title: Proteomics analyses of subcutaneous adipocytes reveal novel abnormalities in human insulin resistance.
abstract: To provide a more global view of adipocyte changes in human insulin resistance by proteomics analyses.
  
  
  
  Baseline biopsies of abdominal subcutaneous adipose tissue were obtained from 23 subjects without diabetes. Euglycemic clamps were used to divide subjects into an insulin-resistant group (IR, N = 10) and an insulin-sensitive (IS, N = 13) group, which were of similar age and gender but unequal adiposity (greater in IR). Proteins of isolated adipocytes were quantified by mass spectrometry using normalized spectral abundance factors.
  
  
  
  Of 1,245 proteins assigned, 30 were detected in at least 12 of the 23 subjects that differed significantly in abundance ≥1.5-fold between IR and IS. IR displayed a pattern of increased cytoskeletal proteins and decreased mitochondrial proteins and FABP4 and FABP5. In subgroup analyses of adiposity-matched subjects, several of these changes were less pronounced in IR, but the abundance of proteins related to lipid metabolism and the unfolded/misfolded protein response were significantly and unfavorably altered.
  
  
  
  These results confirm lower abundance of mitochondrial proteins and suggest increased cytoskeletal proteins and decreased FABP4 and FABP5 in subcutaneous adipocytes of typical IR individuals. Changes in proteins related to lipid metabolism and the unfolded/misfolded protein may discriminate IR and IS individuals of equal adiposity.
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.
authors.forename: Xitao
authors.initials: X
authors.lastname: Xie
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.|Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy/Health Sciences, Wayne State University, Detroit, Michigan, USA.
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Yi
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Sinha
authors.affiliation: Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, Florida, USA.
authors.forename: Meenu
authors.initials: M
authors.lastname: Madan
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.
authors.forename: Benjamin P
authors.initials: BP
authors.lastname: Bowen
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Langlais
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy/Health Sciences, Wayne State University, Detroit, Michigan, USA.
authors.forename: Danjun
authors.initials: D
authors.lastname: Ma
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.
authors.forename: Lawrence
authors.initials: L
authors.lastname: Mandarino
authors.affiliation: Center for Metabolic Biology, Arizona State University, Tempe, Arizona, USA.|Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, Florida, USA.
authors.forename: Christian
authors.initials: C
authors.lastname: Meyer
mesh_terms: D017667:Adipocytes / Q000737:chemistry*; D050154:Adiposity; D000328:Adult; D003598:Cytoskeletal Proteins / Q000032:analysis; D050556:Fatty Acid-Binding Proteins / Q000032:analysis; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007333:Insulin Resistance; D008297:Male; D008875:Middle Aged; D024101:Mitochondrial Proteins / Q000032:analysis; D040901:Proteomics; D050507:Subcutaneous Fat, Abdominal / Q000166:cytology*
chemical_list: D003598:Cytoskeletal Proteins; C493410:FABP4 protein, human; C493412:FABP5 protein, human; D050556:Fatty Acid-Binding Proteins; D024101:Mitochondrial Proteins