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1.
目的:探究天麻素对Ⅱ型糖尿病神经病理性痛的镇痛作用以及天麻素对背根神经节Nav1.6通道的表达调控作用。方法:将60只雄性SD大鼠随机分为空白对照组、糖尿病组和天麻素处理组(10 mg·kg-1·d-1)。通过高脂饮食喂养4周,低剂量腹腔注射STZ(30 mg·kg-1)的方法构建Ⅱ型糖尿病神经病理性痛大鼠模型,利用痛行为学检测观察各组大鼠的机械刺激足缩反应阈值变化,采用免疫荧光组织化学及Western blot方法观察各组大鼠背根神经节上Nav1.6通道的表达变化。结果:与空白对照组相比,糖尿病模型大鼠出现显著的机械刺激疼痛阈值下降(P<0.05),且模型组大鼠背根神经节神经元上的Nav1.6通道表达上调(P<0.05)。与糖尿病组相比,连续腹腔注射天麻素3天、7天、14天后,模型动物的疼痛明显缓解(P<0.05),另外天麻素可以翻转背根神经节上Nav1.6通道的高表达(P<0.05)。结论:天麻素可能通过降低Nav1.6通道的表达来缓解Ⅱ型糖尿病神经病理性疼痛,从而为天麻素缓解糖尿病神经病理性疼痛提供新的理论依据。  相似文献   

2.
Ye H  Ma WL  Yang ML  Liu SY  Wang DX 《生理学报》2004,56(5):573-578
复制大鼠的慢性吸烟模型,采用气道反应性的测定、HE染色、免疫组织化学染色、原位杂交和免疫印迹实验等方法,观察吸烟对大鼠支气管平滑肌大电导的钙激活的钾通道(BKca)和电压依赖性延迟整流钾通道Kv1.5蛋白和mRNA表达的影响,以阐明吸烟引起的气道高反应性发病机制中钾通道表达变化的作用。结果显示:(1)慢性吸烟可降低大鼠大气道和小气道BKca和Kv1.5蛋白和mRNA表达;(2)大气道BKca的降低程度大于Kv1.5,小气道BKca和Kv1.5的降低程度无明显差异:(3)吸烟对全肺组织BKca和Kv1.5的蛋白表达无明显影响。上述结果提示,慢性吸烟可下调大鼠气道平滑肌钾通道BKca和Kv1.5的表达水平,是导致气道高反应的机制之一。  相似文献   

3.
膀胱中辣椒素受体的分布和功能研究进展   总被引:2,自引:0,他引:2  
膀胱中的辣椒素受体(TRPV1,VR1)主要来源于支配膀胱的感觉神经纤维和膀胱上皮细胞。表达TRPV1的初级感觉神经纤维主要分布在膀胱上皮的基层及基层下,而表达TRPV1的膀胱上皮主要是表层和基层细胞。膀胱中TRPV1的主要功能是感受伤害性刺激而致痛以及感受压力刺激而参与排尿反射。实验性膀胱炎和逼尿肌过度活动时,膀胱中的TRPV1表达增加或被磷酸化而增强其功能。通过脱敏或阻断剂以抑制TRPV1的功能,可以改善某些膀胱病变的症状。  相似文献   

4.
疼痛是一种常见的疾病和临床症状,有时会严重影响患者的生活质量,因此,疼痛的研究、治疗具有重要的实际意义。电压门控钠离子通道在神经元动作电位的起始和传导中起着关键作用,尤其是亚型Nav1.3、Nav1.7、Nav1.8和Nav1.9,它们广泛存在于背根神经节中,参与了疼痛的形成。其中,Nav1.7的基因突变会导致多种遗传性疾病。因此,这些亚型是潜在的、理想的疼痛治疗靶点。主要对电压门控钠离子通道与疼痛有关的最新研究进展进行了综述。  相似文献   

5.
大电导的钙活化钾通道(large—conductance calcium—activated potassium channel,BKCa)和电压依赖性钾通道Kv1.5在气道高反应性的发生机制中具有重要作用。已知吸烟可致气道高反应,但钾通道的变化在其发病中的作用尚需进一步阐明。本文旨在研究香烟提取物(cigarette smoke extract,CSE)对培养的大鼠支气管平滑肌细胞(bronchial smooth muscle cells,BSMCs)钾通道BKCa和Kv1.5表达的直接作用,以及蛋白激酶C(protein kinaseC,PKC)在其中的作用。实验采用原代培养大鼠BSMCs,用5%CSE刺激,免疫印迹检测PKC亚型的表达和转位,半定量RT—PCR、免疫印迹实验检测BKCa和Kv1.5的mRNA和蛋白表达,然后用PKC抑制剂BIM和G6e6983与CSE共作用,检测其对BKCa和Kv1.5的mRNA和蛋白表达的影响。结果显示,5%CSE使PKCε、η、θ发生明显的膜转位,并使BKCa。和Kv1.5的蛋白和mRNA表达明显降低;选择性PKC抑制剂BIM或G6e6983与CSE共同作用,均可使BKCa和Kv1.5的蛋白和mRNA表达部分恢复。上述结果提示,CSE可引起BSMCs的BKCa和Kv1.5表达下调,PKCε、η、θ参与其信号转导。  相似文献   

