Contribution to the study of collagen degradation



Document title: Contribution to the study of collagen degradation
Journal: Jornal brasileiro de patologia e medicina laboratorial
Database: PERIÓDICA
System number: 000297039
ISSN: 1676-2444
Authors: 1

1
Institutions: 1Centro de Pesquisas Goncalo Moniz, Laboratorio de Patología Experimental, Salvador, Bahia. Brasil
Year:
Volumen: 38
Number: 4
Pages: 325-332
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, analítico
English abstract The rate and morphology of collagen degradation were comparatively analyzed in rats with "early" and "late" carbon tetrachloride-induced hepatic fibrosis, during three different periods after discontinuation of the drug. Treatment with CCl4 lasted for eight weeks for the group of early fibrosis and 12 weeks for the late fibrosis group. Fibrosis gradually disappeared, but when quantitative methods were applied, the amount of collagen degradation and removal in early and late fibrosis did not reach statistical significance. The light microscope and ultrastructural changes were also qualitatively similar in both cases. Probably some long-lasting effects to the liver, induced by the drug, prevented early hepatic fibrosis from undergoing the characteristic ultrastructural changes seen during "acute" collagen degradation, as compared to other experimental models of hepatic fibrosis, after the causal agent is totally removed. Present findings suggest that not only the age of fibrosis but also the overall damage inflicted to the organ are limiting factors in the process of collagen degradation and removal
Portuguese abstract O grau e a morfologia da degradação do colágeno foram comparativamente analisados em ratos com fibrose hepática recente (tratamento de oito semanas com tetracloreto de carbono) e tardia (igual tratamento por 12 semanas), e acompanhados após a suspensão da administração da droga. O desaparecimento da fibrose (quando quantitativamente avaliada) foi gradual e semelhante para ambos os grupos. As modificações vistas à microscopia de luz e ao microscópio eletrônico foram também semelhantes. Estes resultados inesperadamente negativos diferem de outros modelos de fibrose hepática e sugerem que o grau de agressão ao parênquima hepático seja um fator limitante da degradação da fibrose que se segue à remoção do agente causal. Assim sendo, não apenas a idade da fibrose, mas o estado geral de alteração do órgão atingido influenciam a degradação e remoção do colágeno
Disciplines: Medicina
Keyword: Medicina experimental,
Colágena,
Degradación,
Cirrosis hepática,
Fibrosis,
CCl4,
Inducción,
Ratas
Keyword: Medicine,
Experimental medicine,
Collagen,
Degradation,
Liver cirrhosis,
Fibrosis,
CCl4,
Induction,
Rats
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