all 19 children, 3 children (16%) who carried COL4A5 gene mutations also had COL4A4 gene mutations, and 1 child (5%) had COL4A3 gene mutations. Among these children with double gene mutations, 2 had gross hematuria and proteinuria at the onset.@*CONCLUSIONS@#This study expands the genotype and phenotype spectrums of the pathogenic gene COL4A5 for AS. Children with large fragment deletion of the COL4A5 gene or double gene mutations of COL4A5 with COL4A3 or COL4A4 tend to have more serious clinical manifestations.

Analysis of genetic variant in a child with autosomal recessive Alport syndrome / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a pedigree affected with Alport syndrome.@*METHODS@#Next generation sequencing and Sanger sequencing was applied to detect potential variants of the COL4A3, COL4A4 and COL4A5 genes among members from the pedigree and 100 unrelated healthy controls.@*RESULTS@#The proband and his twin brother were found to carry two novel variants, namely c.4953G>A and c.4623C>A, of the COL4A4 gene, which were respectively inherited from her father and mother. The same variants were not detected among the 100 healthy controls and medical literature. Based on the guidelines of the American College of Medical Genetics and Genomics, both the c.4953G>A and c.4623C>A variants were predicted to be pathogenic (PVS1+PM2_supporting+PP1).@*CONCLUSION@#The c.4953G>A and c.4623C>A variants of the COLA4A gene probably underlay the Alport syndrome in this pedigree. Above finding has enriched the spectrum of COLA4A gene variants.

Genetic and clinical analysis of a pedigree affected with X-linked dominant Alport syndrome due to a novel variant of COL4A5 gene / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a Chinese pedigree affected with X-linked hereditary Alport syndrome.@*METHODS@#Next generation sequencing was carried out for the pedigree. Candidate variant was validated by Sanger sequencing. Pathological changes of renal basement membrane and expression of COL4A5 protein were analyzed by renal biopsy and immunofluorescence assay, respectively.@*RESULTS@#All patients from the pedigree manifested progressive renal damage, gross hematuria, proteinuria and nephrotic syndrome. Renal biopsy of the proband revealed thickening of the basement membrane. No expression of the COL4A5 gene was detected by immunofluorescence. High-throughput sequencing and Sanger sequencing indicated that the proband has carried a c.3706delC (p.1236Pfs*69) variant in exon 41 of the COL4A5 gene. The same variant was also found in his mother and two brothers whom were similarly affected.@*CONCLUSION@#The novel c.3706delC (p.1236Pfs*69) variant of the COL4A5 gene probably underlay the pathogenesis of X-linked hereditary Alport syndrome in this pedigree. Above findings have enriched the spectrum of COL4A5 gene variants and provided a basis for the diagnosis and genetic counseling for the pedigree.

Distribuição ultraestrutural de colágeno tipo IV em feridas experimentais após tratamento com papaína / Ultrastructural distribution of type IV collagen in experimental wounds after treatment with papaine

RESUMO: Modelo do estudo: Experimental. Objetivo: Investigar a distribuição de fibras colágeno tipo IV, por microscopia eletrônica de transmissão, em feridas experimentais tratadas com soluções de papaína. Metodologia: Ratos Wistar (n=18), machos, adultos, foram submetidos a procedimento cirúrgico para a retirada de seção quadrada de pele da região cervical, e posteriormente separados em dois grupos: Grupo I (n = 9), sem tratamento; e Grupo II (n = 9), tratado com soluções de papaína a 10% (até o 7º dia), 6% (do 8º ao 14º dia) e 4% (do 15º ao 21º dia). Todos os animais foram sacrificados com 7, 14 e 21 dias, e as áreas lesadas retiradas, lavadas em PBS e fixadas em 2,5% de glutaraldeo, 4% de formaldeio recém preparado, em solução tamponada contendo 60 mM Pipes, 20 mM Hepes, 10 mM etilenoglicol-bis- (B-aminoetiléter) - Ácido N, N, N'-tetraacético, KCl 70 mM e MgCl2 5 mM pH 7,2 por 1h; pós-fixadas em solução contendo tetróxido de ósmio a 1%, ferrocianeto a 0,8% e cloreto de cálcio a 5 mM; desidratados em acetona graduada e embebidos em Epon® para confecção de secções finas, coradas com acetato de uranilo e citrato de chumbo, e examinadas em microscópio electrônico de transmissão Zeiss LEO EM 906 (TEM). Resultados: A distribuição das fibras colágeno tipo IV das lesões tratadas com papaína (Grupo II), com 14 e 21 dias, mostraram-se mais organizadas que as fibras do Grupo I. Conclusões: A papaína mostrou-se um importante facilitador para a organização de fibras colágeno tipo IV em feridas experimentais. (AU)

