Growth hormone directly stimulates gluconeogenesis in canine renal proximal tubule.

Growth hormone directly stimulates gluconeogenesis in canine renal proximal tubule.
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生长激素直接刺激犬肾近曲小管的糖异生。

DOI:
10.1152/ajpendo.1989.257.5.e751
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发表时间:
1989
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Hammerman,MR
Hammerman,MR
中科院分区:
--
文献类型:
--
作者:
Rogers,SA;Karl,IE;Hammerman,MR

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为了表征生长激素(GH)对肾近端小管中的胚胎发生的作用,在与1 mM L-丙氨酸、10 mM乳酸盐、1 mM琥珀酸盐和不同浓度(10(-11)至10(-6)M)的重组牛GH(bGH)孵育的犬肾近端小管节段的悬浮液中测量葡萄糖产生。120分钟内,葡萄糖产量随时间增加。牛生长激素(10(-6)M)在120分钟时使葡萄糖产量增加55 +/-16%。在用低至10(-10)M bGH孵育的节段悬浮液中,葡萄糖产生显著增强。半最大刺激发生在10(-9)和10(-8)M之间。为了确定是否这些行动的bGH直接介导,我们确定了胰岛素样生长因子(IGFs)I和II对葡萄糖生产的影响。添加IGF-I片段以浓度依赖性方式增强葡萄糖产生。然而,与bGH孵育没有诱导可测量的IGF-I生产的部分。与IGF-I的作用相反,IGF-II不影响葡萄糖的产生。我们的结论是,生长激素直接作用于近端肾小管段内的细胞,以增强血管生成。GH对离体肾小管上皮细胞的刺激作用可能反映了GH对体内肾近曲小管的反调节作用。
To characterize the action of growth hormone (GH) on gluconeogenesis in renal proximal tubule, glucose production was measured in suspensions of canine renal proximal tubular segments incubated with 1 mM L-alanine, 10 mM lactate, 1 mM succinate, and various concentrations (10(-11) to 10(-6) M) of recombinant bovine GH (bGH). Production of glucose increased as a function of time for 120 min. Bovine growth hormone (10(-6) M) increased glucose production at 120 min by 55 +/- 16%. Significant enhancement of glucose production occurred in suspensions of segments incubated with as little as 10(-10) M bGH. Half-maximal stimulation occurred at between 10(-9) and 10(-8) M. To ascertain whether these actions of bGH are mediated directly, we determined the effects of insulin-like growth factors (IGFs) I and II on glucose production. Addition of IGF-I to segments enhanced glucose production in a concentration-dependent manner. However, incubation with bGH did not induce measurable IGF-I production in the segments. In contrast to the action of IGF-I, IGF-II did not affect glucose production. We conclude that bGH acts directly on cells within proximal tubular segments to enhance gluconeogenesis. Stimulation of gluconeogenesis in vitro could reflect a counterregulatory action of GH exerted on renal proximal tubule in vivo.
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发表时间: 1980
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影响因子: --
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