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Immunocytochemical studies of desmin and vimentin in pericapillary cells of chicken

T Fujimoto and SJ Singer

The composition of intermediate filaments in pericytes was examined by immunofluorescent and immunoelectron microscopic labeling of frozen sections of various chicken microvascular beds in situ. Pericytes in capillaries of cardiac muscle, exocrine pancreas, and kidney (peritubular capillary) were found to contain both desmin and vimentin. In some capillaries where pericytes do not exist, cells apposed to endothelial cells--the Ito cell in the hepatic sinusoid and the reticular cell in the splenic sinusoid--were shown to contain both of the intermediate filament proteins. In contrast, podocytes and mesangial cells around renal glomerular capillaries contained only vimentin. The presence of desmin supports the hypothesis that pericytes may have a contractile apparatus similar to that of vascular smooth muscle cells. Our results also revealed that even in microvascular beds where pericytes are not found, cells having both desmin and vimentin exist next to endothelial cells and may assume similar functions to pericytes.

Volume 35, Issue 10, pp. 1105-1115, 10/01/1987
Copyright © 1987 by The Histochemical Society


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