ABSTRACT Study model: Experimental. Objective: Investigate the distribution of type IV collagen fibers by transmission electron microscopy, in experimental wounds treated with papaine solutions. Methodology: Adult male Wistar rats (n = 18) underwent a surgical procedure to remove a square section of skin from the cervical region, and then separated into two groups: Group I (n = 9), without treatment; and Group II (n = 9), treated with papain solutions of 10% (up to the 7th day), 6% (from the 8th to the 14th day) and 4% (from the 15th to the 21st day). All animals were sacrificed at 7, 14 and 21 days, and the injured areas removed, washed in PBS, and fixed in 2.5% glutaraldehyde, 4% freshly prepared formaldehyde in buffered solution containing 60 mM Pipes, 20 mM Hepes, 10 mM ethyleneglycol-bis- (B-aminoethylether) -N, N, N'-tetraacetic acid, 70 mM KCl, and 5 mM MgCl 2 pH 7.2 for 1h; post-fixed in solution containing 1% osmium tethoxide, 0.8% ferrocyanide, and 5 mM calcium chloride; dehy-drated in graduated acetone and soaked in Epon® to make thin sections stained with uranyl acetate and lead citrate and examined under a Zeiss LEO EM 906 (TEM) transmission electron microscope. Results: The distribution of type IV collagen fibers from papaine-treated lesions (Group II) at 14 and 21 days was more organized than Group I fibers. Conclusions: Papaine has proven to be an important facilitator for the organization of type IV collagen fibers in experimental wounds. (AU)

Cutaneous collagenous vasculopathy: light and transmission electron microscopy

Abstract Cutaneous collagenous vasculopathy is a rare acquired idiopathic microangiopathy characterized by progressive development of diffuse asymptomatic telangiectasias and histologically by accumulation of collagen type IV around the affected vessels. It is diagnosed by its clinical history, confirmed by light microscopy with collagen-specific immunostaining. We report a case of a patient with extensive acquired telangiectasias on the left arm, clinically resembling unilateral nevoid telangiectasia. Dilated blood vessels with thickened walls were observed in the dermis. Immunohistochemistry with collagen IV antibodies revealed marked collagen deposition around the vessels, confirming the diagnosis. Transmission electron microscopy observed duplicate and triplicate vascular basal membrane associated with deposition of amorphous material around the membranes.

Analysis of Alport syndrome induced by type IV collagen alpha 5 gene mutation in two families / 浙江大学学报·医学版

OBJECTIVE@#To investigate genetic characteristics of Alport syndrome.@*METHODS@#High-throughput sequencing-based whole exome sequencing was performed in two patients with recurrent unexplained abnormal urinalysis. The pathogenicity of the genetic variations, type of Mendelian genetics, and clinical phenotypes were analysed, and the disease-cause mutations were confirmed in the family members using Sanger sequencing.@*RESULTS@#Two heterozygous splice site mutations of gene c.2147-2A > T (IVS27) and c.646-2A > G (IVS11) (NM_033380) were found in patients of the two families, which showed a co-segregation association with the affected members of the families.@*CONCLUSIONS@#Alport syndrome is mainly inherited from direct female patients, and prenatal genetic screening based on amniotic fluid testing can effectively prevent birth defects in patients with a family history of this characteristic phenotype.

Ramipril can alleviate the accumulation of renal mesangial matrix in rats with diabetic nephropathy by inhibiting insulin-like growth factor-1

Abstract Purpose: To investigate the impact of Ramipril (RAM) on the expressions of insulin-like growth factor-1 (IGF-1) and renal mesangial matrix (RMM) in rats with diabetic nephropathy (DN). Methods: The Sprague Dawley rats were divided into normal control (NC) group (n = 12), DN group (n = 11), and DN+RAM group (n = 12). The ratio of renal weight to body weight (RBT), fasting blood glucose (FBG), HbA1c, 24-h urine protein (TPU), blood urea nitrogen (BUN), creatinine (Cr), renal pathological changes, the levels of IGF-1, fibronectin (FN), type IV collagen (Col-IV), and matrix metalloproteinases (MMP)-2 were compared among the groups. Results: Compared with NC group, the RBT, FBG, HbA1c, TPU, BUN, Cr, and RMM in DN group were significantly increased (P < 0.05), the IGF-1, FN, and Col-IV were significantly upregulated (P < 0.05), while MMP was significantly downregulated (P < 0.05). Compared with DN group, the indexes except for the FBG and HbA1c in DN+RAM group were significantly improved (P < 0.05), among which IGF-1 exhibited significant positive correlation with TPU(r=0.937), FN(r=0.896) and Col-IV(r=0.871), while significant negative correlation with MMP-2 (r=-0.826) (P<0.05). Conclusion: RAM may protect the kidneys by suppressing IGF-1 and mitigating the accumulation of RMM.

