目的观察电针对骶上脊髓损伤后尿潴留型神经源性膀胱大鼠排尿功能的影响,并探讨电针调节嘌呤能离子通道型受体7(purinergic ligand-gated ion channel 7 receptor,P2X7R)介导的细胞焦亡途径在其中的潜在效应机制。方法从48只雌性SD大鼠...目的观察电针对骶上脊髓损伤后尿潴留型神经源性膀胱大鼠排尿功能的影响,并探讨电针调节嘌呤能离子通道型受体7(purinergic ligand-gated ion channel 7 receptor,P2X7R)介导的细胞焦亡途径在其中的潜在效应机制。方法从48只雌性SD大鼠中随机抽取12只纳入假手术组,剩余大鼠以T8完全性脊髓横断法建立尿潴留型神经源性膀胱大鼠模型,将已成模的27只大鼠二次随机分为模型组与电针组,每组12只,剩余3只模型大鼠用于实验候补。电针组于术后第19天开始干预,连续10 d,其余两组仅予以捆绑。干预结束后,各组大鼠先行尿流动力学检测,随后快速分离膀胱组织待检,应用HE染色观察膀胱组织形态学变化,透射电镜观察膀胱组织超微结构变化,TUNEL染色检测膀胱组织中细胞损伤情况,ELISA检测膀胱组织中三磷酸腺苷(adenosine triphosphate,ATP)水平,免疫组织化学法和Western blot法检测膀胱组织中P2X7R、NOD样受体热蛋白结构域相关蛋白3(NODlike receptor thermal protein domain associated protein 3,NLRP3)、半胱氨酸天冬氨酸蛋白酶-1(cysteinyl aspartate specific proteinase-1,Caspase-1)、白细胞介素-1β(interleukin-1β,IL-1β)蛋白表达情况。结果与假手术组比较,模型组大鼠膀胱漏尿点压力、膀胱最大压力、膀胱最大容量显著升高(P<0.01),以膀胱体积增大伴尿潴留为主要表现;模型组大鼠膀胱组织存在明显的炎性反应且病理改变显著,膀胱组织超微结构可见明显肿胀、变形等细胞损伤,膀胱组织细胞损伤率显著增加(P<0.01),膀胱组织中ATP含量、P2X7R、NLRP3、Caspase-1、IL-1β的阳性表达及蛋白表达水平均显著升高(P<0.01)。与模型组比较,电针组大鼠膀胱漏尿点压力、膀胱最大压力、膀胱最大容量降低(P<0.05),尿潴留症状较轻,膀胱排尿功能改善;电针组大鼠膀胱组织的炎性反应及病理损伤减轻,膀胱组织超微结构变化明显改善,膀胱组织细胞损伤率显著减少(P<0.01),膀胱组织中ATP含量、P2X7R、NLRP3、Caspase-1、IL-1β的阳性表达及蛋白表达水平均显著降低(P<0.01)。结论电针可有效改善骶上脊髓损伤后尿潴留型神经源性膀胱大鼠的膀胱排尿功能,缓解尿潴留症状,减轻膀胱组织病理损伤程度及其炎症反应,其机制与抑制膀胱组织中P2X7R/NLRP3信号通路焦亡蛋白的表达有关。展开更多
Cholesterol is a major lipid in biological membranes.It not only plays a structural role but also modulates a wide range of functional properties of neurotransmitter and hormone receptors and ion channels.The membrane...Cholesterol is a major lipid in biological membranes.It not only plays a structural role but also modulates a wide range of functional properties of neurotransmitter and hormone receptors and ion channels.The membraneembedded segments of the paradigm neurotransmitter receptor for acetylcholine(nAChR)contain linear sequences of amino acids with the capacity to recognize cholesterol.These cholesterol consensus domains have been designated as“CARC”and its mirror sequence“CRAC”.CARC preferentially occurs in the exoplasmic-facing membrane leaflet,and CRAC,in the cytoplasmic-facing hemilayer.Both motifs are highly conserved among ion-channel and neurotransmitter receptor proteins in vertebrate nervous systems,where they recognize cholesterol,and in prokaryotic homologues in bacteria,where they recognize hopanoids.This phylogenetically conserved trait is an indication that the hopanoids in some bacteria and cholesterol in eukaryotes subserve analogous functions,probably contributing to the stability of membrane-embedded protein domains.Structural studies from our laboratory using superresolution optical microscopy(“nanoscopy”)have disclosed other interrelated functional and structural properties exerted by cholesterol on the nAChR.The neutral lipid content at the cell surface influences both the macromolecular organization of the receptor and its translational mobility(diffusion)in the plane of the membrane.展开更多
