The nervous system function requires a precise but plastic neural architecture.The neuronal shape dictates how neurons interact with each other and with other cells,being the morphology of dendrites and axons the cent...The nervous system function requires a precise but plastic neural architecture.The neuronal shape dictates how neurons interact with each other and with other cells,being the morphology of dendrites and axons the central determinant of the functional properties of neurons and neural circuits.The topological and structural morphology of axons and dendrites defines and determines how synapses are conformed.The morphological diversity of axon and dendrite arborization governs the neuron’s inputs,synaptic integration,neuronal computation,signal transmission,and network circuitry,hence defining the particular connectivity and function of the different brain areas.展开更多
Neuropathic pain,often featuring allodynia,imposes significant physical and psychological burdens on patients,with limited treatments due to unclear central mechanisms.Addressing this challenge remains a crucial unsol...Neuropathic pain,often featuring allodynia,imposes significant physical and psychological burdens on patients,with limited treatments due to unclear central mechanisms.Addressing this challenge remains a crucial unsolved issue in pain medicine.Our previous study,using protein kinase C gamma(PKCγ)-tdTomato mice,highlights the spinal feedforward inhibitory circuit involving PKCγ neurons in gating neuropathic allodynia.However,the regulatory mechanisms governing this circuit necessitate further elucidation.We used diverse transgenic mice and advanced techniques to uncover the regulatory role of the descending serotonin(5-HT)facilitation system on spinal PKCγ neurons.Our findings revealed that 5-HT neurons from the rostral ventromedial medulla hyperpolarize spinal inhibitory interneurons via 5-HT_(2C) receptors,disinhibiting the feedforward inhibitory circuit involving PKCγ neurons and exacerbating allodynia.Inhibiting spinal 5-HT_(2C) receptors restored the feedforward inhibitory circuit,effectively preventing neuropathic allodynia.These insights offer promising therapeutic targets for neuropathic allodynia management,emphasizing the potential of spinal 5-HT_(2C) receptors as a novel avenue for intervention.展开更多
目的:基于食欲素受体1(OX1R)/磷脂酰肌醇特异性磷酯酶Cβ-1(PLCβ-1)/蛋白激酶Cα(PKCα)/细胞外信号调节激酶1/2(ERK1/2)信号通路探讨安寐丹对失眠大鼠肝脏神经递质及昼夜节律的影响及机制。方法:SPF级SD大鼠60只,随机分为空白组、模...目的:基于食欲素受体1(OX1R)/磷脂酰肌醇特异性磷酯酶Cβ-1(PLCβ-1)/蛋白激酶Cα(PKCα)/细胞外信号调节激酶1/2(ERK1/2)信号通路探讨安寐丹对失眠大鼠肝脏神经递质及昼夜节律的影响及机制。方法:SPF级SD大鼠60只,随机分为空白组、模型组、苏沃雷生组、安寐丹低、中、高剂量组,各10只;除空白组外,其余各组通过腹腔注射对氯苯丙氨酸(PCPA)进行造模,空白组给予等容生理盐水、苏沃雷生组给予苏沃雷生溶液30 mg·kg^(-1)·d^(-1)灌胃、安寐丹低、中、高剂量组分别给予安寐丹水煎液(4.55、9.09、18.18 g·kg^(-1)·d^(-1));观察各组一般情况、体质量和24 h自主活动情况;采用苏木素-伊红(HE)和马松(Masson)染色观察肝脏病理学改变,酶联免疫吸附测定法(ELISA)检测肝脏神经递质γ-氨基丁酸(GABA)、5-羟色胺(5-HT)、肾上腺素(EPI)、去甲肾上腺素(NE)和乙酰胆碱(ACh)的表达,生化检测肝脏谷氨酸(Glu)的表达,实时荧光定量聚合酶链式反应(Real-time PCR)检测肝脏生物钟基因Per1、Per2、Cry1、Cry2、Bmal1、Bmal2的m RNA表达,蛋白免疫印迹法(Western blot)、Real-time PCR检测肝脏OX1R/PLCβ-1/PKCα/ERK1/2信号通路蛋白及m RNA表达。结果:与空白组比较,模型组体质量下降(P<0.05,P<0.01),狂躁、静止节律紊乱(P<0.01),肝脏肌纤维断裂、水肿伴炎性细胞浸润,GABA、5-HT、EPI、NE和ACh含量降低、Glu含量升高(P<0.01),Per1、Per2、Cry1和Cry2 m RNA表达降低(P<0.01),Bmal1和Bmal2 m RNA表达升高(P<0.01),OX1R、PLCβ-1、PKCα、ERK1/2蛋白及m RNA基因表达均增高(P<0.01);与模型组比较,苏沃雷生和安寐丹低、中、高剂量组可增加失眠大鼠体质量(P<0.05,P<0.01),减少狂躁状态、增加其静止时间和频率(P<0.05,P<0.01),并可上调神经递质GABA、5-HT、EPI、NE、ACh和节律基因Per1、Per2、Cry1、Cry2 m RNA表达(P<0.05,P<0.01),抑制Glu及Bmal1、Bmal2、OX1R、PLCβ-1、PKCα、ERK1/2 m RNA和OX1R、PLCβ-1、PKCα、ERK1/2蛋白表达(P<0.05,P<0.01)。结论:安寐丹可通过抑制OX1R/PLCβ-1/PKCα/ERK1/2信号通路调节失眠大鼠肝脏神经递质表达,改善昼夜节律紊乱,且安寐丹高剂量组效果最佳。展开更多
基金supported by the Wellcome Trust(grant No.103852).
