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- Title
Increasing glucagon secretion could antagonize the action of exogenous insulin for glycemic control in streptozocin-induced diabetic rhesus monkeys.
- Authors
Sirong He; Dan Wang; Yanrong Lu; Younan Chen; Xi Jin; Chengsi Wang; Jingming Zhao; Yan Ren; Li Wang; Hongxia Li; Jingqiu Cheng
- Abstract
Although intraislet insulin signaling is known to play a critical role in regulating glucagon secretion, it is unknown whether abnormal glucagon secretion influences the hypoglycemic effect of exogenous insulin with intraislet insulin deletion. We performed a longitudinal study using 16 streptozocin (STZ)-induced diabetic rhesus monkeys to explore α-cell function under the absence β-cells and to assess whether increasing glucagon secretion antagonizes the action of exogenous insulin for glycemic control. We found that although the α-cells were impaired and the basal secretion levels of glucagon decreased rapidly after STZ (80-90 mg/kg) administration, as based on long-term observation post-STZ injection, glucagon secretion and the number of α-cells were increased. Glycemic control was increasingly difficult, the insulin resistance (HOMA-IR) index was significantly higher, and the triglycerides (TG) levels were gradually decreased. Moreover, a significant correlation between the levels of glucagon and HOMA-IR was found. Under the long-term absence of β-cells, the inhibitory effect on α-cell activity is profoundly attenuated, leading to an increase in glucagon secretion and the amount of α-cells and even α-cell dysfunction. Increased glucagon levels have a serious impact on the insulin sensitivity in vivo and result in an antagonization of the hypoglycemic effect of exogenous insulin.
- Publication
Experimental Biology & Medicine, 2013, Vol 238, Issue 4, p385
- ISSN
1535-3702
- Publication type
Article
- DOI
10.1177/1535370213477974