Protein kinase C activity in neonatal cultured rat cardiomyocytes supplemented with docosahexaenoic acid. |
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Authors: | S Hrelia P L Biagi E Turchetto C A Rossi A Bordoni |
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Affiliation: | Dipartimento di Biochimica G. Moruzzi, University of Bologna, Italy. |
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Abstract: | In vitro studies have indicated that the 1-stearoyl, 2-arachidonyl diacylglycerol (DAG) is the most effective one for the activation of protein kinase C, although many other DAGs having a different fatty acid composition are active, but to a different extent. Using cultures of neonatal rat ventricular cells, grown in a medium enriched in docosahexaenoic acid (DHA), we previously obtained a cell population that, after alpha 1-adrenoceptor stimulation, produced a DHA enriched DAG. In this study, we have tested the "in vivo" ability of this modified DAG as protein kinase C activator, demonstrating a lower but more persistent translocation of the enzyme from cytosol to particulate fraction in the DHA treated cells. The differences in the PKC activation pattern could be explained by a different metabolism of the DHA enriched DAG by DAG kinase. |
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