Hs. Kim et al., Induction of apoptosis by all-trans-retinoic acid and C2-ceramide treatment in rat stromal-vascular cultures, BIOC BIOP R, 270(1), 2000, pp. 76-80
Citations number
41
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Apoptosis of preadipocytes and adipocytes contributes to the balance of adi
pose tissue mass by reducing adipocyte number. To address this phenomenon,
we treated cultured rat S-V cells with all-trans-retinoic acid (RA) (10 mu
M) or C2-ceramide (50 mu M) during adipogenesis. Gel electrophoresis of DNA
from treated cells cultured in serum-free medium showed that 10 mu M Rei o
r 50 mu M ceramide induced a distinct laddering pattern of DNA fragments. C
ellular caspase 3 activity, another marker of apoptosis, was increased by R
A (10 mu M) (P < 0.05), but not by 50 mu m CB-ceramide. RT-PCR results show
ed that RA (10 mu M) decreased the expression of Bcl-2 mRNA These results s
uggest that fat cell loss by apoptosis can be regulated, in part, by RA (10
mu M) which increases caspase 3 activity and decreases Bcl-2 expression in
rat S-V cells. CB ceramide apparently works through a different cellular m
echanism to induce apoptosis. (C) 2000 Academic Press.