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Fields Modulate Opioid Peptide Gene Expression In Myocardial Cells (abstract)
METHODS: Prodynorphin gene expression was investigated in adult rat myocytes exposed to PMF by the aid of RNase protection and nuclear run-off transcription assays. In PMF-exposed nuclei, nuclear protein kinase C (PKC) activity was followed by measuring the phosphorylation rate of the acrylodan-labeled MARCKS peptide. The effect of PMF on the subcellular distribution of different PKC isozymes was assessed by immunoblotting. A radioimmunoassay procedure coupled to reversed-phase high performance liquid chromatography was used to monitor the expression of dynorphin B.
RESULTS: Here, we show that PMF enhanced myocardial opioid gene expression and that a direct exposure of isolated myocyte nuclei to PMF markedly enhanced prodynorphin gene transcription, as in the intact cell. The PMF action was mediated by nuclear PKC activation but occurred independently from changes in PKC isozyme expression and enzyme translocation. PMF also led to a marked increase in the synthesis and secretion of dynorphin B.
CONCLUSIONS: The present
findings demonstrate that an opioid gene is activated by myocyte exposure to
PMF and that the cell nucleus and nuclear embedded PKC are a crucial target
for the PMF action. Due to the wide ranging importance of opioid peptides in
myocardial cell homeostasis, the current data may suggest consideration for
potential biological effects of PMF in the cardiovascular system.