title: Inhibition of dipeptidyl peptidase 8/9 impairs preadipocyte differentiation.
abstract: Adipocytes are the primary cells in adipose tissue, and adipocyte dysfunction causes lipodystrophy, obesity and diabetes. The dipeptidyl peptidase (DPP) 4 family includes four enzymes, DPP4, DPP8, DPP9 and fibroblast activation protein (FAP). DPP4 family inhibitors have been used for the treatment of type 2 diabetes patients, but their role in adipocyte formation are poorly understood. Here we demonstrate that the DPP8/9 selective inhibitor 1G244 blocks adipogenesis in preadipocyte 3T3-L1 and 3T3-F422A, while DPP4 and FAP inhibitors have no effect. In addition, knockdown of DPP8 or DPP9 significantly impairs adipocyte differentiation in preadipocytes. We further uncovered that blocking the expression or activities of DPP8 and DPP9 attenuates PPARγ2 induction during preadipocyte differentiation. Addition of PPARγ agonist thiazolidinediones (TZDs), or ectopic expression of PPARγ2, is able to rescue the adipogenic defect caused by DPP8/9 inhibition in preadipocytes. These results indicate the importance of DPP8 and DPP9 on adipogenesis.
authors.affiliation: Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Ruijun
authors.initials: R
authors.lastname: Han
authors.affiliation: Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Xinying
authors.initials: X
authors.lastname: Wang
authors.affiliation: Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA, USA.
authors.forename: William
authors.initials: W
authors.lastname: Bachovchin
authors.affiliation: Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Zofia
authors.initials: Z
authors.lastname: Zukowska
authors.affiliation: Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: John W
authors.initials: JW
authors.lastname: Osborn
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000201:enzymology*; D000818:Animals; D002454:Cell Differentiation; D018819:Dipeptidyl Peptidase 4 / Q000235:genetics / Q000378:metabolism; D054873:Dipeptidyl-Peptidase IV Inhibitors / Q000494:pharmacology; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D055785:Gene Knockdown Techniques; D051379:Mice; D047495:PPAR gamma / Q000235:genetics / Q000378:metabolism
chemical_list: D054873:Dipeptidyl-Peptidase IV Inhibitors; D047495:PPAR gamma; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; D018819:Dipeptidyl Peptidase 4; C545245:Dpp4 protein, mouse; C585325:dipeptidyl peptidase 8, mouse; C585326:dipeptidyl peptidase 9, mouse