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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Contrasting effects of PACAP and carbachol on [Ca2+]i and inositol phosphates in human neuroblastoma NB-OK-1 cells.

The effects of PACAPs on [Ca2+]i were compared to those of carbachol in human neuroblastoma NB-OK-1 cells. PACAP(1-27) and PACAP(1-38) increased [Ca2+]i in a biphasic manner: a transient rise and a secondary plateau. The transient phase reflected the mobilization of [Ca2+]i pool(s) via the inositol phosphate pathway. The modest sustained plateau required extracellular Ca2+. Carbachol also increased [Ca2+]i in a biphasic manner, but it mobilized intracellular Ca2+ pool(s) with a higher efficacy than PACAPs, then greatly increased Ca2+ entry, this being accompanied by a more marked and prolonged elevation of IP3 and IP4 than with PACAPs. It is likely that cAMP-mediated phosphorylations due to PACAPs facilitated desensitization at the PACAP receptor-phospholipase C level, so that there was less Ca2+ handling through PACAP receptors than with muscarinic M1 receptors.[1]

References

  1. Contrasting effects of PACAP and carbachol on [Ca2+]i and inositol phosphates in human neuroblastoma NB-OK-1 cells. Delporte, C., Van Praet, A., Herchuelz, A., Winand, J., Christophe, J. Peptides (1993) [Pubmed]
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