首页> 外文期刊>American Journal of Physiology >Effect of hyperinsulinemia on amino acid utilization and oxidation independent of glucose metabolism in the ovine fetus.
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Effect of hyperinsulinemia on amino acid utilization and oxidation independent of glucose metabolism in the ovine fetus.

机译:高胰岛素血症对绵羊胎儿氨基酸利用和氧化的影响与葡萄糖代谢无关。

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We studied the effect of acute hyperinsulinemia on amino acid (AA) utilization and oxidation rates independent of insulin-enhanced glucose metabolism in fetal sheep. Metabolic studies were conducted in each fetus (n = 11) under three experimental periods. After control period (C) study, a fetal hyperinsulinemic-euglycemic-euaminoacidemic (HI-euG-euAA) clamp was established, followed by a hyperinsulinemic-hypoglycemic-euaminoacidemic (HI-hypoG-euAA) clamp to decrease glucose metabolic rates toward C values. Infusions of (3)H(2)0, L-[1-(13)C]leucine, and [(14)C(U)]glucose were administered to measure blood flow, leucine oxidation, and fetal glucose uptake, utilization, and oxidation in each period. Fetal glucose utilization rate increased 1.7-fold with hyperinsulinemia (C 5.8 +/- 0.8 mg.kg(-1).min(-1), HI-euG-euAA 10 +/- 1.3 mg.kg(-1).min(-1), P < 0.0001), returning to rates not different from C with hypoglycemia (HI-hypoG-euAA 7.1 +/- 0.9 mg.kg(-1).min(-1) vs. C value, P = 0.15). Fetal glucose oxidationrate increased 1.7-fold with hyperinsulinemia (C 3.1 +/- 0.2 mg.kg(-1).min(-1), HI-euG-euAA 5.4 +/- 0.4 mg.kg(-1).min(-1), P < 0.0001) and decreased to near control rates with hypoglycemia (4.0 +/- 0.3 HI-hypoG-euAA vs. C value, P = 0.006). AA utilization rates increased with hyperinsulinemia for all essential and most nonessential AAs (P < 0.001) and did not change when insulin-induced increases in glucose utilization returned to control rates. Leucine oxidation rate increased 1.7-fold with hyperinsulinemia (C 1.0 +/- 0.3 micromol.min(-1).kg(-1), HI-euG-euAA 1.7 +/- 0.3 micromol.min(-1).kg(-1), P < 0.002) and did not change when glucose oxidation rate was decreased with hypoglycemia. These results demonstrate that, in fetal sheep, insulin promotes AA utilization and oxidation independent of its simultaneous effects on glucose metabolism. In acute hyperinsulinemic conditions, AA oxidation does not change when insulin-induced glucose utilization is prevented.
机译:我们研究了急性高胰岛素血症对胎儿绵羊中氨基酸(AA)利用率和氧化速率的影响,而与胰岛素增强的葡萄糖代谢无关。在三个实验阶段对每个胎儿(n = 11)进行了代谢研究。在进行了控制期(C)研究后,建立了胎儿高胰岛素-正常血糖-euAA钳位,随后建立了高胰岛素-低血糖-正常氨基-钳位钳,以将葡萄糖代谢率降低至C值。输注了(3)H(2)0,L- [1-(13)C]亮氨酸和[(14)C(U)]葡萄糖,以测量血流量,亮氨酸氧化和胎儿葡萄糖摄取,利用,并在每个时期氧化。高胰岛素血症(C 5.8 +/- 0.8 mg.kg(-1).min(-1),HI-euG-euAA 10 +/- 1.3 mg.kg(-1).min的胎儿葡萄糖利用率增加1.7倍(-1),P <0.0001),恢复至与低血糖C相同的速率(HI-hypoG-euAA 7.1 +/- 0.9 mg.kg(-1).min(-1)vs.C值,P = 0.15)。高胰岛素血症使胎儿葡萄糖氧化率增加1.7倍(C 3.1 +/- 0.2 mg.kg(-1).min(-1),HI-euG-euAA 5.4 +/- 0.4 mg.kg(-1).min( -1),P <0.0001)并在低血糖时降至接近控制率(4.0 +/- 0.3 HI-hypoG-euAA vs. C值,P = 0.006)。高胰岛素血症对所有必需和最不重要的AA的AA利用率均随高胰岛素血症而增加(P <0.001),而当胰岛素诱导的葡萄糖利用率增加恢复至控制率时,AA利用率未发生变化。高胰岛素血症(C 1.0 +/- 0.3 micromol.min(-1).kg(-1),HI-euG-euAA 1.7 +/- 0.3 micromol.min(-1).kg( -1),P <0.002),并且当低血糖导致葡萄糖氧化速率降低时,其没有变化。这些结果表明,在胎羊中,胰岛素促进AA的利用和氧化,而独立于其对葡萄糖代谢的同时影响。在急性高胰岛素血症的情况下,当预防胰岛素诱导的葡萄糖利用时,AA氧化不会改变。

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