青蒿琥酯对内毒素诱导的一氧化氮合成的抑制作用

目的 :探讨青蒿琥酯对内毒素诱导的巨噬细胞一氧化氮 (NO)合成的影响。方法 :①用内毒素 (LPS)或LPS合并γ 干扰素作为巨噬细胞 (RAW 264.7)的NO合成诱导剂 ,加入不同浓度的青蒿琥酯 ,培养后取上清液 ,用Griess试剂测定NO产生量。②Balb/c小鼠肌肉注射青蒿琥酯 5 0mg·kg^-1·d^-1×3d ,收集腹腔巨噬细胞 ,测定LPS对细胞的NO诱生能力。结果 :LPS 1.0 ,0.2μg·ml^-1或γ-干扰素 100u合并LPS 1.0 ,0.2 ,0.04μg·ml^-1作用于RAW 264.7细胞 ,均可诱导大量NO合成。青蒿琥酯对LPS或LPS合并干扰素诱导的NO合成均有明显的抑制作用 ,其抑制作用具有明显的量效关系。经青蒿琥酯治疗后的小鼠 ,其腹腔巨噬细胞对LPS的反应性降低 ,其受LPS刺激后产生的NO量明显降低。结论 :青蒿琥酯可降低LPS诱导的炎性因子的产生 ,减轻炎症反应。

Inhibitory Effect of Artemin on Endotoxin-induced Nitric Oxide Synthesis

OBJECTIVE: To investigate the effect of Artemin on LPS-induced nitric oxide synthesis in macrophages. METHOD: 1. Nitrite oxide (NO) production of RAW 264.7 cells was induced by LPS or LPS in combination with interferon-gamma (IFN gamma) in the presence or absence of Artemin. The amount of NO in the supernatant of RAW 264.7 cells was detected with Griess reagent. 2. Balb/c mice were injected with Artemin (i.m.) 50 mg.kg-1.d-1 x 3 d, and intraperitoneal macrophages were collected to detect the LPS-induced NO production. RESULT: LPS 1.0, 0.2 microgram.ml-1 or IFN-gamma 100u + LPS 1.0, 0.2, 0.04 microgram.ml-1 could induced a large amount of NO synthesis of RAW 264.7 cells. Artemin showed a significant inhibitory effect on LPS or IFN-gamma + LPS-induced NO production in a dose dependent manner. After treatment with Artemin, the response of Balb/c mice to LPS was reduced, which was showed by a decrease in NO production of intraperitoneal macrophages induced by LPS. CONCLUSION: Artemin could reduce LPS-induced production of inflammatory factors resulting in the inhibition of inflammatory effects.