Distinct, convergent second messenger pathways modulate neuronal calcium currents.

M Diversé-Pierluissi; K Dunlap

doi:10.1016/0896-6273(93)90175-q

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Distinct, convergent second messenger pathways modulate neuronal calcium currents.

M Diversé-Pierluissi·K Dunlap

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Abstract

Norepinephrine (NE) and gamma-aminobutyric acid (GABA) inhibit N-type calcium channels in embryonic chick sensory neurons. We demonstrate here that the modulatory actions of the two transmitters are mediated through distinct biochemical pathways. Intracellular application of the pseudosubstrate inhibitor for protein kinase C blocks the inhibition produced by NE (and the protein kinase C activator oleoylacetylglycerol), but not that produced by GABA. Calcium current inhibition produced by oleoylacetylglycerol occludes inhibition by subsequent application of NE; GABA-mediated inhibition, however, is not eliminated by prior activation of protein kinase C. These results demonstrate that multiple biochemical pathways converge to control N-type calcium channel function.

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Animals Calcium Chick Embryo Diglycerides Electric Conductivity Ethers, Cyclic Nerve Tissue Proteins Neurons Neurotransmitter Agents Okadaic Acid Phosphoric Monoester Hydrolases Protein Kinase C Second Messenger Systems Journal Article Research Support, U.S. Gov't, P.H.S.

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M Diversé-Pierluissi, K Dunlap. 1993. Distinct, convergent second messenger pathways modulate neuronal calcium currents.. https://doi.org/10.1016/0896-6273(93)90175-q

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