Activation of acid-sensing ion channels （ASICs） plays an important role in neuroinflammation. Macrophage recruitment to the sites of inflammation is an essential step in host defense. ASIC1 and ASIC3 have been repor...Activation of acid-sensing ion channels （ASICs） plays an important role in neuroinflammation. Macrophage recruitment to the sites of inflammation is an essential step in host defense. ASIC1 and ASIC3 have been reported to mediate the endocytosis and maturation of bone marrow derived macrophages. However, the expression and inflammation-related functions of ASICs in RAW 264.7 cells, another common macrophage, are still elusive. In the present study, we first demonstrated the presence of ASIC 1, ASIC2a and ASIC3 in RAW 264.7 macrophage cell line by using reverse transcriptase polymerase chain reaction （RT-PCR）, Western blotting and immunofluorescence experiments. The non-specific ASICs inhibitor amiloride and specific homomeric ASICla blocker PcTxl reduced the production of iNOS and COX-2 by LPS-induced activating RAW 264.7 cells. Furthermore, not only amiloride but also PcTxl inhibited the migration and LPS-induced apoptosis of RAW 264.7 cells. Taken together, our findings suggest that ASICs promote the inflammatory response and apoptosis of RAW 264.7 cells, and ASICs may serve as a potential novel target for immunological disease therapy.展开更多
Objective: To examine the effects of Tribulus terrestris L.(T. terrestris) extract on the modulation of calcium channels to evaluate its use in topical agents for treatment of atopic dermatitis.Methods: The 70% methan...Objective: To examine the effects of Tribulus terrestris L.(T. terrestris) extract on the modulation of calcium channels to evaluate its use in topical agents for treatment of atopic dermatitis.Methods: The 70% methanol extract of T. terrestris was prepared. Human HEK293 T cells with over-expressed calcium release-activated calcium channel protein 1(Orai1),transient receptor potential vanilloid 1, or transient receptor potential vanilloid 3(TRPV3)were treated with T. terrestris extract. Modulation of ion channels was measured using a conventional whole-cell patch-clamp technique.Results: T. terrestris extract(100 mg/m L) significantly inhibited Orai1 activity in Orai1-stromal interaction molecule 1 co-overexpressed HEK293 T cells. In addition, T. terrestris extract significantly increased the TRPV3 activity compared with 2-Aminoethyl diphenylborinate(100 mmol/L), which induces the full activation of TRPV3.Conclusions: Our results suggest that T. terrestris extract may have a therapeutic potential for recovery of abnormal skin barrier pathologies in atopic dermatitis through modulating the activities of calcium ion channels, Orai1 and TRPV3. This is the first study to report the modulatory effect of a medicinal plant on the function of ion channels in skin barrier.展开更多
