Colchicine
Colchicine is a medication used to treat gout and Behçet's disease. In gout, it is less preferred to NSAIDs or steroids. Other uses include the prevention of pericarditis and familial Mediterranean fever. It is taken by mouth.
Common side effects include gastrointestinal upset, particularly at high doses. Severe side effects may include low blood cells and rhabdomyolysis. Safety of use during pregnancy is unclear while use during breastfeeding appears safe. Excessive doses may result in death. Colchicine works by decreasing inflammation via multiple mechanisms.
Colchicine, in the form of the autumn crocus, has been used as early as 1500 BC to treat joint swelling. It was approved for medical use in the United States in 1961. It is available as a generic medication in the United Kingdom. In 2017, it was the 201st most commonly prescribed medication in the United States, with more than two million prescriptions.
Medical uses
Gout
Colchicine is an alternative for those unable to tolerate NSAIDs in gout. At high doses, side effects limit its use. At lower doses, it is well tolerated. One review found low-quality evidence that low-dose colchicine reduced gout symptoms and pain, whereas high-dose colchicine was effective against pain, but caused more severe side effects, such as diarrhea, nausea or vomiting.For treating gout symptoms, colchicine is used orally with or without food, as symptoms first appear. Subsequent doses may be needed if symptoms worsen. There is preliminary evidence that daily colchicine was effective as a long-term prophylaxis when used with allopurinol to reduce the risk of increased uric acid levels and acute gout flares, although adverse gastrointestinal effects may occur.
Other conditions
Colchicine is also used as an anti-inflammatory agent for long-term treatment of Behçet's disease. It appears to have limited effect in relapsing polychondritis, as it may only be useful for the treatment of chondritis and mild skin symptoms. It is a component of therapy for several other conditions, including pericarditis, pulmonary fibrosis, biliary cirrhosis, various vasculitides, pseudogout, spondyloarthropathies, calcinosis, scleroderma, and amyloidosis. Research regarding the efficacy of colchicine in many of these diseases has not been performed.It is also used in the treatment of familial Mediterranean fever, in which it reduces attacks and the long-term risk of amyloidosis.
Colchicine is effective for prevention of atrial fibrillation after cardiac surgery.
Contraindications
Long-term regimens of oral colchicine are absolutely contraindicated in people with advanced kidney failure. About 10-20 percent of a colchicine dose is excreted unchanged by the kidneys; it is not removed by hemodialysis. Cumulative toxicity is a high probability in this clinical setting, and a severe neuromyopathy may result. The presentation includes a progressive onset of proximal weakness, elevated creatine kinase, and sensorimotor polyneuropathy. Colchicine toxicity can be potentiated by the concomitant use of cholesterol-lowering drugs.Adverse effects
Deaths - both accidental and intentional - have resulted from overdose of colchicine. Typical side effects of moderate doses may include gastrointestinal upset, diarrhea, and neutropenia. High doses can also damage bone marrow, lead to anemia, and cause hair loss. All of these side effects can result from inhibition of mitosis, which may include neuromuscular toxicity and rhabdomyolysis.Toxicity
According to one review, colchicine poisoning by overdose begins with a gastrointestinal phase occurring 10–24 hours after ingestion, followed by multiple organ dysfunction occurring 24 hours to 7 days after ingestion, after which the affected person either declines into multi-organ failure or recovers over several weeks.Colchicine can be toxic when ingested, inhaled, or absorbed in the eyes. Colchicine can cause a temporary clouding of the cornea and be absorbed into the body, causing systemic toxicity. Symptoms of colchicine overdose start 2 to 24 hours after the toxic dose has been ingested and include burning in the mouth and throat, fever, vomiting, diarrhea, and abdominal pain. This can cause hypovolemic shock due to extreme vascular damage and fluid loss through the gastrointestinal tract, which can be fatal.
If the affected person survives the gastrointestinal phase of toxicity, they may experience multiple organ failure and critical illness. This includes kidney damage, which causes low urine output and bloody urine; low white blood cell counts that can last for several days; anemia; muscular weakness; liver failure; hepatomegaly; bone marrow suppression; thrombocytopenia; and ascending paralysis leading to potentially fatal respiratory failure. Neurologic symptoms are also evident, including seizures, confusion, and delirium; children may experience hallucinations. Recovery may begin within six to eight days and begins with rebound leukocytosis and alopecia as organ functions return to normal.
