The contribution of an impaired astrocytic K^+ regulation system to epileptic neuronal hyperexcitability has been increasingly recognized in the last decade.A defective K^+ regulation leads to an elevated extracellula...The contribution of an impaired astrocytic K^+ regulation system to epileptic neuronal hyperexcitability has been increasingly recognized in the last decade.A defective K^+ regulation leads to an elevated extracellular K^+ concentration([K^+]o).When[K^+]o reaches peaks of 10-12 mM,it is strongly associated with seizure initiation during hypersynchronous neuronal activities.On the other hand,reactive astrocytes during a seizure attack restrict influx of K^+ across the membrane both passively and actively.In addition to decreased K^+ buffering,aberrant Ca^2+ signaling and declined glutamate transport have also been observed in astrogliosis in epileptic specimens,precipitating an increased neuronal discharge and induction of seizures.This review aims to provide an overview of experimental findings that implicated astrocytic modulation of extracellular K^+ in the mechanism of epileptogenesis.展开更多
目的:探讨泛连接蛋白1(Panx1)在睾丸癌Tcam-2细胞侵袭迁移中的作用及可能机制。方法:用100μmol/L甘珀酸(CBX)和200μmol/L的丙磺舒(PBN)处理Tcam-2细胞后,采用实时荧光法检测细胞间荧光传递能力,化学发光法检测细胞外ATP浓度,Transwel...目的:探讨泛连接蛋白1(Panx1)在睾丸癌Tcam-2细胞侵袭迁移中的作用及可能机制。方法:用100μmol/L甘珀酸(CBX)和200μmol/L的丙磺舒(PBN)处理Tcam-2细胞后,采用实时荧光法检测细胞间荧光传递能力,化学发光法检测细胞外ATP浓度,Transwell法检测Tcam-2细胞的侵袭迁移能力,Western印迹法检测Panx1蛋白在睾丸间质细胞TM3和睾丸癌细胞Tcam-2中的表达及细胞外调节蛋白酶激酶1/2(ERK1/2)、磷酸化ERK1/2(p-ERK1/2)、波形蛋白、基质金属酶蛋白9(MMP-9)和E-钙黏蛋白的表达。结果:Western印迹结果显示,与睾丸间质细胞TM3相比,Panx1蛋白在睾丸癌Tcam-2细胞中表达量显著增高[2.79±0.17 vs 1.00±0.06,P<0.05];用CBX和PBN处理Tcam-2细胞后,实时荧光法和化学发光结果显示,与对照组[(99.50±3.12)%]相比,CBX和PBN显著抑制荧光传递能力[分别下降至(61.54±3.30)%和(68.06±4.03)%,P<0.01]和降低细胞外ATP水平[(110±8.16)%vs(57.06±5.80)%、(56.42±7.70)%,P<0.01];Transwell法和细胞划痕法结果显示,与对照组相比,CBX和PBN显著抑制睾丸癌Tcam-2细胞迁移[(331.00±30.80)个vs(11.5±1.11)、(8.25±1.23),P<0.05]和侵袭[细胞数目为(89.00±13.09)vs(11.75±3.77)、(11.5±3.5)个,P<0.01];Western印迹法结果显示,与对照组表达水平(0.98±0.03、1.093±0.09、1.00±0.09、1.13±0.04)相比,CBX和PBN显著抑制p-ERK1/2(0.538±0.05、0.476±0.02,P<0.05)、波形蛋白(0.541±0.09、0.705±0.07,P<0.01)、MMP-9蛋白表达(0.439±0.08、0.557±0.065,P<0.01),增强E-钙黏蛋白表达(3.896±0.06、3.551±0.04,P<0.01)。结论:Panx1通道蛋白在睾丸癌Tcam-2细胞中表达量增高,CBX和PBN抑制Panx1通道后,Tcam-2细胞侵袭迁移能力降低。展开更多
基金supported partially by Helen Vosburg Mc Crillus PlummerRobert Edward Lee Plummer,Jr.Chair in Neurosurgery(to JHH)NIH-R01-NS-067435(to JHH)
文摘The contribution of an impaired astrocytic K^+ regulation system to epileptic neuronal hyperexcitability has been increasingly recognized in the last decade.A defective K^+ regulation leads to an elevated extracellular K^+ concentration([K^+]o).When[K^+]o reaches peaks of 10-12 mM,it is strongly associated with seizure initiation during hypersynchronous neuronal activities.On the other hand,reactive astrocytes during a seizure attack restrict influx of K^+ across the membrane both passively and actively.In addition to decreased K^+ buffering,aberrant Ca^2+ signaling and declined glutamate transport have also been observed in astrogliosis in epileptic specimens,precipitating an increased neuronal discharge and induction of seizures.This review aims to provide an overview of experimental findings that implicated astrocytic modulation of extracellular K^+ in the mechanism of epileptogenesis.
文摘目的:探讨泛连接蛋白1(Panx1)在睾丸癌Tcam-2细胞侵袭迁移中的作用及可能机制。方法:用100μmol/L甘珀酸(CBX)和200μmol/L的丙磺舒(PBN)处理Tcam-2细胞后,采用实时荧光法检测细胞间荧光传递能力,化学发光法检测细胞外ATP浓度,Transwell法检测Tcam-2细胞的侵袭迁移能力,Western印迹法检测Panx1蛋白在睾丸间质细胞TM3和睾丸癌细胞Tcam-2中的表达及细胞外调节蛋白酶激酶1/2(ERK1/2)、磷酸化ERK1/2(p-ERK1/2)、波形蛋白、基质金属酶蛋白9(MMP-9)和E-钙黏蛋白的表达。结果:Western印迹结果显示,与睾丸间质细胞TM3相比,Panx1蛋白在睾丸癌Tcam-2细胞中表达量显著增高[2.79±0.17 vs 1.00±0.06,P<0.05];用CBX和PBN处理Tcam-2细胞后,实时荧光法和化学发光结果显示,与对照组[(99.50±3.12)%]相比,CBX和PBN显著抑制荧光传递能力[分别下降至(61.54±3.30)%和(68.06±4.03)%,P<0.01]和降低细胞外ATP水平[(110±8.16)%vs(57.06±5.80)%、(56.42±7.70)%,P<0.01];Transwell法和细胞划痕法结果显示,与对照组相比,CBX和PBN显著抑制睾丸癌Tcam-2细胞迁移[(331.00±30.80)个vs(11.5±1.11)、(8.25±1.23),P<0.05]和侵袭[细胞数目为(89.00±13.09)vs(11.75±3.77)、(11.5±3.5)个,P<0.01];Western印迹法结果显示,与对照组表达水平(0.98±0.03、1.093±0.09、1.00±0.09、1.13±0.04)相比,CBX和PBN显著抑制p-ERK1/2(0.538±0.05、0.476±0.02,P<0.05)、波形蛋白(0.541±0.09、0.705±0.07,P<0.01)、MMP-9蛋白表达(0.439±0.08、0.557±0.065,P<0.01),增强E-钙黏蛋白表达(3.896±0.06、3.551±0.04,P<0.01)。结论:Panx1通道蛋白在睾丸癌Tcam-2细胞中表达量增高,CBX和PBN抑制Panx1通道后,Tcam-2细胞侵袭迁移能力降低。