文摘The nervous system function requires a precise but plastic neural architecture.The neuronal shape dictates how neurons interact with each other and with other cells,being the morphology of dendrites and axons the central determinant of the functional properties of neurons and neural circuits.The topological and structural morphology of axons and dendrites defines and determines how synapses are conformed.The morphological diversity of axon and dendrite arborization governs the neuron’s inputs,synaptic integration,neuronal computation,signal transmission,and network circuitry,hence defining the particular connectivity and function of the different brain areas.
基金supported by the National Natural Science Foundation of China(81971058,82371226,82101295,82301398)the National Funded Postdoctoral Researcher Program(GZC20233585)The Boost Plan of Xijing Hospital(XJZT24QN25,XJZT25CX22).
文摘Neuropathic pain,often featuring allodynia,imposes significant physical and psychological burdens on patients,with limited treatments due to unclear central mechanisms.Addressing this challenge remains a crucial unsolved issue in pain medicine.Our previous study,using protein kinase C gamma(PKCγ)-tdTomato mice,highlights the spinal feedforward inhibitory circuit involving PKCγ neurons in gating neuropathic allodynia.However,the regulatory mechanisms governing this circuit necessitate further elucidation.We used diverse transgenic mice and advanced techniques to uncover the regulatory role of the descending serotonin(5-HT)facilitation system on spinal PKCγ neurons.Our findings revealed that 5-HT neurons from the rostral ventromedial medulla hyperpolarize spinal inhibitory interneurons via 5-HT_(2C) receptors,disinhibiting the feedforward inhibitory circuit involving PKCγ neurons and exacerbating allodynia.Inhibiting spinal 5-HT_(2C) receptors restored the feedforward inhibitory circuit,effectively preventing neuropathic allodynia.These insights offer promising therapeutic targets for neuropathic allodynia management,emphasizing the potential of spinal 5-HT_(2C) receptors as a novel avenue for intervention.
文摘目的:基于食欲素受体1(OX1R)/磷脂酰肌醇特异性磷酯酶Cβ-1(PLCβ-1)/蛋白激酶Cα(PKCα)/细胞外信号调节激酶1/2(ERK1/2)信号通路探讨安寐丹对失眠大鼠肝脏神经递质及昼夜节律的影响及机制。方法:SPF级SD大鼠60只,随机分为空白组、模型组、苏沃雷生组、安寐丹低、中、高剂量组,各10只;除空白组外,其余各组通过腹腔注射对氯苯丙氨酸(PCPA)进行造模,空白组给予等容生理盐水、苏沃雷生组给予苏沃雷生溶液30 mg·kg^(-1)·d^(-1)灌胃、安寐丹低、中、高剂量组分别给予安寐丹水煎液(4.55、9.09、18.18 g·kg^(-1)·d^(-1));观察各组一般情况、体质量和24 h自主活动情况;采用苏木素-伊红(HE)和马松(Masson)染色观察肝脏病理学改变,酶联免疫吸附测定法(ELISA)检测肝脏神经递质γ-氨基丁酸(GABA)、5-羟色胺(5-HT)、肾上腺素(EPI)、去甲肾上腺素(NE)和乙酰胆碱(ACh)的表达,生化检测肝脏谷氨酸(Glu)的表达,实时荧光定量聚合酶链式反应(Real-time PCR)检测肝脏生物钟基因Per1、Per2、Cry1、Cry2、Bmal1、Bmal2的m RNA表达,蛋白免疫印迹法(Western blot)、Real-time PCR检测肝脏OX1R/PLCβ-1/PKCα/ERK1/2信号通路蛋白及m RNA表达。结果:与空白组比较,模型组体质量下降(P<0.05,P<0.01),狂躁、静止节律紊乱(P<0.01),肝脏肌纤维断裂、水肿伴炎性细胞浸润,GABA、5-HT、EPI、NE和ACh含量降低、Glu含量升高(P<0.01),Per1、Per2、Cry1和Cry2 m RNA表达降低(P<0.01),Bmal1和Bmal2 m RNA表达升高(P<0.01),OX1R、PLCβ-1、PKCα、ERK1/2蛋白及m RNA基因表达均增高(P<0.01);与模型组比较,苏沃雷生和安寐丹低、中、高剂量组可增加失眠大鼠体质量(P<0.05,P<0.01),减少狂躁状态、增加其静止时间和频率(P<0.05,P<0.01),并可上调神经递质GABA、5-HT、EPI、NE、ACh和节律基因Per1、Per2、Cry1、Cry2 m RNA表达(P<0.05,P<0.01),抑制Glu及Bmal1、Bmal2、OX1R、PLCβ-1、PKCα、ERK1/2 m RNA和OX1R、PLCβ-1、PKCα、ERK1/2蛋白表达(P<0.05,P<0.01)。结论:安寐丹可通过抑制OX1R/PLCβ-1/PKCα/ERK1/2信号通路调节失眠大鼠肝脏神经递质表达,改善昼夜节律紊乱,且安寐丹高剂量组效果最佳。
