首页> 外文期刊>American Journal of Physiology >IGF-I increases forearm blood flow without increasing forearm glucose uptake.
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IGF-I increases forearm blood flow without increasing forearm glucose uptake.

机译:IGF-1增加前臂血流量而不增加前臂葡萄糖摄取。

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Decreased insulin-mediated muscle glucose uptake is a characteristic feature of non-insulin-dependent diabetes mellitus and other insulin-resistant states. It has been suggested that an impairment in the ability of insulin to augment limb blood flow, resulting in diminished glucose delivery to muscle, may contribute to this abnormality. In this study, we used human insulin-like growth factor (IGF) I in conjunction with the forearm balance technique to determine whether forearm glucose uptake could be stimulated by increasing blood flow without directly stimulating the intrinsic ability of the muscle to extract glucose. IGF-I was infused intra-arterially in healthy controls at a rate of either 0.4 microg . kg-1 . min-1 (high IGF) or 0.04 microg . kg-1 . min-1 (low IGF) for 140 min. With high IGF, forearm blood flow increased approximately twofold (34 +/- 3 vs. 64 +/- 8 ml . min-1 . l forearm volume-1, P < 0.01), and arteriovenous glucose concentration difference (a-v difference) increased modestly (0.19 +/- 0.05 vs. 0.31 +/- 0.08 mM, P = 0.32), resulting in an increased forearm glucose uptake (6.4 +/- 1.7 vs. 21.7 +/- 7.4 micromol . min-1 . l forearm volume-1, P = 0.09 vs. basal). With low IGF, forearm blood flow increased by 59% (29 +/- 4 vs. 46 +/- 9 ml . min-1 . l forearm volume-1, P < 0.05) and was associated with a proportional decrease in the a-v difference (0. 29 +/- 0.04 vs. 0.18 +/- 0.05 mM, P < 0.05). Forearm glucose uptake therefore was not significantly different from basal values (7.6 +/- 0.6 vs. 6.9 +/- 1.8 micromol . min-1 . kg-1). These data demonstrate that increasing blood flow without increasing the intrinsic ability of the muscle to extract glucose does not increase forearm muscle glucose uptake.
机译:胰岛素介导的肌肉葡萄糖摄取减少是非胰岛素依赖型糖尿病和其他胰岛素抵抗状态的特征。已经提出,胰岛素增加肢体血流的能力受损,导致葡萄糖向肌肉的递送减少,可能导致这种异常。在这项研究中,我们将人胰岛素样生长因子(IGF)I与前臂平衡技术结合使用,以确定是否可以通过增加血流量而不直接刺激肌肉提取葡萄糖的内在能力来刺激前臂葡萄糖的摄取。将IGF-I以0.4微克的速率经动脉内输注到健康对照中。千克-1。 min-1(高IGF)或0.04 microg。千克-1。 min-1(低IGF)持续140分钟。 IGF高时,前臂血流量增加约两倍(34 +/- 3 vs. 64 +/- 8 ml。min-1 .l前臂体积-1,P <0.01),动静脉葡萄糖浓度差异(av差异)增加适度(0.19 +/- 0.05 vs. 0.31 +/- 0.08 mM,P = 0.32),导致前臂葡萄糖摄取增加(6.4 +/- 1.7 vs.21.7 +/- 7.4 micromol.min-1.l前臂体积-1,相对于基础,P = 0.09)。 IGF低时,前臂血流量增加59%(29 +/- 4 vs. 46 +/- 9 ml。min-1 .l前臂体积-1,P <0.05),并且与av的成比例降低有关差异(0.29 +/- 0.04与0.18 +/- 0.05 mM,P <0.05)。因此,前臂的葡萄糖摄取与基础值无显着差异(7.6 +/- 0.6 vs. 6.9 +/- 1.8 micromol。min-1。kg-1)。这些数据表明,在不增加肌肉提取葡萄糖的内在能力的情况下增加血流量不会增加前臂肌肉的葡萄糖摄取。

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