Journal of Regenerative Medicine ISSN: 2325-9620

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Research Article, J Regen Med Vol: 2 Issue: 2

Targeted MicroRNA Interference Promotes Postnatal Cardiac Cell Cycle Re-Entry

Yiqiang Zhang1,2*, Noriko Matsushita2, Tamar Eigler2 and Eduardo Marbán2*
1Department of Medicine/ Cardiology, University of Washington, USA
2Cedars-Sinai Heart Institute, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
Corresponding authors : Yiqiang Zhang
Department of Medicine/Cardiology, University of Washington, 850 Republican St, Seattle, WA 98109, USA
E-mail: [email protected]
Eduardo Marbán,
Cedars-Sinai Heart Institute, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
E-mail: [email protected]
Received: March 22, 2013 Accepted: June 20, 2013 Published: June 25, 2013
Citation: Zhang Y, Matsushita N, Eigler T, Marbán E (2013) Targeted MicroRNA Interference Promotes Postnatal Cardiac Cell Cycle Re-Entry. J Regen Med 2:2. doi:10.4172/2325-9620.1000108

Abstract

Targeted MicroRNA Interference Promotes Postnatal Cardiac Cell Cycle Re-Entry

Mammalian heart cells undergo a marked reduction in proliferative activity shortly after birth, and thereafter grow predominantly by hypertrophy. Our understanding of the molecular mechanisms underlying cardiac maturation and senescence is based largely on studies at the whole-heart level. Here, we investigate the molecular basis of the acquired quiescence of purified neonatal and adult cardiomyocytes, and use microRNA interference as a novel strategy to promote cardiomyocyte cell cycle re-entry. Expression of cyclins and cyclin-dependent kinases (CDKs) and positive modulators were down-regulated, while CDK inhibitors and negative cell cycle modulators were up-regulated during postnatal maturation of cardiomyocytes. The expression pattern of microRNAs also changed dramatically, including increases in miR- 29a, miR-30a and miR-141. Treatment of neonatal cardiomyocytes with miRNA inhibitors anti-miR-29a, anti-miR-30a, and antimiR- 141 resulted in more cycling cells and enhanced expression of Cyclin A2 (CCNA2). Thus, targeted microRNA interference can reactivate postnatal cardiomyocyte proliferation.

Keywords: Cell cycle; Cardiomyocytes; Cyclins; microRNA; Western blot

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