Omental preadipocytes were more than twofold more susceptible to apoptosis induced by serum deprivation (P<0.05) or TNF-alpha (P<0.02) compared to subcutaneous preadipocytes.
Are human omental preadipocytes more susceptible to apoptosis than subcutaneous preadipocytes?
Human omental preadipocytes are intrinsically more susceptible to apoptosis than subcutaneous preadipocytes, which may contribute to depot-specific differences in adipose tissue distribution.
Effect estimate: >2-fold higher
p-value: p=<0.05
Adipose tissue mass is determined by both the number and volume of adipose cells. Adipose cell number reflects the balance of cell acquisition and cell loss, whereas adipose cell volume represents the balance of lipolysis and lipogenesis. It is well recognized that insulin resistance, NIDDM, and other metabolic disorders are associated more strongly with increased omental adiposity than with subcutaneous adiposity. Depot-related differences exist in adipocyte responses to lipolytic and lipogenic stimuli, in adipocyte apoptosis, and in the potential for preadipocyte replication and differentiation. In the present study, we address the question of whether there might also be a site-specific difference in the susceptibility of human preadipocytes to apoptosis. Paired samples of human omental and subcutaneous preadipocytes from 12 individuals were cultured, and apoptosis was induced by serum deprivation or treatment with tumor necrosis factor (TNF)-alpha for 4 h. Cells were then stained with acridine orange, and apoptotic indices were calculated as the fraction of cells showing nuclear condensation. Under both conditions, in 9 of 11 subjects, apoptotic indices were substantially greater in preadipocytes from the omental depot than in those from the subcutaneous depot, and mean apoptotic indices were more than twofold higher in omental cells (serum-free medium: P < 0.05; TNF-alpha: P < 0.02; paired t test). Omental preadipocytes are therefore more susceptible to two different apoptotic stimuli than subcutaneous preadipocytes, demonstrating another intrinsic site-specific difference between human adipose cells of the two depots. These results suggest that the regulation of adipose tissue distribution in humans could involve depot-specific differences in rates of preadipocyte apoptosis.
Niesler et al. (Sat,) reported a other. Omental depot origin vs. Subcutaneous depot origin was evaluated on Apoptotic indices (fraction of cells showing nuclear condensation) (>2-fold higher, p=<0.05). Omental preadipocytes were more than twofold more susceptible to apoptosis induced by serum deprivation (P<0.05) or TNF-alpha (P<0.02) compared to subcutaneous preadipocytes.