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Lipopolysaccharide-induced redistribution of myocardial connexin43 is associated with increased macrophage infiltration in both normotensive and spontaneously hypertensive rats.
Journal of Physiology and Pharmacology : An Official Journal of the Polish Physiological Society 2018 October
We investigated whether changes in gap junction alpha-1 protein (Cx43) expression may be associated with macrophage-induced inflammation in the heart of spontaneously hypertensive rats (SHR). To examine mutual interactions of macrophage infiltration with Cx43 expression and redistribution, we applied a bolus of bacterial lipopolysaccharide (LPS) to SHR and age-matched normotensive Wistar rats. The results demonstrated association of Cx43 downregulation with increased infiltration of cardiac CD-68 macrophages and upregulation of nuclear factor-κB (NFκB) and tumor necrosis factor-α (TNF-α) expression in the heart of SHR. LPS application to SHR caused further degradation and redistribution of Cx43 accompanied with extensively increased macrophage infiltration and NFκB and TNF-α expression. LPS administration to Wistar rats resulted in elevation of cardiac CD-68 macrophages but it did not significantly affect total Cx43 expression. Our results are suggestive of regulation of Cx43 expression with macrophages-related inflammation in the heart of SHR. The data also indicate that SHR can be more sensitive to LPS than are normotensive rats.
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