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. 1997 Dec 15;328(Pt 3):913–922. doi: 10.1042/bj3280913

Effects of adrenaline on triacylglycerol synthesis and turnover in ventricular myocytes from adult rats.

E M Swanton 1, E D Saggerson 1
PMCID: PMC1219004  PMID: 9396738

Abstract

Ca2+-tolerant myocytes were isolated with endogenous triacylglycerol (TAG) stores prelabelled with [3H]palmitate and subsequently incubated for a 1h chase period with [14C]palmitate, 2% albumin and 5mM glucose. Measurements were then made of [14C]palmitate conversion into TAG and phospholipids, of loss of [3H]TAG, of glycerol release and of change in the total TAG content. Rates of de novo synthesis of TAG were calculated by a balance method. With 0. 5mM palmitate present, 5 microM adrenaline increased de novo synthesis of TAG by 81% and incorporation of [14C]palmitate into phospholipids by 59%. Significant increases in these processes with adrenaline were also seen with 0.08, 0.14 and 0.26 mM palmitate. The beta-agonist isoprenaline had little effect on de novo synthesis of TAG and had no effect on [14C]palmitate conversion into phospholipids. The alpha1-agonist phenylephrine mimicked adrenaline in increasing [14C]palmitate conversion into phospholipids but had no effect on de novo synthesis of TAG. Adrenaline did not significantly alter the myocyte glycerol 3-phosphate content but caused a persistent 40% increase in the activity of the form of glycerolphosphate acyltransferase found predominantly in the sarcoplasmic reticulum. With 0.5 mM palmitate present, the value [14C]TAG formed -decrease in [3H]TAG consistently exceeded the enzymically measured change in cell TAG content. From this it was suggested that the specific radioactivity of [3H]TAG pool(s) mobilized during the chase period was lower than that of the overall cell TAG. In the basal state, complete mobilization of TAG measured as glycerol release was low, but cycling of TAG to diacylglycerol or monoacylglycerol and back to TAG appeared to be high. With adrenaline present, glycerol release was increased 5-6-fold but recycling of lower acylglycerols to TAG was abolished. Glycerol release was inhibited by increasing extracellular palmitate from 0.08 to 0.5 mM. Adrenaline partially over-rode this effect.

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Selected References

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