Background: Vascular endothelial growth factor (VEGF) is one of the most potent angiogenic mitogens specific for vascular endothelial cells. It also induces vascular hyperpermeability and protein leakage into the extracellular space. Leukotriene D(4) (LTD(4)), one of the cysteinyl leukotrienes (CysLTs), is known to be one of the key molecules of allergic inflammation. The interaction between LTD(4) and VEGF production in human monocytes/macrophages is not well characterized.
Methods: We examined VEGF production by THP-1 cells, a human monocytic leukemia cell line, and human peripheral blood CD14+monocytes/macrophages stimulated with LTD(4) and/or tumor necrosis factor-α (TNF-α). We also determined the inhibitory effects of pranlukast, a CysLT(1) receptor antagonist, on VEGF production by LTD(4) stimulation.
Results: LTD(4) significantly induced VEGF production and enhanced TNF-α-induced VEGF release in THP-1 cells and human peripheral blood CD14+monocytes/macrophages. VEGF mRNA expression was also induced by stimulation of THP-1 cells with LTD(4) and TNF-α. In addition, 10(-7)-10(-10)M pranlukast completely inhibited VEGF production enhanced by LTD(4). The 50% inhibitory concentration (IC50) for VEGF production in THP-1 cells was 10(-10)-10(-11)M.
Conclusions: LTD(4) induced VEGF production and enhanced VEGF release induced by TNF-α via CysLT(1) receptors in human monocytes/macrophages. These effects were completely inhibited by pranlukast.
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