A morphometric study of the intestinal mucosa of rats submitted to omentoenteropexy.

CONTEXT: The omentoenteropexy technique was developed as an alternative method for intestinal neovascularization, due to the angiogenic properties of factors from the omentum. OBJECTIVES: This study investigated changes in intestinal villi heights and crypts depths due to surgical techniques: seromiotomy with and without omentoenteropexy. METHOD: Thirty rats were operated on, after being divided into three groups, namely GI, GII and GIII with 10 rats each. In the GI rats were submitted to omentoenteropexy; rats in GII were submitted only to a seromiotomy, and in the GIII only laparotomy. Sixty days after the first surgery, the animals were sacrificed and a segment of intestine was removed for histology using Masson's trichrome technique and morphometric study of intestinal mucosa. RESULTS: The histological findings showed that seromiotomy with or without omentoenteropexy increased the length of intestinal villi when compared with GIII (only laparotomy) (analysis of variance: P = 0.0068; GI 38.88 ± 4.17; GII 39.41± 6.33; GIII 31.85 ± 5.56; GI = GII P>0.05; GII>GIII P<0.05; GI>GIII P<0.001). CONCLUSION: No differences were demonstrated in relation to crypt depths between the groups (P = 0.60). Ongoing studies are being set forth by our group to add more data on the role of omentopexy as a tool to promote neovascularization and intestinal mucosal growth.

A morphometric study of the intestinal mucosa of rats submitted to omentoenteropexy / Estudo morfométrico da mucosa intestinal de ratos submetidos a omentoenteropexia

CONTEXT: The omentoenteropexy technique was developed as an alternative method for intestinal neovascularization, due to the angiogenic properties of factors from the omentum. OBJECTIVES: This study investigated changes in intestinal villi heights and crypts depths due to surgical techniques: seromiotomy with and without omentoenteropexy. METHOD: Thirty rats were operated on, after being divided into three groups, namely GI, GII and GIII with 10 rats each. In the GI rats were submitted to omentoenteropexy; rats in GII were submitted only to a seromiotomy, and in the GIII only laparotomy. Sixty days after the first surgery, the animals were sacrificed and a segment of intestine was removed for histology using Masson's trichrome technique and morphometric study of intestinal mucosa. RESULTS: The histological findings showed that seromiotomy with or without omentoenteropexy increased the length of intestinal villi when compared with GIII (only laparotomy) (analysis of variance: P = 0.0068; GI 38.88 ± 4.17; GII 39.41± 6.33; GIII 31.85 ± 5.56; GI = GII P>0.05; GII>GIII P<0.05; GI>GIII P<0.001). CONCLUSION: No differences were demonstrated in relation to crypt depths between the groups (P = 0.60). Ongoing studies are being set forth by our group to add more data on the role of omentopexy as a tool to promote neovascularization and intestinal mucosal growth.

CONTEXTO: a omentoenteropexia foi desenvolvida como técnica alternativa para a neovascularização intestinal, devido às propriedades angiogênicas de fatores provenientes do omento. OBJETIVO: Investigar as alterações nas alturas vilositárias e profundidades de cripta na mucosa intestinal de ratos submetidos a seromiotomia com e sem omentopexia. MÉTODOS: Trinta ratos foram operados após serem divididos em três grupos com 10 animais cada um. No grupo I (GI) os ratos foram submetidos seromiotomia seguida por omentoenteropexia; no grupo II (GII) foi realizada apenas a seromiotomia, e no grupo III (GIII) apenas a laparotomia. após 60 dias, os animais foram sacrificados e seus intestinos examinados histologicamente, corados pelo tricrômio de Masson, sendo realizado também estudo morfométrico da mucosa intestinal. RESULTADOS: O estudo mostrou que a altura vilositária é maior nos grupos submetidos a seromiotomia, com ou sem omentopexia, do que no grupo em que se realizou laparotomia apenas, porém entre os dois primeiros grupos não houve diferença significante (análise de variância: P = 0,0068; GI 38,88 ± 4,17; GII 39,41 ± 6,33; GIII 31,85 ± 5,56; GI = GII P>0,05; GII>GIII P<0,05; GI>GIII P<0,001). CONCLUSÕES: Não foram demonstradas diferenças quanto às profundidades de criptas entre os grupos (P = 0,60). Novos estudos estão sendo realizados por este grupo para acrescentar mais dados sobre o papel da omentopexia como forma de promover neovascularização e crescimento da mucosa intestinal.

Heparanase-2, syndecan-1, and extracellular matrix remodeling in colorectal carcinoma.

