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Pronunciation | /ˌmaɪkoʊfɪˈnɒlɪk/ |
Trade names | Cellcept, Myfortic, Myhibbin, others |
Other names | MPA, Mycophenolate sodium, Mycophenolate mofetil (AAN AU), Mycophenolate mofetil (USAN US) |
AHFS/Drugs.com | Monograph |
MedlinePlus | a601081 |
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Routes of administration | By mouth, intravenous [2] |
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Pharmacokinetic data | |
Bioavailability | 72% (sodium), 94% (mofetil) [11] |
Protein binding | 82–97% [11] |
Metabolism | Liver [11] |
Elimination half-life | 17.9±6.5 hours [11] |
Excretion | Urine (93%), faeces (6%) [11] |
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ECHA InfoCard | 100.041.912 |
Chemical and physical data | |
Formula | C17H20O6 |
Molar mass | 320.341 g·mol−1 |
3D model (JSmol) | |
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Mycophenolic acid is an immunosuppressant medication used to prevent rejection following organ transplantation and to treat autoimmune conditions such as Crohn's disease and lupus. [12] [13] Specifically it is used following kidney, heart, and liver transplantation. [13] It can be given by mouth or by injection into a vein. [13] It comes as mycophenolate sodium and mycophenolate mofetil. [13]
Common side effects include nausea, infections, and diarrhea. [13] Other serious side effects include an increased risk of cancer, progressive multifocal leukoencephalopathy, anemia, and gastrointestinal bleeding. [13] Use during pregnancy may harm the baby. [13] It works by blocking inosine monophosphate dehydrogenase (IMPDH), which is needed by lymphocytes to make guanosine. [13]
Mycophenolic acid was initially discovered by Italian Bartolomeo Gosio in 1893. [14] [15] It was rediscovered in 1945 and 1968. [15] It was approved for medical use in the United States in 1995 following the discovery of its immunosuppressive properties in the 1990s. [13] [14] It is available as a generic medication. [16] In 2020, it was the 313th most commonly prescribed medication in the United States, with more than 900 thousand prescriptions. [17]
Mycophenolate is used for the prevention of organ transplant rejection. Mycophenolate mofetil is indicated for the prevention of organ transplant rejection in adults and kidney transplantation rejection in children over 2 years; whereas mycophenolate sodium is indicated for the prevention of kidney transplant rejection in adults. Mycophenolate sodium has also been used for the prevention of rejection in liver, heart, or lung transplants in children older than two years. [18]
Mycophenolate is increasingly utilized as a steroid sparing treatment in autoimmune diseases and similar immune-mediated disorders including Behçet's disease, pemphigus vulgaris, immunoglobulin A nephropathy, small vessel vasculitides, and psoriasis. [19] It is also used for retroperitoneal fibrosis along with a number of other medications. [20] Specifically it has also be used for psoriasis not treatable by other methods. [21]
Its increasing application in treating lupus nephritis has demonstrated more frequent complete response and less frequent complications [19] compared to cyclophosphamide bolus therapy, a regimen with risk of bone marrow suppression, infertility, and malignancy. [12] Further work addressing maintenance therapy demonstrated mycophenolate superior to cyclophosphamide, again in terms of response and side-effects. [12] [22] Walsh proposed that mycophenolate should be considered as a first-line induction therapy for treatment of lupus nephritis in people without kidney dysfunction. [23]
Compared with azathioprine it has higher incidence of diarrhea, and no difference in risk of any of the other side effects in transplant patients. [24] Mycophenolic acid is 15 times more expensive than azathioprine. [25]
Common adverse drug reactions (≥ 1% of people) include diarrhea, nausea, vomiting, joint pain; infections, leukopenia, or anemia reflect the immunosuppressive and myelosuppressive nature of the drug. Mycophenolate sodium is also commonly associated with fatigue, headache, cough and/or breathing issues. Intravenous (IV) administration of mycophenolate mofetil is also commonly associated with thrombophlebitis and thrombosis. Infrequent adverse effects (0.1–1% of people) include esophagitis, gastritis, gastrointestinal tract hemorrhage, and/or invasive cytomegalovirus (CMV) infection. [18] More rarely, pulmonary fibrosis or various neoplasia occur: melanoma, lymphoma, other malignancies having an occurrences of 1 in 20 to 1 in 200, depending on the type, with neoplasia in the skin being the most common site. [26] [27] [ not specific enough to verify ] Several cases of pure red cell aplasia (PRCA) have also been reported. [28]
The U.S. Food and Drug Administration (FDA) issued an alert that people are at increased risk of opportunistic infections, such as activation of latent viral infections, including shingles, other herpes infections, cytomegalovirus, and BK virus associated nephropathy. In addition the FDA is investigating[ when? ] 16 people that developed a rare neurological disease while taking the drug. This is a viral infection known as progressive multifocal leukoencephalopathy; it attacks the brain and is usually fatal. [29]
