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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ayokunle Olubaniyi, M.B,B.S [2]

Overview

There is an association between the concentration of circulating LDL cholesterol (LDL-c) and the risk of cardiovascular disease. There is an unmet need for more effective and tolerable therapies for the reduction of LDL-c. Ongoing studies are evaluating novel lipid-lowering therapeutic strategies, including anti-sense oligonucleotides (ASOs) to apolipoprotein B (apo B), proprotein convertase subtilisin/kexin type 9 (PCSK9), microsomal triglyceride transfer protein (MTP), thyromimetics, squalene synthase, adenosine triphosphate-citrate lyase, AMP-activated protein kinase, and sterol regulatory element binding proteins.

The Unmet Need Driving Research Towards a Lower LDL Cholesterol Goal

Although the relative rate of death attributable to cardiovascular disease has declined by 32.7% in the past decade, the disease burden remains high. Cardiovascular disease (CVD) accounts for 1 out of every 3 deaths in the United States,[1] with direct medical costs due to CVD estimated to triple by 2030.[2] LDL cholesterol is a major determinant of atherosclerotic CVD and has been an important target for improving cardiovascular outcomes.[3] The abundance of data on statins (HMG CoA reductase inhibitors) for the primary and secondary prevention of CVD has contributed to their universal adoption as first-line therapies for LDL-C reduction. However, approximately 40% and 80% of individuals with high- and very-high cardiovascular risk, respectively, do not achieve their LDL-C goals with optimal doses of statins. [4] With data demonstrating that a lower limit for LDL-C reduction may not be applicable (particularly that values lower than those achieved with statins alone are associated with a further reduction in cardiovascular events[5]), and given the 5-10% rate of statin-associated myalgia that has been linked to higher doses, as well as more potent statins, there seems to be a growing need for new therapeutics that effectively and safely reduce LDL cholesterol, and are associated with a reduction in cardiovascular events. [6]

Investigational Therapies

PCSK9 Inhibitiors

The function of PCSK9 was first described in 2003 when a gain-of-function mutation of PCSK9 gene (leading to increased activity) was associated with familial hypercholesterolemia in 4 french families.[7] The association was further clarified in 2005 after the discovery of loss-of-function mutations of PCSK9 in patients with low LDL-C. This loss-of-function was linked to a 40% reduction in plasma levels of LDL-C in the studied population.[8] PCSK9 has a major role in the metabolism of hepatic cholesterol. It is a serine protease that binds to the epidermal growth factor-like repeat A (EGF-A) domain of the low-density lipoprotein receptor (LDLR), inducing LDLR degradation in the lysosomes. Reduced LDL receptor levels result in decreased metabolism of low density lipoprotein (LDL), which could lead to hypercholesterolemia.[9] The sterol regulatory element-binding protein-2 (SREBP-2), which is activated in the presence of low intracellular levels of cholesterol, also induces the expression of PCSK9, thereby increasing the amount of circulating LDL-cholesterol.[10] Several drugs have been investigated for the inhibition of PCSK9, and have demonstrated a more potent lowering of LDL cholesterol levels than the current available drugs. Phase II and phase III trials have demonstrated good tolerability and efficacy in lowering LDL choleterol, with exploratory analyses demonstrating a reduction in cardiovascular events[11]. Although it is biologically plausible that this reduction in LDL would also lead to a reduction in atherothrombotic events, additional clinical trials are ongoing to determine the efficacy of PCSK9 inhibitors in improving CV outcomes.[12][13][14][15]

PCSK9 Function  
Pharmacologic Interventions for PCSK9 inhibition  


For more information regarding this approach to lipid management, click here.
For details about specific agents, click on the following links: Alirocumab, Evolocumab, Bococizumab

Microsomal Triglyceride Transfer Protein (MTP) Inhibition

Microsomal triglyceride transfer protein is an endosomal protein found in the hepatocytes and intestinal enterocytes. It catalyses the transfer of cholesterol esters and triglycerides to nascent apo B, leading to the formation of chylomicron and VLDL in the intestine and hepatocyte, respectively.[16] Chylomicrons and other apo-B48-containing remnant lipoproteins are essential for intestinal fat absorption and its transfer to peripheral tissues. Mutations of the MTTP gene leads to a condition known as abetalipoproteinemia, which causes an absence of apo-B-containing lipoproteins and very low levels of LDL-C and triglycerides.[17][18] Individuals with this recessive condition have severe intestinal malabsorption of fat and fat-soluble vitamins (A, D, E, K) manifesting as fatty liver, night-blindness, rickets or osteomalacia, neuropathy, ataxia, and coagulopathy.

