ArticleJournal of physiology and biochemistry2017
Diet-induced hypercholesterolemia alters liver glycosaminoglycans and associated-lipoprotein receptors in rats.
Article in Journal of physiology and biochemistry, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Glycosaminoglycans (GAGs) play an important role in lipoprotein metabolism. In liver, it facilitates the uptake of remnants through receptor-independent endocytosis. However, changes in liver GAGs during diet-induced hypercholesterolemia with normal levels of fat feeding are unknown. Present paper highlights the effect of diet-induced hypercholesterolemia with normal levels (5%) of fat on liver GAGs and other associated lipoprotein receptors. Hypercholesterolemia was induced in rats by feeding diet supplemented with 0.5% cholesterol and 0.125% bile salts. Hypercholesterolemia showed significantly decreased GAGs of both heparan sulfate (HS) and chondroitin sulfate/dermatan sulfate (CS/DS) classes of molecules. Quantitative real-time polymerase chain reaction analysis of GAG biosynthetic enzymes and other genes revealed significant changes in expression profile. The decrease in GAGs was prevented by simvastatin treatment; a drug that inhibits endogenous cholesterol synthesis that was used as a positive control in our study. Furthermore, there was a comparatively decreased binding of GAGs from hypercholesterolemic rats to lipoprotein lipase. LRP1 which plays a major role in lipoprotein uptake was also significantly decreased, and it was attenuated in simvastatin-treated hypercholesterolemic rats. Furthermore, LDLR and ApoE were also decreased significantly in liver of hypercholesterolemic rats. Thus, diet-induced hypercholesterolemia results in dysregulation of cholesterol homeostasis apparently through changes in GAGs in conjunction with other associated players.
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