Organized type I collagen influences endothelial patterns during "spontaneous angiogenesis in vitro": planar cultures as models of vascular development

In Vitro Cellular & Developmental Biology. Animal
R B VernonE H Sage

Abstract

Selected strains of vascular endothelial cells, grown as confluent monolayers on tissue culture plastic, generate flat networks of cellular cords that resemble beds of capillaries--a phenomenon referred to as "spontaneous angiogenesis in vitro". We have studied spontaneous angiogenic activity by a clonal population (clone A) of bovine aortic endothelial cells to identify processes that mediate the development of cellular networks. Confluent cultures of clone A endothelial cells synthesized type I collagen, a portion of which was incorporated into narrow, extracellular cables that formed a planar network beneath the cellular monolayer. The collagenous cables acted as a template for the development of cellular networks: flattened, polygonal cells of the monolayer that were in direct contact with the cables acquired spindle shapes, associated to form cellular cords, and became elevated above the monolayer. Networks of cables and cellular cords did not form in a strain of bovine aortic endothelial cells that did not synthesize type I collagen, or when traction forces generated by clone A endothelial cells were inhibited with cytochalasin D. In a model of cable development, tension applied by a confluent monolayer of endothelial cel...Continue Reading

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