High density lipoprotein future or investigational therapies
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The association between high density lipoprotein (HDL) level and cardiovascular disease has been widely reported in the literature. In fact, 1 out of every 7 statin treated patients has residual cardiovascular disease, which sheds light on the importance of developing new therapies targeting HDL quantity and quality in high risk patients.
The Unmet Need Driving Research Into Raising HDL
The importance of increasing the serum levels and functionality of HDL in order to lower residual cardiovascular risks among patients with acute coronary syndromes cannot be over-emphasized. First of all, some recent studies reported the failure of orally active medications that increase serum levels of HDL-C, such as niacin in the AIM-HIGH Trial, to potentially improve cardiovascular outcomes. These findings have shifted the scope of HDL therapy from the quantitative elevation of serum HDL-C towards the qualitative improvement of the functionality of HDL i.e., cellular cholesterol efflux, HDL-mediated reverse cholesterol transport mechanism, associated enzymatic activities, particle size and its electrophoretic mobility, anti-inflammatory, and anti-oxidant properties. Secondly, since the available oral medications require weeks to months to elevate HDL, there is a need for medications that target HDL and rapidly improve outcomes during acute vascular events.
Shown below is an image depicting the different drug targets to increase HDL levels. Some of these drugs have been used whereas others are still under investigation. Please refer to the text below for a discussion about the future investigational therapies.
Adopted from Nature Reviews Drug Discovery. ABCA1= ATP-binding cassette transporter A1; ABCG1: ATP-binding cassette transporter G1; ABCG4: ATP-binding cassette transporter G4; ApoA-I= Apolipoprotein A-I; CETP: Cholesteryl transfer protein; LCAT: Lecithin cholesterol acyltransferase; LXR: Liver X receptors; PPARγ: Peroxisome proliferator-activated receptor gamma; RXR: Retinoid X recptor; SRBI: Scavenger receptor, class B, type I. 
Infusion of apolipoprotein A1 (apoA-1) via HDL infusion preparations aims at directly increasing the serum levels of HDL. The HDL infusion preparations are synthesized by combining apoA-1 and other HDL proteins along with phospholipids. There are two types of HDL infusion formulations that differ by the nature of apoA-1 used: the recombinant HDL (rHDLs) and the reconstituted HDL. While the apoA-1 of the recombinant HDLs is derived from cellular expression systems, the apoA-1 constituent of the reconstituted HDLs is derived from human plasma. The reconstituted forms are relatively cheaper and easier to produce.
The previously and currently investigated HDL infusion formulations are characterized by a short duration of action; hence, interest about their use in the setting of ACS has been the focus of several trials. HDL infusion are thought to decrease mortality and improve cardiovascular outcomes of patients with ACS. Shown below is an image depicting the suggested acute and chronic functions of HDL infusions in the setting of cardiovascular disease.
A genetic variant of apo A-1, referred to as apoA-I Milano, was identified in some individuals in rural Italy. This mutant form of apoA-1 conferred some protection against atherosclerosis despite the presence of very low HDL levels (10-30 mg/dl), elevated plasma LDL, and moderate hypertriglyceridemia. Studies indicated that intravenous infusion of recombinant apoA-I Milano (ETC-216, now MDCO-216 since 2009) promoted the regression of the atherosclerotic lesions to a greater extent than the wild type apo A-I as measured by intravascular ultrasound (IVUS) within 5 weeks of treatment. However, further studies regarding these agents have been halted by procedural and manufactural difficulties.
CSL-112 (CSL Behring), a reformulated version of CSL-111, is a reconstituted HDL coupled with soybean phosphatidylcholine. CSL-112 has been reported to cause up to 20-fold elevation in serum pre-β-1-HDL following a single infusion according to the phase 1 trial. Results of the phase 2a trial are still pending. ERASE Trial examined the effect and tolerability of CSL-111, a precursor of CSL-112, and demonstarted a regression of the coronary atherosclerotic lesions among ACS patients. ERASE Trial was discontinued due to the abnormal elevation of the liver transaminase reported in the high-dosed group. There was no significant change in atheroma volume (measured by IVUS) despite a 64% increase in HDL and a 23% reduction in LDL.
Two ongoing phase 2 trials from Cerenis Therapeutics are investigating CER-001, an engineered pre-β-like HDL particle. The first trial, CHI-SQUARE Study, is assessing the effect of CER-001 on the total coronary plaque volume (measured by IVUS) in patients with acute coronary syndrome; whereas the second trial, MODE Study, is assessing the effect of CER-001 on total carotid plaque volume (measured by MRI) among patients with homozygous familial hypercholesterolemia.
