Indomethacin is well known as a prostaglandin (PG) E©ü synthetase inhibitor, which has antipyretic and anti-inflammatory effects and reduces the risk of cancer Growing tumors greatly induce hypersensitive responses to lipopolysaccharide (LPS). Thus, this study was investigated the effect of indomethacin on the LPS-induced production of cytokines in sarcoma-bearing ICR mice. Indomethacin at doses of 5mg/kg was administered orally 30 minutes before i.p. injection of LPS (8 mg/kg) 5 times for 7 days. LPS remarkedly increased tumor necrosis factor (TNF)- ¥á And interleukin (IL)- 1¥â, levels in both serum and splenic supernatants compared with those in controls, while indomethacin significantly reduced the LPS-increased levels of IL-1¥â, in both serum and supernatants. LPS significantly enhanced IL-2 levels in serum and interferon (IFN)-¥ã levels in supernatants, whereas indomethacin did not affect the LPS- increased levels of IL-2 and IFN-¥ã. These data, therefore, indicate that indomethacin may attenuate the pathogenesis of IL-1¥â, induced by LPS and maintain thetumoricidal cellular immune effects by LPS-increasee production of IL-2 and IFN-¥ã in tumor -bearing state.
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