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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

In vivo striatal dopamine release by M1 muscarinic receptors is induced by activation of protein kinase C.

Islet-activating protein was unilaterally microinjected into rat striatum, and a dialysis cannula was implanted into the same area under anesthesia. After 2 days, various agents were perfused continuously into the striatum through the dialysis membrane, under freely moving conditions. Islet-activating protein (2 micrograms/2 microliters) treatment alone did not change in vivo striatal dopamine (DA) release and metabolism, but completely abolished the increase of striatal DA release evoked in vivo by the M1-selective agonist McN-A-343 (10(-7) M). Forskolin (10(-5) M), an adenylate cyclase activator, increased DA release and showed an additive effect on the DA release evoked by McN-A-343. Polymyxin B, a rather selective inhibitor of protein kinase C, decreased DA release and completely blocked the effect of McN-A-343. These results suggest that in vivo striatal DA release elicited by M1 muscarinic receptors is coupled with interaction with a Go protein and is induced by activation of protein kinase C.[1]


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