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PMID: 19430204 Published · ppublish English Journal Article Research Support, N.I.H., Extramural

p38 MAP kinase-dependent regulation of the expression level and subcellular distribution of heterogeneous nuclear ribonucleoprotein A1 and its involvement in cellular senescence in normal human fibroblasts.

RNA biology ·Vol. 6 ·No. 3 ·2009-00-00 ·Pages 293-304

Shimada N, Rios I, Moran H, Sayers B, Hubbard K

Abstract

Heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1) is a RNA binding protein that plays important role in the biogenesis of mRNA, such as alternative splicing and mRNA stability. We have previously demonstrated that hnRNP A1 has diminished protein levels and shows cytoplasmic accumulation in senescent human diploid fibroblasts. Recent reports showed that p38 MAP kinase (p38 MAPK), a member of the MAP kinase family is necessary and sufficient for the cytoplasmic accumulation of hnRNP A1 by stress stimuli such as osmotic shock. p38 MAP kinase has been shown to be involved in cell proliferation and the induction of senescence in response to extracellular stimuli. However, the relationship between hnRNP A1 and p38 MAPK and the roles of hnRNP A1 in cellular senescence have not yet been elucidated. Here we show that hnRNP A1 forms a complex with phospho-p38 MAPK in vivo. Inhibition of p38 MAPK activity with SB203580 elevated hnRNP A1 protein levels and prohibited the cytoplasmic accumulation of the protein, but not hnRNP A2, in senescent cells. The phosphorylation level of hnRNP A1 was elevated in senescent cells. Reduction of hnRNP A1 and A2 levels by siRNA transfection induced a senescence-like morphology and elevated the level of F-actin, a marker of senescence. These results suggest that the expression levels and subcellular distribution of hnRNP A1 are regulated in a p38 MAPK-dependent manner, probably via its phosphorylation. Our results also suggest that hnRNP A2 in addition to hnRNP A1 may play a role in establishing the senescence phenotype.

MeSH Terms
Cell Cycle Cell Line Cellular Senescence Fibroblasts/cytology,drug effects,metabolism Gene Expression Regulation Heterogeneous Nuclear Ribonucleoprotein A1 Heterogeneous-Nuclear Ribonucleoprotein Group A-B/genetics,metabolism Humans Phosphorylation Protein Binding Protein Kinase Inhibitors/pharmacology p38 Mitogen-Activated Protein Kinases/antagonists & inhibitors,metabolism
Chemicals
Heterogeneous Nuclear Ribonucleoprotein A1 Heterogeneous-Nuclear Ribonucleoprotein Group A-B Protein Kinase Inhibitors hnRNPA1 protein, human p38 Mitogen-Activated Protein Kinases
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Shimada Naoko
City College of New York, City University of New York, New York, NY 10031, USA.
Rios Ileana
Moran Heriberto
Sayers Brendan
Hubbard Karen
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Article Info
Journal
RNA biology
Abbr.
RNA Biol
ISSN
1555-8584
DOI
10.4161/rna.6.3.8497
Published
2009-00-00
Epub
2009-00-20
Pages
293-304
Language
English
Region
United States
NLM ID
101235328
PMCID
PMC2939323
Subset
IM
Grants
NIGMS NIH HHS · GM08168 · United States
NIGMS NIH HHS · R25 GM056833 · United States
NCI NIH HHS · CA096299 · United States
NCRR NIH HHS · G12 RR003060 · United States
NCI NIH HHS · U54 CA132378 · United States
NCI NIH HHS · U56 CA096299 · United States
NIGMS NIH HHS · S06 GM008168 · United States
NCRR NIH HHS · RR03060 · United States
NCI NIH HHS · U54 CA137788 · United States
NIGMS NIH HHS · S06 GM008168-230043 · United States
NCI NIH HHS · U56 CA096299-01 · United States
NCRR NIH HHS · G12 RR003060-24 · United States
External Links
PubMed source DOI: 10.4161/rna.6.3.8497 PMC Full Text View journal details
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