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• W2038897306 abstract "Alpha3-containing (alpha 3*) and alpha 7 nicotinic acetylcholine receptors (nAChRs) are expressed in human IMR-32 neuroblastoma cells and implicated in Ca(2+) signaling. In this study, we investigated the intracellular Ca(2+) transient generation evoked by selective activation of alpha 3* (agonist potency rank order: epibatidine>varenicline>nicotine approximately cytisine) and alpha 7 (rank order in the presence of alpha 7 positive allosteric modulator or PAM: A-795723>NS6784 approximately PNU-282987) using, respectively, varenicline and NS6784 (+alpha 7 PAM) by Ca(2+) imaging. Effects of inhibitors of nAChRs (MLA and mecamylamine), ER Ca(2+) ATPase pump (CPA and thapsigargin), Ca(2+)-induced Ca(2+) release (ryanodine and dantrolene), Ca(2+) channels (nitrendipine, diltiazem, and Cd(2+)), and removal of extracellular Ca(2+) were examined. alpha 7 PAMs, when tested in the presence of NS6784, were more active when added first, followed by the agonist, than in the reverse order. Removal of extracellular Ca(2+) - but not CPA, thapsigargin, ryanodine, dantrolene, nitrendipine, diltiazem, or Cd(2+) - diminished the alpha 7 agonist-evoked Ca(2+) transients. In contrast, only diltiazem and nitrendipine and removal of extracellular Ca(2+) inhibited the alpha 3*-mediated Ca(2+) transients. The differential effect of diltiazem and nitrendipine versus Cd(2+) was due to direct inhibition of alpha 3* nAChRs as revealed by Ca(2+) imaging in HEK-293 cells expressing human alpha 3 beta 4 nAChRs and patch clamp in IMR-32 cells. In summary, this study provides evidence that alpha 3* and alpha 7 nAChR agonist-evoked global Ca(2+) transient generation in IMR-32 cells does not primarily involve voltage-dependent Ca(2+) channels, intracellular Ca(2+) stores, or Ca(2+)-induced Ca(2+) release. These mechanisms may, however, be still involved in other forms of nAChR-mediated Ca(2+) signaling." @default.
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• W2038897306 date "2010-10-01" @default.
• W2038897306 modified "2023-10-16" @default.
• W2038897306 title "α3 and α7 nAChR-mediated Ca2+ transient generation in IMR-32 neuroblastoma cells" @default.
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• W2038897306 doi "https://doi.org/10.1016/j.neuint.2010.06.005" @default.
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