Several MTP inhibitors are being investigated:

  • Non-intestinal-specific agents
    • Lomitapide (AEGR-427, previously known as BMS-201038 - Bristol-Myers-Squibb) by Aegerion Pharmaceuticals
    • Implitapide (formerly AEGR-427 or Bayer BAY-13-9952)
    • CP-34086 by Pfizer
  • Intestinal-specific agents
    • Dirlotapide by Pfizer
    • JTT-130 and SLx-4090 by Surface Logix.

Early clinical trials that enrolled patients with homozygous familial hypercholesterolemia demonstrated up to 50% reductions in total cholesterol, LDL-C and apo B with MTP inhibition.[19] However, higher doses were associated with transient elevations in liver transaminases and hepatic fat accumulation. Further developments of CP-34086 and implitapide have been placed on hold due to their hepatic adverse effects. Intestinal-specific agents such as dirlotapide, JTT-130, and SLx-4090 were developed to prevent the hepatic effects of the non-specific agents. Thus far, these agents are still early in human clinical trials (except dirlotapide), but several reports have demonstrated significant reductions in postprandial triglyceridemia and total cholesterol in preclinical studies.[20] Intestinal-specific MTP inhibitors may be effective in treating hyperchylomicronemia but their efficacy as LDL-C lowering agents is uncertain.

MTP Inhibitors
Adapted from Nature Reviews Cardiology, 8(5): 253-265 (May 2011).[21]

Apolipoprotein B Inhibitors

Apolipoprotein B (apo B) is a large protein that is present in all atherogenic lipoproteins i.e., VLDL, LDL, IDL. There is a single copy of apo B-100 in all these lipoproteins, therefore, plasma levels of apo B-100 are proportionate to the concentration of circulating atherogenic lipoproteins and are associated with a higher cardiovascular risk.[22] Apo B exists in two main isoforms, apo B100 and apo B48. The liver synthesizes apo B-100, whereas the small intestine synthesizes apo B48. Apo B100 serves two main functions - (1) it provides structural stability to the circulating lipoproteins, and (2) it acts as a ligand for LDL receptors (LDLR). On the other hand, apo B48 is a unique structural protein of chylomicrons that originate from the small intestine. The removal of LDL particles from the plasma involves the binding of apo B to LDLR, then, the resulting apo B-100-LDLR complex gets internalized into the hepatocyte for processing.[23] Mutations that lower the affinity of apo B-100 for LDLR result in decreased clearance of LDLs, a condition known as familial defective apo B, which is associated with an increased risk of atherosclerotic cardiovascular diseases.[24] In contrast, mutations in apo B that decrease its translation or secretion have been demonstrated to reduce circulating LDL-C and improve cardiovascular risk.[25] All of these observations have led to the development of therapeutic strategies that target Apo-B for the reduction of LDL cholesterol.

ISIS 301012 or mipomersen

ISIS 301012 or mipomersen, by ISIS Pharmaceuticals, is a second-generation 20 nucleotide antisense oligoneucleotide (ASO) which selectively inhibits apo B gene expression via RNAse H activation.[26] ASOs are short, deoxyribonucleotide strands which bind to the targeted mRNAs to inhibit their translation leading to their enzymatic degradation by ribonuclease (RNAse H or argonaute 2), thus inhibiting gene expression.[27] Phases I and II clinical trials of ISIS301012 have demonstrated a dose-dependent reduction in plasma apo B levels by approximately 40% and up to 50% reduction in LDL-C with subcutaneously administered ISIS-301012 or mipomersen, even among patients with defective LDLRs.[28][29][30] Furthermore, a randomized phase III trial that enrolled homozygous familial hypercholesterolemia patients demonstrated a 15% elevation in HDL-C.[31] Despite its efficacy in lowering LDL-C, mipomersen did not receive approval due to a significant increase in adverse effects - injection site reactions (80-100% of patients), flu-like illness, and 3-fold elevation in liver transaminases (15%).

