| Citation | Mertenskotter A, Keshet A, Gerke P, Paul RJ. The p38 MAPK PMK-1 shows heat-induced nuclear translocation, supports chaperone expression, and affects the heat tolerance of Caenorhabditis elegans. Cell Stress Chaperones, 2013. |
| PubMed ID | 23117578 |
| Short Description | The p38 MAPK PMK-1 shows heat-induced nuclear translocation, supports chaperone expression, and affects the heat tolerance of Caenorhabditis elegans. GEO Record: GSE41205 Platform: GPL13657 Download gene-centric, log2 transformed data: WBPaper00041697.ce.rs.csv |
| # of Conditions | 2 |
Full Description
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The p38 mitogen-activated protein kinase PMK-1 of Caenorhabditis elegans has been associated with heavy metal, oxidative and pathogen stress. Pmk-1 is part of an operon comprising three p38 homologues, with pmk-1 expression suggested to be regulated by the operon promoter. There are contradictory reports about the cellular localization of PMK-1. We were interested to study principles of pmk-1 expression and to analyze the role of PMK-1 under heat stress. Using a translational GFP reporter, we found pmk-1 expression to be driven by a promoter in front of pmk-1. PMK-1 was detected in intestinal cells and neurons, with a cytoplasmic localization at moderate temperature. Increasing temperature above 32 C, however, induced a nuclear translocation of PMK-1 as well as PMK-1 accumulation near to apical membranes. Testing survival rates revealed 34-35 C as critical temperature range, where short-term survival severely decreased. Mutants of the PMK-1 pathway (pmk-1, sek-1, mek-1) as well as a mutant of JNK pathway (jnk-1) showed significantly lower survival rates than wild-type or mutants of other pathways (kgb-1, daf-2). Rescue and overexpression experiments verified the negative effects of pmk-1 on heat tolerance. Studying gene expression by RNA-seq and semi-quantitative reverse transcriptase polymerase chain reaction revealed positive effects of the PMK-1 pathway on the expression of genes for chaperones, protein biosynthesis, protein degradation, and other functional categories. Thus, the PMK-1 pathway is involved in the heat stress responses of C. elegans, possibly by a PMK-1-mediated activation of the transcription factor SKN-1 and/or an indirect or direct PMK-1-dependent activation (hyperphosphorylation) of heat-shock factor 1. Experimental Details: RNASeq.elegans.WBStrain00000001.WBls:0000063.Hermaphrodite.WBbt:0007833.SRP015918.SRX189885 RNASeq.elegans.WBStrain00024040.WBls:0000063.Hermaphrodite.WBbt:0007833.SRP015918.SRX189886. |
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