A novel angiogenesis model using co-culture of endothelial and interstitial cells was developed, in which bovine capillary endothelial cells (BCEC) formed capillary-like structure on the monolayer of interstitial cells (like smooth muscle cells) isolated from rat skeletal muscle. The capillary formation of BCEC occurred even under serum-free conditions. Insulin stimulated the capillary growth under serum-free condition, but not BCEC growth in the single culture system. These results suggested that the insulin effect on the capillary growth was brought about indirectly through the interstitial cells, and that this co-culture system may be useful for the study of angiogenesis (especially in skeletal muscle).
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