Neuron. 1992 May;8(5):907-14.

Inhibition of N- and L-type calcium channels by muscarinic receptor activation in rat sympathetic neurons.

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Department of Physiology and Biophysics, University of Washington, Seattle 98195.

Abstract

Modulation of N- and L-type Ca2+ channels by oxotremorine-M (oxo-M) acting on muscarinic receptors and norepinephrine (NE) acting on alpha-adrenergic receptors was studied in superior cervical ganglion neurons. Oxo-M depresses dihydropyridine-augmented tail currents in whole-cell recordings, whereas NE does not. This modulation of L-type Ca2+ channels by oxo-M is abolished by adding 20 mM BAPTA to the pipette solution. Oxo-M, acting via a diffusible messenger, reduces the probability of opening of single N- and L-type channels recorded in cell-attached patches. We conclude that a diffusible messenger signaling pathway activated by oxo-M inhibits both N- and L-type Ca2+ channels, whereas a membrane-delimited pathway activated by oxo-M and NE inhibits only N-type Ca2+ channels.

PMID:: 1316767; [PubMed - indexed for MEDLINE]

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Inhibition of N- and L-type calcium channels by muscarinic receptor activation in rat sympathetic neurons.

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