Clinical features and COL4A1 genotype of a toddler with hereditary angiopathy with nephropathy, aneurysms and muscle cramps syndrome / 中国当代儿科杂志

Hereditary angiopathy with nephropathy, aneurysms and muscle cramps (HANAC) syndrome is an autosomal dominant genetic disease caused by COL4A1 gene mutation, with major clinical manifestations of white matter lesion, aneurysm, retinal artery tortuosity, polycystic kidney, microscopic hematuria and muscle cramps. This article reports the clinical features and genotype of one toddler with HANAC syndrome caused by COL4A1 gene mutation. The boy, aged 1 year and 8 months, had an insidious onset, with the clinical manifestations of pyrexia and convulsion, white matter lesions in the periventricular region and the centrum semiovale on both sides, softening lesions beside the left basal ganglia, retinal arteriosclerosis, microscopic hematuria and muscle cramps. Whole exome sequencing revealed a pathogenic de novo heterozygous mutation in the COL4A1 gene, (NM_001845) c.4150+1(IVS46)G>T, and therefore, the boy was diagnosed with HANAC syndrome. COL4A1 gene mutation detection should be performed for children with unexplained white matter lesion, stroke, hematuria, polycystic kidney, cataract and retinal artery tortuosity or families with related history.

Clinical and genetic diagnosis of a pedigree affected with autosomal recessive Alport syndrome / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis of a child with chronic kidney disease featuring renal shrinkage and creatinine increase.@*METHODS@#Peripheral venous blood samples were taken from the child, his brother and two parents and subjected to whole exome sequencing. Suspected mutations were verified by Sanger sequencing. Bioinformatic analysis was carried out to predict the influence of mutations on the structure and function of the protein product.@*RESULTS@#High-throughput and Sanger sequencing revealed that the child has carried compound heterozygous mutations of the COL4A4 gene, namely c.4550T>G in exon 47 (inherited from his mother) and c.199C>T in exon 5 (inherited from his father). Neither mutation was reported previously. Bioinformatic analysis showed that both mutations have located in highly conserved regions. The same mutations were not found in his brother.@*CONCLUSION@#The compound heterozygous c.4550T>G and c.199C>T mutations probably underlie the disease in this child. The findings have enriched the mutation spectrum of the COL4A4 gene.

Advances in research on gene and cell therapy for type IV collagen related hereditary kidney diseases / 中华医学遗传学杂志

Type IV collagen is a component of the extracellular matrix in the basement membrane. Abnormal secretion or assembly of type IV collagen may lead to kidney lesions resulting in numerous nephropathy symptoms, e.g., Alport syndrome, thin basement membrane nephropathy, and focal segmental glomerulosclerosis. Treatment for type IV collagen-related nephropathy includes drugs, kidney transplantation, gene and cell therapy. However, drugs are not always effective, and kidney transplantation is hindered by the shortage of donors. Moreover, basement membrane nephritis often occurs after kidney transplantation. Therefore, gene and cell therapy probably is the most promising treatment for type IV collagen related nephropathies.

De novo mutations in COL4A5 identified by whole exome sequencing in 2 girls with Alport syndrome in Korea / 소아과

