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Journal of Cell Science, Vol 91, Issue 2 313-318, Copyright © 1988 by Company of Biologists

JOURNAL ARTICLES

In vitro modulation of endothelial fenestrae: opposing effects of retinoic acid and transforming growth factor beta

T Lombardi, R Montesano, MB Furie, SC Silverstein and L Orci
Institute of Histology and Embryology, University of Geneva Medical School, Switzerland.

Cultured endothelial cells isolated from fenestrated capillaries express many properties characteristic of their in vivo differentiated phenotype, including the formation of a limited number of fenestrae. In this study, we have investigated whether physiological factors that control cell differentiation might regulate the surface density of fenestrae in capillary endothelial cells. We have found that treatment of the cultures with retinoic acid (10 microM) induces a more than threefold increase in the surface density of endothelial fenestrae, whereas transforming growth factor beta (TGF beta) (2 ng ml-1) causes a sevenfold decrease in the surface density of these structures. These results show that the expression of endothelial fenestrae is susceptible to bidirectional modulation by physiological signals, and suggest that retinoids and TGF beta may participate in the regulation of fenestral density of capillary endothelium in vivo.


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© The Company of Biologists Ltd 1988