title: Increased Basement Membrane Components in Adipose Tissue During Obesity: Links With TGFβ and Metabolic Phenotypes.
abstract: Collagen accumulation around adipocytes and vessels (ie, pericellular fibrosis) is a hallmark of obese adipose tissue associated with altered metabolism.
  
  
  
  Our objective was to evaluate components of basement membrane (BM) in adipose tissue, including collagen IV, a major BM component, and its relationships with metabolic parameters and TGFβ isoforms.
  
  
  
  We used immuno-techniques and gene expression approaches to detect BM components in subcutaneous and visceral adipose tissue samples. Adipocytes and endothelial cells were isolated from lean and obese adipose tissue. We also focused on the expression of COL4A1 correlated to metabolic variables in moderate obesity and, in severe obesity before and after bariatric surgery. Using in vitro analysis, we explored the impact of TGFβ isoforms on the expression of inflammatory and extracellular matrix genes in adipocytes and endothelial cells.
  
  
  
  BM components were detected around adipocytes and endothelial cells, and were increased in obese adipocytes. COL4A1 expression was positively correlated with insulin-resistance indices in obese subjects and showed less reduction in severely obese subjects with poorer insulin-resistance outcomes 6 months after gastric bypass. COL4A1 expression also correlated with TGFβ1 and TGFβ3 gene expressions in subcutaneous adipose tissue. Stimulating isolated adipocytes and endothelial cells in vitro with these TGFβ isoforms showed an inflammatory and pro-fibrotic phenotype. However, TGFβ1 and TGFβ3 exposure only provoked COL4A1 overexpression in endothelial cells and not in adipocytes.
  
  
  
  The disorganization of several BM components, including collagen IV, could contribute to pathological alterations of obese adipose tissue and cells.
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Reggio
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Christine
authors.initials: C
authors.lastname: Rouault
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Christine
authors.initials: C
authors.lastname: Poitou
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Bichet
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Edi
authors.initials: E
authors.lastname: Prifti
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Bouillot
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Salwa
authors.initials: S
authors.lastname: Rizkalla
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Danièle
authors.initials: D
authors.lastname: Lacasa
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Joan
authors.initials: J
authors.lastname: Tordjman
authors.affiliation: Nutrition Department (S.R., C.R., C.P., E.P., S.R., J.T., K.C.), Institute of Cardiometabolism and Nutrition, Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France; Nutriomics Team (S.R., C.R., C.P., D.L., J.T., K.C.), INSERM, UMR_S U1166, Paris, France; Sorbonne Universités (S.R., C.R., C.P., D.L., J.T., K.C.), Université Pierre et Marie Curie, UMR_S 1166, Paris, France; Plastic Surgery and Mammary Cancer Department (J.-C.B.), Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France; and Visceral Surgery Department (J.-L.B.), Ambroise Paré Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
authors.forename: Karine
authors.initials: K
authors.lastname: Clément
mesh_terms: D017667:Adipocytes / Q000378:metabolism; D000273:Adipose Tissue / Q000378:metabolism*; D001485:Basement Membrane / Q000378:metabolism*; D002478:Cells, Cultured; D024141:Collagen Type IV / Q000235:genetics / Q000378:metabolism; D042783:Endothelial Cells / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism*; D053773:Transforming Growth Factor beta1 / Q000235:genetics / Q000378:metabolism*; D053782:Transforming Growth Factor beta3 / Q000235:genetics / Q000378:metabolism*
chemical_list: C547475:COL4A1 protein, human; D024141:Collagen Type IV; D053773:Transforming Growth Factor beta1; D053782:Transforming Growth Factor beta3