Muscarinic stimulation and antagonism and glucoregulation in nondiabetic and obese hyperglycemic mice.

Published

Journal Article

Plasma glucose and insulin responses to a muscarinic agonist (bethanechol chloride) and a muscarinic antagonist (atropine) were evaluated in obese C57BL/6J ob/ob mice and in lean C57BL/6J + /? mice. In lean +/? mice, plasma glucose decreased in response to 1 and 2 micrograms/g bethanechol chloride, whereas insulin increased significantly. In ob/ob mice, insulin increased remarkably in response to bethanechol administration (saline, 632 +/- 80 microU/ml; 2 micrograms/g bethanechol chloride, 1794 +/- 97 microU/ml; n = 10), but surprisingly, plasma glucose also rose significantly (saline, 230 +/- 14 mg/dl; 2 micrograms/g bethanechol chloride, 363 +/- 18 mg/dl, n = 10). This exaggerated hyperglycemia in ob/ob mice was not associated with significant changes in plasma glucagon. Furthermore, administration of propranolol hydrochloride did not diminish bethanechol chloride-induced hyperglycemia in ob/ob mice. Administration of atropine (2.5, 5, and 10 mg/kg body wt) induced a significant decrease in plasma insulin without changes in plasma glucose in ob/ob mice, whereas neither plasma insulin nor plasma glucose changed in lean mice. Finally, conversion of [14C]alanine to glucose was increased in ob/ob mice after bethanechol chloride administration, indicating that muscarinic stimulation increases gluconeogenesis in an animal model of type II (non-insulin-dependent) diabetes.

Full Text

Duke Authors

Cited Authors

  • Fukudo, S; Virnelli, S; Kuhn, CM; Cochrane, C; Feinglos, MN; Surwit, RS

Published Date

  • November 1989

Published In

Volume / Issue

  • 38 / 11

Start / End Page

  • 1433 - 1438

PubMed ID

  • 2576006

Pubmed Central ID

  • 2576006

International Standard Serial Number (ISSN)

  • 0012-1797

Digital Object Identifier (DOI)

  • 10.2337/diab.38.11.1433

Language

  • eng

Conference Location

  • United States