期刊
JOURNAL OF MEMBRANE BIOLOGY
卷 191, 期 3, 页码 201-207出版社
SPRINGER
DOI: 10.1007/s00232-002-1057-x
关键词
ADP-ribose; beta-NAD; TRPM2; CRI-G1 cell; calcium
The response to intracellular ADP-ribose in the rat CRI-G1 insulinoma cell line was studied using a patch-clamp method. Dialysis of ADP-ribose into cells induced a response in a dose-dependent manner. The reversal potentials in various solutions showed that the ADP-ribose-gated channel was a Ca2+-permeable nonselective cation channel. In inside-out recordings, ADP-ribose and beta-NAD induced responses in the same patch. The single-channel current-voltage relationships for ADP-ribose- and beta-NAD-induced responses were almost identical, indicating that ADP-ribose and beta-NAD activated the same channel. The physiological properties of the ADP-ribose-gated channel are similar to those we reported previously for the cloned transient receptor potential channel TRPM2. Moreover, RT-PCR analysis showed that TRPM2 was abundantly expressed in CRI-G1 cells, suggesting that the ADPribose-gated channel represents the native TRPM2 channel in CRI-G1 cells. These results suggest that ADP-ribose can be an endogenous modulator of Ca2+ influx through the TRPM2 channel into CRI-G1 cells.
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