Dorsal root ganglion （DRG） neurons from newborn Wistar rats cultured in vitro were pressurized with 20, 40, 80 or 120 mm Hg compressive Ioadings （1 mm Hg = 0.133 kPa） for 12, 24, 48 or 72 hours, respectively. The ...Dorsal root ganglion （DRG） neurons from newborn Wistar rats cultured in vitro were pressurized with 20, 40, 80 or 120 mm Hg compressive Ioadings （1 mm Hg = 0.133 kPa） for 12, 24, 48 or 72 hours, respectively. The 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide test showed that pressures less than 80 mm Hg had no obvious impact on the activity of DRG neurons. The protein expression levels of transient receptor potential vanilloid receptor 4 （TRPV4）, transient receptor potential vanilloid receptor 1, transient receptor potential channel of melastatin type 8, and transient receptor potential subtype ankyrin 1 were assessed by western blot analysis. The mRNA expression of TRPV4 was assessed by real-time PCR. The results showed that sustained mechanical compression up-regulated TRPV4 mRNA and protein expression in the rat DRG neurons, in a time-dependent fashion. Similar changes were not found in the protein expression of transient receptor potential vanilloid receptor 1, transient receptor potential channel of melastatin type 8, and transient receptor potential subtype ankyrin 1. Images of cells using a laser scanning confocal microscope showed that the sustained mechanical pressure increased the number of responsive DRG neurons and was synergistic on the enhanced Ca^2＋ responses to the TRPV4 phorbol ester agonist 4a-phorbo112, 13-didecanoate and hypotonic solutions. These findings demonstrate that sustained mechanical compressive loading in vitro increases the expression of TRPV4 mRNA and protein in DRG neurons and sensitizes TRPV4 Ca^2＋ signals. Mechanical compression does not impact other ion channels in the transient receptor potential family.展开更多
AIM: To explore the expression of transient receptor potential vanilloid 4(TRPV4) and its physiological meaning in mouse and rat gastric epithelia. METHODS: RT-PCR and immunochemistry were used to detect TRPV4 m RNA a...AIM: To explore the expression of transient receptor potential vanilloid 4(TRPV4) and its physiological meaning in mouse and rat gastric epithelia. METHODS: RT-PCR and immunochemistry were used to detect TRPV4 m RNA and protein expression in mouse stomach and a rat normal gastric epithelial cell line(RGE1-01), while Ca2+-imaging and electrophysiology were used to evaluate TRPV4 channel activity. ATP release was measured by a luciferin-luciferase assay. Gastric emptying was also compared between WT and TRPV4 knockout mice. RESULTS: TRPV4 m RNA and protein were detected in mouse tissues and RGE1-01 cells. A TRPV4-specific agonist(GSK1016790A) increased