Abstract:
:Patients with homozygous familial hypercholesterolemia (HoFH) represent the most severe patients within the spectrum of dyslipidemias. Untreated Low-Density Lipoprotein Cholesterol (LDL-C) levels in these patients are usually in the range 500 to 1200 mg/dL. Moreover, these patients exhibit a scarce responsiveness or even non responsiveness to oral lipid lowering agents. Patients with heterozygous familial hypercholesterolemia (HetFH) tend to have untreated LDL-C levels of 250-500 mg/dL. Many of these patients are responsive to 3-hydroxy-3-methylglutaryl-coenzyme A (HMGCoA-reductase) inhibitors (statins) and/or other specific drugs. Unfortunately, a significant subset of these patients (5-10%) have a severe and/or refractory form of HetFH and after current maximal oral therapy, they remain significantly far from treatment goals (The National Cholesterol Education Program (NCEP) ATPIII guidelines). This would be defined as LDL-C levels of ≥ 190 mg/dL - prior Coronary Heart Disease (CHD) or CHD equivalent - or ≥ 250 mg/dL (no prior CHD or CHD risk-equivalent). The only current therapy option for these patients is Low Density Lipoprotein-apheresis (LDL_a). While LDL_a is very effective in reducing LDL-C, many patients do not receive this extracorporeal therapy because of costs and limited availability of LDL_a centers. Recently, new potent lipid-lowering drugs have been developed and are currently under investigation. Proprotein convertase subtilisin/kexin type 9 (PCSK9) plays a critical role controlling the levels of LDL-C. Studies have demonstrated that PCSK9 acts mainly by enhancing degradation of the Low-Density Lipoprotein receptor (LDLR) protein in the liver. Inactivation of PCSK9 in mice reduces plasma cholesterol levels. Since the loss of a functional PCSK9 in human is not associated with apparent deleterious effects, this protease is becoming an attractive target for lowering plasma LDL-C levels either alone or in combination with statins. Mipomersen, an apolipoprotein B (ApoB) synthesis inhibitor, for lowering of LDL-C showed to be an effective therapy to reduce LDL-C concentrations in patients with HoFH who are already receiving lipid-lowering drugs, including high-dose statins. Lomitapide is a potent inhibitor of microsomal triglyceride transfer protein and is highly efficacious in reducing LDL-C and triglycerides (TG). Lomitapide is currently being developed for patients with HoFH at doses up to 60 mg/d. These new powerful lipid-lowering drugs might be possibly superior than available hypolipidemic agents. Their mechanisms of action, effectiveness, safety, and indication in severe, genetically determined dyslipidemias, are reviewed.
journal_name
Curr Med Chemjournal_title
Current medicinal chemistryauthors
Stefanutti C,Morozzi C,Di Giacomo Sdoi
10.2174/092986712803341485subject
Has Abstractpub_date
2012-01-01 00:00:00pages
4861-8issue
28eissn
0929-8673issn
1875-533Xpii
CMC-EPUB-20120903-2journal_volume
19pub_type
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