Overexpression of uncoupling protein 4 promotes proliferation and inhibits apoptosis and differentiation of preadipocytes.
Uncoupling proteins are a family of mitochondrial proteins involved in energy metabolism. We previously showed that uncoupling protein 4 (UCP4) is differentially expressed in omental adipose tissue in diet-induced obese and normal rats. However, the effect of UCP4 on adipocytes is unclear. In this work, we established a stable preadipocyte cell line overexpressing UCP4 to observe the direct effect of UCP4 on adipocytes. Cells overexpressing UCP4 showed significantly attenuated differentiation of preadipocytes into adipocytes. During differentiation, expression of adipogenesis-associated markers such as fatty acid synthetase, peroxisome proliferator-activated receptor gamma, CCAAT enhancer binding protein alpha, adipocyte lipid binding protein and lipoprotein lipase were downregulated. Preadipoctes expressing UCP4 grew faster and more of them stayed in S phase compared to control cells. In addition, UCP4 overexpression protected preadipocytes from apoptosis induced by serum deprivation. Our results demonstrate that overexpression of UCP4 can promote proliferation and inhibit apoptosis and differentiation of preadipocytes.
Zhang
Min
M
Department of Pediatrics, Nanjing Maternity and Child Health Hospital of Nanjing Medical University, 210004 Nanjing, China.
Wang
Bin
B
Ni
Yu-Hui
YH
Liu
Feng
F
Fei
Li
L
Pan
Xiao-qing
XQ
Guo
Mei
M
Chen
Rong-hua
RH
Guo
Xi-rong
XR
D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology*; D050156:Adipogenesis / Q000235:genetics*; D000818:Animals; D017209:Apoptosis / Q000235:genetics; D022763:CCAAT-Enhancer-Binding Protein-alpha; D002454:Cell Differentiation / Q000235:genetics*; D002460:Cell Line; D049109:Cell Proliferation; D064429:Fatty Acid Synthases / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D007473:Ion Channels / Q000235:genetics* / Q000378:metabolism*; D051379:Mice; D024101:Mitochondrial Proteins / Q000235:genetics* / Q000378:metabolism*; D000071245:Mitochondrial Uncoupling Proteins; D047495:PPAR gamma / Q000378:metabolism; D051381:Rats; D015533:Transcriptional Activation
D022763:CCAAT-Enhancer-Binding Protein-alpha; D007473:Ion Channels; D024101:Mitochondrial Proteins; D000071245:Mitochondrial Uncoupling Proteins; D047495:PPAR gamma; C494853:Slc25a27 protein, rat; D064429:Fatty Acid Synthases