Jaw1/LRMP increases Ca2+ influx upon GPCR stimulation with heterogeneous effect on the activity of each ITPR subtype

Sci Rep. 2022 Jun 8;12(1):9476. doi: 10.1038/s41598-022-13620-4.

Abstract

Ca2+ influx upon G protein-coupled receptor (GPCR) stimulation is observed as a cytosolic Ca2+ concentration oscillation crucial to initiating downstream responses including cell proliferation, differentiation, and cell-cell communication. Although Jaw1 is known to interact with inositol 1,4,5-triphosphate receptor (ITPRs), Ca2+ channels on the endoplasmic reticulum, the function of Jaw1 in the Ca2+ dynamics with physiological stimulation remains unclear. In this study, using inducible Jaw1-expressing HEK293 cells, we showed that Jaw1 increases Ca2+ influx by GPCR stimulation via changing the Ca2+ influx oscillation pattern. Furthermore, we showed that Jaw1 increases the Ca2+ release activity of all ITPR subtypes in a subtly different manner. It is well known that the Ca2+ influx oscillation pattern varies from cell type to cell type, therefore these findings provide an insight into the relationship between the heterogeneous Ca2+ dynamics and the specific ITPR and Jaw1 expression patterns.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Calcium / metabolism
  • Calcium Signaling*
  • Cytosol / metabolism
  • Endoplasmic Reticulum* / metabolism
  • HEK293 Cells
  • Humans
  • Inositol 1,4,5-Trisphosphate Receptors* / metabolism
  • Membrane Proteins* / metabolism
  • Receptors, G-Protein-Coupled* / metabolism

Substances

  • IRAG2 protein, human
  • Inositol 1,4,5-Trisphosphate Receptors
  • Membrane Proteins
  • Receptors, G-Protein-Coupled
  • Calcium