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These antibodies are known to also occur in people who do not take statin medications. [3] Conversely, these antibodies are absent in people who take statin medications but do not have myopathy. Thus, the presence of anti-HMG CoA reductase antibodies in someone who uses a statin and has myopathy strongly supports the diagnosis. [3]
Because statins are similar in structure to HMG-CoA on a molecular level, they will fit into the enzyme's active site and compete with the native substrate (HMG-CoA). This competition reduces the rate by which HMG-CoA reductase is able to produce mevalonate, the next molecule in the cascade that eventually produces cholesterol.
HMG-CoA reductase (3-hydroxy-3-methyl-glutaryl-coenzyme A reductase, official symbol HMGCR) is the rate-controlling enzyme (NADH-dependent, EC 1.1.1.88; NADPH-dependent, EC 1.1.1.34) of the mevalonate pathway, the metabolic pathway that produces cholesterol and other isoprenoids.
Statins, also known as beta-hydroxy-beta-methylglutaryl-Coenzyme A (HMG-CoA) reductase inhibitors, are the first-line drugs for hypercholesterolaemia. [19] Examples of this drug class are atorvastatin, rosuvastatin, fluvastatin, simvastatin, pravastatin and lovastatin.
Statins (HMG-CoA reductase inhibitors) are particularly well suited for lowering LDL, the cholesterol with the strongest links to vascular diseases. In studies using standard doses, statins have been found to lower LDL-C by 18% to 55%, depending on the specific statin being used.
HMG-CoA reductase, the rate-limiting enzyme of the HMG-CoA reductase pathway, the metabolic pathway responsible for the endogenous production of cholesterol. Statins are more effective than other lipid-regulating drugs at lowering LDL-cholesterol concentration, but they are less effective than the fibrates in reducing triglyceride concentration ...
Like all statins, pravastatin works by inhibiting HMG-CoA reductase, an enzyme found in liver that plays a role in producing cholesterol. [5] Pravastatin was patented in 1980 and approved for medical use in 1989. [6] It is on the World Health Organization's List of Essential Medicines. [7] It is available as a generic medication. [5]
This part will bind to the HMG-CoA reductase making it unavailable for HMG-CoA. [6] Cerivastatin is a pure synthetic drug, produced to create a more potent inhibitor of HMG-CoA reductase. Cerivastatin was the most potent inhibitor with an inhibitory constant of 0.5 μg/L, which made it already effective at a low dose.
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