Alport syndrome (ATS) is an inherited glomerular disease caused by mutations in one of the type IV collagen novel chains (α3, α4, and α5). ATS is characterized by persistent microscopic hematuria that starts during infancy, eventually leading to either progressive nephritis or end-stage renal disease. There are 3 known genetic forms of ATS, namely X-linked ATS, autosomal recessive ATS, and autosomal dominant ATS. About 80% of patients with ATS have X-linked ATS, which is caused by mutations in the type IV collagen α5 chain gene, COL4A5. Although an 80% mutation detection rate is observed in men with X-linked ATS, some difficulties do exist in the genetic diagnosis of ATS. Most mutations are point mutations without hotspots in the COL4A3, COL4A4, and COL4A5 genes. Further, there are insufficient data on the detection of COL4A3 and COL4A4 mutations for their comparison between patients with autosomal recessive or dominant ATS. Therefore, diagnosis of ATS in female patients with no apparent family history can be challenging. Therefore, in this study, we used whole-exome sequencing (WES) to identify mutations in type IV collagen in 2 girls with glomerular basement membrane structural changes suspected to be associated with ATS; these patients had no relevant family history. Our results revealed de novo c.4688G>A (p.Arg1563Gln) and c.2714G>A (p.Gly905Asp) mutations in COL4A5. Therefore, we suggest that WES is an effective approach to obtain genetic information in ATS, particularly in female patients without a relevant family history, to detect unexpected DNA variations.

Effects of centellaasiatica granule on the expression of Smad 2/3, Smad 7 and collagen Ⅳ in the mesangial cells stably expressed TGF-β1 / 中国应用生理学杂志

OBJECTIVES@#Stably expressed transforming growth factor -beta 1(TGF-β1)MCs were obtained and the effects of centellaasiatica (CA) granule on the expressions of Smad 2/3, Smad 7 and collagen Ⅳ and the level of Smad 2/3 phosphorylation were observed.@*METHODS@#Lipofectin method was used to transfect TGF-β1 vector into MC, and the stably expressed TGF-β1 cell lines were selected by G418. The cells were divided into three groups. Control group:normal MC + RPMI 1640 + 10% normal rat serum; TGF-β1 group:stably expressed TGF-β1 MC + RPMI 1640 + 10% normal rat serum; CA group:stably expressed TGF-β1 MC + RPMI 1640 + 10% rat serum containing high CA. The experiments were repeated for five times. The contents of TGF-β1 and collagen Ⅳ in the culture medium were detected with ELISA, the expressions of mRNA and protein of TGF-β1, Smad 2/3, Smad 7 and the level of Smad 2/3 phosphorylation were detected by using real time quantitative polymerase chain reaction and Western blot.@*RESULTS@#The contents of TGF-β1 and collagen Ⅳ in the culture medium of stably-expressed TGF-β1 MC were increased significantly, and the CA could reverse the effects of TGF-β1. The expressions of mRNA and protein of TGF-β1, Smad 2/3 and the level of Smad 2/3 phosphorylation were increased significantly in TGF-β1 transfected MC, and CA could dramatically reduce the expressions of mRNA and protein of TGF-β1, Smad 2/3 and the level of Smad 2/3 phosphorylation. The high expression of TGF-β1 decreased the expression of Smad 7 mRNA and protein, and the CA could antagonize the effect of mRNA expression.@*CONCLUSIONS@#The MCs stably-expressed TGF-β1 can activate the TGF-β1/Smad signal pathway and increase the expression of collagen Ⅳ. CA can decrease the occurrence of diabetic nephropathy(DN) by reducing the production of collagen Ⅳ through inhibiting the TGF-β1/Smad signal pathway.

Identificação dos colágenos I, III, IV e α-SMA e participação dos miofibroblastos no processo fibrótico das endometroses equinas / Identification of collagens types I, III, IV and α-SMA and the participation of myofibroblasts in the fibrotic process in equine endometrosis

A endometrose é uma alteração degenerativa das glândulas uterinas e do estroma circundante, caracterizada pelo arranjo periglandular de miofibroblastos e pela deposição de matriz extracelular (ECM). O presente trabalho objetivou avaliar a expressão de colágenos tipos I, III e IV e α-actina de músculo liso (α-SMA) nas endometroses equinas, procurando esclarecer a participação dos miofibroblastos na progressão desses processos. Foram utilizadas 24 biópsias uterinas com diagnóstico de endometrose, recebidas pelo Serviço de Patologia Veterinária e de Reprodução Animal da FMVZ, Unesp, Botucatu, SP. Cortes histológicos foram submetidos às técnicas histoquímicas de tricrômico de Masson, picrosirius red sob luz polarizada e ácido periódico de Schiff (PAS) e imuno-histoquímicas para os três tipos de colágeno citados e α-SMA. Ainda, traçou-se um paralelo entre a técnica de picrosirius red e a imunomarcação dos colágenos tipos I e III. A análise histológica revelou que as fibras de colágeno denso correspondem ao colágeno tipo I, predominantes nas endometroses inativa e inativa destrutiva. As fibras de colágeno frouxo correspondem ao colágeno tipo III, predominantes nas endometroses ativas e ativas destrutivas. Nesses mesmos processos, a membrana basal revelou espessamento, aparentemente não relacionado ao colágeno tipo IV, e uma maior imunomarcação de miofibroblastos periglandulares em relação às endometroses inativa e inativa destrutiva. Dessa forma, nota-se que os miofibroblastos estão relacionados ao aumento na deposição de colágeno tipo III nos ninhos fibróticos ativos.(AU)

