PMID: 6171066Sep 1, 1980Paper

Angiogenesis by capillary endothelial cells in culture

Transactions of the Ophthalmological Societies of the United Kingdom
J Folkman, C C Haudenschild

Abstract

Capillary endothelial cells cloned from bovine and human tissues were grown in long-term culture. In the presence of tumor-conditioned medium, capillary tubes formed when the cells became confluent. Each tube began as a longitudinal vacuole in one cell and then appeared to be extruded and connected from one cell to the next. Branches appeared, and a capillary network developed over a period of 2 to 3 weeks. By light and electron microscopy, the tubes were nearly identical to capillaries in vivo. These experiments: (1) Demonstrate angiogenesis in vitro; (2) Show that all the information necessary to develop an entire capillary in vitro can be expressed by one cell type; (3) Suggest a mechanism for lumen formation by capillaries in vivo; (4) Offer a possibility of distinguishing between direct and indirect angiogenesis factors.

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