intracellular Ca2+ concentrations and/or evoked TRPV4-like current activities in WT mouse gastric epithelial cells andRGE1-01 cells, but not TRPV4 KO cells. GSK1016790 A or mechanical stimuli induced ATP release from RGE1-01 cells while TRPV4 knockout mice displayed delayed gastric emptying in vivo. CONCLUSION: TRPV4 is expressed in mouse and rat gastric epithelium and contributes to ATP release and gastric emptying.展开更多
目的:探讨大鼠背根神经节慢性压迫CCD后瞬时感受器电位离子通道香草素受体4(TRPV4)下游信号分子及其在痛觉过敏中的机制。方法:鞘内分别注射TRPV4拮抗剂钌红(RR)、TRPV4反义寡脱氧核苷酸(ASODN)和一氧化氮合成酶(NOS)抑制剂L-NAME,检测...目的:探讨大鼠背根神经节慢性压迫CCD后瞬时感受器电位离子通道香草素受体4(TRPV4)下游信号分子及其在痛觉过敏中的机制。方法:鞘内分别注射TRPV4拮抗剂钌红(RR)、TRPV4反义寡脱氧核苷酸(ASODN)和一氧化氮合成酶(NOS)抑制剂L-NAME,检测CCD大鼠背根神经节DRG内一氧化氮(NO)代谢产物亚硝酸盐(nitrite)含量变化,并观测热刺激缩爪反应潜伏期(PWL)的变化。结果:鞘内分别注射RR、TRPV4 AS ODN和L-NAME后,均能够显著降低CCD大鼠DRG内亚硝酸盐含量(P<0.05),CCD大鼠的热痛敏行为也能够显著改善(P<0.05)。结论:TRPV4及其下游信号分子NO参与介导CCD大鼠的热痛觉过敏。展开更多
目的评价甲泼尼龙对呼吸机相关性肺损伤(VILI)大鼠肺组织瞬时受体电位香草酸4 (TRPV4)/基质金属蛋白酶2/9(MMP-2/MMP-9)信号通路的影响。方法清洁级雄性SD大鼠100只,采用随机数字表法分为5组(n=20):对照组(C组)、机械通气组(V组)、甲泼...目的评价甲泼尼龙对呼吸机相关性肺损伤(VILI)大鼠肺组织瞬时受体电位香草酸4 (TRPV4)/基质金属蛋白酶2/9(MMP-2/MMP-9)信号通路的影响。方法清洁级雄性SD大鼠100只,采用随机数字表法分为5组(n=20):对照组(C组)、机械通气组(V组)、甲泼尼龙组(Mp组)、甲泼尼龙+GSK1016790A组(MpG组)、HC-067047组(H组)。C组不行机械通气,自主呼吸空气4 h;V组机械通气(RR 40次/min,VT 40 m L/kg,I∶E 1∶1,PEEP 0,Fi O221%) 4 h;Mp组在机械通气前20 min静脉输注甲泼尼龙10.0 mg/kg;MpG组在给予甲泼尼龙前20 min静脉输注GSK1016790A 0.025 mg/kg;H组机械通气前30 min静脉输注HC-067047 10.0 mg/kg。机械通气4 h时,检测支气管肺泡灌洗液(BALF)中白细胞介素-1(IL-1)、肿瘤坏死因子-α(TNF-α)、总蛋白浓度,测定肺通透指数(LPI)、肺湿/干质量比(W/D),观察肺组织病理学结果。Western blot法检测肺组织TRPV4、MMP-2、MMP-9的表达水平。结果与C组比较,V组和MpG组BALF中IL-1(ng/m L:84.56±5.35 vs. 144.85±9.39、121.56±7.69)、TNF-α(ng/m L:179.65±45.73 vs. 486.18±94.79、316.93±69.71)、总蛋白(mg/m L:321.29±28.76 vs. 687.78±65.78、476.39±46.67)升高,肺组织LPI [(2.47±0.17)×10^(-3)vs.(6.19±0.29)×10^(-3)、(4.24±0.25)×10^(-3)]、W/D比值(4.42±0.19 vs. 8.83±0.61、6.32±0.41)升高,TRPV4(1.85±0.25 vs.5.81±0.92、3.87±0.65)、MMP-2 (0.44±0.06 vs. 1.16±0.23、0.85±0.11)、MMP-9(0.19±0.03 vs. 0.46±0.09、0.34±0.07)表达上调(P<0.05);与V组比较,Mp组、MpG组和H组BALF中IL-1(ng/m L:144.85±9.39 vs. 89.78±5.91、121.56±7.69、94.23±6.78)、TNF-α(ng/m L:486.18±94.79 vs. 186.42±49.37、316.93±69.71、193.71±51.41)、总蛋白(mg/m L:687.78±65.78 vs. 348.78±31.52、476.39±46.67、359.68±36.12)降低,肺组织LPI [(6.19±0.29)×10^(-3)vs.(2.85±0.14)×10^(-3)、(4.24±0.25)×10^(-3)、(2.97±0.21)×10^(-3)]、W/D比值(8.83±0.61 vs. 4.75±0.22、6.32±0.41、4.82±0.25)降低,TRPV4(5.81±0.92 vs. 2.13±0.29、3.87±0.65、2.35±0.37)、MMP-2 (1.16±0.23 vs. 0.48±0.08、0.85±0.11、0.52±0.08)、MMP-9(0.46±0.09 vs. 0.22±0.04、0.34±0.07、0.25±0.05)表达下调(P<0.05),肺组织病理损伤减轻;与Mp组比较,MpG组BALF中IL-1 (ng/m L:89.78±5.91 vs. 121.56±7.69)、TNF-α(ng/m L:186.42±49.37 vs. 316.93±69.71)、总蛋白(mg/m L:348.78±31.52 vs. 476.39±46.67)升高,肺组织LPI [(2.85±0.14)×10^(-3)vs.(4.24±0.25)×10^(-3)]、W/D比值(4.75±0.22 vs. 6.32±0.41)升高,TRPV4(2.13±0.29 vs. 3.87±0.65)、MMP-2(0.48±0.08 vs. 0.85±0.11)、MMP-9(0.22±0.04 vs. 0.34±0.07)表达上调(P<0.05)。结论甲泼尼龙可减轻大鼠VILI,与其抑制TRPV4/MMP-2/MMP-9信号通路有关。展开更多