Endometriosis is a degenerative change of the uterine glands and surrounding stroma, characterized by periglandular arrangement of myofibroblasts and deposition of extracellular matrix (ECM). The aim of this study was to evaluate the expression of collagen type I, III and IV and α-smooth muscle actin (α-SMA) in equine endometriosis, and investigate the role of myofibroblasts in the progression of these processes. A parallel was made with histochemical techniques of Masson's trichrome, Picrosirius Red under polarized light and Periodic Acid-Schiff (PAS). Twenty four uterine biopsies received by the Veterinary Pathology Service and Animal Reproduction of FMVZ, UNESP, Botucatu, SP, were diagnosed with endometriosis. Histological analysis revealed that the orange dense collagen fibers correspond to type I collagen, being prevalent in inactive and inactive destructive endometriosis. The green loose collagen fibers correspond to type III collagen, and are predominant in active and active destructive endometriosis. In the same processes, a greater amount of periglandular myofibroblasts were observed in comparison to inactive and inactive destructive endometriosis. The presence of these cells in active processes are strongly related to an increased deposition of collagen type III in fibrotic nests. Regarding the basement membrane, the active destructive and active endometriosis shows thickening, apparently not related to an increase in expression of type IV collagen. The active destructive and inactive destructive endometriosis exhibited disruption areas in type IV collagen fibers. Thus, it is noted that the myofibroblasts are related to increased deposition of type III collagen in active fibrotic nests.(AU)

Study of a family affected with focal segmental glomerulosclerosis due to mutation of COL4A5 gene / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To analyze the clinicopathologic features and genetic mutation in a patient diagnosed with focal segmental glomerulosclerosis (FSGS).</p><p><b>METHODS</b>Clinicopathologic data of the patient, who was diagnosed with primary FSGS by renal biopsy, was collected. Mutations of FSGS-related genes were screened with next-generation sequencing. Suspected pathogenic mutation was verified with Sanger sequencing.</p><p><b>RESULTS</b>Next-generation sequencing detected a missense mutation (c.2215C to G, p.P739A) in exon 28 of the COL4A5 gene in the patient. The same mutation was also detected in his mother who was asymptomatic. Another missense mutation (c.2215C to T, p.P739S) in the same codon has been related with Alport syndrome.</p><p><b>CONCLUSION</b>The c.2215C to G (p.P739A) mutation may be one of pathogenic mutations underlying FSGS. This has provided further evidence for the phenotypic heterogeneity of COL4A5 gene mutations.</p>

Clinical and pathological features and the misdiagnosis of childhood Alport syndrome: a retrospective analysis of 91 cases / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To explore the clinical and pathological features and the diagnosis of childhood Alport syndrome (AS).</p><p><b>METHODS</b>A retrospective analysis was performed on clinical data of 91 children with AS.</p><p><b>RESULTS</b>Hematuria was observed in all 91 patients, of whom 86 were accompanied with proteinuria. Sixty-one children with X-Linked AS (XL-AS) had positive family history. Renal biopsy was performed on 82 children. Mild to moderate mesangial proliferation was observed in 74 cases. Small amounts of immune complexes deposits in the glomerular mesangial area were observed in 48 cases. Glomerular basement membrane (GBM) attenuation, thickening and layering were observed in 53 cases by electron microscopy (EM). In 63 cases receiving renal tissue type IV collagen α3 and α5 chain immunofluorescence detection, 58 were diagnosed with AS, including 53 cases of XL-AS and 5 cases of autosomal recessive AS. In 91 cases of AS, 58 were diagnosed as AS by renal tissue type IV collagen α3 and α5 chain immunofluorescence, 21 were diagnosed by EM, one was diagnosed by skin biopsy, and 12 were diagnosed by gene detection. Six novel mutations of COL4A5 gene were found. Forty-five cases were misdiagnosed before the diagnosis of AS. Forty-one of the 45 cases received steroids and/or immunosuppressant therapy.</p><p><b>CONCLUSIONS</b>The clinical manifestations and pathological changes are not specific in children with AS, resulting in a higher rate of misdiagnosis. Typical lesions of GBM under EM are only observed in a part of patients. There is a high novel mutation rate of COL4A5 in the detected AS children.</p>

