期刊
BIOCHEMICAL PHARMACOLOGY
卷 75, 期 12, 页码 2325-2333出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bcp.2008.03.011
关键词
dipeptidylpeptidase-IV (DPP-IV); glucose-dependent insulinotropic polypeptide (GIP); GIP analogue; glucose homeostasis; insulin secretion; PEGylation; mini-PEG [mPEG]
Glucose-dependent insulinotropic polypeptide has been proposed as a Potential therapeutic for type 2 diabetes, however, efforts to bring forward this drug have been hindered due to its short circulating half-life. We have adopted a novel strategy to increase potency and prolong GIP action through C-terminal mini-PEGylation (GIP[mPEG]). In contrast to GIP, GIP[mPEG] was resistant to dipeptidylpeptidase-IV (DPP-IV) up to and including 24 h. Both GIP(mPEGJ and GIP concentration-dependently stimulated CAMP production (EC50 6.6 and 0.7 nM, respectively) and insulin secretion (p < 0.01 to p < 0.001) in pancreatic BRIN-BD11 cells. Acute injection of GIP[mPEG] together with glucose to high fat fed mice significantly lowered plasma glucose (p < 0.05) and increased plasma insulin responses (p < 0.05). Furthermore, GIP[mPEGJ markedly lowered plasma glucose when administered 4-24 h prior to a glucose load (p < 0.05). Daily administration of GIP[mPEGJ for 20 days in high fat mice did not alter body weight, food intake or non-fasting plasma insulin, however, non-fasting plasma glucose concentrations were significantly lowered (p < 0.05). Moreover, glucose tolerance was significantly improved (p < 0.05) together with glucose-mediated plasma insulin responses (p < 0.05). Insulin sensitivity, pancreatic insulin content, triglyceride and adiponectin levels were not changed. in summary, these data demonstrate that C-terminal mini-PEGylation of GIP is a useful strategy to prolong metabolic stability and, improve biological action thus representing a novel therapeutic option for type 2 diabetes. (C) 2008 Elsevier Inc. All rights reserved.
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