Acidosis is a common characteristic of brain damage. Because studies have shown that permeable Ca2＋-acid-sensing ion channels can mediate the toxic effects of calcium ions, they have become new targets against pain a...Acidosis is a common characteristic of brain damage. Because studies have shown that permeable Ca2＋-acid-sensing ion channels can mediate the toxic effects of calcium ions, they have become new targets against pain and various intracranial diseases. However, the mechanism associated with expression of these channels remains unclear. This study sought to observe the expression characteristics of permeable Ca2＋-acid-sensing ion channels during different reperfusion inflows in rats after cerebral ischemia. The rat models were randomly divided into three groups： adaptive ischemia/reperfusion group, one-time ischemia/reperfusion group, and severe cerebral ischemic injury group. Western blot assays and immunofluorescence staining results exhibited that when compared with the one-time ischemia/reperfusion group, acid-sensing ion channel 3 and Bcl-x/I expression decreased in the adaptive ischemia/reperfusion group. Calmodulin expression was lowest in the adaptive ischemia/reperfusion group. Following adaptive reperfusion, common carotid artery flow was close to normal, and the pH value improved. Results verified that adaptive reperfusion following cerebral ischemia can suppress acid-sensing ion channel 3 expression, significantly reduce Ca2＋ influx, inhibit calcium overload, and diminish Ca2＋ toxicity. The effects of adaptive ischemia/reperfusion on suppressing cell apoptosis and relieving brain damage were better than that of one-time ischemia/reperfusion.展开更多
To investigate the effects of coxsackievirus B 3(CVB 3) on ion channel currents in rat ventricular myocytes. Methods.Rat hearts were isolated with collagenase to acquire single ventricular myocytes, L type voltage dep...To investigate the effects of coxsackievirus B 3(CVB 3) on ion channel currents in rat ventricular myocytes. Methods.Rat hearts were isolated with collagenase to acquire single ventricular myocytes, L type voltage dependent calcium channel(VDCC)current (I Ca ),Na + current (I Na ), outward potassium current (I out ), inwardly rectifying potassium current(I KI ) were recorded using whole cell patch clamp techniques. ResultsCVB 3 infection increased I Ca and I out , while decreased I KI ; but it had no obvious effect on I Na . Conclusion.The effects of CVB 3 on I Ca 、 I out 、 I KI may be one of the mechanisms of myocytes damage and the occurrence of abnormal electroactivities induced by CVB 3 infection.展开更多
Acidosis in local environment plays a critical role in cell injury. One key mediator of acidosis-induced cell injury is the acid-sensing ion channels (ASICs), particularly ASIC1a. Herein, we investigated the role of A...Acidosis in local environment plays a critical role in cell injury. One key mediator of acidosis-induced cell injury is the acid-sensing ion channels (ASICs), particularly ASIC1a. Herein, we investigated the role of ASIC1a in acid-induced vascular endothelial cell injury of Henoch-Schonlein purpura (HSP) children. Acid-induced ASIC1a, Calpain and Calcineurin expression in vascular endothelial cells pretreated with IgA1 isolated from HSP were detected by real time quantitative polymerase chain reaction and western blot methods, respectively. Cell cytotoxicity was measured by interleukin-8 