Cholesterol Ester Transfer Protein (CETP) Inhibition
The goal of this therapy is to prevent the transfer of esterified cholesterol from HDL to triglyceride-rich lipoproteins in exchange for triglycerides. This method does not only increase the cholesterol content per HDL particle, but also affects the composition and serum level of VLDL, VLDL remnants, and LDLs. The cardiovascular benefits of this therapy is unclear due to the failure observed with earlier trials, such as ILLUMINATE trial (torcetrapib) and Dal-OUTCOMES trial (dalcetrapib). The ILLUMINATE trial failed due to observed off-target effects on blood pressure and an increment in the mortality rate. Despite a 31–40% elevation in HDL-C, dalcetrapib failed to demonstrate a positive cardiovascular outcome among patients with ACS. Two other new CETP inhibitors (anacetrapib and evacetrapib) are in phase 3 clinical trials with promising results. Both anacetrapib (MK-0859) and evacetrapib (LY248595) raise HDL levels without affecting the blood pressure. The effects of evacetrapib on cardiovascular outcomes are being evaluated in the Assessment of Clinical Effects of Cholesteryl Ester Transfer Protein Inhibition with Evacetrapib in Patients at a High-Risk for Vascular Outcomes trial (ACCELERATE trial) by Eli Lilly and Company, currently enrolling 11,000 patients after ACS. The expected date of completion is January, 2016. The REVEAL HPS-3/TIMI-55 trial aims to assess whether lipid modification with anacetrapib 100 mg daily reduces the risk of coronary death, myocardial infarction, and coronary revascularization (collectively known as major coronary events) among 30,000 patients with circulatory problems who are treated with a statin to regulate their LDL levels. The expected date of completion is January, 2017.
The CETi-1 vaccine (developed by AVANT Immunotherapeutics) induces antibodies specific for a portion of the cholesteryl ester transfer protein (CETP). Only one patient out of a total of 36 patients who received a single injection of the vaccine developed anti-CETP antibodies. After the study was extended, 53% (8/15) developed anti-CETP antibodies following a second injection of the active vaccine compared with 0% (0/8) in the placebo group. The vaccine was well tolerated and no adverse events were reported. Despite a significant 8.4% increase in HDL among patients not receiving statins, more human studies are needed to determine whether repeated vaccinations induce more antibodies production with subsequent higher elevations in HDL.
JTT-705, a partial inhibitor of CETP, was first tested in human subjects by Japan Tobacco Inc. in 2002. A 4-week study to assess the efficacy and safety of ascending doses of JTT-705 in 198 healthy subjects with mild hyperlipidemia revealed a 37% decrease in CETP activity (P<0.0001), 34% increase in HDL cholesterol (P<0.0001), 7% decrease in LDL cholesterol (P=0.017), an increase in total HDL, HDL2, HDL3, and apolipoprotein A-I. Although minor gastrointestinal side effects were observed, the long-term effect on coronary artery disease needs to be assessed. Better results were observed when JTT-705 was combined with statins, including the preservation of HDL's anti-oxidant properties observed with CETP inhibition.
De-lipidated HDL Infusions
De-lipidated HDL infusion is a relatively new approach which involves autologous infusion of de-lipidated HDL using the Plasma De-lipidation System-2 (PDS-2) produced by Lipid Sciences. The process involves selective removal of apoA-I HDL particles, and de-lipidation (converting α HDL to pre-β-like HDL) reinfusion of the cholesterol-depleted functional pre-β HDL, the active form of HDL. In the first human trial, 28 patients with ACS undergoing cardiac catheterization received 5 weekly infusions of de-lipidated HDL or placebo. This led to a 73.5% increase in pre-beta-like HDL and 71.9% decrease in the α HDL contents of the de-lipidated plasma which was responsible for the 5.2% decrease in the total atheroma volume (measured by IVUS) observed. A third of the patients experienced hypotension due to apheresis.
