金黄色葡萄球菌肠毒素B对人鼻黏膜上皮细胞的促炎作用

目的探讨金黄色葡萄球菌肠毒素B（staphylococcus aureus enterotoxin B，SEB）对原代培养的人鼻黏膜上皮细胞释放促炎因子和（或）趋化因子的作用。方法将无血清原代培养的人鼻息肉及下鼻甲上皮细胞分别在SEB1、10、100ns／ml，白细胞介素（intedeukin，IL）1β 20ng／ml及SEB 10ng／ml＋地塞米松13ng／ml等不同条件下孵育，12、24和48h后采用原位杂交方法检测鼻黏膜上皮细胞分泌的IL-5和粒细胞巨噬细胞集落刺激因子（granuloyte macrophagc colony stimulating factor，GM-CSF）在mRNA水平的变化。结果①SEB刺激鼻黏膜上皮时，IL-5和GM—CSF mRNA表达增加，在一定范围内呈现时间和剂量依赖性，以10ng／ml、24h时最明显（P〈0．05），且鼻息肉组的表达高于下鼻甲组，差异具有统计学意义（P〈0．05）；②IL-1β 20ng／ml组IL-5和GM-CSF mRNA表达增加不及SEB 10ng／ml组明显，差异具有统计学意义（P值均〈0．05）；③SEB 10ng/ml＋地塞米松13ng／ml组的IL-5和GM-CSF mRNA表达强度较SEB 10ng／ml组弱，差异具有统计学意义（P值均〈0．05）。结论SEB对原代培养的人鼻黏膜上皮细胞具有促炎作用。

Proinflammatory effects of staphylococcus aureus enterotoxin B on human nasal epithelial cells

OBJECTIVE: To evaluate the effects of Staphylococcus aureus enterotoxin B (SEB) on proinflammatory cytokine/chemokine releases in primary human nasal epithelial cell (HNEC). METHODS: Epithelial cells of nasal polyps (NP) and inferior turbinate (IT) were cultured without serum under stimulus of SEB 1, 10, 100 ng/ml, IL-1beta 20 ng/ml and SEB 10 ng/ml + dexamethasone 13 ng/ml for 12,24 and 48 h, respectively. The expression of IL-5 and Granulocyte-macrophage colony stimulating factor (GM-CSF) mRNA derived from epithelial cells was detected by in situ hybridization. RESULTS: (1) The expression of IL-5 and GM-CSF mRNA was time and dose-dependent, and reached to a peak under SEB 10 ng/ml for 24 h (P < 0.05). The mRNA expressed more intensively in epithelial cells from NP than IT (P < 0.05). (2) The expression of IL-5 and GM-CSF mRNA increased less under the stimulus of IL-1beta than SEB 10 ng/ml (P < 0.05). (3) The mRNA level of IL-5 and GM-CSF decreased under the stimulus of SEB + dexamethasone 13 ng/m when compared with the stimulus of SEB 10 ng/ml (P < 0.05). CONCLUSION: SEB showed proinflammatory effects on HNEC.