|, proprotein convertase subtilisin/kexin type 9, FH3, HCHOLA3, LDLCQ1, NARC-1, NARC1, PC9|
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Proprotein convertase subtilisin/kexin type 9 (PCSK9) is an enzyme encoded by the PCSK9 gene in humans on chromosome 1. It is ubiquitously expressed in many tissues and cell types. PCSK9 binds to the receptor for low-density lipoprotein (LDL) cholesterol (LDL-C). In the liver, the LDL receptor (LDLR) removes LDL-C from the blood. When PCSK9 binds to the LDLR, the receptor is broken down and can no longer remove LDL-C from the blood. If PCSK9 is blocked, more LDLRs will be present on the surface of the liver and will remove more LDL-C from the blood. Therefore, blocking PCSK9 can lower blood cholesterol levels. Similar genes (orthologs) are found across many species. PCSK9 is inactive when first synthesized, because a section of peptide chains blocks their activity; proprotein convertases remove that section to activate the enzyme.
PCSK9 has medical importance because it acts in cholesterol homeostasis. Drugs can block PCSK9, thus lowering LDL-C. The first two PCSK9 inhibitors, alirocumab and evolocumab, were approved by the U.S. Food and Drug Administration in 2015 for lowering cholesterol where statins and other drugs were not enough. The manufacturers did not submit data to show that the drugs actually improved outcomes of cardiovascular disease, but they assumed that lowering cholesterol would treat cardiovascular disease. The cost of these new medications as of 2015 make them not cost effective.
The solved structure of PCSK9 reveals four major components in the pre-processed protein: the signal peptide (residues 1-30); the N-terminal prodomain (residues 31-152); the catalytic domain (residues 153-425); and the C-terminal domain (residues 426-692), which is further divided into three modules. The N-terminal prodomain has a flexible crystal structure and is responsible for regulating PCSK9 function by interacting with and blocking the catalytic domain, which otherwise binds the epidermal growth factor-like repeat A (EGF-A) domain of the LDLR. While previous studies indicated that the C-terminal domain was uninvolved in binding LDLR, a recent study by Du et al. demonstrated that the C-terminal domain does bind LDLR. The secretion of PCSK9 is largely dependent on the autocleavage of the signal peptide and N-terminal prodomain, though the N-terminal prodomain retains its association with the catalytic domain. In particular, residues 61-70 in the N-terminal prodomain are crucial for its autoprocessing.
This protein plays a major regulatory role in cholesterol homeostasis. PCSK9 binds to the EGF-A domain of the LDLR, inducing LDLR degradation. Reduced LDLR levels result in decreased metabolism of LDL-C, which could lead to hypercholesterolemia. PCSK9 may also have a role in the differentiation of cortical neurons.
PCSK9 is synthesized as a soluble zymogen that undergoes autocatalytic intramolecular processing in the endoplasmic reticulum. The protein may function as a proprotein convertase. PCSK9 is expressed mainly in the liver, the intestine, the kidney, and the central nervous system. This protein plays a major regulatory role in cholesterol homeostasis. PCSK9 binds to the EGF-A domain of the LDLR, inducing LDLR degradation. Reduced LDLR levels result in decreased metabolism of LDL cholesterol, which could lead to hypercholesterolemia. PCSK9 also plays an important role in intestinal triglyceride-rich apoB lipoprotein production in small intestine and postprandial lipemia.
After being processed in the ER, PCSK9 co-localizes with the protein sortilin on its way through the Golgi and trans-Golgi complex. A PCSK9-sortilin interaction is proposed to be required for cellular secretion of PCSK9. In healthy humans, plasma PCSK9 levels directly correlate with plasma sortilin levels, following a diurnal rhythm similar to cholesterol synthesis. Interestingly, the plasma PCSK9 concentration is higher in women compared to men, and the PCSK9 concentrations decrease with age in men but increasein women, suggesting that estrogen level most likely plays a role. PCSK9 gene expression can be regulated by sterol-response element binding proteins (SREBP-1/2), which also controls LDLR expression.
Variants of PCSK9 can reduce or increase circulating cholesterol. LDL-C is removed from the blood when it binds to an LDLR on the surface of liver cells, and is taken inside the cells. When PCSK9 binds to an LDLR, the receptor is destroyed along with the LDL particle. PCSK9 degrades LDLR by preventing the hairpin conformational change of LDLR. If PCSK9 does not bind, the receptor will return to the surface of the cell and can continue to remove free cholesterol from the bloodstream.
Other variants are associated with a rare autosomal dominant familial hypercholesterolemia (HCHOLA3). The mutations increase its protease activity, reducing LDLR levels and preventing the uptake of cholesterol into the cells.
In humans, PCSK9 was initially discovered as a protein expressed in the brain. However, it has also been described in the kidney, the pancreas, liver and small intestine. Recent evidence indicate that PCSK9 is highly expressed in arterial walls such as endothelium, smooth muscle cells, and macrophages, with a local effect that can regulate vascular homeostasis and atherosclerosis. Accordingly, it is now very clear that PCSK9 has pro-atherosclerotic effects and regulates lipoprotein synthesis.
As PCSK9 binds to LDLR, which prevents the removal of LDL cholesterol from the blood, several studies have determined the potential use of PCSK9 inhibitors in the treatment of hypercholesterolemia. Furthermore, loss-of-function mutations in the PCSK9 gene result in lower levels of LDL and protection against cardiovascular disease.
