Articles |
From the Department of Biochemistry and Molecular Biology (T.A.K., S.T.G., T.B.R.) and the Department of Physiology (T.A.K., W.J.L.), University of Maryland School of Medicine, Baltimore, and Dupont/Merck (J.J.O.), Research and Development, Glenholden Laboratory, Glenholden, Pa.
Correspondence to Dr Terry B. Rogers, Department of Biological Chemistry, University of Maryland School of Medicine, 108 N Greene St, Baltimore, MD 21201. E-mail trogers@umabnet.ab.umd.edu.
Abstract Although it is clear that gene transfection is a
potentially valuable approach in the study of cardiac cell function and
differentiation, classic transfection methods are limited by their poor
efficiencies in cardiac cells. Recent studies show that recombinant
replication-defective human adenovirus can transfect primary
cardiac cultures with near 100% efficiency. Since such recombinants
are time consuming to prepare, the goal of this study was to develop a
plasmid/viral transfection system that would capitalize on the
advantages of adenovirus. We have found that a "component system"
formed by preincubation of Ad5dl312 adenovirus,
poly-L-lysine, and an expression plasmid (lacZ
reporter gene under control of the human cytomegalovirus (HCMV) major
immediate early promoter) can transfect cultured cardiac cells. Optimal
conditions were determined by quantifying ß-galactosidase
expression. Histochemical analysis of cultures revealed that
the component system transfected 70% of the cells under these
conditions. LacZ-positive myocytes could be identified in
intact myocytes with the fluorescent substrate
C12-fluorescein
di-ß-galactopyranoside. Functional studies with such cells
indicated that contractile behavior was maintained in transfected
cardiocytes. Furthermore, the component system was used to
transfect a DNA vector expressing a
physiologically relevant protein, protein
kinase C
. In summary, this powerful and simple approach can promote
the expression of heterologous genes that can be studied at the
biochemical and cellular level in cardiac cells.
Key Words: transfection adenovirus myocytes gene expression
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