Growth and maturation of primary-cultured adipocytes from lean and ob/ob mice.
Stromal vascular cells from epididymal fat pads of lean and obese mice were cultured in a medium (alpha-MEM) containing fetal bovine serum (FBS) and cell replication followed for 11 days. In both types of cells, confluence occurred at 4-5 days, after which virtual growth arrest occurred in lean-mouse cells while replication continued, albeit at a slower rate in obese-mouse cells. Little or no lipid accumulation or glycerol-3-phosphate dehydrogenase (GPDH) activity was observed under these conditions. When a differentiation mixture consisting of insulin, corticosterone and isobutylmethylxanthine was added to the serum-containing alpha-MEM, a proportion of the lean-mouse cells accumulated triglycerides and GPDH activity increased significantly, indicating differentiation. By contrast, little or no differentiation occurred in obese-mouse cells. When cells grown in serum-containing alpha-MEM were transferred to a serum-free defined medium at confluence, extensive differentiation and maturation occurred in lean-mouse cells but not in obese-mouse cells. Similar experiments were conducted in cells isolated from the retroperitoneal fat pad. Although the growth pattern was similar to that of epididymal preadipocytes, the retroperitoneal lean- and obese-mouse cells differentiated more readily than epididymal cells, as shown by the GPDH specific activity. These data suggest that cells from obese mice are resistant to differentiation under conditions that support extensive differentiation in lean-mouse cells.
Black
M A
MA
Department of Biochemistry, University of Ottawa, Faculty of Medicine, Canada.
Bégin-Heick
N
N
D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D017667:Adipocytes / Q000166:cytology* / Q000187:drug effects / Q000473:pathology; D000818:Animals; D002417:Cattle; D002453:Cell Cycle / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D003345:Corticosterone / Q000494:pharmacology; D003470:Culture Media; D016895:Culture Media, Serum-Free; D004822:Epididymis; D005993:Glycerolphosphate Dehydrogenase / Q000032:analysis / Q000378:metabolism; D007328:Insulin / Q000494:pharmacology; D007700:Kinetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008820:Mice, Obese; D009765:Obesity / Q000473:pathology; D013851:Thinness / Q000473:pathology; D013997:Time Factors
D003470:Culture Media; D016895:Culture Media, Serum-Free; D007328:Insulin; D005993:Glycerolphosphate Dehydrogenase; D015056:1-Methyl-3-isobutylxanthine; D003345:Corticosterone