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Trade names | Plicera |
Other names | Isofagomine; AT-2101, HGT-3410 |
Routes of administration | Oral |
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Formula | C6H13NO3 |
Molar mass | 147.174 g·mol−1 |
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Afegostat (INN; also known as isofagomine; planned trade name Plicera) was an experimental drug for the treatment of certain forms of Gaucher's disease that was being developed by Amicus Therapeutics and Shire plc until a failed clinical trial in 2009 led to termination of its development. The substance was used in form of the tartrate.
β-Glucocerebrosidase, an enzyme needed for the metabolisation of glucocerebroside, is misfolded in individuals with Gaucher's disease due to various mutations, one of which is called N370S. Afegostat, an iminosugar, binds selectively to N370S glucocerebrosidase and restores its correct conformation and, consequently, enhances its activity about threefold. [1] [2]
Afegostat was invented by Mikael Bols and Troels Skrydstrup and was first prepared by Jespersen and Bols. [3]
Amicus Therapeutics licensed patents related to afegostat from Mt. Sinai School of Medicine, University of Maryland, and Novo Nordisk A/S. They also signed a collaboration agreement with Shire plc related to this drug and others. [4] : 13
It was granted orphan drug status by the European Medicines Agency (EMA) [5] and by the US FDA. [4] : 10
When afegostat failed a Phase II clinical trial in 2009, Shire terminated the collaboration agreement and Amicus determined it would no longer develop the afegostat. [4] : 2, 10, 11 The first patents in Amicus' patent portfolio on afegostat expired in 2015. [4] : 12
Gaucher's disease or Gaucher disease (GD) is a genetic disorder in which glucocerebroside accumulates in cells and certain organs. The disorder is characterized by bruising, fatigue, anemia, low blood platelet count and enlargement of the liver and spleen, and is caused by a hereditary deficiency of the enzyme glucocerebrosidase, which acts on glucocerebroside. When the enzyme is defective, glucocerebroside accumulates, particularly in white blood cells and especially in macrophages. Glucocerebroside can collect in the spleen, liver, kidneys, lungs, brain, and bone marrow.
Fabry disease, also known as Anderson–Fabry disease, is a rare genetic disease that can affect many parts of the body, including the kidneys, heart, and skin. Fabry disease is one of a group of conditions known as lysosomal storage diseases. The genetic mutation that causes Fabry disease interferes with the function of an enzyme that processes biomolecules known as sphingolipids, leading to these substances building up in the walls of blood vessels and other organs. It is inherited in an X-linked manner.
Niemann–Pick disease is a group of severe inherited metabolic disorders, in which sphingomyelin accumulates in lysosomes in cells.
β-Glucocerebrosidase is an enzyme with glucosylceramidase activity that is needed to cleave, by hydrolysis, the beta-glycosidic linkage of the chemical glucocerebroside, an intermediate in glycolipid metabolism that is abundant in cell membranes. It is localized in the lysosome, where it remains associated with the lysosomal membrane. β-Glucocerebrosidase is 497 amino acids in length and has a molecular weight of 59,700 Daltons.
Glucocerebroside is any of the cerebrosides in which the monosaccharide head group is glucose.
α-Galactosidase is a glycoside hydrolase enzyme that catalyses the following reaction:
Alglucerase was a biopharmaceutical drug for the treatment of Gaucher's disease. It was a modified form of human β-glucocerebrosidase enzyme, where the non-reducing ends of the oligosaccharide chains have been terminated with mannose residues.
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Velaglucerase alfa, sold under the brand name Vpriv, is a medication used for the treatment of Gaucher disease Type 1. It is a hydrolytic lysosomal glucocerebroside-specific enzyme, which is a recombinant form of glucocerebrosidase. It has an identical amino acid sequence to the naturally occurring enzyme. It is manufactured by Shire plc.
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Eliglustat, sold under the brand name Cerdelga, is a medication used for the treatment of Gaucher's disease. It was discovered at the University of Michigan, developed by Genzyme Corp, and was approved by the FDA in August 2014. Commonly used as the tartrate salt, the compound is believed to work by inhibition of glucosylceramide synthase. According to an article in Journal of the American Medical Association the oral substrate reduction therapy resulted in "significant improvements in spleen volume, hemoglobin level, liver volume, and platelet count" in untreated adults with Gaucher disease Type 1.
Amicus Therapeutics is a public American biopharmaceutical company based in Philadelphia, PA. The company went public in 2007 under the NASDAQ trading symbol FOLD. This followed a 2006 planned offering and subsequent withdrawal, which would have established the trading symbol as AMTX Prior to their IPO, Amicus was funded by a variety of venture capital firms including Radius Ventures, Canaan Partners and New Enterprise Associates.
Migalastat, sold under the brand name Galafold, is a medication for the treatment of Fabry disease, a rare genetic disorder. It was developed by Amicus Therapeutics. The US Food and Drug Administration (FDA) granted it orphan drug status in 2004, and the European Commission followed in 2006. The European Medicines Agency's Committee for Medicinal Products for Human Use (CHMP) granted the drug a marketing approval under the name Galafold in May 2016.
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