Lipoxygenase and prostaglandin G/H synthase cascades in cardiovascular disease.

Abstract:

:The 12/15-lipoxygenase (LO) cascade governs the generation of 12-hydroperoxy-eicosatetraenoic acid (HPETE) and 15-HPETE from arachidonic acid. The 5-LO pathway plays a fundamental role in the biosynthesis of leukotrienes, essential inflammatory lipid mediators. Cyclooxygenase (COX)-1 and -2 biosynthetic pathways are responsible for prostaglandin and thromboxane formation. Experimental investigations in animal models using 12/15-LO deficient mice, 12/15-LO or 15-LO transgenic mice, or pharmacological 15-LO inhibition have all demonstrated the essential role of 12/15-LO in atherogenesis. The underlying mechanisms are linked to low-density lipoprotein oxidation, pro-inflammatory Th1 cytokine production and enhanced monocyte-endothelial cell interaction. Human genetic studies as well as disruption of the 5-LO gene in mouse models of hyperlipidemia revealed that 5-LO and 5-LO-activating protein are associated with risks of human cardiovascular disease, and that this cascade plays an important role in aortic aneurysm pathogenesis through leukotriene-mediated inflammatory chemokine production. COX-1 plays an active role in atherogenesis via thromboxane A(2), while COX-2-derived prostaglandin (PGI(2)) protects against atherosclerosis in murine models. Recent data demonstrated that selective inhibition of COX-2 augments the risk of cardiovascular events in patients. Selective inhibition or blockade of selective components in these two enzymatic pathways through systemic drug delivery or medical device approaches (e.g., drug-eluting stents) may have therapeutic benefit against certain cardiovascular diseases.

authors

Zhao L,Grosser T,Fries S,Kadakia L,Wang H,Zhao J,Falotico R

doi

10.1586/1744666X.2.4.649

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

649-58

issue

4

eissn

1744-666X

issn

1744-8409

journal_volume

2

pub_type

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