Medical College of Wisconsin
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Re-evaluation of the role of calcium homeostasis endoplasmic reticulum protein (CHERP) in cellular calcium signaling. J Biol Chem 2013 Jan 04;288(1):355-67 PMID: 23148228 PMCID: PMC3537033

Abstract

Changes in cytoplasmic Ca(2+) concentration, resulting from activation of intracellular Ca(2+) channels within the endoplasmic reticulum, regulate several aspects of cellular growth and differentiation. Ca(2+) homeostasis endoplasmic reticulum protein (CHERP) is a ubiquitously expressed protein that has been proposed as a regulator of both major families of endoplasmic reticulum Ca(2+) channels, inositol 1,4,5-trisphosphate receptors (IP(3)Rs) and ryanodine receptors (RyRs), with resulting effects on mitotic cycling. However, the manner by which CHERP regulates intracellular Ca(2+) channels to impact cellular growth is unknown. Here, we challenge previous findings that CHERP acts as a direct cytoplasmic regulator of IP(3)Rs and RyRs and propose that CHERP acts in the nucleus to impact cellular proliferation by regulating the function of the U2 snRNA spliceosomal complex. The previously reported effects of CHERP on cellular growth therefore are likely indirect effects of altered spliceosomal function, consistent with prior data showing that loss of function of U2 snRNP components can interfere with cell growth and induce cell cycle arrest.

Author List

Lin-Moshier Y, Sebastian PJ, Higgins L, Sampson ND, Hewitt JE, Marchant JS

Author

Jonathan S. Marchant PhD Chair, Professor in the Cell Biology, Neurobiology and Anatomy department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Amino Acid Sequence
Calcium
Calcium Signaling
Cell Cycle
Cell Membrane
Cytoplasm
DNA-Binding Proteins
Endoplasmic Reticulum
Gene Expression Regulation
Homeostasis
Humans
Inositol 1,4,5-Trisphosphate Receptors
Jurkat Cells
Membrane Proteins
Molecular Sequence Data
Mutation
Nucleosomes
RNA Interference
RNA-Binding Proteins
Ribonucleoproteins
Ryanodine Receptor Calcium Release Channel
Spliceosomes
Subcellular Fractions



View this publication's entry at the Pubmed website PMID: 23148228
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