The mammalian target of rapamycin （mTOR） pathway is essential for maintenance of the sensitivity of certain adult sensory neurons. Here, we investigated whether the mTOR cascade is involved in scorpion envenomation-...The mammalian target of rapamycin （mTOR） pathway is essential for maintenance of the sensitivity of certain adult sensory neurons. Here, we investigated whether the mTOR cascade is involved in scorpion envenomation-induced pain hypersensitivity in rats. The results showed that intraplantar injection of a neurotoxin from Buthus martensii Karsch, BmK I （10 pg）, induced the activation of mTOR, as well as its downstream molecules p70 ribosomal S6 protein kinase （p70 S6K） and eukaryotic initiation factor 4E-binding protein 1 （4E-BP1）, in lumbar 5-6 dorsal root ganglia neurons on both sides in rats. The activation peaked at 2 h and recovered 1 day after injection. Compared with the control group, the ratios of p-mTOR/p-p70 S6K/p-4E- BP1 in three types of neurons changed significantly. The cell typology of p-mTOR/p-p70 S6K/p-4E-BP1 immuno-reactive neurons also changed. Intrathecal administration of deforolimus, a specific inhibitor of mTOR, attenuated BmK I-induced pain responses （spontaneous flinching, paroxysmal pain-like behavior, and mechanical hypersensitivity）. Together, these results imply that the mTOR signaling pathway is mobilized by and contributes to experimental scorpion sting-induced pain.展开更多
Dear Editor,As the key contributor to the rising phase of action potentials in dorsal root ganglion（DRG）neurons,voltagegated sodium channels（VGSCs）are important in physiological and pathological pain conditions.Fo...Dear Editor,As the key contributor to the rising phase of action potentials in dorsal root ganglion（DRG）neurons,voltagegated sodium channels（VGSCs）are important in physiological and pathological pain conditions.For instance,abnormal expression of VGSCs in DRG neurons is the展开更多
为了研究Bm K IT提高Ac MNPV抗虫活性的作用机制,将Bm K IT基因插入到Ac MNPV中形成重组病毒。采用重组单价病毒Ac MNPV-Bm K IT(IE1)、Ac MNPV-Bm K IT(P10)、Ac MNPV-Bm K IT(PH)和一种重组双价病毒Ac MNPV-Bm K IT(P10)-vcath(PH),...为了研究Bm K IT提高Ac MNPV抗虫活性的作用机制,将Bm K IT基因插入到Ac MNPV中形成重组病毒。采用重组单价病毒Ac MNPV-Bm K IT(IE1)、Ac MNPV-Bm K IT(P10)、Ac MNPV-Bm K IT(PH)和一种重组双价病毒Ac MNPV-Bm K IT(P10)-vcath(PH),通过四唑盐比色法(MTT)和蛋白质印迹法(Western Blot)分析了Bm K IT在Ac MNPV的3个启动子调控下对Sf9细胞增殖和细胞凋亡的影响,结果显示,感染病毒36,48 h Bm K IT在不同启动子调控下表达量从高到低依次为PH、P10、IE1。同时分析了Ac MNPV介导的Bm K IT与组织蛋白酶的协同表达对昆虫Sf9细胞增殖和调亡的机制,结果表明,Ac MNPV-Bm K IT(P10)-vcath(PH)处理组对Sf9细胞抑制率比Ac MNPV-Bm K IT(P10)处理组平均提高了14.5%,凋亡相关蛋白c-Myc、cleaved-Caspase3、Bax表达量增加,Bcl-2表达量减少。展开更多
基金supported by grants from the National Natural Science Foundation of China(No.31272100,31372199)the Natural Science Foundation of Shanxi Province,China(No.2014011038-1)+1 种基金the National High Technology Research and Development Program of China(863 Program,No.2012AA020809)the Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi Province,China
基金supported by grants from the National Basic Research Development Program of China(2010CB529806)the National Natural Science Foundation of China(31171064)+2 种基金the Shanghai Science and Technology CommissionChina(11JC140430010411956700 and 124119b0600)
文摘The mammalian target of rapamycin （mTOR） pathway is essential for maintenance of the sensitivity of certain adult sensory neurons. Here, we investigated whether the mTOR cascade is involved in scorpion envenomation-induced pain hypersensitivity in rats. The results showed that intraplantar injection of a neurotoxin from Buthus martensii Karsch, BmK I （10 pg）, induced the activation of mTOR, as well as its downstream molecules p70 ribosomal S6 protein kinase （p70 S6K） and eukaryotic initiation factor 4E-binding protein 1 （4E-BP1）, in lumbar 5-6 dorsal root ganglia neurons on both sides in rats. The activation peaked at 2 h and recovered 1 day after injection. Compared with the control group, the ratios of p-mTOR/p-p70 S6K/p-4E- BP1 in three types of neurons changed significantly. The cell typology of p-mTOR/p-p70 S6K/p-4E-BP1 immuno-reactive neurons also changed. Intrathecal administration of deforolimus, a specific inhibitor of mTOR, attenuated BmK I-induced pain responses （spontaneous flinching, paroxysmal pain-like behavior, and mechanical hypersensitivity）. Together, these results imply that the mTOR signaling pathway is mobilized by and contributes to experimental scorpion sting-induced pain.
基金supported by grants from the National Natural Science Foundation of China (31571032, 31771191, and 81402903)supported by an Indiana Spinal Cord and Brain Injury Research Fund grant (ISCBIRF2017)
文摘Dear Editor,As the key contributor to the rising phase of action potentials in dorsal root ganglion（DRG）neurons,voltagegated sodium channels（VGSCs）are important in physiological and pathological pain conditions.For instance,abnormal expression of VGSCs in DRG neurons is the
文摘为了研究Bm K IT提高Ac MNPV抗虫活性的作用机制,将Bm K IT基因插入到Ac MNPV中形成重组病毒。采用重组单价病毒Ac MNPV-Bm K IT(IE1)、Ac MNPV-Bm K IT(P10)、Ac MNPV-Bm K IT(PH)和一种重组双价病毒Ac MNPV-Bm K IT(P10)-vcath(PH),通过四唑盐比色法(MTT)和蛋白质印迹法(Western Blot)分析了Bm K IT在Ac MNPV的3个启动子调控下对Sf9细胞增殖和细胞凋亡的影响,结果显示,感染病毒36,48 h Bm K IT在不同启动子调控下表达量从高到低依次为PH、P10、IE1。同时分析了Ac MNPV介导的Bm K IT与组织蛋白酶的协同表达对昆虫Sf9细胞增殖和调亡的机制,结果表明,Ac MNPV-Bm K IT(P10)-vcath(PH)处理组对Sf9细胞抑制率比Ac MNPV-Bm K IT(P10)处理组平均提高了14.5%,凋亡相关蛋白c-Myc、cleaved-Caspase3、Bax表达量增加,Bcl-2表达量减少。
基金This work was supported by National Basic Research Priorities Program of China (1999054001), partially grants from National Nature Sciences Foundation of China (39625010).
