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Lipid synthesis is under tight transcriptional control involving sterol regulatory element binding proteins (SREBP1, SREBP2). Rising cellular cholesterol levels prevent SREBP2 from entering the nucleus to directly activate the expression of 3-hydroxy-3-methylglutaryl-coenzyme A reductase (Hmgcr), the key enzyme of cholesterol synthesis. The failure to down-regulate cholesterol synthesis in gallstone-susceptible...
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