Mycophenolic acid is associated with miscarriage and congenital malformations when used during pregnancy, and should be avoided whenever possible by women trying to get pregnant. [30] [31]
Among the most common effects of this drug is increased blood cholesterol levels. Other changes in blood chemistry such as hypomagnesemia, hypocalcemia, hyperkalemia, and an increase in blood urea nitrogen (BUN) can occur. [2] [32]
Purines (including the nucleosides guanosine and adenosine) can either be synthesized de novo using ribose 5-phosphate or they can be salvaged from free nucleotides. Mycophenolic acid is a potent, reversible, non-competitive inhibitor of inosine-5′-monophosphate dehydrogenase (IMPDH), an enzyme essential to the de novo synthesis of guanosine-5'-monophosphate (GMP) from inosine-5'-monophosphate (IMP). [33] IMPDH inhibition particularly affects lymphocytes since they rely almost exclusively on de novo purine synthesis. [34] In contrast, many other cell types use both pathways, and some cells, such as terminally differentiated neurons, depend completely on purine nucleotide salvage. [35] Thus, use of mycophenolic acid leads to a relatively selective inhibition of DNA replication in T cells and B cells.
Mycophenolate can be derived from the fungi Penicillium stoloniferum , P. brevicompactum and P. echinulatum . [36] Mycophenolate mofetil is metabolised in the liver to the active moiety mycophenolic acid. It reversibly inhibits inosine monophosphate dehydrogenase, [37] the enzyme that controls the rate of synthesis of guanine monophosphate in the de novo pathway of purine synthesis used in the proliferation of B and T lymphocytes. [38] Other cells recover purines via a separate salvage pathway and are thus able to escape the effect. [2]
Mycophenolate is potent and can, in many contexts, be used in place of the older anti-proliferative azathioprine. [39] It is usually used as part of a three-compound regimen of immunosuppressants, also including a calcineurin inhibitor (ciclosporin or tacrolimus) and a glucocorticoid (e.g. dexamethasone or prednisone). [40]
Mycophenolate mofetil is the morpholino ethyl ester of mycophenolic acid; the ester masks the carboxyl group. [41] Mycophenolate mofetil is reported to have a pKa values of 5.6 for the morpholino moiety and 8.5 for the phenolic group.
Mycophenolic acid was discovered by Italian medical scientist Bartolomeo Gosio. Gosio collected a fungus from spoiled corn and named it Penicillium glaucum. (The species is now called P. brevicompactum .[ citation needed ]) In 1893 he found that the fungus had antibacterial activity. In 1896 he isolated crystals of the compound, which he successfully demonstrated as the active antibacterial compound against the anthrax bacterium. [21] This was the first antibiotic that was isolated in pure and crystalline form. But the discovery was forgotten. [42] It was rediscovered by two American scientists C.L. Alsberg and O.M. Black in 1912, and given the name mycophenolic acid. The compound was eventually demonstrated to have antiviral, antifungal, antibacterial, anticancer, and antipsoriasis activities. [43] Although it is not commercialised as antibiotic due to its adverse effects, its modified compound (ester derivative) is an approved immunosuppressant drug in kidney, heart, and liver transplantations, and is marketed under the brands CellCept (mycophenolate mofetil by Roche) and Myfortic (mycophenolate sodium by Novartis). [44]
Cellcept was developed by a South African geneticist Anthony Allison and his wife Elsie M. Eugui. In the 1970s while working at the Medical Research Council, Allison investigated the biochemical causes of immune deficiency in children. He discovered the metabolic pathway involving an enzyme, inosine monophosphate dehydrogenase, which is responsible for undesirable immune response in autoimmune diseases, as well as for immune rejection in organ transplantation. He conceived an idea that if a molecule that could block the enzyme is discovered, then, it would become an immunosuppressive drug that could be used for autoimmune diseases and in organ transplantation. In 1981 he decided to go for drug discovery and approached several pharmaceutical companies, which turned him down one by one as he had no primary knowledge of drug research. However, Syntex liked his plans and asked him to join the company with his wife. [45] He became vice president for the research. In one of their experiments the Allisons used an antibacterial compound, mycophenolate mofetil, which was abandoned in clinical use due to its adverse effects. They discovered that the compound had immunosuppressive activity. [46] [47] They synthesised a chemical variant for increased activity and reduced adverse effects. [48] [49] [50] [51] [52] They subsequently demonstrated that it was useful in organ transplantation in experimental rats. [53] [54] After successful clinical trials, [55] the compound was approved for use in kidney transplant by the U.S. Food and Drug Administration on 3 May 1995, [56] and was sold under the brand name CellCept. [57] [58] It was approved for use in the European Union in February 1996. [10]
It was initially introduced as the prodrug mycophenolate mofetil (MMF, trade name CellCept) to improve oral bioavailability. The salt mycophenolate sodium has also been introduced. Enteric-coated mycophenolate sodium (EC-MPS) is an alternative MPA formulation.
