Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Abnormal triglyceride accumulation in the liver (hepatic steatosis) leads to insulin resistance, which is trademark trigger of type 2 diabetes. Insulin-resistant hepatocytes perform gluconeogenesis even in the presence of high blood glucose levels, which exacerbates the hyperglycemia. These insulin-resistant cells also perform excessive b-oxidation, which can lead to ketoacidosis.

Insulin normally suppresses lipolysis, and thus insulin-resistant adipocytes release too many fatty acids into circulation, many of which are taken up by hepatocytes and esterified into triglyceride. Thus, insulin resistance further exacerbates hepatic steatosis, which will in turn worsen insulin resistance in the liver.

Given this vicious cycle, abatement of hepatic steatosis is one of the mainstays of diabetes treatment. Metformin is one such treatment and works by activating fatty acid degradation and inhibiting fatty acid synthesis. Which of the following could be the mechanism of action of metformin?

(A) activation of protein phosphatase 2A
(B) AMP mimic that binds to the AMPK allosteric site
(C) ATP mimic that binds to the AMPK allosteric site
(D) increased movement of citrate into the cytoplasm
(E) malonyl CoA mimic that binds to the CAT-1 allosteric site

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