Dynamics of insulin hypersecretion by obese Zucker rats.

Dynamics of insulin hypersecretion by obese Zucker rats.
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肥胖 Zucker 大鼠胰岛素分泌过多的动态。

DOI:
10.1016/0026-0495(85)90100-3
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发表时间:
1985
期刊:
Metabolism: clinical and experimental
影响因子:
--
通讯作者:
Stern,JS
Stern,JS
中科院分区:
--
文献类型:
--
作者:
Curry,DL;Stern,JS

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研究了肥胖与胰腺分泌胰岛素过多的关系。我们发现肥胖Zucker大鼠的胰腺分泌的胰岛素明显多于瘦Zucker大鼠。在300 mg/dL的葡萄糖刺激下,肥胖大鼠和瘦大鼠的总体动态双相胰岛素分泌谱是相似的。肥胖大鼠和瘦肉大鼠胰腺中葡萄糖-胰岛素剂量反应关系的进一步研究表明,肥胖大鼠胰腺的胰岛素高分泌在正常血糖和低血糖水平下尤为明显(因子高达14倍)。这种高分泌是如此惊人,以至于表明在正常血糖状态下,肥胖的动物可能缺乏随时“关闭”胰岛素分泌的能力,而瘦弱的动物却有这种能力。在低血糖状态下(75 mg/dL),高分泌是短暂的,胰岛素分泌在灌注30分钟后恢复到正常的基础水平。因此,这种高分泌现象在体内发生的程度仍有待确定。
The relationship between obesity and hypersecretion of insulin by the pancreas was studied. We found that pancreata from obese Zucker rats secrete significantly more insulin than do pancreata from lean Zucker rats. At a glucose stimulation of 300 mg/dL, the overall dynamic biphasic insulin secretory profiles from obese and lean rats were similar. Further studies to investigate the glucose-insulin dose response relationship in obese and lean rat pancreata demonstrated insulin hypersecretion by pancreata from obese rats which was particularly pronounced at normoglycemic and hypoglycemic levels (by factors as much as 14-fold). This hypersecretion is so striking as to suggest that in the intact state the obese animal may lack the ability to readily “shut off” its insulin secretion under normoglycemic conditions, whereas lean animals possess such an ability. Under hypoglycemic conditions (75 mg/dL), the hypersecretion is transient and insulin secretion returns to normal basal levels after 30 minutes of perfusion. Thus the degree to which this hypersecretory phenomenon may occur in vivo remains to be established.
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