MMF and EC-MPS appear to be equal in benefits and safety. [59]
Mycophenolate mofetil is beginning to be used in the management of auto-immune disorders such as idiopathic thrombocytopenic purpura (ITP), systemic lupus erythematosus (SLE), scleroderma (systemic sclerosis or SSc), and pemphigus vulgaris (PV) with success for some patients. [60]
It is also being used as a long-term therapy for maintaining remission of granulomatosis with polyangiitis, though thus far, studies have found it inferior to azathioprine.[ citation needed ] A combination of mycophenolate and ribavirin has been found to stop infection by and replication of dengue virus in vitro . [61] [62] It has also shown promising antiviral activity against MERS, especially in combination with interferon. [63]
Preliminary data suggest that mycophenolate mofetil might have benefits in people with multiple sclerosis. However the evidence is insufficient to determine the effects as an add‐on therapy for interferon beta-1a in people with RRMS. [64]
Tacrolimus, sold under the brand name Prograf among others, is an immunosuppressive drug. After allogenic organ transplant, the risk of organ rejection is moderate. To lower the risk of organ rejection, tacrolimus is given. The drug can also be sold as a topical medication in the treatment of T-cell-mediated diseases such as eczema and psoriasis. For example, it is prescribed for severe refractory uveitis after a bone marrow transplant, exacerbations of minimal change disease, Kimura's disease, and vitiligo. It can be used to treat dry eye syndrome in cats and dogs.
Immunosuppression is a reduction of the activation or efficacy of the immune system. Some portions of the immune system itself have immunosuppressive effects on other parts of the immune system, and immunosuppression may occur as an adverse reaction to treatment of other conditions.
Immunosuppressive drugs, also known as immunosuppressive agents, immunosuppressants and antirejection medications, are drugs that inhibit or prevent the activity of the immune system.
A pancreas transplant is an organ transplant that involves implanting a healthy pancreas into a person who usually has diabetes.
Azathioprine, sold under the brand name Imuran, among others, is an immunosuppressive medication. It is used for the treatment of rheumatoid arthritis, granulomatosis with polyangiitis, Crohn's disease, ulcerative colitis, and systemic lupus erythematosus; and in kidney transplants to prevent rejection. It is listed by the International Agency for Research on Cancer as a group 1 human carcinogen. It is taken by mouth or injected into a vein.
Basiliximab, sold under the brand name Simulect, is a monoclonal antibody used to prevent rejection in kidney transplants. It is a chimeric mouse-human monoclonal antibody to the α chain (CD25) of the IL-2 receptor of T cells. It is used in combination with other medicines used to prevent organ rejection.
Leukopenia is a decrease in the number of leukocytes (WBC). Found in the blood, they are the white blood cells, and are the body's primary defense against an infection. Thus the condition of leukopenia places individuals at increased risk of infection.
Lupus nephritis is an inflammation of the kidneys caused by systemic lupus erythematosus (SLE), an autoimmune disease. It is a type of glomerulonephritis in which the glomeruli become inflamed. Since it is a result of SLE, this type of glomerulonephritis is said to be secondary, and has a different pattern and outcome from conditions with a primary cause originating in the kidney. The diagnosis of lupus nephritis depends on blood tests, urinalysis, X-rays, ultrasound scans of the kidneys, and a kidney biopsy. On urinalysis, a nephritic picture is found and red blood cell casts, red blood cells and proteinuria is found.
