Ocriplasmin: Difference between revisions
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Revision as of 23:16, 23 July 2015
| Clinical data | |
|---|---|
| Trade names | Jetrea |
| AHFS/Drugs.com | jetrea |
| Routes of administration | Intravitreal |
| ATC code | |
| Legal status | |
| Legal status |
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| Formula | C1214H1890N338O348S14 |
| Molar mass | 27.25 kDa g·mol−1 |
Ocriplasmin (trade name Jetrea) is a recombinant protease with activity against fibronectin and laminin, components of the vitreoretinal interface. It is used for treatment of symptomatic vitreomacular adhesion, for which it received FDA approval on 17 October 2012. It works by dissolving the proteins that link the vitreous to the macula, resulting in posterior detachment of the vitreous from the retina.[1]
Structure and mechanism of action
Structure
Ocriplasmin is an injectable drug that is "a truncated form of the human serine protease plasmin." The protease plasmin still retains its enzymatic properties.[2] Ocriplasmin consists of two polypeptide chains that are linked by disulfide bonds. Additionally, the longer peptide chain has four disulfide bonds. Ocriplasmin is only moderately stable when injected, and this is due to autolytic degradation.[3]
Mechanism
Ocriplasmin can degrade various structural proteins, including laminin and fibronectin, which are localized in the vitreoretinal surface. Here, these two proteins are involved in vitreoretinal attachment. Ocriplasmin induces posterior vitreous detachment.[3]
FDA regulation
ThromboGenics, the manufacturer of ocriplasmin, encountered several problems when trying to get approval for the drug. In 2012, the FDA brought up the problem of adverse side effects associated with the drug. The FDA stated that the adverse effects may not cause long-term harm, but that conclusion could not be definitively made.[4] Several days later, the FDA endorsed ocriplasmin, which was still an experimental drug. The advisory committee brought up several safety issues, but the committee ended up voting that no additional studies were needed.[5] This may be controversial, considering the drug underwent only two studies.[6]
Sales
As part of a deal with Alcon, ThromboGenics received $98.4 million for the ex-US rights to ocriplasmin. This is part of a $500 million-plus deal. ThromboGenics is set to receive a $123 million-plus payment in the near future, when ocriplasmin is approved in Europe; this is expected within the next year.[7]
60% of the market of ocriplasmin is in the United States, with more than a quarter of a million patients.[7]
References
- ^ Stalmans, P; Benz, MS; Gandorfer, A; Kampik, A; Girach, A; Pakola, S; Haller, JA; MIVI-TRUST Study, Group (Aug 16, 2012). "Enzymatic vitreolysis with ocriplasmin for vitreomacular traction and macular holes". The New England Journal of Medicine. 367 (7): 606–15. doi:10.1056/NEJMoa1110823. PMID 22894573.
- ^ "FDA panel backs ocriplasmin." (2012) European Biotechnology News.
- ^ a b Aerts F, Noppen B, Fonteyn N, Derua R, Waelkens E, deSmet MD, Vanhove M. (2012) "Mechanism of inactivation of ocriplasmin in porcine vitreous." Biophysical Chemistry. 165-166:30-38.
- ^ Carroll J. (2012) "ThromboGenics jolted with safety questions on eve of FDA panel review." FierceBiotech.
- ^ McBride R. (2012) "ThromboGenics wins FDA panel nod for eye drug." FierceBiotech.
- ^ Brown T. (2012) "FDA approvals: ocriplasmin for vitreomacular adhesions." MedScape.
- ^ a b Moran N. (2013) "ThromboGenics Signs Potential $494M Ex-U.S. Ocriplasmin Deal." BioWorld.
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