Abstract
This is the first study to demonstrate that the interaction between beta-adrenoceptor activation, and the production of inflammatory mediators can be modulated in opposite ways by two inflammatory stimuli, namely, protein kinase C (PKC)-activating phorbol myristyl acetate (PMA) and lipopolysaccharide (LPS). We provided evidence that isoproterenol treatment, when combined with phorbol ester increased the production of tumor necrosis factor-alpha, interleukin-12, and nitric oxide in murine macrophages, as well as in human monocytes and differentiated PLB-985 cells, while in agreement with earlier findings, it decreased inflammatory mediator production in combination with LPS stimulation. The contrasting effect on inflammatory mediator production, shown for the PMA and LPS activated cells was accompanied by parallel changes in activation of ERK1/2 and p38 MAPKs. Thus, isoproterenol significantly increased MAPK activation (phosphorylation) in PMA-treated cells and, conversely, it decreased the activation of extracellular signal regulated kinase 1/2 (ERK1/2) and p38 in LPS-stimulated cells. The opposing effects of isoproterenol on LPS-induced versus PMA-induced mediator production and the concurrent changes in MAPK activation highli...Continue Reading
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