title: Mitogen-activated protein kinases, inhibitory-kappaB kinase, and insulin signaling in human omental versus subcutaneous adipose tissue in obesity.
abstract: MAPKs and inhibitory-kappaB kinase (IKK) were suggested to link various conditions thought to develop in adipose tissue in obesity (oxidative, endoplasmic reticulum stress, inflammation) with insulin resistance. Yet whether in obesity these kinases are affected in a fat-depot-differential manner is unknown. We assessed the expression and phosphorylation of these kinases in paired omental and abdominal-sc fat biopsies from 48 severely obese women (body mass index > 32 kg/m(2)). Protein and mRNAs of p38MAPK, ERK, c-Jun kinase-1, and IKKbeta were increased 1.5-2.5-fold in omental vs. sc fat. The phosphorylated (activated) forms of these kinases were also increased to similar magnitudes as the total expression. However, phosphorylation of insulin receptor substrate-1 on Ser312 (equivalent of murine Ser307) was not increased in omental, compared with sc, fat. Consistently, fat tissue fragments stimulated with insulin demonstrated that tyrosine phosphorylation and signal transduction to Akt/protein kinase B in omental fat was not inferior to that observable in sc fat. Comparison with lean women (body mass index 23.2 +/- 2.9 kg/m(2)) revealed similar ERK2 and IKKbeta expression and phosphorylation in both fat depots. However, as compared with lean controls, obese women exhibited 480 and 270% higher amount of the phosphorylated forms of p38MAPK and c-Jun kinase, respectively, in omental, but not sc, fat, and this expression level correlated with clinical parameters of glycemia and insulin sensitivity. Increased expression of stress-activated kinases and IKK and their phosphorylated forms in omental fat occurs in obesity, potentially contributing to differential roles of omental and sc fat in the pathophysiology of obesity.
authors.affiliation: Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84103, Israel.
authors.forename: Nava
authors.initials: N
authors.lastname: Bashan
authors.forename: Karina
authors.initials: K
authors.lastname: Dorfman
authors.forename: Tanya
authors.initials: T
authors.lastname: Tarnovscki
authors.forename: Ilana
authors.initials: I
authors.lastname: Harman-Boehm
authors.forename: Idit F
authors.initials: IF
authors.lastname: Liberty
authors.forename: Matthias
authors.initials: M
authors.lastname: Blüher
authors.forename: Shira
authors.initials: S
authors.lastname: Ovadia
authors.forename: Tali
authors.initials: T
authors.lastname: Maymon-Zilberstein
authors.forename: Ruth
authors.initials: R
authors.lastname: Potashnik
authors.forename: Michael
authors.initials: M
authors.lastname: Stumvoll
authors.forename: Eliezer
authors.initials: E
authors.lastname: Avinoach
authors.forename: Assaf
authors.initials: A
authors.lastname: Rudich
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D051550:I-kappa B Kinase / Q000378:metabolism*; D066298:In Vitro Techniques; D007328:Insulin / Q000494:pharmacology*; D055504:Insulin Receptor Substrate Proteins; D050152:Intra-Abdominal Fat / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D008875:Middle Aged; D048055:Mitogen-Activated Protein Kinase 8 / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009765:Obesity / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D009852:Omentum / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D051058:Oncogene Protein v-akt / Q000378:metabolism; D010750:Phosphoproteins / Q000378:metabolism; D010766:Phosphorylation; D015398:Signal Transduction / Q000187:drug effects; D050151:Subcutaneous Fat / Q000201:enzymology / Q000378:metabolism* / Q000473:pathology; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: C526292:IRS1 protein, human; D007328:Insulin; D055504:Insulin Receptor Substrate Proteins; D010750:Phosphoproteins; D051058:Oncogene Protein v-akt; D051550:I-kappa B Kinase; D048055:Mitogen-Activated Protein Kinase 8; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases