Matriz extracelular de pericardio fibroso porcino : estudo morfologico e bioquimico / Extracellular matrix of porcine fibrous pericardium: morphological and biochemical study

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Pericardial tissue has been used to construct bioprostheses employed in the repair different kinds of injuries. However, calcification and mechanical failure have been the main causes of limited durability of cardiac bioprostheses constructed with bovine pericardium. In the course of this work a study has been conducted on the porcine fibrous pericardium and its microscopic structure and its biochemical nature. The general morphology and the architecture of the collagen and elastic fibers have been studied in sectioned tissue and also total assemblies, stained by diverse histochemical methods and analyzed by conventional light, polarizing light, fluorescence and confocal microscopy. Biochemical study of the pericardial matrix was conducted according to pertinent procedures. The pericardium was shown as a highly cellularized tissue with a vascular tree very ramified and collagen fibers arranged in multidirectionally oriented layers. A predominant direction was verified, with a larger number of fibers obliquely oriented, starting at the lower central region towards high-lateral-left relatively to the heart. A discreet predominance of collagen fibers is the base-apex direction was verified in the right-front region of the pericardium. Extracellular matrix with little metachromasy was observed, indicating small quantities of acid glycosaminoglycans. Fine elastic fibrils were observed, intimately associated to collagen fibers, interlaced in various directions or parallel to themselves. No differences were found between proteins extracted from the right or left regions and between fresh or frozen material. The quantities of extracted GAGs were too small to be detected by the method used. The SDS-PAGE showed proteins with values of apparent molecular mass between 11 and 109 kDa included two polydisperse bands around 71 and 85kDa. The ectrophoretic analysis showed that the found GAG is possibly dermatan sulfate

ASSUNTO(S)

matriz extracelular proteoglycans colageno elastic fibers fibras elasticas pericardium extracellular matrix pericardio proteoglicanos collagen

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