Antisense RNA
Adapted from Nature Reviews Cardiology, 8(5): 253-265 (May 2011) and Pharmacology & Therapeutics, 135(1): 31-43 (July 2012)[21][32]

Thyromimetics

The association between thyroid hormones and cholesterol metabolism was first discovered in the 1930s, and its use as a cholesterol lowering agent has been investigated in several studies.[33][34][35] However, the development of thyromimetic agents was set back by the associated increase in cardiovascular events, thought to be related to contamination of the thyromimetic agent investigated with levothyroxine (LT4), as well as the discovery of statins.[36][37] The discovery of thyroid hormone receptors (TRs) restored some of the investigations into thyromimetics for the reduction of LDL-C. There are two main TRs in humans:

  • TRα receptors (TRα 1 & 2). TRα 1 is predominantly in the muscles and adipose tissue; also mediates the cardiovascular responses to thyroid hormones such as tachycardia.[38]
  • TRβ receptors (TRβ 1 & 2). TRβ 1 is mainly in the liver and it regulates cholesterol homeostasis.[38] Therefore, the development of TRβ 1-specific thyromimetic would be a promising method of cholesterol management devoid of cardiac effects.[39][40]

Some of the proposed mechanisms of action of these agents include:

  • Upregualtion of hepatic LDLR expression by TRβ.[41][42]
  • Stimulation of bile acid synthesis through the upregulation of the rate-limiting enzyme, cholesterol 7-hydroxylase [CYP7A1])
  • Stimulation of biliary excretion (through increased expression of ATP-binding cassette proteins G5/G8 [ABCG5/G8]
  • Promotion of reverse cholesterol transport which ultimately increases the formation of HDL, enhances cholesteryl ester transfer protein (CETP) activity, and increases scavenger receptor B-I (SR-BI) activity for the uptake of cholesterol.

Examples of TRβ 1-specific thyromimetics that had been investigated include:

  • DITPA (3,5-diiodothyropropionic acid) - terminated
  • Eprotirome (KB2115)[43] by Karo Bio AB.
  • Sobetirome (GC-1)
  • MB07811
  • KB-141
  • T-0681

Squalene Synthase Inhibition

Similar to the statins (3-hydroxy-3-methylglutaryl-CoA reductase inhibitors), inhibitors of squalene synthase prevent the conversion of farnesyl pyrophosphate to squalene at a point on the HMG-CoA-Mevalonate pathway which represents the commitment of cholesterol intermediates to the synthesis of cholesterol. Squalene synthase inhibitors have been shown to inhibit cholesterol production, reduce triglyceride synthesis and apoB secretion, increase LDL receptor expression and LDL uptake in HepG2 cells.[44] However, they are less likely to be associated with the adverse myopathic effects commonly observed with statins because they do not cause depletion of isoprenoid intermediates within the cholesterol biosynthesis pathway, and as a result, they do not limit the prenylation or lipidation (addition of hydrophobic molecules to a protein) of membrane-directed proteins.[45]

TAK-475 (lapaquistat acetate) by Takeda Pharmaceuticals was the first squalene synthase inhibitor to reach phase III clinical trials for the treatment of hypercholesterolemia in the United States and Europe. Randomized, double-blinded, placebo and actively controlled, parallel-group studies involving TAK-475 alone and in combination with atovastatin were associated with a dose-dependent reduction of LDL-C up to 27% and 19% when compared with placebo and when combined with atovastatin, respectively in healthy human volunteers. Recent animal studies have demonstrated a protective effect against statin-induced myopathy when isoprenoid intermediates are replenished directly or by the use of TAK-475 given with high-dose statins.[46] Results from these studies further underscore squalene synthase inhibitors as potential drugs to clinically prevent statin-induced myopathies.

Phase III multi-centered clinical trials are on-going to compare TAK-475 vs simvastatin alone or in combination, vs. ezetimibe, and as add-on in patients already on atorvastatin, rosuvastatin, or a low or high-dose statin. It will also be investigated as add-on treatment in patients with homozygous familial hypercholesterolemia, and in patients with type 2 diabetes.

