| Literature DB >> 12571754 |
K Inamura1, Y Sano, S Mochizuki, H Yokoi, A Miyake, K Nozawa, C Kitada, H Matsushime, K Furuichi.
Abstract
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 b-NAD induced responses in the same patch. The single-channel current-voltage relationships for ADP-ribose- and b-NAD-induced responses were almost identical, indicating that ADP-ribose and b-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 ADP-ribose-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.Entities:
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Year: 2003 PMID： 12571754 DOI： 10.1007/s00232-002-1057-x
Source DB: PubMed Journal: J Membr Biol ISSN： 0022-2631 Impact factor: 1.843