alexa Activation of I(2)-imidazoline receptors may ameliorate insulin resistance in fructose-rich chow-fed rats.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Ko WC, Liu IM, Chung HH, Cheng JT

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Abstract Agmatine, an endogenous ligand of imidazoline receptors, was employed to screen the effect on insulin resistance in rats induced by a diet containing 60\% fructose. Single intravenous (i.v.) injection of agmatine sulfate for 30min decreased the plasma glucose concentrations in a dose-dependent manner from 0.5mg/kg to 3mg/kg in rats received 4-week fructose-rich chow without an alteration of systolic blood pressure. The plasma glucose lowering action of agmatine (1mg/kg, i.v.) was abolished by the pretreatment with BU224 (1mg/kg, i.v.) at sufficient dosage to block I(2)-imidazoline receptors. In addition, the value of glucose-insulin index, the areas under the curve of glucose and insulin during the intraperitoneal glucose tolerance test, showing an index of in vivo insulin sensitivity was reversed by the same treatment with agmatine in fructose-rich chow-fed rats; this action was also blocked by BU224. Our results suggest that activation of I(2)-imidazoline receptor to improve insulin action on glucose disposal can be considered for targeting glucose metabolism under insulin-resistant state. This article was published in Neurosci Lett and referenced in Journal of Diabetes & Metabolism

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