![]() ![]() Histological examination of adipose tissue or FACS of adipocytes revealed the presence of GFP+ multilocular (ML) adipocytes, whose number was significantly increased by ROSI treatment or high-fat feeding. We tested this hypothesis by transplanting whole BM cells from GFP-expressing transgenic mice into wild-type C57BL/6 mice and subjecting them to a high-fat diet or treatment with the thiazolidinedione (TZD) rosiglitazone (ROSI) for several weeks. However, it is possible that progenitor cells from other tissues, in particular BM, could also contribute to development of new adipocytes in adipose tissue. New adipocytes are believed to arise from resident adipose tissue preadipocytes and mesenchymal progenitor cells. Obesity and weight gain are characterized by increased adipose tissue mass due to an increase in the size of individual adipocytes and the generation of new adipocytes.
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