Immunoexpression of cyclooxygenase-1 and -2 in ulcerative colitis

Ulcerative colitis (UC) is a disease of the colon and rectum characterized by a nonspecific chronic inflammation mediated by the concerted response of cellular and humoral events. Prostaglandins are synthesized by cyclooxygenase (COX)-1 and -2 and exhibit both pro- and anti-inflammatory activity. To evaluate COX-1 and COX-2 immunoexpression in 42 cases of UC and to correlate it with clinicopathological parameters, COX-1 and COX-2 expression was investigated by the immunohistochemistry method. Only patients with all pertinent clinical and evolutive data as well as with adequate biopsy material were included in the study. Fifteen samples of colorectal adenocarcinoma and 14 of large bowel with no histological changes were used for positive and negative controls, respectively. UC patients showed COX-1 immunoreactivity in epithelial cells in 29 percent of the cases and in inflammatory cells in 43 percent. COX-2 positivity in epithelial and inflammatory cells was found in 69 percent of the samples. The comparison between UC and the control groups revealed that the UC group had significantly more positive cases for COX-1 and COX-2 in inflammatory cells. Immunohistochemistry allowed the identification of COX-1 and COX-2 expression in epithelial and inflammatory cells in UC biopsies. No significant difference between COX-1 and COX-2 immunoreactivity in epithelial and inflammatory cells was observed regarding the clinicopathological parameters. COX-2 presented low expression in normal colon and high expression in colorectal adenocarcinoma. COX-2 might play a role in the pathophysiologic processes of inflammatory bowel disease and the development of neoplasia. Treatment with selective COX-2 inhibitors might be an additional option for therapy.

Parasite and egg burden, hepatic collagen and histologic pattern of liver granulomas in selection III high and low antibody responder mice infected with Schistosoma mansoni

Selection III mice have particular immunological characteristics: they are high (H III) or low (L III) antibody producer animals, yet both lines display similar T cell responses and macrophage activities. We submittedthese mice to infection with Schistosoma mansoni to assess in vivo parasite and egg burden, hepatic collagen and cellular composition of granulomas in both lines. Titration of anti-Schistosoma IgG by ELISA showed remarkably higher values inH III line, at both studied periods (8th and 12th weeks post-infection). Nevertheless, the number of adult worms recovered from the portal system was similar inboth lines, being not associated with anti-Schistosoma antibody levels. There isan increase in hepatic collagen from the 8th to the 12th weeks post-infection, which is paralleled by an increase in the number of eggs in the liver. This association apparently occurs at the same radio in H III and L III animals. The most important difference found between the two lines was the outstanding contrast interms of volume and eosinophil counts in the granulomas, with lesions from H IIImice clearly being larger and containing more of these cells than LIII lesions

Estudo histoquímico do músculo esquelético no alcoolismo crônico / Histochemical study of the skeletal muscle in chronic alcoholism

Vinte e dois pacientes alcoólatras crônicos foram submetidos a exame clínico neurológico e biópsia muscular. Eles apresentavam graus variáveis de fraqueza muscular proximal (cinturas escapular e pélvica), tendo um deles evoluído com quadro agudo de miopatia (avaliaçäo pelo 'Manual Muscle Test', MMT). A principal alteraçäo histológica observada é melhor evidenciada pela coloraçäo da ATPase: atrofia muscular (95,3%), predominando nas fibras do tipo II A (71,4%) e, em 76% dos casos, alteraçäo da imagem em mosaico à custa de agrupamentos de fibras musculares de mesmo tipo histoquímico ('type-grouping'). Secundariamente, em 63% dos casos, observa-se proliferaçäo mitocondrial e conseqüente acúmulo lipídico intra-sarcoplasmático. No caso de instalaçäo aguda da fraqueza muscular, o substrato anátomo-patológico é completamente diferente: presença de miosite, predominantemente intersticial, caracterizada por infiltrado linfoplasmocitário e numerosas imagens de necrose tipo degeneraçäo cérea de Zencker. Baseando-se em critérios histológicos, nossos dados sugerem que: a principal gênese da fraqueza muscular observada em pacientes alcoólatras crônicos tem natureza neurogência (polineuropatia alcoólica); a atuaçäo tóxica direta do etanol sobre o músculo esquelético está intimamente relacionada ao metabolismo mitocondrial; a chamada miopatia aguda alcoólica tenha etiologia inflamatória, do tipo viral

Suporte nutricional em pacientes hospitalizados: experiencia de um ano. / Nutritional support in hospitalized patients: experience of 1 year

A equipe de nutricao clinica da Escola Paulista de Medicina (EPM) atende aos pedidos de interconsulta das diversas enfermarias do Hospital Sao Paulo que estao sob a responsabilidade de diferentes disciplinas da EPM. De outubro de 1982 a outubro de 1983, a equipe avaliou o estado nutricional e indicou a conduta de suporte nutricional em 89 doentes. Quando a alimentacao enteral foi a indicada, a dieta formulada foi adaptada a cada caso,segundo as necessidades energeticas e, quando necessario, com restricoes de nutrientes, tais como proteina, sodio e agua. A prevalencia de desnutricao proteico-calorica foi de 68%. A nutricao enteral foi indicada em 80 pacientes, sendo instalada em 57 dos quais 24 receberam-na, durante a hospitalizacao, por tempo medio de 32 dias e 4 receberam-na no hospital e, depois da alta, em seus domicilios, por tempo medio de 46 dias.Esses pacientes mostraram melhora do estado nutricional e nao apresentaram complicacoes decorrentes da terapeutica nutricional aplicada