目的:通过检测LTB4、TRPV1及CGRP等指标的变化,分析LTB4-TRPV1信号活化在急性胆源性胰腺炎中的作用。方法:取清洁级SD大鼠60只,随机分为正常组、模型组和TRPV1拮抗剂组。采用胆胰管开口十二指肠结扎法制备重症胰腺炎模型,术后3 h,除正...目的:通过检测LTB4、TRPV1及CGRP等指标的变化,分析LTB4-TRPV1信号活化在急性胆源性胰腺炎中的作用。方法:取清洁级SD大鼠60只,随机分为正常组、模型组和TRPV1拮抗剂组。采用胆胰管开口十二指肠结扎法制备重症胰腺炎模型,术后3 h,除正常组外,其余两组开始分组给药,术后12 h,处死全部大鼠,腹主动脉取血并收集胰腺组织备测。用光镜检测胰腺组织超微结构变化,用ELISA技术检测LTB4变化,用Real-time PCR技术检测TRPV1、CGRP变化。结果:正常组胰腺呈浅粉红色;模型组见胰腺坏死、出血,部分可见腹水,腹水含血,光镜下见胰腺腺体结构紊乱,小叶间隔明显增大,腺体实质内可见大片凝固性坏死并伴有出血,坏死灶及周围有大量炎细胞浸润;TRPV1拮抗剂组胰腺组织充血水肿较模型组减轻,未见腹水,光镜下胰腺实质可见少许坏死、出血及少量炎性细胞浸润,其组织病理学评分较模型组下降,有统计学意义,P<0.05。模型组见血淀粉酶、LTB4表达明显上升;TRPV1拮抗剂组血淀粉酶、LTB4表达亦增高但低于模型组,较模型组有统计学意义,P<0.05;模型组胰腺组织TRPV1、CGRP m RNA表达上升;TRPV1拮抗剂组TRPV1、CGRP m RNA表达亦增高但低于模型组,与模型组比较有统计学意义,P<0.05。结论:内源性LTB4活化TRPV1信号在胆道梗阻性胰腺炎中可能发挥至关重要的作用,阻断TRPV1信号转导将为急性胰腺炎的治疗提供新的思路。展开更多
基金the National Natural Science Foundation of China (General Program),No. 30872732the National Natural Science Foundation of China for Youths,No.81101453
文摘Dorsal root ganglion （DRG） neurons from newborn Wistar rats cultured in vitro were pressurized with 20, 40, 80 or 120 mm Hg compressive Ioadings （1 mm Hg = 0.133 kPa） for 12, 24, 48 or 72 hours, respectively. The 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide test showed that pressures less than 80 mm Hg had no obvious impact on the activity of DRG neurons. The protein expression levels of transient receptor potential vanilloid receptor 4 （TRPV4）, transient receptor potential vanilloid receptor 1, transient receptor potential channel of melastatin type 8, and transient receptor potential subtype ankyrin 1 were assessed by western blot analysis. The mRNA expression of TRPV4 was assessed by real-time PCR. The results showed that sustained mechanical compression up-regulated TRPV4 mRNA and protein expression in the rat DRG neurons, in a time-dependent fashion. Similar changes were not found in the protein expression of transient receptor potential vanilloid receptor 1, transient receptor potential channel of melastatin type 8, and transient receptor potential subtype ankyrin 1. Images of cells using a laser scanning confocal microscope showed that the sustained mechanical pressure increased the number of responsive DRG neurons and was synergistic on the enhanced Ca^2＋ responses to the TRPV4 phorbol ester agonist 4a-phorbo112, 13-didecanoate and hypotonic solutions. These findings demonstrate that sustained mechanical compressive loading in vitro increases the expression of TRPV4 mRNA and protein in DRG neurons and sensitizes TRPV4 Ca^2＋ signals. Mechanical compression does not impact other ion channels in the transient receptor potential family.
