Tumor angiogenesis, the formation of new capillary blood vessels in tumors from pre-existing
vasculature, is required for tumor growth and progression. Eicosanoids, the bioactive
lipids derived from arachidonic acid, possess potent and diverse biological activities.
In response to stimuli, arachidonic acid is mobilized from phospholipid pools and
metabolized by cyclooxygenases (COX), lipoxygenases (LOX), and p450 epoxygenases (EOX)
to form a variety of eicosanoids. The involvement of eicosanoids in tumor angiogenesis
and progression is implicated by the observations that nonsteroidal anti-inflammation
drugs (NSAIDs) reduce tumor growth and angiogenesis. Subsequently, it is found that
the levels of COX-2 and/or 12-LOX are frequently increased in various cancers. Further
studies using molecular and pharmacological approaches have found that COX-2 and 12-LOX,
when overexpressed in carcinoma cells, enhance their angiogenic potential and stimulate
tumor growth. In this article, we discuss how COX and LOX in cancer cells modulate
tumor angiogenesis and present the possibility of using NSAIDs and LOX inhibitors
as antiangiogenesis agents.
KEYWORDS
Angiogenesis - cancer - eicosanoids - arachidonic acid - nonsteroidal anti-inflammatory
drugs
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Kenneth HonnPh.D.
Departments of Radiation Oncology and Pathology, Wayne State University School of
Medicine and Karmanos Cancer Institute
431 Chemistry Bldg., Detroit, MI 48202
Email: k.v.honn@wayne.edu