基础医学与临床 ›› 2014, Vol. 34 ›› Issue (7): 877-881.

• 研究论文 • 上一篇    下一篇

钙敏感受体通过ERK信号通路参与低氧诱导的人气道上皮细胞黏液高分泌

杨红菊1,Juliy M·Perelman2,Victor P. Kolosov2,周向东3   

  1. 1. 重庆医科大学附属第二医院
    2. 俄罗斯医学科学院
    3. 重庆医科大学附属第二医院 呼吸内科
  • 收稿日期:2013-09-22 修回日期:2013-12-21 出版日期:2014-07-05 发布日期:2014-06-24
  • 通讯作者: 周向东 E-mail:zxd999@263.net
  • 基金资助:
    国家自然科学基金(地区基金);国家自然科学基金国际合作项目

Calcium-sensing receptor mediation of hypoxia-induced mucous hypersecretion of human airway epithelial cells by ERK signaling pathway

  • Received:2013-09-22 Revised:2013-12-21 Online:2014-07-05 Published:2014-06-24
  • Contact: Xiang-dong Zhou E-mail:zxd999@263.net

摘要: 目的 探究钙敏感受体(CaSR)在低氧诱导的气道黏液高分泌中的信号通路。 方法 低氧培养箱(37 oC,94%N2-1%O2-5%CO2)培养人气道上皮细胞16HBE复制细胞低氧模型。分为对照组、低氧组、CaSR特异性激动剂CaCl2+低氧组、对照siRNA+低氧组、CaSR-siRNA+低氧组、细胞外信号调节激酶(ERK)信号通路特异性抑制剂U0126+低氧组。RT-PCR检测黏蛋白(MUC)5AC的转录水平,Western blot检测CaSR、ERK1/2及磷酸化ERK1/2 (p-ERK1/2)的蛋白相对含量,ELISA检测MUC5AC的分泌水平,四甲基偶氮唑盐法(MTT)测定细胞的活性。结果 CaSR表达于人气道上皮细胞,转染特异性的CaSR-siRNA明显抑制CaSR的表达。低氧组p-ERK1/2、MUC5AC mRNA和MUC5AC蛋白的相对含量分别为(0.63±0.11、0.51±0.03、0.56±0.07)较对照组(0.27±0.04、0.18±0.04、0.25±0.06)显著增加(P<0.05)。CaSR的激动剂CaCl2可进一步增强低氧引起的上述作用(P<0.05),而转染CaSR-siRNA及给予ERK信号通路特异性抑制剂U0126可抑制低氧引起的上述效应(P<0.05)。 结论 CaSR可通过MEK/ERK1/2信号通路参与低氧诱导的气道黏液高分泌。

关键词: 钙敏感受体, 缺氧, 黏蛋白, ERK

Abstract: Objectlve To explore the signal pathway of calcium-sensing receptor (CaSR) in hypoxia-induced airway mucous hypersecretion. Methods Cultured human airway epithelial cells 16HBE by hypoxia incubator (37 oC,94%N2-1%O2-5%CO2) and divided into 6 groups:control group,hypoxia group,CaSR specific activator CaCl2 group treated with hypoxia,negative-siRNA control group treated with hypoxia,CaSR-siRNA group treated with hypoxia,extracellular signal regulated kinase(ERK) specific inhibitor U0126 group treated with hypoxia.The levels of MUC5AC mRNA were detected by RT-PCR.The protein levels of CaSR,ERK and phosphorylated ERK(p-ERK) were detected by Western blot.The levels of MUC5AC secretion were measured by ELISA.Cell survival rate was measured by MTT assay. Results CaSR protein was expressed in 16HBE and transfection with CaSR-siRNA significantly inhibited the expression of CaSR.In hypoxia group,the levels of p-ERK,MUC5AC mRNA and MUC5AC protein were increased (0.63±0.11,0.51±0.03,0.56±0.07) versus the control group (0.27±0.04,0.18±0.04,0.25±0.06) (P<0.05).CaCl2(a CaSR agonist) amplified the effect of hypoxia(P<0.05). Transfection with CaSR-siRNA or pretreatment with ERK inhibitor decreased the levels of p-ERK,MUC5AC mRNA and MUC5AC protein induced by hypoxia(P<0.05).Conclusion CaSR mediates hypoxia-induced airway mucous hypersecretion through MEK/ERK1/2 signaling pathway.

Key words: calcium-sensing receptor, hypoxia, mucin, ERK

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