Wu M, Wang X, Duan Q, Lu T. Arachidonic Acid Can Significantly Prevent Early Insulin Resistance Induced by a High-Fat Diet.
ANNALS OF NUTRITION AND METABOLISM 2007;
51:270-6. [PMID:
17622786 DOI:
10.1159/000105448]
[Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2006] [Accepted: 01/25/2007] [Indexed: 12/31/2022]
Abstract
AIM
To investigate whole-body metabolic disorder and hepatic glucose output (HGO) disturbance in rats with insulin resistance induced by a short-term high-fat diet, and the effect of arachidonic acid (AA).
METHODS
Twenty-four normal male Wistar rats (230-250 g) were randomly divided into 3 groups according to their weight and fed for 12 weeks: control group, n = 8, fed with standard chow diet; high-fat (HF) group, n = 8, fed with a high-fat diet; HF+AA group, n = 8, fed with a high-fat diet and administered orally 3 mg x kg(-1) x day(-1)AA.
RESULTS
Early insulin resistance was successfully induced in HF-fed rats with hyperinsulinemia (p < 0.05), higher plasma triglyceride (TG) (p < 0.05), higher fasting liver glycogen content (p < 0.01) and higher glucose-insulin index (p < 0.01) during an oral glucose tolerance test (OGTT). The AA treatment significantly decreased the glucose-insulin index (p < 0.01), blood TG (p < 0.05) and glycogen content (p < 0.05) in liver. Both activity of phosphoenolpyruvate carboxykinase (PEPCK) (p < 0.05) and mRNA levels of PEPCK (p < 0.05) and glucose-6-phosphatase (G-6-Pase) (p < 0.01) in liver were also observed to be significantly decreased. But there were significant differences in the glucose-insulin index (p < 0.01) during OGTT, and glycogen content (p < 0.01) between the HF+AA and control groups.
CONCLUSION
AA can significantly prevent whole-body insulin resistance induced by a high-fat diet, as well as accompanied HGO disturbance in the overnight fasting state, but not thoroughly.
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