Long-term exposure to colchicine can lead to toxicity, particularly of the bone marrow, kidney, and nerves. Effects of long-term colchicine toxicity include agranulocytosis, thrombocytopenia, low white blood cell counts, aplastic anemia, alopecia, rash, purpura, vesicular dermatitis, kidney damage, anuria, peripheral neuropathy, and myopathy.
No specific antidote for colchicine is known, but supportive care is used in cases of overdose. In the immediate period after an overdose, monitoring for gastrointestinal symptoms, cardiac dysrhythmias, and respiratory depression is appropriate, and may require gastrointestinal decontamination with activated charcoal or gastric lavage.
Mechanism of toxicity
With overdoses, colchicine becomes toxic as an extension of its cellular mechanism of action via binding to tubulin. Cells so affected undergo impaired protein assembly with reduced endocytosis, exocytosis, cellular motility, and interrupted function of heart cells, culminating in multi-organ failure.Epidemiology
In the United States, there are several hundred recorded cases of colchicine toxicity annually; approximately 10% of which end with serious morbidity or mortality. Many of these cases are intentional overdoses, but others were accidental; for example, if the drug was not dosed appropriately for kidney function. Most cases of colchicine toxicity occur in adults. Many of these adverse events resulted from the use of intravenous colchicine.Drug interactions
Colchicine interacts with the P-glycoprotein transporter, and the CYP3A4 enzyme involved in drug and toxin metabolism. Fatal drug interactions have occurred when colchicine was taken with other drugs that inhibit P-glycoprotein and CYP3A4, such as erythromycin or clarithromycin.People taking macrolide antibiotics, ketoconazole or cyclosporine, or those who have liver or kidney disease, should not take colchicine, as these drugs and conditions may interfere with colchicine metabolism and raise its blood levels, potentially increasing its toxicity abruptly. Symptoms of toxicity include gastrointestinal upset, fever, muscle pain, low blood cell counts, and organ failure. People with HIV/AIDS taking atazanavir, darunavir, fosamprenavir, indinavir, lopinavir, nelfinavir, ritonavir, or saquinavir may experience colchicine toxicity. Grapefruit juice and statins can also increase colchicine concentrations.
Mechanism of action
In gout, inflammation in joints results from the precipitation of circulating uric acid, exceeding its solubility in blood and depositing as crystals of monosodium urate in and around synovial fluid and soft tissues of joints. These crystal deposits cause inflammatory arthritis, which is initiated and sustained by mechanisms involving various proinflammatory mediators, such as cytokines. Colchicine accumulates in white blood cells and affects them in a variety of ways: decreasing motility, mobilization and adhesion.Under preliminary research are various mechanisms by which colchicine may interfere with gout inflammation:
- inhibits microtubule polymerization by binding to its constitutive protein, tubulin
- as availability of tubulin is essential to mitosis, colchicine may inhibit mitosis
- inhibits activation and migration of neutrophils to sites of inflammation
- interferes with the inflammasome complex found in neutrophils and monocytes that mediate interleukin-1β activation, a component of inflammation
- inhibits superoxide anion production in response to urate crystals
- interrupts mast cell and lysosome degranulation
- inhibits release of glycoproteins that promote chemotaxis from synovial cells and neutrophils
History
The plant source of colchicine, the autumn crocus, was described for treatment of rheumatism and swelling in the Ebers Papyrus, an Egyptian medical papyrus. It is a toxic alkaloid and secondary metabolite. Colchicum extract was first described as a treatment for gout in De Materia Medica by Pedanius Dioscorides, in the first century AD. Use of the bulb-like corms of Colchicum to treat gout probably dates to around 550 AD, as the "hermodactyl" recommended by Alexander of Tralles. Colchicum corms were used by the Persian physician Avicenna, and were recommended by Ambroise Paré in the 16th century, and appeared in the London Pharmacopoeia of 1618. Colchicum use waned over time, likely due to the severe gastrointestinal side effects preparations caused. In 1763, Colchicum was recorded as a remedy for dropsy among other illnesses. Colchicum plants were brought to North America by Benjamin Franklin, who had gout himself and had written humorous doggerel about the disease during his stint as United States Ambassador to France.Colchicine was first isolated in 1820 by the French chemists P. S. Pelletier and J. B.Caventou. In 1833, P. L. Geiger purified an active ingredient, which he named colchicine. It quickly became a popular remedy for gout. The determination of colchicine's structure required decades, although in 1945, Michael Dewar made an important contribution when he suggested that, among the molecule's three rings, two were seven-member rings. Its pain-relieving and anti-inflammatory effects for gout were linked to its ability to bind with tubulin.
