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pubmed-article:15927395pubmed:abstractTextThe neuropeptide calcitonin gene-related peptide (CGRP) binds to a subpopulation of dorsal root ganglion (DRG) neurons, elevates intracellular calcium, and causes inward currents in about 30% of lumbar DRG neurons. Using whole-cell patch clamp recordings, we found in the present study that application of CGRP to isolated and cultured DRG neurons from the adult rat enhances voltage-gated TTX-resistant (TTX-R) Na(+) inward currents in about 30% of small- to medium-sized DRG neurons. During CGRP, peak densities of Na(+) currents increased significantly. CGRP shifted the membrane conductance of the CGRP-responsive cells towards hyperpolarization without changing the slope of the peak conductance curve. The effect of CGRP was blocked by coadministration of CGRP8-37, an antagonist at the CGRP receptor. The effect of CGRP was also blocked after bath application of PKA14-22, a membrane-permeant blocker of protein kinase A, and PKC19-31, a PKC inhibitor, in the recording pipette. These data show pronounced facilitatory effects of CGRP on TTX-R Na(+) currents in DRG neurons which are mediated through CGRP receptors and intracellular pathways involving protein kinases A and C. Thus, in addition to prostaglandins, CGRP is another mediator that affects TTX-R Na(+) currents which are thought to occur mainly in nociceptive DRG neurons.lld:pubmed
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pubmed-article:15927395pubmed:articleTitleCalcitonin gene-related peptide enhances TTX-resistant sodium currents in cultured dorsal root ganglion neurons from adult rats.lld:pubmed
pubmed-article:15927395pubmed:affiliationInstitut für Physiologie, University of Jena, Teichgraben 8, D-07740 Jena, Germany.lld:pubmed
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