title: Heat shock modulates adipokines expression in 3T3-L1 adipocytes.
abstract: Studies have demonstrated that heat shock is associated with alteration in energy metabolism. In this study, we investigated the effect of heat shock on gene expression and secretion of adiponectin and leptin, and gene expression of Hspa2 and Ppargamma in 3T3-L1 adipocytes. Compared with 37 degrees C, adiponectin mRNA was higher at 39 degrees C, and lower at 41 degrees C. Leptin mRNA was higher when adipocytes were exposed to 41 degrees C compared with 37 and 39 degrees C. Secretion of adiponectin increased at 39 degrees C, and when cells were exposed to 41 degrees C it was not detectable. Leptin secretion increased significantly at 41 degrees C, compared with 37 and 39 degrees C. Hspa2 mRNA was increased at 39 degrees C, and the highest level was reached at 41 degrees C. Ppargamma mRNA exhibited a substantial increase in a temperature-dependent manner. The study provides the first evidence of a possible direct effect of heat shock on adiponectin and leptin gene expression and secretion, and demonstrates that the expression of the two adipokines is differentially regulated at the temperatures tested.
authors.affiliation: Dipartimento di Produzioni Animali, Università della Tuscia, Viterbo 01100, Italy. bernab@unitus.it
authors.forename: Umberto
authors.initials: U
authors.lastname: Bernabucci
authors.forename: Loredana
authors.initials: L
authors.lastname: Basiricò
authors.forename: Patrizia
authors.initials: P
authors.lastname: Morera
authors.forename: Nicola
authors.initials: N
authors.lastname: Lacetera
authors.forename: Bruno
authors.initials: B
authors.lastname: Ronchi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Nardone
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology / Q000378:metabolism*; D052242:Adiponectin / Q000235:genetics* / Q000378:metabolism; D000818:Animals; D002470:Cell Survival; D005786:Gene Expression Regulation; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism; D018869:Heat-Shock Response; D006358:Hot Temperature; D007700:Kinetics; D020738:Leptin / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D047495:PPAR gamma / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D052242:Adiponectin; D018840:HSP70 Heat-Shock Proteins; C490434:Hspa2 protein, mouse; D020738:Leptin; D047495:PPAR gamma; D012333:RNA, Messenger