United States ''Unapproved Drugs Initiative''
An unintended consequence of the 2006 U.S. Food and Drug Administration safety program called the Unapproved Drugs Initiative—through which the FDA sought more rigorous testing of efficacy and safety of colchicine and other unapproved drugs—was a price increase of 2000 percent for "a gout remedy so old that the ancient Greeks knew about its effects." Under Unapproved Drugs Initiative small companies like URL Pharma, a Philadelphia drugmaker, were rewarded with licenses for testing of medicines like colchicine. In 2009, the FDA reviewed a New Drug Application for colchicine submitted by URL Pharma. URL Pharma did the testing, gained FDA formal approval and was granted rights over colchicine. With this monopoly pricing power, the price of colchicine increased.In 2012 Asia's biggest drugmaker, Takeda Pharmaceutical Co., acquired URL Pharma for $800 million including the rights to colchicine earning $1.2 billion in revenue by raising the price even more.
Oral colchicine had been used for many years as an unapproved drug with no FDA-approved prescribing information, dosage recommendations, or drug interaction warnings. On July 30, 2009 the FDA approved colchicine as a monotherapy for the treatment of three different indications, and gave URL Pharma a three-year marketing exclusivity agreement in exchange for URL Pharma doing 17 new studies and investing $100 million into the product, of which $45 million went to the FDA for the application fee. URL Pharma raised the price from $0.09 per tablet to $4.85, and the FDA removed the older unapproved colchicine from the market in October 2010, both in oral and intravenous forms, but gave pharmacies the opportunity to buy up the older unapproved colchicine. Colchicine in combination with probenecid has been FDA-approved prior to 1982.
July 29, 2009, colchicine won FDA approval in the United States as a stand-alone drug for the treatment of acute flares of gout and familial Mediterranean fever. It had previously been approved as an ingredient in an FDA-approved combination product for gout. The approval was based on a study in which two doses an hour apart were as effective as higher doses in combating the acute flare of gout.
Marketing exclusivity in the United States
As a drug antedating the FDA, colchicine was sold in the United States for many years without having been reviewed by the FDA for safety and efficacy. The FDA reviewed approved colchicine for gout flares, awarding Colcrys a three-year term of market exclusivity, prohibiting generic sales, and increasing the price of the drug from $0.09 to $4.85 per tablet.Numerous consensus guidelines, and previous randomized controlled trials, had concluded that colchicine is effective for acute flares of gouty arthritis. However, as of 2006, the drug was not formally approved by the FDA, owing to the lack of a conclusive randomized control trial. Through the Unapproved Drugs Initiative, the FDA sought more rigorous testing of efficacy and safety of colchicine and other unapproved drugs. In exchange for paying for the costly testing, the FDA gave URL Pharma three years of market exclusivity for its Colcrys brand, under the Hatch-Waxman Act, based in part on URL-funded research in 2007, including pharmacokinetic studies and a randomized control trial with 185 patients with acute gout.
In April 2010, an editorial in the New England Journal of Medicine said that the rewards of this legislation are not calibrated to the quality or value of the information produced, that no evidence of meaningful improvement to public health was seen, and that it would be less expensive for the FDA, the National Institutes of Health or large insurers to pay for trials themselves. Furthermore, the cost burden of this subsidy falls primarily on patients or their insurers. In September 2010, the FDA ordered a halt to marketing unapproved single-ingredient oral colchicine.
Colchicine patents expire on February 10, 2029.