In addition to its lipoprotein synthetic and pro-atherosclerotic effects, PCSK9 is involved in glucose metabolism and obesity, regulation of re-absorption of sodium in the kidney which is relevant in hypertension. Furthermore, PCSK9 may be involved in bacterial or viral infections and sepsis. In the brain the role of PCSK9 is still controversial and may be either pro-apoptotic or protective in the development of the nervous system. PCSK9 levels have been detected in the cerebrospinal fluid at a 50-60 times lower level than in serum.
In February 2003, Nabil Seidah, a scientist at the Clinical Research Institute of Montreal in Canada, discovered a novel human proprotein convertase, the gene for which was located on the short arm of chromosome 1. Meanwhile, a lab led by Catherine Boileau at the Necker-Enfants Malades Hospital in Paris had been following families with familial hypercholesterolaemia, a genetic condition that, in 90% of cases causes coronary artery disease (FRAMINGHAM study) and in 60% of cases may lead to an early death; they had identified a mutation on chromosome 1 carried by some of these families, but had been unable to identify the relevant gene. The labs got together and by the end of the year published their work, linking mutations in the gene, now identified as PCSK9, to the condition. In their paper, they speculated that the mutations might make the gene overactive. In that same year, investigators at Rockefeller University and University of Texas Southwestern had discovered the same protein in mice, and had worked out the novel pathway that regulates LDL cholesterol in which PCSK9 is involved, and it soon became clear that the mutations identified in France led to excessive PCSK9 activity, and thus excessive removal of the LDL receptor, leaving people carrying the mutations with too much LDL cholesterol. Meanwhile, Dr. Helen H. Hobbs and Dr. Jonathan Cohen at UT-Southwestern had been studying people with very high and very low cholesterol, and had been collecting DNA samples. With the new knowledge about the role of PCSK9 and its location in the genome, they sequenced the relevant region of chromosome 1 in people with very low cholesterol and they found nonsense mutations in the gene, thus validating PCSK9 as a biological target for drug discovery. In July 2015, the FDA approved the new treatment.
A multi-locus genetic risk score study based on a combination of 27 loci including the PCSK9 gene, identified individuals at increased risk for both incident and recurrent coronary artery disease events, as well as an enhanced clinical benefit from statin therapy. The study was based on a community cohort study (the Malmo Diet and Cancer study) and four additional randomized controlled trials of primary prevention cohorts (JUPITER and ASCOT) and secondary prevention cohorts (CARE and PROVE IT-TIMI 22).
As a drug target
Drugs can inhibit PCSK9, leading to lowered circulating cholesterol. Since LDL is considered a risk factor for cardiovascular disease like heart attacks, it is plausible that these drugs may also reduce the risk of such diseases. Clinical studies, including phase III clinical trials, are now underway to describe the effect of PCSK9 inhibition on cardiovascular disease, and the safety and efficacy profile of the drugs. Among those inhibitors under development in December 2013 were the antibodies alirocumab, evolocumab, 1D05-IgG2 (Merck), RG-7652 and LY3015014, as well as the RNAi therapeutic ALN-PCS02. PCSK9 inhibitors are promising therapeutics for the treatment of people who exhibit statin intolerance, or as a way to bypass frequent dosage of statins for higher LDL concentration reduction.
An FDA warning in March 2014 about possible cognitive adverse effects of PCSK9 inhibition caused concern, as the FDA asked companies to include neurocognitive testing into their Phase III clinical trials.
A review published in 2015 concluded that these agents when used in patients with high cholesterol at risk for cardiovascular disease, seem to be safe and effective at reducing all-cause mortality, cardiovascular mortality, and heart attacks.
A number of monoclonal antibodies that bind to and inhibit PCSK9 near the catalytic domain were in clinical trials as of 2014. These include evolocumab (Amgen), bococizumab (Pfizer), and alirocumab (Aventis/Regeneron). As of July 2015, the EU approved these drugs including Evolocumab/Amgen according to Medscape news agency report. A meta-analysis of 24 clinical trials has shown that monoclonal antibodies against PCSK9 can reduce cholesterol, cardiac events and all-cause mortality.
A possible side effect of the monoclonal antibody might be irritation at the injection site. Before the infusions, participants received oral corticosteroids, histamine receptor blockers, and acetaminophen to reduce the risk of infusion-related reactions, which by themselves will cause several side effects.
Peptides that mimick the EGFA domain of the LDLR that binds to PCSK9 have been developed to inhibit PCSK9.
The PCSK9 antisense oligonucleotide increases expression of the LDLR and decreases circulating total cholesterol levels in mice. A locked nucleic acid reduced PCSK9 mRNA levels in mice. Initial clinical trials showed positive results of ALN-PCS, which acts by means of RNA interference.
A vaccine that targets PCSK9 has been developed to treat high cholesterol. The vaccine uses a VLP (virus-like particle) as an immunogenic carrier of an antigenic PCSK9 peptide. VLP’s are viruses that have had their DNA removed so that they retain their external structure for antigen display but are unable to replicate; they can induce an immune response without causing infection. Mice and macaques vaccinated with bacteriophage VLPs displaying PCSK9-derived peptides developed high-titer IgG antibodies that bound to circulating PCSK9. Vaccination was associated with significant reductions in total cholesterol, free cholesterol, phospholipids, and triglycerides.
Naturally occurring inhibitors
The plant alkaloid berberine inhibits the transcription of the PCSK9 gene in immortalized human hepatocytes in vitro, and lowers serum PCSK9 in mice and hamsters in vivo. It has been speculated that this action contributes to the ability of berberine to lower serum cholesterol. Annexin A2, an endogenous protein, is a natural inhibitor of PCSK9 activity.
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