title: Heat shock triggers MAPK activation and MKP-1 induction in Leydig testicular cells.
abstract: Testicular function is highly dependent on temperature control. In Leydig testicular cells, the signaling pathway activated by heat stress is poorly defined. Here we describe the molecular events triggered by heat shock (HS, 10 min, 45 degrees C) in MA-10 cells. HS produced a rapid and transient activation of ERK1/2 and JNK kinases, and also increased MAP kinase phosphatase-1 (MKP-1) protein and mRNA levels. The effect of HS on MKP-1 messenger reached significance at 15 min, peaked (3.5-fold) at 60 min, and was partially dependent on ERK1/2 activity. The temporal profiles of MKP-1 protein levels and MAPKs phospho-dephosphorylation suggest that MKP-1 induction could contribute to ERK1/2 and JNK inactivation after HS. In summary, this study indicates that the response to heat stress in Leydig cells includes the activation of MAPKs related to cell survival (ERK1/2) and death (JNK), and the induction of a MAPK activity inhibitory loop.
authors.affiliation: Department of Biochemistry, School of Medicine, University of Buenos Aires, Argentina.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Gorostizaga
authors.forename: Laura
authors.initials: L
authors.lastname: Brion
authors.forename: Paula
authors.initials: P
authors.lastname: Maloberti
authors.forename: Fabiana
authors.initials: F
authors.lastname: Cornejo Maciel
authors.forename: Ernesto J
authors.initials: EJ
authors.lastname: Podestá
authors.forename: Cristina
authors.initials: C
authors.lastname: Paz
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D054638:Dual Specificity Phosphatase 1; D004789:Enzyme Activation; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000378:metabolism; D018869:Heat-Shock Response / Q000502:physiology*; D006358:Hot Temperature; D017874:Immediate-Early Proteins / Q000235:genetics / Q000378:metabolism*; D007985:Leydig Cells / Q000201:enzymology* / Q000378:metabolism; D008297:Male; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism*; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000378:metabolism*; D054645:Protein Phosphatase 1; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D018797:Cell Cycle Proteins; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D017874:Immediate-Early Proteins; D012333:RNA, Messenger; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D010749:Phosphoprotein Phosphatases; D054645:Protein Phosphatase 1; D054638:Dual Specificity Phosphatase 1; C517020:Dusp1 protein, mouse; D017027:Protein Tyrosine Phosphatases; D002118:Calcium