Extracellular-added ADP-ribose increases intracellular free Ca2+ concentration through Ca2+ release from stores, but not through TRPM2-mediated Ca2+ entry, in rat beta-cell line RIN-5F - PubMed (original) (raw)

doi: 10.1254/jphs.scj06001x. Epub 2006 Jun 10.

Affiliations

Free article

Extracellular-added ADP-ribose increases intracellular free Ca2+ concentration through Ca2+ release from stores, but not through TRPM2-mediated Ca2+ entry, in rat beta-cell line RIN-5F

Masakazu Ishii et al. J Pharmacol Sci. 2006 Jun.

Free article

Abstract

Intracellular ADP-ribose is an activator of TRPM2, which is a Ca2+-permeable channel and mediates H2O2-induced cell death, in the TRPM2-expressing rat beta-cell line RIN-5F. We examined the effect of extracellular-added ADP-ribose on intracellular Ca2+ concentration in RIN-5F cells. ADP-ribose induced Ca2+ release from the thapsigargin-sensitive Ca2+ store, but not Ca2+ entry across the plasma membrane. A phospholipase C (PLC) inhibitor and a non-specific IP3 receptor inhibitor blocked its Ca2+ release. H2O2-induced Ca2+ entry through TRPM2 was not affected by extracellular ADP-ribose. These findings suggest that extracellular-added ADP-ribose induces Ca2+ release through the PLC-IP3 pathway and does not act as a TRPM2 activator.

PubMed Disclaimer

Similar articles

Cited by

Publication types

MeSH terms

Substances

LinkOut - more resources