Thromboxane

Thromboxane A2
Thromboxane B2

Thromboxane is a member of the family of lipids known as eicosanoids. The two major thromboxanes are thromboxane A2 and thromboxane B2. The distinguishing feature of thromboxanes is a 6-membered ether-containing ring.

Thromboxane is named for its role in clot formation (thrombosis).

Production

Enzymes and substrates associated with thromoboxane and prostacyclin synthesis.
Eicosanoid synthesis.

Thromboxane-A synthase, an enzyme found in platelets, converts the arachidonic acid derivative prostaglandin H2 to thromboxane.

Mechanism

Thromboxane acts by binding to any of the thromboxane receptors, G-protein-coupled receptors coupled to the G protein Gq.[1]

Functions

Thromboxane is a vasoconstrictor and a potent hypertensive agent, and it facilitates platelet aggregation.

It is in homeostatic balance in the circulatory system with prostacyclin, a related compound. The mechanism of secretion of thromboxanes from platelets is still unclear. They act in the formation of blood clots and reduce blood flow to the site of a clot.

Role of A2 in platelet aggregation

Thromboxane A2 (TXA2), produced by activated platelets, has prothrombotic properties, stimulating activation of new platelets as well as increasing platelet aggregation.

Platelet aggregation is achieved by mediating expression of the glycoprotein complex GP IIb/IIIa in the cell membrane of platelets. Circulating fibrinogen binds these receptors on adjacent platelets, further strengthening the clot.

Pathology

It is believed that the vasoconstriction caused by thromboxanes plays a role in Prinzmetal's angina. Omega-3 fatty acids are metabolized to produce higher levels of TxA,3 which is relatively less potent than TxA2 and PGI3; therefore, there is a balance shift toward inhibition of vasoconstriction and platelet aggregation. It is believed that this shift in balance lowers the incidence of myocardial infarction (heart attack) and stroke. Vasoconstriction and, perhaps, various proinflammatory effects exerted by TxA on tissue microvasculature, is probable reason why the TxA is pathogenic in various diseases, such as ischemia-reperfusion injury.,[2] hepatic inflammatory processes,[3] acute hepatotoxicity [4] etc. TxB2, a stable degradation product of TxA2, plays a role in acute hepatoxicity induced by acetaminophen.[5][6]

Inhibitors

Thromboxane inhibitors are broadly classified as either those that inhibit the synthesis of thromboxane, or those that inhibit the target effect of it.

Thromboxane synthesis inhibitors, in turn, can be classified regarding which step in the synthesis they inhibit:

The inhibitors of the target effects of thromboxane are the thromboxane receptor antagonist, including terutroban.

Picotamide has activity both as a thromboxane synthase inhibitor and as a thromboxane receptor antagonist.[11]

Ridogrel is another example.

References

  1. ↑ Rat kidney thromboxane receptor: molecular cloning, signal ...
  2. ↑ Ito Y (2003). "Effects of selective cyclooxygenase inhibitors on ischemia/reperfusion-induced hepatic microcirculatory dysfunction in mice". Eur Surg Res 35 (5): 408–16. doi:10.1159/000072174. PMID 12928598.
  3. ↑ Katagiri H (2004). "Role of thromboxane derived from COX-1 and -2 in hepatic microcirculatory dysfunction during endotoxemia in mice". Hepatology 39 (1): 139–150. doi:10.1002/hep.20000. PMID 14752832.
  4. ↑ Yokoyama Y (2005). "Role of thromboxane in producing hepatic injury during a hepatic stress disorder.". Arch Surg. 140 (8): 801–7. doi:10.1001/archsurg.140.8.801. PMID 16103291.
  5. ↑ Cavar I (2011). "Anti-thromboxane B2 antibodies protect against acetaminophen-induced liver injury in mice". Journal of Xenobiotics 1 (1): 38–44. doi:10.4081/xeno.2011.e8.
  6. ↑ Cavar I (2010). "The role of prostaglandin E2 in acute acetaminophen hepatotoxicity in mice". Histol Histopathol 25 (7): 819–830. PMID 20503171.
  7. ↑ American Heart Association: Aspirin in Heart Attack and Stroke Prevention "The American Heart Association recommends aspirin use for patients who've had a myocardial infarction (heart attack), unstable angina, ischemic stroke (caused by blood clot) or transient ischemic attacks (TIAs or "little strokes"), if not contraindicated. This recommendation is based on sound evidence from clinical trials showing that aspirin helps prevent the recurrence of such events as heart attack, hospitalization for recurrent angina, second strokes, etc. (secondary prevention). Studies show aspirin also helps prevent these events from occurring in people at high risk (primary prevention)."
  8. ↑ Tohgi, H; S Konno; K Tamura; B Kimura; K Kawano (1992). "Effects of low-to-high doses of aspirin on platelet aggregability and metabolites of thromboxane A2 and prostacyclin". Stroke 23 (10): 1400–1403. doi:10.1161/01.STR.23.10.1400. PMID 1412574.
  9. ↑ Dockens, RC; Santone, KS; Mitroka, JG; Morrison, RA; Jemal, M; Greene, DS; Barbhaiya, RH (Aug 2000). "Disposition of radiolabeled ifetroban in rats, dogs, monkeys, and humans.". Drug metabolism and disposition: the biological fate of chemicals 28 (8): 973–80. PMID 10901709.
  10. ↑ Coxib and traditional NSAID Trialists' (CNT) Collaboration (30 May 2013). "Vascular and upper gastrointestinal effects of non-steroidal anti-inflammatory drugs: meta-analyses of individual participant data from randomised trials". Lancet 382 (9894): 769–79. doi:10.1016/S0140-6736(13)60900-9. PMC 3778977. PMID 23726390.
  11. ↑ Ratti, S; Quarato, P; Casagrande, C; Fumagalli, R; Corsini, A (1998). "Picotamide, an antithromboxane agent, inhibits the migration and proliferation of arterial myocytes". European Journal of Pharmacology 355 (1): 77–83. doi:10.1016/S0014-2999(98)00467-1. PMID 9754941.

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