β2-Adrenergic receptor stimulation improves endothelial progenitor cell-mediated ischemic neoangiogenesis.

Authors:
Gennaro Galasso
Gennaro Galasso
Federico II University
Italy
Michele Ciccarelli
Michele Ciccarelli
University of Salerno
Fisciano | Italy
Daniela Sorriento
Daniela Sorriento
Department of Clinical Medicine
Italy
Teresa Strisciuglio
Teresa Strisciuglio
University of Naples Federico II
Rossella Luciano
Rossella Luciano
"Federico II" University of Naples Naples
Napoli | Italy

Circ Res 2013 Mar 15;112(7):1026-34. Epub 2013 Feb 15.

Department of Medicine and Surgery, University of Salerno, San Giovanni di Dio and Ruggi D'Aragona Academic Hospital, Cardiology Tower, Room S1, Largo Città d'Ippocrate, 84131 Salerno, Italy.

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.

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http://dx.doi.org/10.1161/CIRCRESAHA.111.300152DOI Listing

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March 2013
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Sorriento D et al.
Transl Med UNISA 2011
Evidence for circulating bone marrow-derived endothelial cells.
Shi Q et al.
Blood 1998

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