R-Ras-Akt axis induces endothelial lumenogenesis and regulates the patency of regenerating vasculature

Fangfei Li, Junko Sawada and Masanobu Komatsu ()
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Fangfei Li: Sanford Burnham Prebys Medical Discovery Institute at Lake Nona
Junko Sawada: Sanford Burnham Prebys Medical Discovery Institute at Lake Nona
Masanobu Komatsu: Sanford Burnham Prebys Medical Discovery Institute at Lake Nona

Nature Communications, 2017, vol. 8, issue 1, 1-15

Abstract: Abstract The formation of endothelial lumen is fundamental to angiogenesis and essential to the oxygenation of hypoxic tissues. The molecular mechanism underlying this important process remains obscure. Here, we show that Akt activation by a Ras homolog, R-Ras, stabilizes the microtubule cytoskeleton in endothelial cells leading to endothelial lumenogenesis. The activation of Akt by the potent angiogenic factor VEGF-A does not strongly stabilize microtubules or sufficiently promote lumen formation, hence demonstrating a distinct role for the R-Ras-Akt axis. We show in mice that this pathway is important for the lumenization of new capillaries and microvessels developing in ischemic muscles to allow sufficient tissue reperfusion after ischemic injury. Our work identifies a role for Akt in lumenogenesis and the significance of the R-Ras-Akt signaling for the patency of regenerating blood vessels.

Date: 2017
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DOI: 10.1038/s41467-017-01865-x

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