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DM Perez, MB DeYoung and RM Graham
Department of Cardiovascular Biology, Cleveland Clinic Foundation, Ohio 44195.
alpha 1-Adrenergic receptors (ARs) are members of the G protein-coupled receptor superfamily. alpha 1-AR subtypes mediate the effects of the sympathetic nervous system, especially those involved in cardiac homeostasis. To investigate signal transduction by a novel subtype (alpha 1D), which we recently cloned, and to compare it with that by the previously characterized alpha 1B-AR, we assessed the ability of each subtype to activate polyphosphoinositide (PI) metabolism, cAMP accumulation, and arachidonic acid release in Chinese hamster ovary (CHO) and COS-1 cells expressing these subtypes after stable or transient transfection, respectively. In COS-1 and CHO cells, both the alpha 1D- and alpha 1B-AR were found to couple to PI hydrolysis through a pertussis toxin-insensitive G protein. Both alpha 1-AR subtypes also increased intracellular cAMP by an indirect mechanism, although this effect was observed only in COS-1 cells and not in CHO cells. Interestingly, alpha 1-AR-stimulated arachidonic acid release was also demonstrated for both subtypes in COS-1 cells. This release was mediated through phospholipase A2 activation and involved a pertussis toxin-sensitive G protein. alpha 1-AR-stimulated arachidonic acid release was dependent upon extracellular calcium and was inhibited by 1 microM nifedipine. Inhibitors of protein kinase C, phospholipase C, and diacylglycerol lipase did not alter alpha 1-AR-stimulated release of arachidonic acid. These findings indicate that in COS-1 cells alpha 1- AR-stimulated arachidonic acid release is most likely coupled to dihydropyridine-sensitive L-type calcium channels via a pertussis toxin- sensitive G protein. The influx of extracellular calcium then stimulates phospholipase A2 to release arachidonic acid. alpha 1-AR- stimulated arachidonic acid release could also be demonstrated in CHO cells and was pertussis toxin sensitive but nifedipine insensitive. These cells were also unresponsive to Bay K8644, indicating a lack of voltage-sensitive calcium channels in CHO cells. Nevertheless, alpha 1- AR activation increased intracellular Ca2+ levels, as assessed by fura- 2 fluorescence studies. Neomycin blocked both alpha 1-AR-stimulated PI hydrolysis and increases in intracellular Ca2+ levels but did not inhibit the increase in arachidonic acid release. Taken together, these data indicate that in CHO cells alpha 1-ARs can couple directly to phospholipase A2 activation via a pertussis toxin-sensitive pathway. Thus, in these model systems we demonstrate for the first time that a single alpha 1-AR subtype can activate multiple distinct signal transduction pathways, in which receptor-effector coupling is modulated by distinct G proteins.
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