Vincristine,a widely used chemotherapeutic agent for treating different cancer,often induces severe peripheral neuropathic pain.A common symptom of vincristine-induced peripheral neuropathic pain is mechanical allodyn...Vincristine,a widely used chemotherapeutic agent for treating different cancer,often induces severe peripheral neuropathic pain.A common symptom of vincristine-induced peripheral neuropathic pain is mechanical allodynia and hyperalgesia.However,mechanisms underlying vincristine-induced mechanical allodynia and hyperalgesia are not well understood.In the present study,we show with behavioral assessment in rats that vincristine induces mechanical allodynia and hyperalgesia in a PIEZO2 channel-dependent manner since gene knockdown or pharmacological inhibition of PIEZO2 channels alleviates vincristine-induced mechanical hypersensitivity.Electrophysiological results show that vincristine potentiates PIEZO2 rapidly adapting(RA)mechanically-activated(MA)currents in rat dorsal root ganglion(DRG)neurons.We have found that vincristine-induced potentiation of PIEZO2 MA currents is due to the enhancement of static plasma membrane tension(SPMT)of these cells following vincristine treatment.Reducing SPMT of DRG neurons by cytochalasin D(CD),a disruptor of the actin filament,abolishes vincristine-induced potentiation of PIEZO2 MA currents,and suppresses vincristine-induced mechanical hypersensitivity in rats.Collectively,enhancing SPMT and subsequently potentiating PIEZO2 MA currents in primary afferent neurons may be an underlying mechanism responsible for vincristineinduced mechanical allodynia and hyperalgesia in rats.Targeting to inhibit PIEZO2 channels may be an effective analgesic method to attenuate vincristine-induced mechanical hypersensitivity.展开更多
Piezo1 is a mechanically-gated calcium channel.Recent studies have shown that Piezo1,a mechanically-gated calcium channel,can attenuate both psychosineand lipopolysaccharide-induced demyelination.Because oligodendrocy...Piezo1 is a mechanically-gated calcium channel.Recent studies have shown that Piezo1,a mechanically-gated calcium channel,can attenuate both psychosineand lipopolysaccharide-induced demyelination.Because oligodendrocyte damage and demyelination occur in intracerebral hemorrhage,in this study,we investigated the role of Piezo1 in intracerebral hemorrhage.We established a mouse model of cerebral hemorrhage by injecting autologous blood into the right basal ganglia and found that Piezo1 was largely expressed soon(within 48 hours)after intracerebral hemorrhage,primarily in oligodendrocytes.Intraperitoneal injection of Dooku1 to inhibit Piezo1 resulted in marked alleviation of brain edema,myelin sheath loss,and degeneration in injured tissue,a substantial reduction in oligodendrocyte apoptosis,and a significant improvement in neurological function.In addition,we found that Dooku1-mediated Piezo1 suppression reduced intracellular endoplasmic reticulum stress and cell apoptosis through the PERK-ATF4-CHOP and inositol-requiring enzyme 1 signaling pathway.These findings suggest that Piezo1 is a potential therapeutic target for intracerebral hemorrhage,as its suppression reduces intracellular endoplasmic reticulum stress and cell apoptosis and protects the myelin sheath,thereby improving neuronal function after intracerebral hemorrhage.展开更多
