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. 1994 Mar 1;91(5):1786–1790. doi: 10.1073/pnas.91.5.1786

Peroxisome proliferator and retinoid signaling pathways co-regulate preadipocyte phenotype and survival.

A Chawla 1, M A Lazar 1
PMCID: PMC43248  PMID: 8127882

Abstract

Culture of mouse 3T3-L1 preadipocytes in medium containing delipidated bovine calf serum caused the cells to elongate and divide after reaching confluency. The continued proliferation correlated with sustained expression of the c-myc gene, which was repressed in control cells. Exposure of the cells to activators of peroxisome proliferator-activated receptor (PPAR), including clofibrate, WY-14,643, and 5,8,11,14-eicosatetraynoic acid, reversed and prevented the effects of culturing preadipocytes in delipidated serum. Continued exposure to PPAR activators led to adipose conversion, during which PPAR and its heterodimerization partner (retinoid X receptor) were induced. Retinoic acid (RA) had no effect on the growth or survival of preadipocytes grown in the presence of normal bovine serum. However, treatment of cells cultured in delipidated serum with RA caused death of the cells by apoptosis. Thus, preadipocyte phenotype and survival are regulated by activators of nuclear hormone receptors.

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