Circulation Research, Vol 70, 193-198, Copyright © 1992 by American Heart Association

ARTICLES

Behavior of genes directly injected into the rat heart in vivo

PM Buttrick, A Kass, RN Kitsis, ML Kaplan and LA Leinwand
Department of Medicine, Albert Einstein College of Medicine, Bronx, N.Y.

Gene transfer can be achieved in the adult rat heart in vivo by direct injection of plasmid DNA. In this report we define the spatial and temporal limits of reporter gene expression after a single intracardiac injection. pRSVCAT (100 micrograms), in which the Rous sarcoma virus long terminal repeat is fused to the chloramphenicol acetyltransferase reporter gene, and p alpha MHCluc (100 micrograms), in which the alpha- cardiac myosin heavy chain promoter is fused to the firefly luciferase gene, were injected into hearts, and reporter gene activities were assayed at various times. Both chloramphenicol acetyltransferase and luciferase were detectable in 100% of the rats from 1 to 7 days, in 60% of the rats from 17 to 23 days, and in 30% of the rats from 38 to 60 days after injection. Reporter gene activity was largely limited to a 1- 2-mm region of the ventricle surrounding the injection site. Closed circular DNA was far more effective than linear DNA in transfecting cells in vivo. The relative strengths of three different promoters, Rous sarcoma virus long terminal repeat, alpha-myosin heavy chain, and alpha 1-antitrypsin, all fused to the luciferase reporter gene were determined. The constitutive viral promoter was approximately 20-fold more active than the cardiac-specific cellular promoter, and the liver- specific cellular promoter was not active at all in the cardiac environment. Thus, direct injection of genes into the heart offers a simple and powerful tool with which to assess the behavior of genes in vivo.(ABSTRACT TRUNCATED AT 250 WORDS)

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