文摘目的观察电针对骶上脊髓损伤后尿潴留型神经源性膀胱大鼠排尿功能的影响,并探讨电针调节嘌呤能离子通道型受体7(purinergic ligand-gated ion channel 7 receptor,P2X7R)介导的细胞焦亡途径在其中的潜在效应机制。方法从48只雌性SD大鼠中随机抽取12只纳入假手术组,剩余大鼠以T8完全性脊髓横断法建立尿潴留型神经源性膀胱大鼠模型,将已成模的27只大鼠二次随机分为模型组与电针组,每组12只,剩余3只模型大鼠用于实验候补。电针组于术后第19天开始干预,连续10 d,其余两组仅予以捆绑。干预结束后,各组大鼠先行尿流动力学检测,随后快速分离膀胱组织待检,应用HE染色观察膀胱组织形态学变化,透射电镜观察膀胱组织超微结构变化,TUNEL染色检测膀胱组织中细胞损伤情况,ELISA检测膀胱组织中三磷酸腺苷(adenosine triphosphate,ATP)水平,免疫组织化学法和Western blot法检测膀胱组织中P2X7R、NOD样受体热蛋白结构域相关蛋白3(NODlike receptor thermal protein domain associated protein 3,NLRP3)、半胱氨酸天冬氨酸蛋白酶-1(cysteinyl aspartate specific proteinase-1,Caspase-1)、白细胞介素-1β(interleukin-1β,IL-1β)蛋白表达情况。结果与假手术组比较,模型组大鼠膀胱漏尿点压力、膀胱最大压力、膀胱最大容量显著升高(P<0.01),以膀胱体积增大伴尿潴留为主要表现;模型组大鼠膀胱组织存在明显的炎性反应且病理改变显著,膀胱组织超微结构可见明显肿胀、变形等细胞损伤,膀胱组织细胞损伤率显著增加(P<0.01),膀胱组织中ATP含量、P2X7R、NLRP3、Caspase-1、IL-1β的阳性表达及蛋白表达水平均显著升高(P<0.01)。与模型组比较,电针组大鼠膀胱漏尿点压力、膀胱最大压力、膀胱最大容量降低(P<0.05),尿潴留症状较轻,膀胱排尿功能改善;电针组大鼠膀胱组织的炎性反应及病理损伤减轻,膀胱组织超微结构变化明显改善,膀胱组织细胞损伤率显著减少(P<0.01),膀胱组织中ATP含量、P2X7R、NLRP3、Caspase-1、IL-1β的阳性表达及蛋白表达水平均显著降低(P<0.01)。结论电针可有效改善骶上脊髓损伤后尿潴留型神经源性膀胱大鼠的膀胱排尿功能,缓解尿潴留症状,减轻膀胱组织病理损伤程度及其炎症反应,其机制与抑制膀胱组织中P2X7R/NLRP3信号通路焦亡蛋白的表达有关。
文摘目的探究血清嘌呤能离子通道型受体7(purinergic ligand-gated ion channel 7 receptor,P2X7R)、结缔组织生长因子(connective tissue growth factor,CTGF)表达与精神分裂症患者认知功能、临床症状的相关性。方法选取2021年1月~2023年1月在武汉市武东医院精神重症一科诊治的160例精神分裂症患者作为观察组,及同期160例健康体检志愿者作为对照组进行研究。根据阳性和阴性症状量表(positive and negative syndrome scale,PANSS)对患者精神临床症状(阳性和阴性症状、一般病理症状、附加症状)进行评估,将患者分为高分组(PANSS总分≥70分,n=72)和低分组(PANSS总分<70分,n=88)。利用精神分裂症认知功能成套测验共识版(MATRICS consensus cognitive battery,MCCB)评估患者认知能力;采用酶联免疫吸附测定(ELISA)法检测血清P2X7R和CTGF水平;Spearman法分析精神分裂症患者血清P2X7R和CTGF水平与PANSS各项评分、MCCB各项评分的相关性。结果与对照组相比,观察组血清P2X7R(610.71±107.83ng/L vs 384.78±80.62ng/L),CTGF水平(1.85±0.36μg/L vs 1.40±0.21μg/L)升高,差异有统计学意义(t=21.226,13.658,P<0.05);观察组精神分裂症患者MCBB各项评分均低于对照组,差异有统计学意义(t=14.845~24.862,均P<0.05);高分组精神分裂症患者阳性症状评分(21.10±3.42分)、阴性症状评分(23.37±5.03分)、一般病理症状评分(39.48±8.11分)、附加症状评分(8.26±1.22分)和PANSS总分(92.21±12.50分)均高于低分组(13.65±3.04分,15.62±3.91分,30.14±6.15分,5.20±0.94分,64.61±5.30分),差异有统计学意义(t=14.576,10.964,8.280,17.915,18.764,均P<0.05);高分组精神分裂症患者血清P2X7R,CTGF水平高于低分组,差异有统计学意义(t=12.233,5.923,均P<0.05);精神分裂症患者血清P2X7R,CTGF水平与PANSS各项评分均呈正相关(r=0.464~0.580,均P<0.05),与MCCB各项评分均呈负相关(r=-0.603~-0.439,均P<0.05)。结论精神分裂症患者血清P2X7R和CTGF水平升高,与患者临床症状和认知功能密切相关。
文摘Cholesterol is a major lipid in biological membranes.It not only plays a structural role but also modulates a wide range of functional properties of neurotransmitter and hormone receptors and ion channels.The membraneembedded segments of the paradigm neurotransmitter receptor for acetylcholine(nAChR)contain linear sequences of amino acids with the capacity to recognize cholesterol.These cholesterol consensus domains have been designated as“CARC”and its mirror sequence“CRAC”.CARC preferentially occurs in the exoplasmic-facing membrane leaflet,and CRAC,in the cytoplasmic-facing hemilayer.Both motifs are highly conserved among ion-channel and neurotransmitter receptor proteins in vertebrate nervous systems,where they recognize cholesterol,and in prokaryotic homologues in bacteria,where they recognize hopanoids.This phylogenetically conserved trait is an indication that the hopanoids in some bacteria and cholesterol in eukaryotes subserve analogous functions,probably contributing to the stability of membrane-embedded protein domains.Structural studies from our laboratory using superresolution optical microscopy(“nanoscopy”)have disclosed other interrelated functional and structural properties exerted by cholesterol on the nAChR.The neutral lipid content at the cell surface influences both the macromolecular organization of the receptor and its translational mobility(diffusion)in the plane of the membrane.
