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- W2003993054 abstract "The influence of the diterpene, forskolin, was studied on adenylate cyclase activity in membranes of rat basophilic leukemia cells. Forskolin increased basal adenylate cyclase activity maximally 2-fold at 100 microM. However, adenylate cyclase activity stimulated via the stimulatory guanine nucleotide-binding protein, Ns, by fluoride and the stable GTP analog, guanosine 5'-O-(3-thiotriphosphate), was inhibited by forskolin. Half-maximal and maximal inhibition occurred at about 1 and 10 microM forskolin, respectively. The inhibition occurred without an apparent lag phase, whereas the enzyme stimulation by forskolin was preceded by a considerable lag period. The inhibition was not affected by treating intact cells or membranes with pertussis toxin and proteolytic enzymes, respectively, which have been shown in other cell types to prevent adenylate cyclase inhibition mediated by the guanine nucleotide-binding regulatory component, Ni. The forskolin inhibition of the stable GTP analog-activated adenylate cyclase was impaired by increasing the Mg2+ concentration and was reversed into a stimulation by Mn2+. Under optimal inhibitory conditions, forskolin even decreased basal adenylate cyclase activity. Finally, forskolin largely reduced the apparent affinity of the rat basophilic leukemia cell adenylate cyclase for its substrate, MgATP, which reduction resulted in an apparent inhibition at low MgATP concentrations and a loss of the inhibition at higher MgATP concentrations. The data indicate that forskolin can cause both stimulation and inhibition of adenylate cyclase and, furthermore, they suggest that the inhibition may not be mediated by the Ni protein, but may be caused by a direct action of forskolin at the adenylate cyclase catalytic moiety." @default.
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- W2003993054 title "Stimulation and inhibition of rat basophilic leukemia cell adenylate cyclase by forskolin" @default.
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- W2003993054 doi "https://doi.org/10.1016/0167-4889(85)90006-0" @default.
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