基金Supported by Grants from the University of Toyama and JSPS KAKENHI to Mihara H,No.26870214
文摘AIM: To explore the expression of transient receptor potential vanilloid 4(TRPV4) and its physiological meaning in mouse and rat gastric epithelia. METHODS: RT-PCR and immunochemistry were used to detect TRPV4 m RNA and protein expression in mouse stomach and a rat normal gastric epithelial cell line(RGE1-01), while Ca2+-imaging and electrophysiology were used to evaluate TRPV4 channel activity. ATP release was measured by a luciferin-luciferase assay. Gastric emptying was also compared between WT and TRPV4 knockout mice. RESULTS: TRPV4 m RNA and protein were detected in mouse tissues and RGE1-01 cells. A TRPV4-specific agonist(GSK1016790A) increased intracellular Ca2+ concentrations and/or evoked TRPV4-like current activities in WT mouse gastric epithelial cells andRGE1-01 cells, but not TRPV4 KO cells. GSK1016790 A or mechanical stimuli induced ATP release from RGE1-01 cells while TRPV4 knockout mice displayed delayed gastric emptying in vivo. CONCLUSION: TRPV4 is expressed in mouse and rat gastric epithelium and contributes to ATP release and gastric emptying.
文摘目的:探讨大鼠背根神经节慢性压迫CCD后瞬时感受器电位离子通道香草素受体4(TRPV4)下游信号分子及其在痛觉过敏中的机制。方法:鞘内分别注射TRPV4拮抗剂钌红(RR)、TRPV4反义寡脱氧核苷酸(ASODN)和一氧化氮合成酶(NOS)抑制剂L-NAME,检测CCD大鼠背根神经节DRG内一氧化氮(NO)代谢产物亚硝酸盐(nitrite)含量变化,并观测热刺激缩爪反应潜伏期(PWL)的变化。结果:鞘内分别注射RR、TRPV4 AS ODN和L-NAME后,均能够显著降低CCD大鼠DRG内亚硝酸盐含量(P<0.05),CCD大鼠的热痛敏行为也能够显著改善(P<0.05)。结论:TRPV4及其下游信号分子NO参与介导CCD大鼠的热痛觉过敏。
文摘目的评价甲泼尼龙对呼吸机相关性肺损伤(VILI)大鼠肺组织瞬时受体电位香草酸4 (TRPV4)/基质金属蛋白酶2/9(MMP-2/MMP-9)信号通路的影响。方法清洁级雄性SD大鼠100只,采用随机数字表法分为5组(n=20):对照组(C组)、机械通气组(V组)、甲泼尼龙组(Mp组)、甲泼尼龙+GSK1016790A组(MpG组)、HC-067047组(H组)。C组不行机械通气,自主呼吸空气4 h;V组机械通气(RR 40次/min,VT 40 m L/kg,I∶E 1∶1,PEEP 0,Fi O221%) 4 h;Mp组在机械通气前20 min静脉输注甲泼尼龙10.0 mg/kg;MpG组在给予甲泼尼龙前20 min静脉输注GSK1016790A 0.025 mg/kg;H组机械通气前30 min静脉输注HC-067047 10.0 mg/kg。机械通气4 h时,检测支气管肺泡灌洗液(BALF)中白细胞介素-1(IL-1)、肿瘤坏死因子-α(TNF-α)、总蛋白浓度,测定肺通透指数(LPI)、肺湿/干质量比(W/D),观察肺组织病理学结果。Western blot法检测肺组织TRPV4、MMP-2、MMP-9的表达水平。