ApoA-1 Mimetic Peptides
These are short synthetic peptides that mimic the amphipathic α-helix of apoA-I. APP018 by Novartis (formerly developed as D-4F by Bruin Pharma), synthesized from D-amino acids, is resistant to degradation by gastric enzymes, it can therefore be administered orally. In animal models, D-4F has been demonstrated to exert similar effects as native apoA-1, such as cholesterol efflux from macrophages via ABCA1, delivery of cholesterol to hepatocytes via the SCARB1, anti-inflammatory properties, anti-oxidant properties which exceeds native apoA-1 - shows more affinity for oxidized phospholipids and fatty acids, retains the ability to inhibit the production of chemokines, and its anti-platelet properties. All these properties have been demonstrated to translate into atheroprotective effects. Studies in humans have been limited by APP018's limited bioavailability and reports of adverse events independent of the dose. The effect of D-4F on atherosclerosis has not been demonstrated in humans. Other apoA-1 mimetic drugs include 2F, 3F, 5F, 6F, and 7F.
ATI-5261 Synthetic Peptide
ATI-5261 is a synthetic peptide that stimulates ABCA1 cholesterol efflux with a similar potency to that of apoA-I. Studies in mice demonstrated a 45% reduction of aortic atherosclerosis and an increase in the reverse cholesterol transport following daily intraperitoneal injections of ATI-5261 synthetic peptide for 6 weeks. This novel approach currently awaits early phase clinical trials.
Endothelial Lipase Inhibitors
Endothelial lipases, synthesized by vascular endothelial cells, represent a potential target to reduce HDL catabolism thereby increasing the serum levels of HDLs and apoA-1. Some human studies have hypothesized an atherogenic role for endothelial lipases especially in overweight individuals and in those with metabolic syndrome; in fact, there is an association between elevated plasma levels of this enzyme and increased coronary artery calcification. Carriers of endothelial lipase variants associated with HDL-C levels demonstrated a decreased risk of coronary artery disease. Although the inactivation of endothelial lipases was expected to reduce atherosclerosis by raising serum HDL-C levels, the results have been the opposite - resulting into accumulation of small, dense, atherogenic LDLs, despite elevations in serum HDLs. Similar result was also reported in hepatic lipase deficiency. Despite all these negative results, inhibiting EL still remains an object of interest of future therapeutic value. In a study, it was demonstrated that targeted inactivation of EL increased plasma HDL-C level and inhibited atherosclerosis. Examples of drugs include boronic acid inhibitors and selective sulfonylfuran urea.
Lecithin-cholesterol acyltransferase catalyses the esterification of free cholesterol as well as the maturation of HDLs. Therefore, a reduction of its activity will lead to reduced serum levels of HDL-C. Conversely, the effect of LCAT on reverse cholesterol transport and the development of atherosclerosis is controvertial. Some studies have demonstrated a negative cardiovascular outcome with a high LCAT activity, for example, in the Prevention of Renal and Vascular Endstage Disease (PREVEND) study, a high LCAT activity independently predicted an increased risk of cardiovascular events. Despite all these results, a human recombinant LCAT (rLCAT) by AlphaCore Pharma, injected into LCAT-deficient mice was observed to increase HDL-C to near normal levels for several days. Also, the intravenous infusion of human rLCAT in rabbits was found to increase HDL-C, increase fecal secretion of cholesterol, and reduce atherosclerosis. Phase 1 trial results for ETC-642 (RLT Peptide) by Esperion Therapeutics revealed a rapid dose-related cholesterol mobilisation, as well as evidence of increases in HDL-cholesterol levels.
Endocannabinoid Receptor Blockers
Cannabis is a recreational drug which has been in existence for over 4,500 years. Although the plant contains various other cannabinoids, its main active substance is tetrahydrocannabinol (THC) which has been used for the management of post-chemotherapy emesis as well as HIV-associated anorexia. The endocannabinoids exerts their pharmacological actions by binding to G protein coupled receptors - CB1 that is present in the brain, autonomic nervous system, liver, muscle, gastrointestinal tract, and adipose tissue; CB2 are primarily in the lymphoid tissue and peripheral macrophages. Activation of CB1 receptors in the brain diminishes satiety and causes lipogenesis and production of adiponectin in the adipose tissue, which promotes insulin sensitivity. Rimonobant (SR141716), manufactured by Sanofi Aventis, is the first selective CB1 receptor blocker to be approved for appetite suppression and for treating obesity. According to The Rimonabant in Obesity-Lipids (RIO-Lipids) study which evaluated the lipid effects of rimonabant in 1036 overweight or obese patients with untreated dyslipidemia, there was a 23% increase in HDL-C levels, 15% decrease in triglyceride levels, and a 57.7% increase in adiponectin levels observed in the high-dosed group. However, adverse psychiatric and neurological effects (e.g., depression or anxiety) were reported which prevented its approval by the FDA in the United States as a weight control medication. These positive effects have also been demonstrated in other trials - The RIO-Europe Trial, RIO-North America, as well as its beneficial effect on smoking cessation.
