β2-adrenergic receptor stimulation improves endothelial progenitor cell-mediated ischemic neoangiogenesis

Gennaro Galasso, Roberta De Rosa, Michele Ciccarelli, Daniela Sorriento, Carmine Del Giudice, Teresa Strisciuglio, Chiara De Biase, Rossella Luciano, Raffaele Piccolo, Adele Pierri, Giuseppe Di Gioia, Nella Prevete, Bruno Trimarco, Federico Piscione, Guido Iaccarino

Research output: Contribution to journalArticle

Abstract

RATIONALE: Endothelial progenitor cells (EPCs) are present in the systemic circulation and home to sites of ischemic injury where they promote neoangiogenesis. β2-Adrenergic receptor (β2AR) plays a critical role in vascular tone regulation and neoangiogenesis. OBJECTIVE: We aimed to evaluate the role of β2AR on EPCs' function. METHODS AND RESULTS: We firstly performed in vitro analysis showing the expression of β2AR on EPCs. Stimulation of wild-type EPCs with β-agonist isoproterenol induced a significant increase of Flk-1 expression on EPCs as assessed by fluorescence-activated cell sorter. Moreover, β2AR stimulation induced a significant increase of cell proliferation, improved the EPCs migratory activity, and enhanced the EPCs' ability to promote endothelial cell network formation in vitro. Then, we performed in vivo studies in animals model of hindlimb ischemia. Consistent with our in vitro results, in vivo EPCs' treatment resulted in an improvement of impaired angiogenic phenotype in β2AR KO mice after induction of ischemia, whereas no significant amelioration was observed when β2AR knock out (KO) EPCs were injected. Indeed, wild-type-derived EPCs' injection resulted in a significantly higher blood flow restoration in ischemic hindlimb and higher capillaries density at histological analysis as compared with not treated or β2AR KO EPC-treated mice. CONCLUSIONS: The present study provides the first evidence that EPCs express a functional β2AR. Moreover, β2AR stimulation results in EPCs proliferation, migration, and differentiation, enhancing their angiogenic ability, both in vitro and in vivo, leading to an improved response to ischemic injury in animal models of hindlimb ischemia.

Original languageEnglish
Pages (from-to)1026-1034
Number of pages9
JournalCirculation Research
Volume112
Issue number7
DOIs
Publication statusPublished - Mar 29 2013

Keywords

  • β-adrenergic receptor
  • angiogenesis
  • endothelial progenitor cells

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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    Galasso, G., De Rosa, R., Ciccarelli, M., Sorriento, D., Del Giudice, C., Strisciuglio, T., De Biase, C., Luciano, R., Piccolo, R., Pierri, A., Di Gioia, G., Prevete, N., Trimarco, B., Piscione, F., & Iaccarino, G. (2013). β2-adrenergic receptor stimulation improves endothelial progenitor cell-mediated ischemic neoangiogenesis. Circulation Research, 112(7), 1026-1034. https://doi.org/10.1161/CIRCRESAHA.111.300152