Leukotriene pathways and in vitro adenotonsillar cell proliferation in children with obstructive sleep apnea.

Chest
Ehab DayyatDavid Gozal

Abstract

The abundant expression of leukotrienes (LTs) and their receptors in adenotonsillar tissues of children with obstructive sleep apnea (OSA) suggest that LT antagonists could be useful in treating OSA. The effects of LTD4 and of LT receptor antagonists zileuton, montelukast, and BAY u9773 were examined on mixed cell cultures prepared from dissociated tonsils or adenoids harvested intraoperatively from children with polysomnographically diagnosed OSA. Proliferation was assessed by (3)[H]-thymidine incorporation, and inflammatory cytokine production (tumor necrosis factor [TNF]-alpha, interleukin [IL]-6, IL-8, IL-10, and IL-12) was assessed in supernatants using enzyme-linked immunosorbent assay. LTD4 elicited dose-dependent increases in adenotonsillar cell proliferation (p < 0.001; n = 12). All LT antagonists exhibited dose-dependent reductions in adenotonsillar cellular proliferation rates, with montelukast more than BAY u9773 more than zileuton (n = 14/group; p < 0.001). However, BAY u9773 showed partial agonist effects and increased cellular proliferation at higher concentrations (10(-4) mmol/L; p < 0.01; n = 12). LTD4 effects were partially blocked by montelukast and BAY u9773 but not by zileuton. All three antagonists reduced...Continue Reading

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Citations

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