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

Activation of a novel PKC isoform synergistically enhances D2L dopamine receptor-mediated sensitization of adenylate cyclase type 6.

Despite acutely inhibiting adenylate cyclase, prolonged activation of Galpha(i/o)-coupled receptors leads to a subsequent heterologous sensitization of adenylate cyclase responsiveness. Recently, protein kinase signaling and phosphorylation have been implicated in the sensitization of adenylate cyclase type 6 (AC6). To examine the sensitization specifically of AC6, we constructed human embryonic kidney cells (HEK293) cells stably expressing AC6 and the Galpha(i/o)-coupled D2L dopamine receptor. In contrast to observations in delta-opioid-expressing Chinese hamster ovary (CHO) cells that express endogenous AC6 and AC7, neither protein kinase C (PKC) nor tyrosine kinase inhibitors attenuated D2L receptor-mediated sensitization of AC6. Inhibition of Raf1 modestly inhibited the magnitude of D2L receptor-induced sensitization of AC6; however, activation of PKC robustly enhanced D2L receptor-mediated AC6 sensitization in a Raf1-dependent manner. These data indicate that, although PKC and Raf1 are not required for sensitization, activation of the PKC-Raf1 pathway robustly potentiated D2L receptor-mediated sensitization of AC6.[1]


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