Premium
Permanent activation of HMGA2 in lipomas mimics its temporal physiological activation linked to the gain of adipose tissue
Author(s) -
Thies Helge W.,
Nolte Ingo,
Wenk Heiner,
Mertens Fredrik,
Bullerdiek Jörn,
Markowski Dominique N.
Publication year - 2014
Publication title -
obesity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.438
H-Index - 199
eISSN - 1930-739X
pISSN - 1930-7381
DOI - 10.1002/oby.20137
Subject(s) - adipose tissue , weight gain , white adipose tissue , medicine , endocrinology , body weight
Objective: In this study the activation of HMGA2 and overexpression by FGF1‐driven stimulation of adipose tissue derived stem cells (ADSCs) in adipose tissue tumors were analyzed. In addition, the expression of HMGA2 and PPAR ‐ gamma mRNA were quantified in canine subcutaneous abdominal adipose tissue from normal and overweight purebred dogs. Design and Methods: ADSCs and adipose tissue explants stimulated with FGF1 followed by gene expression analyses of HMGA2 and p14 Arf using Western‐blot and qRT‐PCR. Furthermore, canine subcutaneous white adipose tissue (WAT) were analyzed by qRT‐PCR for their expression of HMGA2 and PPAR‐gamma . Results: ADSCs and adipose tissue explants are able to execute a HMGA2 response upon FGF1 stimulation. FGF1 enhances proliferation of ADSCs by a HMGA2‐dependent mechanism. In lipomas increase of HMGA2 is accompanied by increased expression of p14 Arf . Furthermore, a significantly elevated level of HMGA2 in overweight dogs and a negative correlation between the expression of HMGA2 and PPAR‐gamma in subcutaneous cWAT were noted. Conclusions: These results suggest that WAT contains cells that as essential part of adipogenesis up‐regulate HMGA2 resulting from growth factor stimulation. In subgroups of lipoma, constitutive activation of HMGA2 due to rearrangements replaces the temporal response triggered by growth factors.