Orphan drug
URL Pharma also received seven years of market exclusivity for Colcrys in treatment of familial Mediterranean fever, under the Orphan Drug Law. URL Pharma then raised the price per tablet from $0.09 to $4.85 and sued to remove other versions from the market, increasing annual costs for the drug to U.S. state Medicaid programs from $1 million to $50 million. Medicare also paid significantly higher costs, making this a direct money-loser for the government.Regulation
It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act, and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.Formulations and dosing
s for colchicine are Colcrys or Mitigare which are manufactured as a dark- and light-blue capsule having a dose of 0.6 mg. Colchicine is also prepared as a white, yellow, or purple pill having a dose of 0.6 mg.Colchicine is typically prescribed to mitigate or prevent the onset of gout, or its continuing symptoms and pain, using a low-dose prescription of 0.6 to 1.2 mg per day, or a high-dose amount of up to 4.8 mg in the first 6 hours of a gout episode. With an oral dose of 0.6 mg, peak blood levels occur within one to two hours. For treating gout, the initial effects of colchicine occur in a window of 12 to 24 hours, with a peak within 48 to 72 hours. It has a narrow therapeutic window, requiring monitoring of the subject for potential toxicity. Colchicine is not a general pain relief drug, and is not used to treat pain in other disorders.
Biosynthesis
According to laboratory research, the biosynthesis of colchicine involves the amino acids phenylalanine and tyrosine as precursors. Giving radioactive phenylalanine-2-14C to C. byzantinum, another plant of the family Colchicaceae, resulted in its incorporation into colchicine. However, the tropolone ring of colchicine resulted from the expansion of the tyrosine ring. Radioactive feeding experiments of C. autumnale revealed that colchicine can be synthesized biosynthetically from -autumnaline. That biosynthesic pathway occurs primarily through a phenolic coupling reaction involving the intermediate isoandrocymbine. The resulting molecule undergoes O-methylation directed by S-adenosylmethionine. Two oxidation steps followed by the cleavage of the cyclopropane ring leads to the formation of the tropolone ring contained by N-formyldemecolcine. N-formyldemecolcine hydrolyzes then to generate the molecule demecolcine, which also goes through an oxidative demethylation that generates deacetylcolchicine. The molecule of colchicine appears finally after addition of acetyl-coenzyme A to deacetylcolchicine.Purification
Colchicine may be purified from Colchicum autumnale or Gloriosa superba. Concentrations of colchicine in C. autumnale peak in the summer, and range from 0.1% in the flower to 0.8% in the bulb and seeds.Botanical use
Colchicine is widely used in plant breeding by inducing polyploidy in plant cells to produce new or improved varieties, strains and cultivars. Since chromosome segregation is driven by microtubules, colchicine is used in plant cells during cellular division by inhibiting chromosome segregation during meiosis; half the resulting gametes, therefore, contain no chromosomes, while the other half contains double the usual number of chromosomes, and lead to embryos with double the usual number of chromosomes. While this would be fatal in most higher animal cells, in plant cells it is not only usually well tolerated, but also frequently results in larger, hardier, faster-growing, and in general more desirable plants than the normally diploid parents. For this reason, this type of genetic manipulation is frequently used in breeding plants commercially.When such a tetraploid plant is crossed with a diploid plant, the triploid offspring are usually sterile, although many triploids can be propagated vegetatively. Growers of annual triploid plants not readily propagated cannot produce a second-generation crop from the seeds of the triploid crop, and need to buy triploid seed from a supplier each year. Many sterile triploid plants, including some trees and shrubs, are becoming increasingly valued in horticulture and landscaping because they do not become invasive species. In certain species, colchicine-induced triploidy has been used to create "seedless" fruit, such as seedless watermelons. Since most triploids do not produce pollen themselves, such plants usually require cross-pollination with a diploid parent to induce fruit production.
The ability of colchicine to induce polyploidy can be also exploited to render infertile hybrids fertile, for example in breeding triticale from wheat and rye. Wheat is typically tetraploid and rye diploid, with their triploid hybrid infertile; treatment of triploid triticale with colchicine gives fertile hexaploid triticale. When used to induce polyploidy in plants, colchicine cream is usually applied to a growth point of the plant, such as an apical tip, shoot, or sucker. Also, seeds can be presoaked in a colchicine solution before planting.