The goal of ApoA-1 ppregulators is to up-regulate the endogenous synthesis of the major protein on HDL particles and apoA-1.
RVX-208 a.k.a RVX000222, manufactured by Resverlogix Corp, is a small synthetic molecule belonging to the quinazoline family (anti-malarial). Oral administration of RVX-208 increased plasma levels of both apoA-I and HDL-C up to 60% and 97% respectively, in a dose-dependent manner and promotes cholesterol efflux in african green monkeys. These effects have also been demonstrated in human subjects according to the ASSERT Study (phase 2a study). Currently, two phase 2b trials have just been completed where RVX-208's lipid efficacy, safety, and tolerability (SUSTAIN Study) and its effect on plaque burden (ASSURE Study) were independently assessed. The results from these trials are still pending.
Synthetic Liver X Receptor (LXR) Agonists
Liver X receptors (LXRs), a member of the nuclear receptor super-family, have an important role in lipid metabolism. There are two isoforms: LXRα and LXRβ. LXRα is present in the liver, macrophages, intestine, kidney, and adipose tissue, while LXRβ is ubiquitously distributed. The activation of LXRs has been demonstrated to induce intracellular cholesterol mobilization, increase cholesterol efflux from macrophages via ABCA1 and ABCG1, and increase intestinal HDL production. Unfortunately, further development of these agents has been halted due to the occurrence of hepatic steatosis and increased plasma triglyceride concentration in the liver. However, solutions to these limitations have been identified:
- Selective activation of LXRβ: Activation of LXRα has been linked to the development of fatty liver and increase in triglyceride levels. Therefore, selective LXRβ agonist might increase reverse cholesterol transport without inducing either hypertriglyceridemia or fatty liver.
- Selective activation of intestinal LXRs: Activation of hepatic LXRs promotes lipogenesis and elevation of triglyceride levels by the upregulation of SREBP1c. An intestine-specific LXRα/β agonist, GW6340, induces macrophage-specific reverse cholesterol transport and increases intestinal HDL production.
Other LXR agonists include:
|T091317||Widely used in LXR research to decrease atherosclerosis in mice by inducing NCP1 and NCP2 genes in macrophages|
|LXR-623||Increases ABCA1 and ABCG1 expression in cells|
Has central nervous system adverse effects Reduces plaque progression in combination with statins.
|GW6340||Intestine-specific LXRα/β agonist, induces cholesterol efflux and increases intestinal excretion of HDL-derived cholesterol|
|AT1-111||New agent |
Inhibits atherosclerosis and plaque formation in mice More potent than T091317
|SR9238||Newest agent |
Inhibits hepatic steatosis in the treatment of non-alcoholic fatty liver
Synthetic FXR Agonists
Farnesoid X receptor is a metabolic nuclear receptor activated by bile acids, and plays an important role in cholesterol metabolism. Its activation leads to both pro- and anti-atherosclerosis. Although FXR was demonstrated to reduce plasma HDL in earlier studies, it has been demonstrated that FXR agonists promote HDL-derived cholesterol excretion into feces in mice and monkeys. This has prompted growing interests in this field. Examples of FXR agonists include GW4064, 6-ECDCA, FXR-450, and PX20606.
Although previous attempt of gene therapy had little success in the past, there is new evidence that gene therapy may be a potential target in combating cardiovascular and metabolic disorders. Evidence for the potential role of gene therapy includes:
- Human ApoA-1 transgene experiments yielded a two-fold elevation in HDL cholesterol and inhibited progression of atherosclerosis in animals.
- Alipogene tiparvovec (AAV1-LPLS447X) therapy in 20 patients with lipoprotein lipase deficiency and recurrent pancreatitis yielded a 40% reduction in the serum triglyceride levels in half the patients between 3 and 12 weeks. Unfortunately, serum HDL cholesterol was not measured in these patients.
- Injection of an anti-miR-33 oligonucleotide in mice demonstrated an increase in ABCA1 mRNA expression and HDL levels proving that HDL cholesterol can be increased by increasing ABCA1 and ABCG1 expression through the microRNA.
All these evidences emphasize the genetic basis for the development of cardiovascular and metabolic disorders, and also explains the importance of gene therapy or somatic gene transfer as a potential therapeutic target.
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