Prokineticin 2 suppresses GABA-activated current in rat primary sensory neurons

Prokineticin 2 suppresses GABA-activated current in rat primary sensory neurons
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Prokineticin 2 抑制大鼠初级感觉神经元中 GABA 激活的电流

DOI:
10.1016/j.neuropharm.2010.08.014
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发表时间:
2010-12
期刊:
影响因子:
4.7
通讯作者:
Hu, Wang-Ping
Hu, Wang-Ping
中科院分区:
医学2区
文献类型:
--
作者:
Xiong, Yan-Cai;Li, Xue-Mei;Wang, Xue-Jing;Liu, Yu-Qiang;Qiu, Fang;Wu, Dan;Can, Yun-Bo;Wang, Bang-Hua;Hu, Wang-Ping

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前动力蛋白2(PK 2)是一种新发现的调节蛋白,参与哺乳动物包括痛觉在内的多种生理过程。然而,PK 2在伤害感受中的确切作用尚未完全了解。本研究采用全细胞膜片钳技术研究PK 2对大鼠三叉神经节神经元GABA A受体功能的影响。PK 2可逆地抑制GABA A受体激活(IGABA)产生的内向电流,IC 50为0.26 ± 0.02 nM。PK 2似乎降低GABA对GABAA受体的效力,但不降低亲和力。经PK 2预处理后,GABA量效曲线的最大反应下降至对照组的71.2 ± 7.0%,而阈值和EC_(50)无明显变化。PK 2对IGABA的作用不依赖于电压。PK 2对IGABA的抑制作用可通过胞内透析GDP-β-S(一种不可水解的GDP类似物)、EGTA(一种钙离子螯合剂)或GF 109203 X(一种选择性蛋白激酶C抑制剂)而被消除,但不能被H89(一种蛋白激酶A抑制剂)所消除。这些结果表明,PK 2通过G蛋白和蛋白激酶C依赖的信号通路下调初级感觉神经元GABA A受体的功能,这种抑制可能是PK 2诱导的痛觉过敏的基础。
Prokineticin 2 (PK2) is a newly identified regulatory protein, which is involved in a wide range of physiological processes including pain perception in mammals. However, the precise role of PK2 in nociception is yet not fully understood. Here, we investigate the effects of PK2 on GABAAreceptor function in rat trigeminal ganglion neurons using whole-cell patch clamp technique. PK2 reversibly depressed inward currents produced by GABAAreceptor activation (IGABA) with an IC50of 0.26 ± 0.02 nM. PK2 appeared to decrease the efficacy of GABA to GABAAreceptor but not the affinity. The maximum response of the GABA dose–response curve decreased to 71.2 ± 7.0% of control after pretreatment with PK2, while the threshold value and EC50of curve did not alter significantly. The effects of PK2 on IGABAwere voltage independent. The PK2-induced inhibition of IGABAwas removed by intracellular dialysis of either GDP-β-S (a non-hydrolyzable GDP analog), EGTA (a Ca2+chelator) or GF109203X (a selective protein kinase C inhibitor), but not by H89 (a protein kinase A inhibitor). These results suggest that PK2 down-regulates the function of the GABAAreceptor via G-protein and protein kinase C dependent signal pathways in primary sensory neurons and this depression might underlie the hyperalgesia induced by PK2.
DOI: --
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