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The 21-day postnatal rat ventricular cardiac muscle cell in culture as an experimental model to study adult cardiomyocyte gene expression

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Abstract

The purpose of this study was to develop and characterize a cardiomyocyte culture system for use as an experimental model to study the mechanism(s) by which cardiac muscle cells permanently exit the cell cycle during early neonatal life. Ventricular cardiomyocytes, isolated by retrograde perfusion of hearts from 21-day-old and adult rats, were compared through 10 days of culture. Expression patterns of genes encoding developmentally programmed proteins were determined to be similar between cardiomyocytes cultured from 21-day-old and adult rats, using the reverse transcription polymerase chain reaction. A lacZ-expressing reporter gene was used to test the efficiency of gene delivery in cultured cardiomyocytes. Transfections using cationic liposomes yielded 24 ± 7, 25 ± 7 and 10 ± 1% cardiomyocytes positive for β-galactosidase activity in cultured 1-day, 21-day and adult cardiomyocytes, respectively. Direct needle microinjection resulted in 48 ± 7, 35 ± 6 and 37 ± 5% cardiomyocytes positive for enzymatic activity in 1-day, 21-day and adult cardiomyocytes, respectively. Cell cycle-specific cDNA arrays were used to analyze the expression pattern of cell cycle-related genes in 12-O-tetradecanoyl-phorbol-13-acetate (TPA)- and non-TPA-treated cultured 21-day cardiomyocytes. Based on the similarity of cultured 21-day to adult ventricular cardiomyocytes and their high transfection efficiencies, we propose the use of cultured cardiomyocytes from 21-day-old rat ventricles as an experimental model system for the study of adult cardiomyocyte gene expression and cell cycle machinery.

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Authors and Affiliations

  1. Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, New Orleans, LA, 70112, USA

    May L. Lam, Manuela Bartoli & William C. Claycomb

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  1. May L. Lam
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  2. Manuela Bartoli
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  3. William C. Claycomb
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Correspondence to William C. Claycomb.

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Lam, M.L., Bartoli, M. & Claycomb, W.C. The 21-day postnatal rat ventricular cardiac muscle cell in culture as an experimental model to study adult cardiomyocyte gene expression. Mol Cell Biochem 229, 51–62 (2002). https://doi.org/10.1023/A:1017999216277

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