目的观察推拿㨰法对骨骼肌损伤模型大鼠的机械敏感性离子通道Piezo1及细胞凋亡的影响,探讨推拿㨰法治疗骨骼肌损伤的作用机制。方法32只SD大鼠随机分成正常组、模型组、㨰法组、㨰法+抑制剂组,每组8只。采用肌内注射200μL虎蛇毒素(notexin,...目的观察推拿㨰法对骨骼肌损伤模型大鼠的机械敏感性离子通道Piezo1及细胞凋亡的影响,探讨推拿㨰法治疗骨骼肌损伤的作用机制。方法32只SD大鼠随机分成正常组、模型组、㨰法组、㨰法+抑制剂组,每组8只。采用肌内注射200μL虎蛇毒素(notexin,NTX)(10μg/mL)制备大鼠腓肠肌损伤模型。造模24 h后,㨰法组使用实验动物㨰法器模拟㨰法治疗,滚动频率为140次/min,每天2次,每次3 min,连续治疗3 d;㨰法+抑制剂组在实施㨰法治疗前,给予腹腔注射Piezo1抑制剂GsMTx4(270μg/kg),每天1次,连续注射3 d;正常组和模型组腹腔注射等体积生理盐水。采用平衡木测试进行行为学评估,HE染色观察腓肠肌组织显微结构变化,TUNEL染色计算腓肠肌组织细胞凋亡率,Western blot法检测大鼠腓肠肌组织Piezo1、B淋巴细胞瘤-2(B-lymphoma-2,Bcl-2)、B淋巴细胞瘤2相关X蛋白质(B-lymphoma-2 related X protein,Bax)、胱天蛋白酶-3(cysteine aspartic acid specific protease-3,Caspase-3)表达。结果与正常组比较,模型组和㨰法+抑制剂组平衡木行走时间延长(P<0.01),滑爪次数增加(P<0.01),腓肠肌细胞凋亡率升高(P<0.01),腓肠肌组织Piezo1、Bcl-2蛋白表达降低(P<0.01),Bax、Caspase-3蛋白表达升高(P<0.05),肌细胞破裂、坏死、大小不一,排列稀疏、无规律,周围有大量中性粒细胞和淋巴细胞浸润。与模型组比较,㨰法组平衡木行走时间缩短(P<0.01),滑爪次数减少(P<0.01),腓肠肌细胞凋亡率降低(P<0.01),腓肠肌组织Piezo1、Bcl-2蛋白表达升高(P<0.01),Bax、Caspase-3蛋白表达降低(P<0.05),肌细胞病理情况好转,有少量细胞破裂、萎缩、坏死,细胞间隔缩小,轻度局灶性炎性细胞浸润。与㨰法组比较,㨰法+抑制剂组平衡木行走时间延长(P<0.01),滑爪次数增多(P<0.01),腓肠肌细胞凋亡率增高(P<0.01),腓肠肌组织Piezo1蛋白表达降低(P<0.05),Caspase-3蛋白表达升高(P<0.01),见较多肌细胞萎缩、坏死、大小不一,排列间隔较大,周围仍有一定数量中性粒细胞和淋巴细胞浸润。结论推拿㨰法可促进骨骼肌运动功能恢复,缓解骨骼肌损伤,其作用机制可能与激活Piezo1,抑制细胞凋亡有关。展开更多
基金supported by NSFC grant 81571080(Zhanfeng Jia,China),81872848(Wei Zhang,China)the Central Government Guiding Local Funding Project for Scientific and Technological Development 206Z7703G(Zhanfeng Jia,China)+2 种基金Key Project and Cultivation Project of Precision Medicine Joint Fund of Natural Science Foundation of Hebei Province H2021206406(Zhanfeng Jia,China),H2022206211(Wei Zhang,China)and H2020206165(Zhanfeng Jia,China)Science and Technology Project of Hebei Education Department ZD2020107(Zhanfeng Jia,China)Science Fund for Creative Research Groups of Natural Science Foundation of Hebei Province H2020206474,China.
文摘Vincristine,a widely used chemotherapeutic agent for treating different cancer,often induces severe peripheral neuropathic pain.A common symptom of vincristine-induced peripheral neuropathic pain is mechanical allodynia and hyperalgesia.However,mechanisms underlying vincristine-induced mechanical allodynia and hyperalgesia are not well understood.In the present study,we show with behavioral assessment in rats that vincristine induces mechanical allodynia and hyperalgesia in a PIEZO2 channel-dependent manner since gene knockdown or pharmacological inhibition of PIEZO2 channels alleviates vincristine-induced mechanical hypersensitivity.Electrophysiological results show that vincristine potentiates PIEZO2 rapidly adapting(RA)mechanically-activated(MA)currents in rat dorsal root ganglion(DRG)neurons.We have found that vincristine-induced potentiation of PIEZO2 MA currents is due to the enhancement of static plasma membrane tension(SPMT)of these cells following vincristine treatment.Reducing SPMT of DRG neurons by cytochalasin D(CD),a disruptor of the actin filament,abolishes vincristine-induced potentiation of PIEZO2 MA currents,and suppresses vincristine-induced mechanical hypersensitivity in rats.Collectively,enhancing SPMT and subsequently potentiating PIEZO2 MA currents in primary afferent neurons may be an underlying mechanism responsible for vincristineinduced mechanical allodynia and hyperalgesia in rats.Targeting to inhibit PIEZO2 channels may be an effective analgesic method to attenuate vincristine-induced mechanical hypersensitivity.