Plasma D-dimer Can Effectively Predict the Prospective Occurrence of Ascites in Advanced Schistosomiasis Japonica Patients

China still has more than 30,000 patients of advanced schistosomiasis while new cases being reported consistently. D-dimer is a fibrin degradation product. As ascites being the dominating symptom in advanced schistosomiasis, the present study aimed to explore a prediction model of ascites with D-dimer and other clinical easy-achievable indicators. A case-control study nested in a prospective cohort was conducted in schistosomiasis-endemic area of southern China. A total of 291 patients of advanced schistosomiasis were first investigated in 2013 and further followed in 2014. Information on clinical history, physical examination, and abdominal ultrasonography, including the symptom of ascites was repeatedly collected. Result showed 44 patients having ascites. Most of the patients' ascites were confined in the kidney area with median area of 20 mm². The level of plasma D-dimer and pertinent liver function indicators were measured at the initial investigation in 2013. Compared with those without ascites, cases with ascites had significantly higher levels of D-dimer (0.71±2.44 μg/L vs 0.48±2.12 μg/L, P=0.005), as well ALB (44.5 vs 46.2, g/L) and Type IV collagen (50.04 vs 44.50 μg/L). Receiver operating characteristic curve analyses indicated a moderate predictive value of D-dimer by its own area under curve (AUC) of 0.64 (95% CI: 0.54–0.73) and the cutoff value as 0.81 μg/L. Dichotomized by the cutoff level, D-dimer along with other categorical variables generated a prediction model with AUC of 0.76 (95% CI: 0.68–0.89). Risks of patients with specific characteristics in the prediction model were summarized. Our study suggests that the plasma D-dimer level is a reliable predictor for incident ascites in advanced schistosomiasis japonica patients.

Avaliação da composição molecular da cápsula anterior da lente de cães idosos com catarata de alto risco / Molecular evaluation of the anterior lens capsule of older dogs suffering from high risk cataracts

Atualmente, a cápsula anterior e o epitélio da lente tem sido cada vez mais estudados, com o intuito de reduzir as possíveis complicações do pós-operatório da remoção da catarata, tal como a opacidade da cápsula posterior, alteração ocasionada principalmente pela diferenciação e migração das células do epitélio lenticular para a cápsula posterior da lente. O objetivo deste estudo foi analisar a composição molecular da cápsula anterior da lente pela técnica histoquímica de PAS (avaliação de proteoglicanos) e picrosirius red (avaliação de colágeno IV), em cães idosos com catarata diabética e não diabética do tipo hipermadura, submetidos ao uso ou não de azul de tripano a 0,1 % durante a facoemulsificação. Vinte e sete cães foram estudados, incluindo 21 fêmeas e 6 machos, de 8 a 12 anos de idade (média = 9,6 anos), de diversas raças e divididos em 2 grupos: GC (catarata hipermadura) e GCD (catarata diabética). Os resultados das análises realizadas mostraram que ambas as amostras, tanto as provenientes das cataratas hipermaduras, quanto das diabéticas, apresentam semelhante composição molecular de proteoglicanos e colágeno IV e isto independente da utilização de azul de tripano a 0,1 %. Conclui-se, portanto, que se os resultados obtidos forem decorrentes de alterações provocadas pelo rápido metabolismo da catarata diabética e pela cronicidade da catarata hipermadura sugere-se que o comprometimento da estrutura capsular seja de intensidade equivalente e, por consequência, que isto também possa prejudicar o metabolismo das células do epitélio anterior da lente, diminuindo assim a incidência da opacidade da cápsula posterior de cães com catarata diabética e hipermadura submetidos à facoemulsificação.(AU)