and nitric oxide production with ELISA. The results showed acid-induced ASIC1a, Calpain and Calcineurin expression in cells increased, especially at PH6.5. The cytotoxicity of vascular endothelial cells was increased by extracellular acidosis. Moreover non-specific or specific blockers of ASIC1a, Amiloride and PcTX-1 could remarkably decrease these parameters. These findings show that increased [Ca<sup>2+</sup>]i, mediated via ASIC1a, might contribute to acid-induced vascular endothelial cell injury of HSP.展开更多
目的检测酸敏感离子通道3(ASIC3)在胃食管反流大鼠食管黏膜及背根神经节(DRG)中的表达变化,探讨其在胃食管反流病(GERD)发病中的作用。方法将Sprague-Dawley雄性大鼠随机分为实验组(G组)和对照组(S组)。实验组采用限制幽门及结扎胃底方...目的检测酸敏感离子通道3(ASIC3)在胃食管反流大鼠食管黏膜及背根神经节(DRG)中的表达变化,探讨其在胃食管反流病(GERD)发病中的作用。方法将Sprague-Dawley雄性大鼠随机分为实验组(G组)和对照组(S组)。实验组采用限制幽门及结扎胃底方法建立GERD大鼠模型。于造模后15 d处死两组大鼠,通过HE染色对大鼠食管黏膜进行组织病理学检测,通过蛋白质印迹法(Western blotting)和实时定量聚合酶链反应(RT-PCR)检测大鼠食管黏膜及DRG中ASIC3蛋白及mRNA表达变化。结果HE染色显示G组大鼠食管黏膜慢性炎症改变,S组大鼠食管黏膜无异常;Western blotting显示G组大鼠DRG中ASIC3蛋白表达高于S组(6.75±0.74 vs 5.07±0.72)(P<0.05),食管黏膜中ASIC3蛋白表达高于S组(8.04±0.67 vs 7.31±0.740)(P<0.05);RT-PCR同样显示,G组大鼠DRG中ASIC3 mRNA表达高于S组(0.00030±0.00003 vs 0.00013±0.00002)(P<0.05),食管黏膜中ASIC3 mRNA表达高于S组(0.01073±0.00231 vs 0.00088±0.0007)(P<0.05)。结论 ASIC3在DRG及食管黏膜上表达上调可能是导致GERD食管内脏高敏感的原因之一。展开更多
目的:观察强筋壮骨祛风合剂对髓核致炎大鼠背根神经节中3型酸敏感离子通道(acid-sensing ion channel 3,ASIC3)的影响。方法:选取40只清洁级成年雄性SD大鼠,随机分为空白组、假手术组、模型组、阿米洛利组和中药组,每组8只。除空白组外...目的:观察强筋壮骨祛风合剂对髓核致炎大鼠背根神经节中3型酸敏感离子通道(acid-sensing ion channel 3,ASIC3)的影响。方法:选取40只清洁级成年雄性SD大鼠,随机分为空白组、假手术组、模型组、阿米洛利组和中药组,每组8只。除空白组外,其余各组大鼠均手术暴露L5背根神经节。假手术组暴露L5背根神经节后直接缝合切口;模型组和中药组取出大鼠尾部的髓核组织置于暴露的L5背根神经节上,缝合切口;阿米洛利组将取自大鼠尾部的髓核组织置于暴露的L5背根神经节上,并在暴露的L5背根神经节周围滴入含0.1 mg盐酸的阿米洛利药液1 m L,缝合切口。自造模后第1天开始,中药组按5 m L·kg-1以强筋壮骨祛风合剂灌胃,每天2次,连续30 d;空白组、假手术组、模型组不进行药物干预。分别于造模前1 d及造模后3、5、9、15、23、29 d,采用Up-Down法测定大鼠左后足50%机械刺激缩足阈值(50%paw withdrawal threshold,50%PWT)。中药组药物干预结束后,处死所有大鼠,取出L5背根神经节分成2份,一份采用免疫组织化学法计算ASIC3阳性面积,另一份采用Western Blot技术检测ASIC3蛋白表达量。结果:造模后3 d内,模型组、阿米洛利组和中药组均有部分大鼠出现左后足外翻以及足趾背伸现象。造模前后不同时间50%PWT的差异有统计学意义,即存在时间效应(F=50.132,P=0.000)。5组50%PWT总体上比较,组间差异有统计学意义,即存在分组效应(F=288.219,P=0.000)。除造模前1 d时外(F=0.332,P=0.854),造模后各时点5组大鼠50%PWT比较,组间差异均有统计学意义(F=288.015,P=0.000;F=308.588,P=0.000;F=374.945,P=0.000;F=560.713,P=0.000;F=343.043,P=0.000;F=459.914,P=0.000);造模后各时点模型组的50%PWT均低于空白组、假手术组、阿米洛利组和中药组(P=0.010,P=0.011,P=0.001,P=0.001;P=0.023,P=0.022,P=0.000,P=0.004;P=0.013,P=0.013,P=0.003,P=0.001;P=0.012,P=0.002,P=0.002,P=0.002;P=0.004,P=0.000,P=0.000,P=0.000;P=0.003,P=0.005,P=0.003,P=0.013);造模后各时点空白组和假手术组50%PWT比较,差异均无统计学意义(P=0.640,P=0.710,P=0.590,P=0.480,P=0.330,P=0.390);造模后各时点阿米洛利组50%PWT均高于中药组(P=0.021,P=0.011,P=0.013,P=0.002,P=0.001,P=0.005)。时间因素与分组因素存在交互效应(F=2.358,P=0.002)。5组大鼠背根神经节中ASIC3阳性面积和ASIC3蛋白表达量比较,组间差异均有统计学意义(F=205.890,P=0.030;F=101.740,P=0.001);空白组、假手术组、阿米洛利组和中药组背根神经节中ASIC3阳性面积和ASIC3蛋白表达量均小于模型组(P=0.004,P=0.003,P=0.001,P=0.007;P=0.000,P=0.000,P=0.000,P=0.000);阿米洛利组背根神经节中ASIC3阳性面积和ASIC3蛋白表达量均大于中药组(P=0.001;P=0.000)。结论:强筋壮骨祛风合剂可以降低髓核致炎大鼠病变的背根神经节中ASIC3的水平,提高大鼠的疼痛阈值,但其作用效果不及盐酸阿米洛利。展开更多
基金This work was supported by grants from the National Natural science Foundation of China （No. 81473199）, and the Fundamental Research Funds for the Central Universities （No, 015TS 125）.
