The cooperation of adipocytes and stromal cells in the secretion of prostaglandins by rat adipose tissue is not influenced by diet.
1993
Zhang M. | Hausman D.B. | Hausman G.J.
This study examined the influence of dietary essential fatty acids on the cooperativity of isolated adipocytes and stromal-vascular cells in the biosynthesis of prostaglandins. Sprague-Dawley rats were fed either a diet rich in essential fatty acids (20% corn oil) or a diet poor in essential fatty acids (20% tallow) for 4 wk. Preparations containing primarily adipose cells (adipocytes) or stromal-vascular cells (nonfat cells) were obtained from epididymal fat pads by collagenase digestion and repeatedly washed. Prostaglandin production was evaluated in basal and epinephrine-stimulated media after incubation with either adipocytes or adipocytes + nonfat cells. Prostaglandin E2 and prostacyclin production by adipocytes + nonfat cells was dose-dependent with epinephrine stimulation in cells from rats fed both diets. Both prostaglandin E2 and glycerol release in response to epinephrine (10-100 (micromole/L) stimulation from adipocytes or from adipocytes + nonfat cells were significantly higher for cells from corn oil-fed rats than for cells from tallow-fed rats. Regardless of dietary treatment, epinephrine-stimulated prostaglandin E2 and prostacyclin release from adipocytes + nonfat cells was much greater than from adipocytes. These results suggest that a diet high in essential fatty acids precipitates a higher prostaglandin E2 secretion and that nonfat cells potentiate the secretion of prostaglandin E2 and prostacyclin by adipocytes regardless of diet.
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