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The inhibition of COX-2 is paramount for the anti-inflammatory and analgesic function of the selective COX-2 inhibitor celecoxib. However, with regard to this drug's promise for the therapy of advanced cancers, it is unclear whether the inhibition of COX-2 plays a dominant role, and this has become a controversial and intensely researched issue.
Cyclooxygenase-2 (COX-2), also known as prostaglandin-endoperoxide synthase 2 (HUGO PTGS2), is an enzyme that in humans is encoded by the PTGS2 gene. [5] In humans it is one of three cyclooxygenases. It is involved in the conversion of arachidonic acid to prostaglandin H 2, an important precursor of prostacyclin, which is expressed in inflammation.
The impetus for development of selective COX-2 inhibitors was the adverse gastrointestinal side-effects of NSAIDs.Soon after the discovery of the mechanism of action of NSAIDs, strong indications emerged for alternative forms of COX, but little supporting evidence was found.
COX is a common target for anti-inflammatory drugs. The most significant difference between the isoenzymes, which allows for selective inhibition, is the substitution of isoleucine at position 523 in COX-1 with valine in COX-2. The smaller Val 523 residue in COX-2 allows access to a hydrophobic side-pocket in the enzyme (which Ile 523 ...
Rofecoxib is a selective COX-2 inhibitor, or "coxib". Though the class of coxibs includes several agents, degrees of COX-2 selectivity vary among them, with celecoxib (Celebrex) being the least COX-2 selective, and rofecoxib (Vioxx), valdecoxib (Bextra), and etoricoxib (Arcoxia), being highly COX-2 selective. [10]
Etoricoxib, sold under the brand name Arcoxia, is a selective COX-2 inhibitor developed and commercialized by Merck.It is approved in 63 countries worldwide as of 2007, except the United States where the Food and Drug Administration sent a Non Approvable Letter to Merck and required them to provide additional data.
Daniel L. Simmons is a professor of chemistry and former director of the Cancer Research Center at Brigham Young University (BYU). He was the discoverer of the COX-2 enzyme that is the target of celecoxib (Celebrex) and other COX-2 inhibitors.
Parecoxib, along with other COX-2 selective inhibitors, celecoxib, valdecoxib, and mavacoxib, were discovered by a team at the Searle division of Monsanto led by John Talley. [8] [9] Parecoxib is the first parenteral COX-2 selective inhibitor available for clinical use in pain management.