文摘Activation of acid-sensing ion channels （ASICs） plays an important role in neuroinflammation. Macrophage recruitment to the sites of inflammation is an essential step in host defense. ASIC1 and ASIC3 have been reported to mediate the endocytosis and maturation of bone marrow derived macrophages. However, the expression and inflammation-related functions of ASICs in RAW 264.7 cells, another common macrophage, are still elusive. In the present study, we first demonstrated the presence of ASIC 1, ASIC2a and ASIC3 in RAW 264.7 macrophage cell line by using reverse transcriptase polymerase chain reaction （RT-PCR）, Western blotting and immunofluorescence experiments. The non-specific ASICs inhibitor amiloride and specific homomeric ASICla blocker PcTxl reduced the production of iNOS and COX-2 by LPS-induced activating RAW 264.7 cells. Furthermore, not only amiloride but also PcTxl inhibited the migration and LPS-induced apoptosis of RAW 264.7 cells. Taken together, our findings suggest that ASICs promote the inflammatory response and apoptosis of RAW 264.7 cells, and ASICs may serve as a potential novel target for immunological disease therapy.
基金Supported by the Convergence of Conventional Medicine and Traditional Koran Medicine R&D Program funded by the Ministry of Health&Welfare through the Korean Health Industry Development Institute(Grant No.HI15C0256)
文摘Objective: To examine the effects of Tribulus terrestris L.(T. terrestris) extract on the modulation of calcium channels to evaluate its use in topical agents for treatment of atopic dermatitis.Methods: The 70% methanol extract of T. terrestris was prepared. Human HEK293 T cells with over-expressed calcium release-activated calcium channel protein 1(Orai1),transient receptor potential vanilloid 1, or transient receptor potential vanilloid 3(TRPV3)were treated with T. terrestris extract. Modulation of ion channels was measured using a conventional whole-cell patch-clamp technique.Results: T. terrestris extract(100 mg/m L) significantly inhibited Orai1 activity in Orai1-stromal interaction molecule 1 co-overexpressed HEK293 T cells. In addition, T. terrestris extract significantly increased the TRPV3 activity compared with 2-Aminoethyl diphenylborinate(100 mmol/L), which induces the full activation of TRPV3.Conclusions: Our results suggest that T. terrestris extract may have a therapeutic potential for recovery of abnormal skin barrier pathologies in atopic dermatitis through modulating the activities of calcium ion channels, Orai1 and TRPV3. This is the first study to report the modulatory effect of a medicinal plant on the function of ion channels in skin barrier.
基金supported by the National Natural Science Foundation of China,No.30872665
文摘Acidosis is a common characteristic of brain damage. Because studies have shown that permeable Ca2＋-acid-sensing ion channels can mediate the toxic effects of calcium ions, they have become new targets against pain and various intracranial diseases. However, the mechanism associated with expression of these channels remains unclear. This study sought to observe the expression characteristics of permeable Ca2＋-acid-sensing ion channels during different reperfusion inflows in rats after cerebral ischemia. The rat models were randomly divided into three groups： adaptive ischemia/reperfusion group, one-time ischemia/reperfusion group, and severe cerebral ischemic injury group. Western blot assays and immunofluorescence staining results exhibited that when compared with the one-time ischemia/reperfusion group, acid-sensing ion channel 3 and Bcl-x/I expression decreased in the adaptive ischemia/reperfusion group. Calmodulin expression was lowest in the adaptive ischemia/reperfusion group. Following adaptive reperfusion, common carotid artery flow was close to normal, and the pH value improved. Results verified that adaptive reperfusion following cerebral ischemia can suppress acid-sensing ion channel 3 expression, significantly reduce Ca2＋ influx, inhibit calcium overload, and diminish Ca2＋ toxicity. The effects of adaptive ischemia/reperfusion on suppressing cell apoptosis and relieving brain damage were better than that of one-time ischemia/reperfusion.
