白细胞介素13抑制肾小球系膜细胞增殖及白细胞介素6表达

Inhibitory effect of interleukin-13 on cell proliferation and interleukin-6 production in mesangial cells

目的 :探讨白细胞介素 13(IL - 13)对体外培养的大鼠系膜细胞的增殖及其产生白细胞介素 6 (IL -6 )的影响。方法 :用四甲基偶氮唑 (MTT)法测定系膜细胞增殖 ,用逆转录聚合酶链反应 (RT -PCR)及酶联免疫吸附法 (ELISA)测定系膜细胞IL - 6mRNA表达及其蛋白水平。结果 :IL - 13在 1、10、10 0 μg/L浓度范围呈剂量依赖性地抑制系膜细胞的增殖 ;5 %FCSRPMI16 40培养条件下系膜细胞IL - 6mRNA表达及IL - 6分泌水平较低 ,脂多糖 (LPS)可刺激系膜细胞IL - 6mRNA的表达及提高IL - 6分泌水平 ,而IL - 13可抑制LPS诱导的系膜细胞IL - 6分泌及其mRNA表达。结论 :IL - 13抑制体外培养的系膜细胞增殖及LPS诱导的系膜细胞IL - 6的产生 ,IL - 13可能对于肾小球肾炎的系膜细胞炎症反应具有拮抗作用。

AIM: To investigate the effect of interleukin-13 (IL-13) on cell proliferation and interleukin-6 (IL-6) production in mesangial cells. METHODS: Cell proliferation was tested by MTT method. The protein synthesis of IL-6 in mesangial cells was measured by ELISA. The expression of IL-6 mRNA in mesangial cells was evaluated by RT-PCR. RESULTS: IL-13(1 μg/L-100 μg/L) inhibited the proliferation of mesangial cell in a dose-dependent manner. Both mRNA and protein of IL-6 in mesangial cells were increased significantly in the presence of LPS and this increase could be reversed by IL-13 (1μg/L-100μg/L). However, this increase could not be reversed by IL-13 if the dose was lower than 0.1μg/L and if the mesangial cells were cultured in 5% FCS RPMI1640. CONCLUSION: IL-13 could inhibit IL-6 expression induced by LPS in mesangial cells . We suggested that IL-13 may be an inhibitory cytokine in the regulation of the mesangial cell proliferaltion and inflammatory reaction in glomerulonephritis.