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  • Title: Phorbol ester effects on neurotransmission: interaction with neurotransmitters and calcium in smooth muscle.
    Author: Baraban JM, Gould RJ, Peroutka SJ, Snyder SH.
    Journal: Proc Natl Acad Sci U S A; 1985 Jan; 82(2):604-7. PubMed ID: 2857490.
    Abstract:
    Stimulation of the phosphatidylinositol cycle by neurotransmitters generates diacylglycerol, an activator of protein kinase C, which may regulate some forms of neurotransmission. Phorbol esters, potent inflammatory and tumor-promoting compounds, also activate protein kinase C. We demonstrate potent and selective effects of phorbol esters on smooth muscle, indicating a role for protein kinase C in neurotransmission. In rat vas deferens and dog basilar artery, phorbol esters synergize with calcium to mimic the contractile effects of neurotransmitters that act through the phosphatidylinositol cycle. In guinea pig ileum and rat uterus, phorbol esters block contractions produced by these neurotransmitters.
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