Nowadays, the anterior lens capsule and its epithelium have been being frequently studied aiming to reduce the incidence of posterior lens capsule opacity, a complication that frequently occurs after surgical removal of cataracts, due to epithelium cells differentiation and migration to the posterior pole. The objective of this study was to evaluate by histochemistry (PAS and picrosirius red) analysis two important molecular components of the anterior lens capsule (proteoglycans and type IV collagen) in older diabetic and non-diabetic dogs, with diabetic and hypermature cataracts, after phacoemulsification surgery utilizing 0.1% trypan blue or not. Twenty seven dogs, including 21 female and 6 male dogs, with ages varying from 8 to 12 years old (mean = 9.6 yo) of different breeds were studied. The animals were divided into 2 groups: GC (hypermature cataracts) and GCD (diabetic cataracts). Results showed that, besides their different pathophysiologies, both types of capsules studied (diabetic and hypermature ones) presented the same molecular composition of proteoglycans and type IV collagen, since no statistical significant differences were observed. In addition, 0.1% trypan blue was not capable to induce any other evident alteration for the samples. In conclusion, our findings suggest that, if the results consist in alteration induced by the aggressive metabolism of the diabetic cataract or the chronicity of the hypermature one, it is of the same intensity and independent of the use of 0.1% trypan blue. It is also possible to suggest that this alteration must be capable to compromise lens epithelium cell metabolism, which should probably favour future lens posterior capsule studies.(AU)

Avaliação da composição molecular da cápsula anterior da lente de cães idosos com catarata de alto risco / Molecular evaluation of the anterior lens capsule of older dogs suffering from high risk cataracts

Atualmente, a cápsula anterior e o epitélio da lente tem sido cada vez mais estudados, com o intuito de reduzir as possíveis complicações do pós-operatório da remoção da catarata, tal como a opacidade da cápsula posterior, alteração ocasionada principalmente pela diferenciação e migração das células do epitélio lenticular para a cápsula posterior da lente. O objetivo deste estudo foi analisar a composição molecular da cápsula anterior da lente pela técnica histoquímica de PAS (avaliação de proteoglicanos) e picrosirius red (avaliação de colágeno IV), em cães idosos com catarata diabética e não diabética do tipo hipermadura, submetidos ao uso ou não de azul de tripano a 0,1 % durante a facoemulsificação. Vinte e sete cães foram estudados, incluindo 21 fêmeas e 6 machos, de 8 a 12 anos de idade (média = 9,6 anos), de diversas raças e divididos em 2 grupos: GC (catarata hipermadura) e GCD (catarata diabética). Os resultados das análises realizadas mostraram que ambas as amostras, tanto as provenientes das cataratas hipermaduras, quanto das diabéticas, apresentam semelhante composição molecular de proteoglicanos e colágeno IV e isto independente da utilização de azul de tripano a 0,1 %. Conclui-se, portanto, que se os resultados obtidos forem decorrentes de alterações provocadas pelo rápido metabolismo da catarata diabética e pela cronicidade da catarata hipermadura sugere-se que o comprometimento da estrutura capsular seja de intensidade equivalente e, por consequência, que isto também possa prejudicar o metabolismo das células do epitélio anterior da lente, diminuindo assim a incidência da opacidade da cápsula posterior de cães com catarata diabética e hipermadura submetidos à facoemulsificação.

Nowadays, the anterior lens capsule and its epithelium have been being frequently studied aiming to reduce the incidence of posterior lens capsule opacity, a complication that frequently occurs after surgical removal of cataracts, due to epithelium cells differentiation and migration to the posterior pole. The objective of this study was to evaluate by histochemistry (PAS and picrosirius red) analysis two important molecular components of the anterior lens capsule (proteoglycans and type IV collagen) in older diabetic and non-diabetic dogs, with diabetic and hypermature cataracts, after phacoemulsification surgery utilizing 0.1% trypan blue or not. Twenty seven dogs, including 21 female and 6 male dogs, with ages varying from 8 to 12 years old (mean = 9.6 yo) of different breeds were studied. The animals were divided into 2 groups: GC (hypermature cataracts) and GCD (diabetic cataracts). Results showed that, besides their different pathophysiologies, both types of capsules studied (diabetic and hypermature ones) presented the same molecular composition of proteoglycans and type IV collagen, since no statistical significant differences were observed. In addition, 0.1% trypan blue was not capable to induce any other evident alteration for the samples. In conclusion, our findings suggest that, if the results consist in alteration induced by the aggressive metabolism of the diabetic cataract or the chronicity of the hypermature one, it is of the same intensity and independent of the use of 0.1% trypan blue. It is also possible to suggest that this alteration must be capable to compromise lens epithelium cell metabolism, which should probably favour future lens posterior capsule studies.