Inhibition of ACL and Activation of AMPK

ETC-1002 (8-hydroxy-2,2,14,14-tetramethylpentadecanedioic acid), by Esperion Therapeutics, is a small molecule which regulates lipid and carbohydrate metabolism. It modulates the activity of two distinct molecular targets - hepatic adenosine triphosphate-citrate lyase (ACL) and AMP-activated protein kinase (AMPK).[47] It works by:

  • Inhibition of ACL - Inhibition of adenosine triphosphate-citrate lyase, an enzyme responsible for the production of ATP citrate, reduces the levels of acetyl co-enzyme A (acetyl-CoA - an important precursor to HMG-CoA which is a vital component in cholesterol and ketone synthesis). It acts on the lipid synthesis pathway upstream of HMG CoA reductase - the molecular targets of statins.[48]
  • Activation of adenosine monophosphate activated protein kinase (AMP-activated protein kinase) - AMP-activated protein kinase is a functional enzyme present in the liver, striated muscle, and the brain. It plays a key role in cellular energy homeostasis. It acts as a sensor of the energy-depleted form of ATP (i.e., AMP), and its activation results in stimulation of hepatic fatty acid oxidation and ketogenesis, inhibition of cholesterol synthesis, lipogenesis, and triglyceride synthesis, inhibition of adipocyte lipolysis and lipogenesis, stimulation of skeletal muscle fatty acid oxidation and muscle glucose uptake,[49] and modulation of insulin secretion by pancreatic beta-cells.[50]

In a phase II clinical trial involving 177 patients, ETC-1002 was shown to have a dose-dependent reduction of up to 27% in LDL-C (compared with placebo) observed with the maximum dose (120mg), devoid of serious adverse effects.[48] This approach may represent a new target mechanism to reducing LDL-C, but additional studies are required to determine the safety due to its high possibility of producing similar adverse effects as statins.

Inhibition of SREBP-1

Sterol regulatory element binding proteins (SREBPs) are transcription factors required in the activation of genes involved in cholesterol and fatty acid biosynthesis. Fatostatin, a diarylthiazole derivative, was observed to impair the activation of SREBPs, thereby decreasing the transcription of lipogenic genes in cells.[51] More studies are required regarding the efficacy of this potential target in reducing circulating LDL-C since it also induces the expression of PCSK9 - a serine protease which promotes degradation of LDLR, thereby preventing the clearing of LDL particles from the plasma.

Summary Table

Class Drug Company Agent Name Mechanism of Action Efficacy on Lowering LDL-C Route of Administration Adverse Effects Published Clinical Trials
Inhibition of Apo B/Antisense oligonucleotides ISIS Pharmaceuticals ISIS-301012 or Mipomersen Inhibits apo B mRNA gene expression Up to 50% reduction Subcutaneous injection (SC) Injection site reactions, flu-like illness, 3-fold asymptomatic elevation of liver transaminases Phase I, II, III
PCSK9 Inhibition Merck, Sanofi-Aventis–Regeneron, Pfizer–Rinat, Amgen, Santaris, Alnylam, Medicines company, ISIS, Adnexus, Roche/Genentech, Novartis AMG 145, SAR236553/REGN727, RN316, 1D05-IgG2, RG7652, LGT-209, 1B20, J10, J16, J17 Inhibition of PCSK9 which promotes degradation of LDLR 38% reduction in LDL-C in animal studies ASO (SC), monoclonal antibody (SC), SiRNA (IV) Phase I, II, III
MTP Inhibition Aegerion Pharmaceuticals, Pfizer, Surface Logix Intestinal non-specific (lometapide, implitapide, CP-34086); Intestinal-specific (SLx-4090, dirlotapide, JTT-130) Inhibits Microsomal triglyceride transfer protein Lometapide (up to 50%), CP-34086 (up to 70%) PO Intestinal non-specific agents causes GI adverse effects, increases in hepatic fat Lometapide (Phase I, II, III), JTT-130 (Phase I, II)
Thyromimetics Karo Bio AB DITPA, eprotirome, sobetirome (GC-1), MB07811, KB-141, T-0681 TRβ1-selective Up to 32% reduction of LDL-C PO Adverse cardiac effects Phase II
Squalene Synthase Inhibitors Takeda TAK-475 Inhibits squalene synthase in the HMG CoA-Mevalonate pathway Up to 27% reduction in LDL-C Phase II
Inhibition of ACL and Activation of AMPK Esperion ETC-1002 Regulation of lipid and carbohydrate metabolic subtrates Up to 27% reduction in LDL-C No serious adverse effects Phase II
Inhibition of SREBP-1 Inhibition of SREBP-1 Impair the activation of SREBPs, thereby decreasing the transcription of lipogenic genes in cells

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