基金supported by the National Natural Science Foundation of China,Nos.81901193(to HLZ)and 81901267(to YY)。
文摘Piezo1 is a mechanically-gated calcium channel.Recent studies have shown that Piezo1,a mechanically-gated calcium channel,can attenuate both psychosineand lipopolysaccharide-induced demyelination.Because oligodendrocyte damage and demyelination occur in intracerebral hemorrhage,in this study,we investigated the role of Piezo1 in intracerebral hemorrhage.We established a mouse model of cerebral hemorrhage by injecting autologous blood into the right basal ganglia and found that Piezo1 was largely expressed soon(within 48 hours)after intracerebral hemorrhage,primarily in oligodendrocytes.Intraperitoneal injection of Dooku1 to inhibit Piezo1 resulted in marked alleviation of brain edema,myelin sheath loss,and degeneration in injured tissue,a substantial reduction in oligodendrocyte apoptosis,and a significant improvement in neurological function.In addition,we found that Dooku1-mediated Piezo1 suppression reduced intracellular endoplasmic reticulum stress and cell apoptosis through the PERK-ATF4-CHOP and inositol-requiring enzyme 1 signaling pathway.These findings suggest that Piezo1 is a potential therapeutic target for intracerebral hemorrhage,as its suppression reduces intracellular endoplasmic reticulum stress and cell apoptosis and protects the myelin sheath,thereby improving neuronal function after intracerebral hemorrhage.
文摘目的观察推拿㨰法对骨骼肌损伤模型大鼠的机械敏感性离子通道Piezo1及细胞凋亡的影响,探讨推拿㨰法治疗骨骼肌损伤的作用机制。方法32只SD大鼠随机分成正常组、模型组、㨰法组、㨰法+抑制剂组,每组8只。采用肌内注射200μL虎蛇毒素(notexin,NTX)(10μg/mL)制备大鼠腓肠肌损伤模型。造模24 h后,㨰法组使用实验动物㨰法器模拟㨰法治疗,滚动频率为140次/min,每天2次,每次3 min,连续治疗3 d;㨰法+抑制剂组在实施㨰法治疗前,给予腹腔注射Piezo1抑制剂GsMTx4(270μg/kg),每天1次,连续注射3 d;正常组和模型组腹腔注射等体积生理盐水。采用平衡木测试进行行为学评估,HE染色观察腓肠肌组织显微结构变化,TUNEL染色计算腓肠肌组织细胞凋亡率,Western blot法检测大鼠腓肠肌组织Piezo1、B淋巴细胞瘤-2(B-lymphoma-2,Bcl-2)、B淋巴细胞瘤2相关X蛋白质(B-lymphoma-2 related X protein,Bax)、胱天蛋白酶-3(cysteine aspartic acid specific protease-3,Caspase-3)表达。结果与正常组比较,模型组和㨰法+抑制剂组平衡木行走时间延长(P<0.01),滑爪次数增加(P<0.01),腓肠肌细胞凋亡率升高(P<0.01),腓肠肌组织Piezo1、Bcl-2蛋白表达降低(P<0.01),Bax、Caspase-3蛋白表达升高(P<0.05),肌细胞破裂、坏死、大小不一,排列稀疏、无规律,周围有大量中性粒细胞和淋巴细胞浸润。与模型组比较,㨰法组平衡木行走时间缩短(P<0.01),滑爪次数减少(P<0.01),腓肠肌细胞凋亡率降低(P<0.01),腓肠肌组织Piezo1、Bcl-2蛋白表达升高(P<0.01),Bax、Caspase-3蛋白表达降低(P<0.05),肌细胞病理情况好转,有少量细胞破裂、萎缩、坏死,细胞间隔缩小,轻度局灶性炎性细胞浸润。与㨰法组比较,㨰法+抑制剂组平衡木行走时间延长(P<0.01),滑爪次数增多(P<0.01),腓肠肌细胞凋亡率增高(P<0.01),腓肠肌组织Piezo1蛋白表达降低(P<0.05),Caspase-3蛋白表达升高(P<0.01),见较多肌细胞萎缩、坏死、大小不一,排列间隔较大,周围仍有一定数量中性粒细胞和淋巴细胞浸润。结论推拿㨰法可促进骨骼肌运动功能恢复,缓解骨骼肌损伤,其作用机制可能与激活Piezo1,抑制细胞凋亡有关。