结果与C组比较,V组和MpG组BALF中IL-1(ng/m L:84.56±5.35 vs. 144.85±9.39、121.56±7.69)、TNF-α(ng/m L:179.65±45.73 vs. 486.18±94.79、316.93±69.71)、总蛋白(mg/m L:321.29±28.76 vs. 687.78±65.78、476.39±46.67)升高,肺组织LPI [(2.47±0.17)×10^(-3)vs.(6.19±0.29)×10^(-3)、(4.24±0.25)×10^(-3)]、W/D比值(4.42±0.19 vs. 8.83±0.61、6.32±0.41)升高,TRPV4(1.85±0.25 vs.5.81±0.92、3.87±0.65)、MMP-2 (0.44±0.06 vs. 1.16±0.23、0.85±0.11)、MMP-9(0.19±0.03 vs. 0.46±0.09、0.34±0.07)表达上调(P<0.05);与V组比较,Mp组、MpG组和H组BALF中IL-1(ng/m L:144.85±9.39 vs. 89.78±5.91、121.56±7.69、94.23±6.78)、TNF-α(ng/m L:486.18±94.79 vs. 186.42±49.37、316.93±69.71、193.71±51.41)、总蛋白(mg/m L:687.78±65.78 vs. 348.78±31.52、476.39±46.67、359.68±36.12)降低,肺组织LPI [(6.19±0.29)×10^(-3)vs.(2.85±0.14)×10^(-3)、(4.24±0.25)×10^(-3)、(2.97±0.21)×10^(-3)]、W/D比值(8.83±0.61 vs. 4.75±0.22、6.32±0.41、4.82±0.25)降低,TRPV4(5.81±0.92 vs. 2.13±0.29、3.87±0.65、2.35±0.37)、MMP-2 (1.16±0.23 vs. 0.48±0.08、0.85±0.11、0.52±0.08)、MMP-9(0.46±0.09 vs. 0.22±0.04、0.34±0.07、0.25±0.05)表达下调(P<0.05),肺组织病理损伤减轻;与Mp组比较,MpG组BALF中IL-1 (ng/m L:89.78±5.91 vs. 121.56±7.69)、TNF-α(ng/m L:186.42±49.37 vs. 316.93±69.71)、总蛋白(mg/m L:348.78±31.52 vs. 476.39±46.67)升高,肺组织LPI [(2.85±0.14)×10^(-3)vs.(4.24±0.25)×10^(-3)]、W/D比值(4.75±0.22 vs. 6.32±0.41)升高,TRPV4(2.13±0.29 vs. 3.87±0.65)、MMP-2(0.48±0.08 vs. 0.85±0.11)、MMP-9(0.22±0.04 vs. 0.34±0.07)表达上调(P<0.05)。结论甲泼尼龙可减轻大鼠VILI,与其抑制TRPV4/MMP-2/MMP-9信号通路有关。
文摘目的:通过检测LTB4、TRPV1及CGRP等指标的变化,分析LTB4-TRPV1信号活化在急性胆源性胰腺炎中的作用。方法:取清洁级SD大鼠60只,随机分为正常组、模型组和TRPV1拮抗剂组。采用胆胰管开口十二指肠结扎法制备重症胰腺炎模型,术后3 h,除正常组外,其余两组开始分组给药,术后12 h,处死全部大鼠,腹主动脉取血并收集胰腺组织备测。用光镜检测胰腺组织超微结构变化,用ELISA技术检测LTB4变化,用Real-time PCR技术检测TRPV1、CGRP变化。结果:正常组胰腺呈浅粉红色;模型组见胰腺坏死、出血,部分可见腹水,腹水含血,光镜下见胰腺腺体结构紊乱,小叶间隔明显增大,腺体实质内可见大片凝固性坏死并伴有出血,坏死灶及周围有大量炎细胞浸润;TRPV1拮抗剂组胰腺组织充血水肿较模型组减轻,未见腹水,光镜下胰腺实质可见少许坏死、出血及少量炎性细胞浸润,其组织病理学评分较模型组下降,有统计学意义,P<0.05。模型组见血淀粉酶、LTB4表达明显上升;TRPV1拮抗剂组血淀粉酶、LTB4表达亦增高但低于模型组,较模型组有统计学意义,P<0.05;模型组胰腺组织TRPV1、CGRP m RNA表达上升;TRPV1拮抗剂组TRPV1、CGRP m RNA表达亦增高但低于模型组,与模型组比较有统计学意义,P<0.05。结论:内源性LTB4活化TRPV1信号在胆道梗阻性胰腺炎中可能发挥至关重要的作用,阻断TRPV1信号转导将为急性胰腺炎的治疗提供新的思路。
