Wnt10b inhibits development of white and brown adipose tissues.
Wnt is a family of secreted signaling proteins that regulate diverse developmental processes. Activation of canonical Wnt signaling by Wnt10b inhibits differentiation of preadipocytes in vitro. To determine whether Wnt signaling blocks adipogenesis in vivo, we created transgenic mice in which Wnt10b is expressed from the FABP4 promoter. Expression of Wnt10b in adipose impairs development of this tissue throughout the body, with a decline of approximately 50% in total body fat and a reduction of approximately 60% in weight of epididymal and perirenal depots. FABP4-Wnt10b mice resist accumulation of adipose tissue when fed a high fat diet. Furthermore, transgenic mice are more glucose-tolerant and insulin-sensitive than wild type mice. Expression of Wnt10b from the FABP4 promoter also blocks development of brown adipose tissue. Interscapular tissue of FABP4-Wnt10b mice has the visual appearance of white adipose tissue but expresses neither brown (e.g. uncoupling protein 1) nor white adipocyte markers. Transgenic mice are unable to maintain a core body temperature when placed in a cold environment, providing further evidence that Wnt10b inhibits development of brown adipose tissue. Although food intake is not altered in FABP4-Wnt10b mice, oxygen consumption is decreased. Thus, FABP4-Wnt10b mice on a chow diet gain more weight than controls, largely because of an increase in weight of skin. In summary, inhibition by Wnt10b of white and brown adipose tissue development results in lean mice without lipodystrophic diabetes.
Longo
Kenneth A
KA
Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan 48109, USA.
Wright
Wendy S
WS
Kang
Sona
S
Gerin
Isabelle
I
Chiang
Shian-Huey
SH
Lucas
Peter C
PC
Opp
Mark R
MR
MacDougald
Ormond A
OA
D000273:Adipose Tissue / Q000166:cytology / Q000502:physiology*; D002001:Adipose Tissue, Brown / Q000166:cytology / Q000502:physiology*; D000818:Animals; D001835:Body Weight; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D002454:Cell Differentiation / Q000235:genetics*; D004032:Diet; D050556:Fatty Acid-Binding Proteins; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D011518:Proto-Oncogene Proteins / Q000502:physiology*; D015398:Signal Transduction; D051153:Wnt Proteins
D002352:Carrier Proteins; C493411:Fabp4 protein, mouse; D050556:Fatty Acid-Binding Proteins; D011518:Proto-Oncogene Proteins; D051153:Wnt Proteins; C102068:Wnt10b protein, mouse