AIM: To propose a quantitative method to detect heparanase-2 (HPA2) and syndecan-1 (Syn-1) using immunohistochemistry in colorectal (colon and rectal) carcinomas compared with nonneoplastic tissues and evaluate the possible role of these molecules in tumor development and extracellular remodeling. METHODS: Cytoplasmic staining of HPA2 and Syn-1 was obtained by standard immunohistochemical reactions in 50 colorectal carcinoma and 20 nonneoplastic large bowels tissues. An image system was used to quantify the immunoexpression by digital computer-assisted method (Matos et al. 2006). The cutoff point for the immunohistochemistry variable was defined by sensibility and specificity curves. Statistical analysis was performed using SPSS version 13.0. RESULTS: HPA2 was over-expressed in colorectal cancer (131.1+/-24.9 o.u./microm) when compared with nonneoplastic tissues (27.9+/-12.2 o.u./microm) (P<0.0001). However, an opposite correlation was observed between Syn-1 and tumor presence, where colorectal tissues expressed lower Syn-1 proteoglycan compared with nonneoplastic tissues, respectively (39.2+/-17.8 o.u./microm) and (102.2+/-25.2 o.u./microm) (P<0.0001). CONCLUSION: A methodology with high sensitivity and specificity is proposed with a cutoff value for HPA2 and Syn-1 in the immunohistochemistry assay to define the presence of tumor. It was demonstrated for the first time in the literature that HPA2 is over-expressed in colorectal carcinoma tissues compared with nonneoplastic tissues. HPA2 over-expression could be possibly related to Syn-1 shedding despite the fact that HPA2 does not present enzymatic activity as HPA1.

Esofagite de refluxo em crianças: estudo histológico e morfométrico / Reflux esophagitis in children: histological and morphometric study

Racional - Refluxo gastroesofágico é afecçäo relativamente comum na infância e pode causar morbidade, havendo porém poucos estudos histológicos e morfométricos em biopsias esofágicas de crianças. Objetivo - Estudar aspectos histológicos e morfométricos da esofagite de refluxo em crianças. Material e Métodos - Foram analisadas 26 biopsias esofágicas (média de idade de 4,1 ± 3,4 anos), com diagnóstico histológico prévio de esofagite de refluxo. Refluxo gastroesofágico também foi confirmado pela radiologia em 18, pHmetria em 5 e cintilografia em 3 pacientes. O sexo masculino predominou (84,6 por cento); vômitos pós-prandiais (76,9 por cento) e broncopneumonia de repetiçäo foram os sintomas mais freqüentes. O grupo controle constou de sete crianças assintomáticas para refluxo gastroesofágico, cuja causa da morte foi meningococcemia (quatro casos) e cardiopatia congênita (três casos) (média de idade de 2,5 ± 2,3 anos). Utilizaram-se as técnicas histoquímicas hematoxilina-eosina e ácido periódico de Schiff para avaliar infiltrado inflamatório, espessura do epitélio, da camada basal e o comprimento papilar. A morfometria foi feita por meio de sistema digital conectado ao software Pro-Image. Para análise estatística utilizou-se o teste t de Student, teste de Mann-Whitney, exato de Fisher e coeficiente de correlaçäo de Pearson. Resultados - Espessura epitelial e da camada basal, comprimento papilar absoluto e relativo foram significativamente maiores no grupo de crianças com esofagite em relaçäo ao grupo controle. Eosinófilos, neutrófilos e "balloon cells" näo foram observados no grupo controle. Capilares intra-epiteliais foram observados em 11 casos de esofagite de refluxo (diâmetro médio de 59 mim), estando ausentes no grupo controle. Conclusäo - Na esofagite de refluxo houve aumento da espessura epitelial, da camada basal, do comprimento papilar (em número absoluto e relativo) em relaçäo ao controle. Houve, ainda, correlaçäo linear positiva entre espessura epitelial total, espessura da camada basal e comprimento papilar, denotando maior "turnover" das células epiteliais. Polimorfonucleares eosinófilos, neutrófilos e "balloon cells" estavam presentes somente em biopsias de crianças com esofagite, sendo portanto, indicadores específicos desta afecçäo

[Reflux esophagitis in children: histological and morphometric study]. / Esofagite de refluxo em crianças: estudo histológico e morfométrico.

BACKGROUND: Gastroesophageal reflux disease is a frequent cause of morbidity in childhood, including esophagitis and recurrent respiratory symptoms; however histological and morphometric studies in esophageal biopsies of children are scarce. AIM: To study histological and morphometric findings in children with reflux esophagitis. PATIENTS AND METHODS: We studied 26 esophageal biopsies of children (mean age: 4.1 years +/- 3.4) with reflux esophagitis, which prevailed in boys (84.6%); post-prandial vomiting (76.9%) and repetitive bronchopneumonia (38.5%) were the most frequent symptoms. The diagnosis was made by X-ray in 18, by pH evaluation in 5 and by scintilography in 3 patients. The control group was formed by seven children without reflux symptoms who died from meningococcemia or congenital heart malformation (mean age: 2.5 years +/- 2.3). Histological variables were studied by hematoxylin-eosin and periodic acid of Schiff stain, inflammatory infiltrate, epithelial and basal layer thickness, papillary length and its ratio with the thickness of the epithelium. Morphometry was performed at a digital system connected to pro-image software. Student's t test, Mann-Whitney test, Fisher and Pearson's correlation methods were used for the statistical analysis. RESULTS: Epithelial and basal zone thickness, papillary length and its rate with thickness of epithelium, among the reflux group patients were higher than the control group. Eosinophils, neutrophils and "balloon cells" were not observed in the control group. Intraepithelial capillaries occurred in 11 cases in the reflux group (mean diameter: 59 mum). CONCLUSION: Epithelial and basal zone thickness, papillary length and its ratio with thickness of epithelium, resulted greater in the gastroesophageal reflux group than in the control group. There was a direct correlation between thickness of epithelium, basal zone thickness and papillary length, showing increased epithelial cell turnover. Eosinophils, neutrophils and "balloon cells" were observed only in patients with gastroesophageal reflux, thus serving as specific markers of this disease.