Abstract | PURPOSE OF REVIEW: It has been known for decades that in order to grow, tumors need to activate quiescent endothelial cells to form a functional vascular network, a process termed 'angiogenesis'. However, the molecular determinants that reverse this endothelial quiescence to facilitate pathological angiogenesis are not yet completely understood. This review examines a critical regulatory switch at the level of Ras that activates this angiogenic switch process and the role that microRNAs play in this process. RECENT FINDINGS: In the last few years, microRNAs, a new class of small RNA molecules, have emerged as key regulators of several cellular processes, including angiogenesis. MicroRNAs such as miR-126, miR-296, and miR-92a have been shown to play important roles in angiogenesis. We recently described how miR-132, an angiogenic growth factor inducible microRNA in the endothelium, facilitates pathological angiogenesis by downregulating p120RasGAP, a molecular brake for Ras. Importantly, targeting miR-132 with a complementary, synthetic antimicroRNA restored the brake and decreased angiogenesis and tumor burden in multiple tumor models. Taken together, emerging evidence suggests a central role for microRNAs downstream of multiple growth factors in regulating endothelial proliferation, migration, and vascular patterning. SUMMARY: Further research into miR-132-p120RasGAP biology and more broadly, microRNA regulation of Ras pathways in the endothelium will not only advance our understanding of angiogenesis but also provide opportunities for therapeutic intervention.
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Authors | Sudarshan Anand, David A Cheresh |
Journal | Current opinion in hematology
(Curr Opin Hematol)
Vol. 18
Issue 3
Pg. 171-6
(May 2011)
ISSN: 1531-7048 [Electronic] United States |
PMID | 21423013
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Review)
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Chemical References |
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Topics |
- Animals
- Endothelium, Vascular
(metabolism)
- Humans
- MicroRNAs
(genetics, metabolism)
- Neovascularization, Pathologic
(genetics)
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