首页> 外文期刊>Journal of Huazhong University of Science and Technology >The Effects of Protein Kinase C (PKC) on the Tension of Normal and Passively Sensitized Human Airway Smooth Muscle and the Activity of Voltage-dependent Delayed Rectifier Potassium Channel (Kv)
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The Effects of Protein Kinase C (PKC) on the Tension of Normal and Passively Sensitized Human Airway Smooth Muscle and the Activity of Voltage-dependent Delayed Rectifier Potassium Channel (Kv)

机译:蛋白激酶C(PKC)对正常和被动敏感的人气道平滑肌张力和电压依赖性延迟整流钾通道(Kv)活性的影响

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摘要

The effects of protein kinase C (PKC) on the tension and the activity of voltage-dependent delayed rectifier potassium channel (K_v) were examined in normal and passively sensitized human airway smooth muscle (HASM), by measuring tones and whole-cell patch clamp techniques, and the K_v activities and membrane potential (E_m) were also detected. The results showed that phorbol 12-myristate 13-acetate (PMA), a PKC activator, caused a concentration-dependent constriction in normal HASM rings. The constriction of the passively sensitized muscle in asthma serum group was significantly higher than that of the normal group (P < 0.05), and the constrictions of both groups were completely abolished by PKC inhibitor Ro31-8220 and calcium channel inhibitor nifedipine. K_v activities of HASM cells were significantly inhibited by PMA, and the E_m became more positive, as compared with the DMSO (a PMA menstruum)-treated group (P < 0.01). This effect could be blocked by Ro31-8220 (P < 0.01). It was concluded that activation of PKC could increase the tones of HASM, which might be related to the reduced K_v activity. In passively sensitized HASM rings, this effect was more notable.
机译:通过测量音调和全细胞膜片钳,检查了正常和被动致敏的人气道平滑肌(HASM)中蛋白激酶C(PKC)对张力和电压依赖性延迟整流钾通道(K_v)活性的影响。技术,还检测了K_v活性和膜电位(E_m)。结果表明,佛波醇12-肉豆蔻酸酯13-乙酸酯(PMA)是一种PKC激活剂,在正常的HASM环中引起浓度依赖性的收缩。哮喘血清组被动致敏肌肉的收缩明显高于正常组(P <0.05),并且PKC抑制剂Ro31-8220和钙通道抑制剂硝苯地平完全消除了两组的收缩。与DMSO(PMA月经)处理组相比,PMA显着抑制了HASM细胞的K_v活性,并且E_m变得更阳性(P <0.01)。 Ro31-8220可以阻止这种效应(P <0.01)。结论是,PKC的激活可以增加HASM的音调,这可能与K_v活性降低有关。在被动敏化的HASM环中,这种影响更为明显。

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