Cyclophosphamide (CP), also known as cytophosphane among other names, is a medication used as chemotherapy and to suppress the immune system. As chemotherapy it is used to treat lymphoma, multiple myeloma, leukemia, ovarian cancer, breast cancer, small cell lung cancer, neuroblastoma, and sarcoma. As an immune suppressor it is used in nephrotic syndrome, granulomatosis with polyangiitis, and following organ transplant, among other conditions. It is taken by mouth or injection into a vein.
The BK virus, also known as Human polyomavirus 1, is a member of the polyomavirus family. Past infection with the BK virus is widespread, but significant consequences of infection are uncommon, with the exception of the immunocompromised and the immunosuppressed. BK virus is an abbreviation of the name of the first patient, from whom the virus was isolated in 1971.
Synergistic enhancers of antiretrovirals usually do not possess any antiretroviral properties alone, but when they are taken concurrently with antiretroviral drugs they enhance the effect of that drug.
Purine metabolism refers to the metabolic pathways to synthesize and break down purines that are present in many organisms.
Inosine triphosphate pyrophosphatase is an enzyme that in humans is encoded by the ITPA gene, by the rdgB gene in bacteria E.coli and the HAM1 gene in yeast S. cerevisiae; the protein is also encoded by some RNA viruses of the Potyviridae family. Two transcript variants encoding two different isoforms have been found for this gene. Also, at least two other transcript variants have been identified which are probably regulatory rather than protein-coding.
Mizoribine is an immunosuppressive drug. The compound was first observed in Tokyo, Japan, in 1971. First isolated from the fungus Penicillium brefeldianum. Mizoribine (MZB) is an imidazole nucleoside that has been used in renal transplantation, and in steroid-resistant nephrotic syndrome, IgA nephropathy, lupus, as well as for adults with rheumatoid arthritis, lupus nephritis and other rheumatic diseases. MZB exerts its activity through selective inhibition of inosine monophosphate dehydrogenase and guanosine monophosphate synthetase, resulting in the complete inhibition of guanine nucleotide synthesis without incorporation into nucleotides. It arrests DNA synthesis in the S phase of cellular division. Thus, MZB has less toxicity than azathioprine, another immunosuppressant used for some of the same diseases.
Diffuse proliferative glomerulonephritis (DPGN) is a type of glomerulonephritis that is the most serious form of renal lesions in SLE and is also the most common, occurring in 35% to 60% of patients. In absence of SLE, DPGN pathology looks more like Membranoproliferative glomerulonephritis
Inosine-5'-monophosphate dehydrogenase 2, also known as IMP dehydrogenase 2, is an enzyme that in humans is encoded by the IMPDH2 gene.
Voclosporin, sold under the brand name Lupkynis, is a calcineurin inhibitor used as an immunosuppressant medication for the treatment of lupus nephritis. It is an analog of ciclosporin that has enhanced action against calcineurin and greater metabolic stability.
The enzyme mycophenolic acid acyl-glucuronide esterase (EC 3.1.1.93, mycophenolic acid acyl-glucuronide deglucuronidase; AcMPAG deglucuronidase; systematic name mycophenolic acid O-acyl-glucuronide-ester hydrolase), is in humans encoded by the ABHD10 gene, and catalyses the reaction
Anthony Clifford Allison was a South African geneticist and medical scientist who made pioneering studies on the genetic resistance to malaria. Allison undertook his primary schooling in Kenya, completed his higher education in South Africa, and obtained a BSc in medical science from the University of the Witwatersrand in 1947. He earned his PhD and medical qualification from the University of Oxford in 1950. After working at the Radcliffe Infirmary for two years, he worked as post-doctoral student to Linus Pauling in 1954. After teaching medicine for three years at Oxford, he worked at the Medical Research Council in London. In 1978 he simultaneously worked at the International Laboratory for Research on Animal Diseases (ILRAD) as its director, and at the World Health Organization's (WHO) Immunology Laboratory, both in Nairobi. He later became the Vice President for Research at Syntex Corporation (1981-1994).
Bartolomeo Gosio was an Italian medical scientist. He discovered a toxic fume, eponymously named "Gosio gas", which is produced by microorganisms, that killed many people. He identified the chemical nature of the gas as an arsenic compound (arsine), but incorrectly named it as diethylarsine. He also discovered an antibacterial compound called mycophenolic acid from the mould Penicillium brevicompactum. He demonstrated that the novel compound was effective against the deadly anthrax bacterium, Bacillus anthracis. This was the first antibiotic compound isolated in pure and crystallised form. Though the original compound was abandoned in clinical practice due to its adverse effects, its chemical derivative mycophenolate mofetil became the drug of choice as an immunosuppressant in kidney, heart, and liver transplantations.