alexa Lipoic acid improves hypertriglyceridemia by stimulating triacylglycerol clearance and downregulating liver triacylglycerol secretion.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Obesity & Weight Loss Therapy

Author(s): Butler JA, Hagen TM, Moreau R

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Abstract Elevated blood triacylglycerol (TG) is a significant contributing factor to the current epidemic of obesity-related health disorders, including type-2 diabetes, nonalcoholic fatty liver disease, and cardiovascular disease. The observation that mice lacking the enzyme sn-glycerol-3-phosphate acyltransferase are protected from insulin resistance suggests the possibility that the regulation of TG synthesis be a target for therapy. Five-week-old Zucker Diabetic Fatty (ZDF) rats were fed a diet containing (R)-alpha-lipoic acid (LA, approximately 200mg/kg body weight per day) for 5 weeks. LA offset the rise in blood and liver TG by inhibiting liver lipogenic gene expression (e.g. sn-glycerol-3-phosphate acyltransferase-1 and diacylglycerol O-acyltransferase-2), lowering hepatic TG secretion, and stimulating clearance of TG-rich lipoproteins. LA-induced TG lowering was not due to the anorectic properties of LA, as pair-fed rats developed hypertriglyceridemia. Livers from LA-treated rats exhibited elevated glycogen content, suggesting dietary carbohydrates were stored as glycogen rather than becoming lipogenic substrate. Although AMP-activated protein kinase (AMPK) reportedly mediates the metabolic effects of LA in rodents, no change in AMPK activity was observed, suggesting LA acted independently of this kinase. The hepatic expression of peroxisome proliferator activated receptor alpha (PPARalpha) target genes involved in fatty acid beta-oxidation was either unchanged or decreased with LA, indicating a different mode of action than for fibrate drugs. Given its strong safety record, LA may have potential clinical applications for the treatment or prevention of hypertriglyceridemia and diabetic dyslipidemia.
This article was published in Arch Biochem Biophys and referenced in Journal of Obesity & Weight Loss Therapy

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