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Effects of bFGF, TGFalpha and TGFbeta on cultured mesenchymal cells of rabbit phalli were investigated. A remarkable cell proliferation reaching confluency was only obtained from the media containing bFGF by the first week of culture. By subsequent 4 weeks culture using such confluent cells in the media containing bFGF, TGFalpha or TGFbeta, respectively, cells cultured in the media containing bFGF showed an active transformation to endothelial precursor cells determined by positive immunoreactions for factor VIII-related antigen at 2 weeks. By electron microscopy, such vasoformative cells appeared in contact with each other, occasionally forming a solid cell cord. The use of Matrigel's basement membrane matrix (Matrigel) in each culture bed promoted the capillary ingrowth, implying that certain extracellular matrix (ECM) components included in Matrigel may accelerate the formation of neocapillaries. Enhancement in the production of ECM components and transformation to smooth muscle cells determined by positive immunoreactions for actin were also seen in cells cultured in the media containing TGFalpha and TGFbeta, respectively. The present results indicate that the above growth factors play crucial roles in the differentiation of the rabbit cavernous body.

archives of histology and cytology

The Effects of Basic Fibroblast Growth Factor, Transforming Growth Factor-.ALPHA. and Transforming Growth Factor-.BETA. on Mesenchymal Cells in the Rabbit Phallus: An in-vitro Study.