Affordable Access

Differential regulation of TRPM channels governs electrolyte homeostasis in the C. elegans intestine.

Authors
  • Teramoto, Takayuki
  • Lambie, Eric J
  • Iwasaki, Kouichi
Type
Published Article
Journal
Cell Metabolism
Publisher
Elsevier
Publication Date
May 01, 2005
Volume
1
Issue
5
Pages
343–354
Identifiers
PMID: 16054081
Source
Medline
License
Unknown

Abstract

The transient receptor potential (TRP) channels are implicated in various cellular processes, including sensory signal transduction and electrolyte homeostasis. We show here that the GTL-1 and GON-2 TRPM channels regulate electrolyte homeostasis in the C. elegans intestine. GON-2 is responsible for a large outwardly rectifying current of intestinal cells, and its activity is tightly regulated by intracellular Mg(2+) levels, while GTL-1 mainly contributes to appropriate Mg(2+) responsiveness of the outwardly rectifying current. We also used nickel cytotoxicity to study the function of these channels. Both GON-2 and GTL-1 are necessary for intestinal uptake of nickel, but GTL-1 is continuously active while GON-2 is inactivated at higher Mg(2+) levels. This type of differential regulation of intestinal electrolyte absorption ensures a constant supply of electrolytes through GTL-1, while occasional bursts of GON-2 activity allow rapid return to normal electrolyte concentrations following physiological perturbations.

Report this publication

Statistics

Seen <100 times