In Vivo, Cardiac-Specific Knockdown of a Target Protein, Malic Enzyme- 1, in Rat via Adenoviral Delivery of DNA for Non-Native miRNA

Author(s): J. Michael O’Donnell, Asha Kalichira, Jian Bi, Edward D. Lewandowski

Journal Name: Current Gene Therapy

Volume 12 , Issue 6 , 2012

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This study examines the feasibility of using the adenoviral delivery of DNA for a non-native microRNA to suppress expression of a target protein (cytosolic NADP+-dependent malic-enzyme 1, ME1) in whole heart in vivo, via an isolated-heart coronary perfusion approach. Complementary DNA constructs for ME1 microRNA were inserted into adenoviral vectors. Viral gene transfer to neonatal rat cardiomyocytes yielded 65% suppression of ME1 protein. This viral package was delivered to rat hearts in vivo (Adv.miR_ME1, 1013 vp/ml PBS) via coronary perfusion, using a cardiacspecific isolation technique. ME1 mRNA was reduced by 73% at 2-6 days post-surgery in heart receiving the Adv.miR_ME1. Importantly, ME1 protein was reduced by 66% (p<0.0002) at 5-6 days relative to sham-operated control hearts. Non-target protein expression for GAPDH, calsequestrin, and mitochondrial malic enzyme, ME3, were all unchanged. The non-target isoform, ME2, was unchanged at 2-5 days and reduced at day 6. This new approach demonstrates for the first time significant and acute silencing of target RNA translation and protein content in whole heart, in vivo, via non-native microRNA expression.

Keywords: Heart, RNA interference, gene therapy, microRNA, siRNA, heart, RNA interference, gene therapy, microRNA, siRNA, calsequestrin, mitochondrial malic enzyme, ME3

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Article Details

Year: 2012
Published on: 17 October, 2012
Page: [454 - 462]
Pages: 9
DOI: 10.2174/156652312803519760
Price: $65

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