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Thromboxane A 2 (TXA 2) is generated from prostaglandin H 2 by thromboxane-A synthase in a metabolic reaction which generates approximately equal amounts of 12-hydroxyheptadecatrienoic acid (12-HHT). Aspirin irreversibly inhibits platelet cyclooxygenase 1 preventing the formation of prostaglandin H 2, and therefore TXA 2.
Thromboxane A synthase 1 (EC 5.3.99.5, platelet, cytochrome P450, family 5, subfamily A), also known as TBXAS1, is a cytochrome P450 enzyme that, in humans, is ...
Thromboxane-A synthase, an enzyme found in platelets, converts the arachidonic acid derivative prostaglandin H 2 to thromboxane. People with asthma tend to have increased thromboxane production, and analogs of thromboxane act as bronchoconstrictors in patients with asthma.
[citation needed] A dose of 40 mg of aspirin a day is able to inhibit a large proportion of maximum thromboxane A 2 release provoked acutely, with the prostaglandin I2 synthesis being little affected; however, higher doses of aspirin are required to attain further inhibition. [15]
A decrease in Thromboxane-A synthase leads to an increase in prostaglandin E2 levels which may affect erythroid precursor cells by suppressing them which likely leads to refractory anemia. [ 15 ] There are still unanswered questions about the effect of a compromised TBXAS1 gene function and its effect in Ghosal hematodiaphyseal dysplasia.
Prostaglandin E 2 (PGE 2) — the most abundant prostaglandin [10] — is generated from the action of prostaglandin E synthases on prostaglandin H 2 (prostaglandin H2, PGH 2). Several prostaglandin E synthases have been identified. To date, microsomal (named as misoprostol) prostaglandin E synthase-1 emerges as a key enzyme in the formation of ...
U46619 is a stable synthetic analog of the endoperoxide prostaglandin PGH 2 first prepared in 1975, [1] and acts as a thromboxane A 2 (TP) receptor agonist. It potently stimulates TP receptor-mediated, but not other prostaglandin receptor-mediated responses in various in vitro preparations and exhibits many properties similar to thromboxane A 2, including shape change and aggregation of ...
The thromboxane receptor (TP) also known as the prostanoid TP receptor is a protein that in humans is encoded by the TBXA2R gene, The thromboxane receptor is one among the five classes of prostanoid receptors [5] and was the first eicosanoid receptor cloned. [6] The TP receptor derives its name from its preferred endogenous ligand thromboxane A ...