Exogenous insulin reduces proteolysis and protein synthesis in extremely low birth weight infants.

Exogenous insulin reduces proteolysis and protein synthesis in extremely low birth weight infants.
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外源性胰岛素会减少极低出生体重婴儿的蛋白水解和蛋白质合成。

DOI:
10.1016/s0022-3476(98)70389-0
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发表时间:
1998
期刊:
The Journal of pediatrics
影响因子:
--
通讯作者:
Denne,SC
Denne,SC
中科院分区:
--
文献类型:
--
作者:
Poindexter,BB;Karn,CA;Denne,SC

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目的探讨持续胰岛素输注对极低出生体重儿(ELBW)蛋白质和葡萄糖代谢的影响。研究设计(反映蛋白质水解),苯丙氨酸用于蛋白质合成,在葡萄糖的基础输注过程中使用稳定同位素示踪剂(6 mg/kg/min)和响应于胰岛素的连续输注(0.05 U/kg/hr),通过正常血糖高胰岛素钳夹技术。4例临床稳定、血糖正常的ELBW婴儿(妊娠26 ± 0周,出生体重894 ± 44克,2.8 ± 0.8天)。(从7 ± 2 μU/ml到79 ± 13 μU/ml),(基础:272 ± 27 μmol/kg/hr;胰岛素:226 ± 29 μmol/kg/hr; p < 0.01)和苯丙氨酸Ra(基础:91 ± 5 μmol/kg/hr;胰岛素:72 ± 2 μmol/kg/hr; p < 0.05)。用于蛋白质合成的苯丙氨酸的使用也以相似的幅度降低(基础:77 ± 4 μmol/kg/hr;胰岛素:62 ± 1 μmol/kg/hr; p < 0.05)。在胰岛素输注过程中,葡萄糖利用率增加一倍(从8 ± 0.9 mg/kg/min增加到15.7 ± 1.1 mg/kg/min; p = 0.0003),血浆乳酸浓度增加两倍(从2.1 ± 0.5 mmol/L增加到5.7 ± 1.0 mmol/L; p < 0.05)。此外,血糖正常的高胰岛素血症伴有显著的代谢性酸中毒。(J Pediatr 1998;132:948-53)
ObjectiveTo determine the effect of a continuous insulin infusion on protein and glucose metabolism in extremely low birth weight (ELBW) infants.Study designWe measured the rate of appearance (Ra) of the essential amino acids leucine and phenylalanine (reflecting proteolysis), utilization of phenylalanine for protein synthesis, and glucose Ra using stable isotope tracers during a basal infusion of glucose (6 mg/kg/min) and in response to a continuous infusion of insulin (0.05 U/kg/hr) by means of the euglycemic hyperinsulinemic clamp technique. Four clinically stable, euglycemic ELBW infants (26 ± 0 weeks' gestation, 894 ± 44 gm birth weight, 2.8 ± 0.8 days of age) were studied.ResultsIn response to a greater than tenfold increase in insulin concentration (from 7 ± 2 to 79 ± 13 μU/ml), there was a 20% decrease in leucine Ra (Basal: 272 ± 27 μmol/kg/hr; Insulin: 226 ± 29 μmol/kg/hr; p < 0.01) and in phenylalanine Ra (Basal: 91 ± 5 μmol/kg/hr; Insulin: 72 ± 2 μmol/kg/hr; p < 0.05). Use of phenylalanine for protein synthesis also decreased by a similar magnitude (Basal: 77 ± 4 μmol/kg/hr; Insulin: 62 ± 1 μmol/kg/hr; p < 0.05). Glucose utilization doubled (from 8 ± 0.9 to 15.7 ± 1.1 mg/kg/min; p = 0.0003) and plasma lactate concentrations tripled (from 2.1 ± 0.5 to 5.7 ± 1.0 mmol/L; p < 0.05) during the insulin infusion.ConclusionsDuring an infusion of glucose alone, pharmacologic concentrations of insulin in ELBW infants produced no net protein anabolic effect. Furthermore, euglycemic hyperinsulinemia was accompanied by development of significant metabolic acidosis. (J Pediatr 1998;132:948-53)
稳定同位素示踪剂研究中底物周转率的计算。
DOI: 10.1152/ajpendo.1983.245.3.e308
发表时间: 1983
期刊: The American journal of physiology
影响因子: --
作者:
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通讯作者: Kalhan,SC
DOI: 10.1016/s0022-3476(89)80797-8
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DOI: 10.1152/ajpendo.1987.253.6.e608
发表时间: 1987-12-01
影响因子: --
作者:
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长期母亲禁食期间高胰岛素血症对绵羊胎儿亮氨酸动力学的影响。
DOI: 10.1152/ajpendo.1992.263.4.e696
发表时间: 1992
期刊: The American journal of physiology
影响因子: --
作者:
Liechty,EA;Boyle,DW;Moorehead,H;Liu,YM;Denne,SC
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DOI: 10.1542/peds.78.4.625
发表时间: 1986
期刊: Pediatrics
影响因子: 8
作者:
S. Ostertag;L. Jovanovič;B. Lewis;P. Auld
通讯作者: P. Auld