MicroRNA-132-mediated loss of p120RasGAP activates the endothelium to facilitate pathological angiogenesis

Sudarshan Anand, Bharat K. Majeti, Lisette M. Acevedo, Eric A. Murphy, Rajesh Mukthavaram, Lea Scheppke, Miller Huang, David J. Shields, Jeffrey N. Lindquist, Philip E. Lapinski, Philip D. King, Sara M. Weis, David A. Cheresh

Research output: Contribution to journalArticle

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Abstract

Although it is well established that tumors initiate an angiogenic switch, the molecular basis of this process remains incompletely understood. Here we show that the miRNA miR-132 acts as an angiogenic switch by targeting p120RasGAP in the endothelium and thereby inducing neovascularization. We identified miR-132 as a highly upregulated miRNA in a human embryonic stem cell model of vasculogenesis and found that miR-132 was highly expressed in the endothelium of human tumors and hemangiomas but was undetectable in normal endothelium. Ectopic expression of miR-132 in endothelial cells in vitro increased their proliferation and tube-forming capacity, whereas intraocular injection of an antagomir targeting miR-132, anti-miR-132, reduced postnatal retinal vascular development in mice. Among the top-ranking predicted targets of miR-132 was p120RasGAP, which we found to be expressed in normal but not tumor endothelium. Endothelial expression of miR-132 suppressed p120RasGAP expression and increased Ras activity, whereas a miRNA-resistant version of p120RasGAP reversed the vascular response induced by miR-132. Notably, administration of anti-miR-132 inhibited angiogenesis in wild-type mice but not in mice with an inducible deletion of Rasa1 (encoding p120RasGAP). Finally, vessel-targeted nanoparticle delivery of anti-miR-132 restored p120RasGAP expression in the tumor endothelium, suppressed angiogenesis and decreased tumor burden in an orthotopic xenograft mouse model of human breast carcinoma. We conclude that miR-132 acts as an angiogenic switch by suppressing endothelial p120RasGAP expression, leading to Ras activation and the induction of neovascularization, whereas the application of anti-miR-132 inhibits neovascularization by maintaining vessels in the resting state.

Original languageEnglish (US)
Pages (from-to)909-914
Number of pages6
JournalNature Medicine
Volume16
Issue number8
DOIs
StatePublished - Aug 2010
Externally publishedYes

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p120 GTPase Activating Protein
Pathologic Neovascularization
MicroRNAs
Endothelium
Tumors
Switches
Neoplasms
Intraocular Injections
Retinal Vessels
Endothelial cells
Hemangioma
Stem cells
Tumor Burden
Heterografts
Nanoparticles
Blood Vessels
Endothelial Cells
Chemical activation
Breast Neoplasms

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Anand, S., Majeti, B. K., Acevedo, L. M., Murphy, E. A., Mukthavaram, R., Scheppke, L., ... Cheresh, D. A. (2010). MicroRNA-132-mediated loss of p120RasGAP activates the endothelium to facilitate pathological angiogenesis. Nature Medicine, 16(8), 909-914. https://doi.org/10.1038/nm.2186

MicroRNA-132-mediated loss of p120RasGAP activates the endothelium to facilitate pathological angiogenesis. / Anand, Sudarshan; Majeti, Bharat K.; Acevedo, Lisette M.; Murphy, Eric A.; Mukthavaram, Rajesh; Scheppke, Lea; Huang, Miller; Shields, David J.; Lindquist, Jeffrey N.; Lapinski, Philip E.; King, Philip D.; Weis, Sara M.; Cheresh, David A.

In: Nature Medicine, Vol. 16, No. 8, 08.2010, p. 909-914.

Research output: Contribution to journalArticle

Anand, S, Majeti, BK, Acevedo, LM, Murphy, EA, Mukthavaram, R, Scheppke, L, Huang, M, Shields, DJ, Lindquist, JN, Lapinski, PE, King, PD, Weis, SM & Cheresh, DA 2010, 'MicroRNA-132-mediated loss of p120RasGAP activates the endothelium to facilitate pathological angiogenesis', Nature Medicine, vol. 16, no. 8, pp. 909-914. https://doi.org/10.1038/nm.2186
Anand, Sudarshan ; Majeti, Bharat K. ; Acevedo, Lisette M. ; Murphy, Eric A. ; Mukthavaram, Rajesh ; Scheppke, Lea ; Huang, Miller ; Shields, David J. ; Lindquist, Jeffrey N. ; Lapinski, Philip E. ; King, Philip D. ; Weis, Sara M. ; Cheresh, David A. / MicroRNA-132-mediated loss of p120RasGAP activates the endothelium to facilitate pathological angiogenesis. In: Nature Medicine. 2010 ; Vol. 16, No. 8. pp. 909-914.
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