文摘To investigate the effects of coxsackievirus B 3(CVB 3) on ion channel currents in rat ventricular myocytes. Methods.Rat hearts were isolated with collagenase to acquire single ventricular myocytes, L type voltage dependent calcium channel(VDCC)current (I Ca ),Na + current (I Na ), outward potassium current (I out ), inwardly rectifying potassium current(I KI ) were recorded using whole cell patch clamp techniques. ResultsCVB 3 infection increased I Ca and I out , while decreased I KI ; but it had no obvious effect on I Na . Conclusion.The effects of CVB 3 on I Ca 、 I out 、 I KI may be one of the mechanisms of myocytes damage and the occurrence of abnormal electroactivities induced by CVB 3 infection.
文摘Acidosis in local environment plays a critical role in cell injury. One key mediator of acidosis-induced cell injury is the acid-sensing ion channels (ASICs), particularly ASIC1a. Herein, we investigated the role of ASIC1a in acid-induced vascular endothelial cell injury of Henoch-Schonlein purpura (HSP) children. Acid-induced ASIC1a, Calpain and Calcineurin expression in vascular endothelial cells pretreated with IgA1 isolated from HSP were detected by real time quantitative polymerase chain reaction and western blot methods, respectively. Cell cytotoxicity was measured by interleukin-8 and nitric oxide production with ELISA. The results showed acid-induced ASIC1a, Calpain and Calcineurin expression in cells increased, especially at PH6.5. The cytotoxicity of vascular endothelial cells was increased by extracellular acidosis. Moreover non-specific or specific blockers of ASIC1a, Amiloride and PcTX-1 could remarkably decrease these parameters. These findings show that increased [Ca<sup>2+</sup>]i, mediated via ASIC1a, might contribute to acid-induced vascular endothelial cell injury of HSP.
文摘目的检测酸敏感离子通道3(ASIC3)在胃食管反流大鼠食管黏膜及背根神经节(DRG)中的表达变化,探讨其在胃食管反流病(GERD)发病中的作用。方法将Sprague-Dawley雄性大鼠随机分为实验组(G组)和对照组(S组)。实验组采用限制幽门及结扎胃底方法建立GERD大鼠模型。于造模后15 d处死两组大鼠,通过HE染色对大鼠食管黏膜进行组织病理学检测,通过蛋白质印迹法(Western blotting)和实时定量聚合酶链反应(RT-PCR)检测大鼠食管黏膜及DRG中ASIC3蛋白及mRNA表达变化。结果HE染色显示G组大鼠食管黏膜慢性炎症改变,S组大鼠食管黏膜无异常;Western blotting显示G组大鼠DRG中ASIC3蛋白表达高于S组(6.75±0.74 vs 5.07±0.72)(P<0.05),食管黏膜中ASIC3蛋白表达高于S组(8.04±0.67 vs 7.31±0.740)(P<0.05);RT-PCR同样显示,G组大鼠DRG中ASIC3 mRNA表达高于S组(0.00030±0.00003 vs 0.00013±0.00002)(P<0.05),食管黏膜中ASIC3 mRNA表达高于S组(0.01073±0.00231 vs 0.00088±0.0007)(P<0.05)。结论 ASIC3在DRG及食管黏膜上表达上调可能是导致GERD食管内脏高敏感的原因之一。
