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gi蛋白
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  gi protein
    Furthermore, it was n oticeable that the I-V shift of sodium channel in PTX-treated neurons was significantly similar to that of resistant cotton bollworm, which indicated that Gi protein might participate in the evolution of resist ance to insecticide.
    同时,经百日咳毒素处理后钠通道的I-V曲线与抗性棉铃虫I-V曲线非常相似,可能暗示Gi蛋白在棉铃虫抗药性形成中发挥作用。
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  gi protein
These data provide evidence that the plasma membrane of starfish oocytes contains a 40-kDa GTP-binding protein with properties characteristic of the alpha subunit of the inhibitory Gi protein.
      
In cardiac fibroblasts AngII activated MAP kinases through a pathway including the Gβγ subunit of Gi protein, Src, Shc, Grb2, and Ras, while Gq and PKC activation was necessary in cardiac myocytes.
      
With the list of candidate genes for this disorder steadily increasing, the pertussis toxin-sensitive inhibitory G protein (Gi) protein β3 subunit (GNB3) gene has remained "sizzling," challenging the domination of the renin-angiotensin system.
      
Cyclic GMP modulates the expression of Gi protein and adenylyl cyclase signaling in vascular smooth muscle cells
      
They also confirm that the inhibitory action of dopamine is mediated through a Gi protein; and the stimulatory action of dopamine is mediated through a PTX-insensitive pathway.
      
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The modulation of voltage-gate d sodium and calcium channels by pertussis toxin (PTX) sensitive Gi prot ein in the central neurons isolated from three instar larve of the H elicoverpa armigera was studied using whole-cell patch clamp technique. S odium channels were activated when the membrane potential was depolariz ed to-50~-40 mV and the current reached peak value at about-20 mV in control. During the 20 min of recording, little change was shown i n I-V relationship curves and peak value as well. Pretreated...

The modulation of voltage-gate d sodium and calcium channels by pertussis toxin (PTX) sensitive Gi prot ein in the central neurons isolated from three instar larve of the H elicoverpa armigera was studied using whole-cell patch clamp technique. S odium channels were activated when the membrane potential was depolariz ed to-50~-40 mV and the current reached peak value at about-20 mV in control. During the 20 min of recording, little change was shown i n I-V relationship curves and peak value as well. Pretreated with pert ussis toxin, however, sodium channels were activated at about-40 mV a nd current reached peak value at about 0 mV. Moreover, the I-V curve was continually shifted in positive direction during the recording. In addition, the peak current decreased to (70.92±8.76)% of initial peak value by the end of 20 min recording. Calcium channels were activated when the membrane was depolarized to-40~-30 mV and the current was maximized at about 0 mV in control. After treatment with PTX, I-V cur ve was shifted approximately 10 mV in negative direction and the shift was continued during the period of recording. Rundown in current was more apparent than that in control. The time course to reach peak current for calcium channels was obviously prolonged by PTX treatment. Taken together, the results suggested that Gi protein modulates voltag e sensitivity and open probability of sodium and calcium channels via direct or indirection pathways, and affects the rate of gating from closed state to the active in calcium channels. Furthermore, it was n oticeable that the I-V shift of sodium channel in PTX-treated neurons was significantly similar to that of resistant cotton bollworm, which indicated that Gi protein might participate in the evolution of resist ance to insecticide.

用膜片钳技术研究了百日咳毒素对离体培养的棉铃虫幼虫中枢神经细胞电压门控钠、钙通道的影响。结果表明,对照组细胞钠通道在-50~-40mV激活,在-20mV左右电流达到最大值,在记录的20min内,电流-电压关系曲线(I-V)和电流幅值未有明显变化;细胞与百日咳毒素预孵后,钠通道在-40mV左右激活,电流在0mV左右达到最大值,在记录过程中,激活电压和峰值电压继续向正方向移动约10mV,电流持续下降。对照组钙通道在-40~-30mV激活,在0mV左右电流达峰值;经百日咳毒素处理后,I-V曲线向负电位方向移动约10mV,在记录过程中,I-V曲线继续向负电位方向移动,电流的衰减(rundown)现象比对照组严重,此外,百日咳毒素处理引起钙电流达到峰值的时间显著延长。结果提示,百日咳毒素敏感的G蛋白(Gi)可能通过直接途径或间接途径调节棉铃虫神经细胞钠、钙通道的电压敏感性和开放几率以及钙通道由备用态向激活态转化的速度。同时,经百日咳毒素处理后钠通道的I-V曲线与抗性棉铃虫I-V曲线非常相似,可能暗示Gi蛋白在棉铃虫抗药性形成中发挥作用。

 
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