Collagen IV and laminin expression in squamous cellcarcinomas of lower lip and tongue / Expressão de colágeno IV e laminina em carcinomas de células escamosas de lábio inferior e língua

In this study, the expression of extra cellular matrix proteins was immunohisto chemically studied and compared with the histological grading of squamous cell carcinomas of the lower lip and tongue. Material and Methods: The lower lip carcinomas (n =12) and the tongue carcinomas (n = 12) were histopathologically graded according to Bryne’smethod. The immunohisto chemical technique used specific antibodies for collagen IV and laminin. Histopathological and immunohisto chemical analysis were carried-out at the invasive tumor front. Results: Most of the lower lip carcinomas(91.7%) were classified with lower scores and all tongue carcinomas (100%) with high-grade malignant scores (p < 0.01). Collagen type IV expression was absent in the peri tumoral basement membrane in 50% of lower lip carcinomas and in66. 7% of tongue carcinomas (p = 0.09). Laminin expression was absent in the peritumoral basement membrane in 66.7% of lower lip carcinomas and in 58.3% of tongue carcinomas (p = 0.48). When these two glycoproteins were expressed, they showed alinear, thin and discontinuous pattern and a weak intensity of expression. Conclusion: The high gradem alignancy score of the tongue carcinomas was associated with the pattern of expression of the matrix proteins studied. This suggested that tonguesquamous cell carcinomas have more invasive potential and more aggressive biological behaviorthan the lower lip carcinomas...

Neste estudo, a expressão das proteínas da matriz extracelular foi estuda da imunoisto quimicamente e comparada com a classificação histológica dos carcinomas de células escamosas do lábio inferior e língua. Material e Métodos: Os carcinomas de lábio inferior (n = 12)e os carcinomas de língua (n = 12) foram graduados histopatologicamente de acordo com o método de Bryne. A técnica de imunoistoquímica utilizou anticorpos específicos para colágeno IV e laminina. Análises histopatológica e imunoistoquímica foram conduzidas na frente invasiva tumoral. Resultados: A maioria dos carcinomas de lábio inferior (91,7%) foi classificada em baixo grau e todos os carcinomas de língua (100%) em alto grau de malignidade (p < 0,01). A expressão de colágeno tipo IV estava ausente na membrana basal peri tumoral em 50% dos carcinomas de lábio inferior e em 66,7% dos carcinomas de língua (p = 0,09). A expressão de laminina estava ausente na membrana basal peri tumoral em 66,7%dos carcinomas do lábio inferior e em 58,3% dos carcinomas de língua (p = 0,48). Quando estas duas glicoproteínas foram expressas, mostraram-se comum padrão linear, fino e descontínuo e uma fraca intensidade de expressão. Conclusão: O alto grau de malignidade dos carcinomas de língua associou-se com o padrão de expressão das proteínas de matriz estudadas. Isso sugere que carcinomas de células escamosas de língua têm comportamento biológico mais agressivo e potencial mais invasivo do que os carcinomas de lábio inferior...

Three days of intermittent stretching after muscle disuse alters the proteins involved in force transmission in muscle fibers in weanling rats

The aim of this study was to determine the effects of intermittent passive manual stretching on various proteins involved in force transmission in skeletal muscle. Female Wistar weanling rats were randomly assigned to 5 groups: 2 control groups containing 21- and 30-day-old rats that received neither immobilization nor stretching, and 3 test groups that received 1) passive stretching over 3 days, 2) immobilization for 7 days and then passive stretching over 3 days, or 3) immobilization for 7 days. Maximal plantar flexion in the right hind limb was imposed, and the stretching protocol of 10 repetitions of 30 s stretches was applied. The soleus muscles were harvested and processed for HE and picrosirius staining; immunohistochemical analysis of collagen types I, III, IV, desmin, and vimentin; and immunofluorescence labeling of dystrophin and CD68. The numbers of desmin- and vimentin-positive cells were significantly decreased compared with those in the control following immobilization, regardless of whether stretching was applied (P<0.05). In addition, the semi-quantitative analysis showed that collagen type I was increased and type IV was decreased in the immobilized animals, regardless of whether the stretching protocol was applied. In conclusion, the largest changes in response to stretching were observed in muscles that had been previously immobilized, and the stretching protocol applied here did not mitigate the immobilization-induced muscle changes. Muscle disuse adversely affected several proteins involved in the transmission of forces between the intracellular and extracellular compartments. Thus, the 3-day rehabilitation period tested here did not provide sufficient time for the muscles to recover from the disuse maladaptations in animals undergoing postnatal development.