Abstract
Cyclo-oxygenase (COX) converts free arachidonic acid to prostaglandin (PG)H2, the precursor to a group of lipid mediators including prostacyclin (PGI2), PGE2, and thromboxane (TX) A2. The predominant COX metabolite released from vessels is PGI2, which is a vasodilator, and an inhibitor of cellular proliferation, platelet adhesion and activation, and cholesterol metabolism (see Willis et al., 1986; Hajjar and Pomerantz, 1992). COX is now known to exist in at least 2 different isoforms; a constitutively expressed COX-1, and a cytokine inducible COX-2 (see Mitchell et al., 1995). Within vessels COX-1 is normally the dominant isoform, and is concentrated mainly in the endothelial cell layer. The underlying vascular smooth muscle has lower COX activity, but is a rich source of PGI2 synthetase. In animal models, COX-2 is induced in the vascular smooth muscle layer after mechanical damage to the vessel (Rimarchin et al., 1994). However, the expression of COX-2 in human vessels has not been demonstrated.
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References
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© 1998 Springer Science+Business Media New York
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Bishop-Bailey, D. et al. (1998). Induction of Cyclo-Oxygenase in Human Vessels in vitro . In: Catravas, J.D., Callow, A.D., Ryan, U.S. (eds) Vascular Endothelium. NATO ASI Series, vol 294. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0133-0_18
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DOI: https://doi.org/10.1007/978-1-4899-0133-0_18
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