6.
Nav1.5α亚单位是电压-门控Nav1.5Na+通道发挥作用的核心亚单位,在心肌中首先被成功克隆,是心脏电生理活动最主要的Na+通道α亚单位.最新的研究发现,Nav1.5不仅可以在神经元等非心肌组织中表达,而且其表达的选择性剪接体的类型及电生理学特性与心肌Nav1.5亦不同.目前,不仅对Nav1.5发挥功能的调控机制及与心脏传导功能障碍等疾病的发病关系有了深入的了解,而且一些常见疾病,如肿瘤和癫痫等的发生也被认为可能和Nav1 .5有关. 本文结合国内外对Nav1.5的最新研究及本小组的工作,对Nav1.5的结构、选择 性剪接、基因定位、电生理学活性及与疾病的关系作一详细综述.  相似文献   

7.
为研究猪流行性腹泻病毒(Porcine epidemic diahorrea virus,PEDV)对猪肾传代细胞PK-15miRNA表达谱的影响,将PEDV感染PK-15细胞后,提取总RNA,进行高通量测序,构建感染与未感染PEDV的PK-15细胞的miRNA表达谱,并进行差异性分析,对表达差异显著的miRNA进行heatmap聚类分析及GO(Gene ontology,GO)分子功能(Molecular function,MF)分析,选取10个显著性差异表达的miRNA通过RT-qPCR进行了验证。结果发现,显著性差异表达的miRNA有214个,其中175个miRNA表达上调,39个miRNA表达下调。Heatmap聚类分析表明,病毒组绝大部分差异表达的miRNA较对照组表达量上调,少部分下调。GO分析表明,miRNA广泛参与结合、蛋白结合、蛋白激酶活性、转移酶活性、含磷基团转移、磷酸转移酶活性等生物作用。RT-qPCR验证的各miRNA的表达趋势与高通量测序结果一致。结果表明,猪流行性腹泻病毒感染对PK-15细胞编码的miRNA表达水平有显著影响,从而对进一步研究治疗PEDV的miRNA制剂提供新思路。  相似文献   

8.
【背景】内生真菌印度梨形孢(Piriformospora indica)定殖植物可以显著促进植物生长发育。miRNA已被证实在植物体的生长发育中具有调控作用。【目的】揭示印度梨形孢定殖大麦促进大麦生长发育过程中miRNA对印度梨形孢定殖的响应及对大麦生长发育的调控作用。【方法】提取大麦总RNA,实施转录组测序并进行序列比对与数据挖掘;使用高效液相色谱检测大麦生长素等激素水平变化。【结果】印度梨形孢对大麦有显著促生作用;全转录组测序结果显示:印度梨形孢侵染3 d较空白对照有18个差异表达的miRNA,其中11个miRNA上调、7个miRNA下调;侵染7 d与空白对照相比24个差异表达的miRNA,其中11个miRNA上调、13个miRNA下调;侵染3 d与侵染7 d相比有3个miRNA上调、6个miRNA下调。GO功能富集分析与KEGG通路分析显示,差异表达miRNA的靶基因主要参与转录、细胞分裂、生长素信号的感知和转导、光合作用和激素刺激响应。靶基因所参与的途径与大麦生长发育密切相关,暗示miRNA对印度梨形孢定殖过程做出了积极响应。代谢产物分析表明miRNA参与的调控路径的代谢产物发生改变。【结论】本研究以miRNA为入手点,探究了miRNA对大麦生长发育的调控机制,为揭示印度梨形孢的促生机制提供了新的研究方向。  相似文献   

9.
初步了解HIV-1感染者全血中miRNA表达谱的变化。使用Taqman低密度miRNA表达谱芯片,分别检测10例HIV-1感染者和10例未感染者全血样本中754条miRNA的表达情况。通过BRB分析软件对样本中miR-NAs的表达情况进行比较,筛选出差异表达的miRNA。使用DIANA在线工具预测差异表达miRNAs的靶基因和细胞功能。筛选结果显示有56条miRNAs显著差异表达(P<0.001),其中有49条miRNAs在感染者中下调,7条miRNAs的表达上调。差异表达miRNAs的靶基因涉及的生物学功能相对集中,主要富集在MAPK、TGF-be-ta、Wnt等信号通路。提示:HIV-1感染引起全血中部分miRNAs表达情况的改变。56条显著差异表达的miRNA可能有着重要的作用,对这些miRNA的进一步研究有望发现新的与致病机制相关的关键分子和HIV-1感染诊断潜在的标志物。  相似文献   

10.
目的观察大鼠外周TRPV1和P2X3的相互关系,以期部分阐明外周痛感觉调控机制。方法雄性SD大鼠随机分为空白对照组、TRPV1激动剂组、P2X3激动剂组、TRPV1激动剂+P2X3激动剂组、TPRV1激动剂+P2X3抑制剂组、P2X3激动剂+TRPV1抑制剂组。通过足底皮下注射TRPV1或P2X3激动剂和(或)抑制剂,分别观察20 min内各组大鼠缩足次数、抬腿/舔足持续时间;采用免疫荧光法观察L4DRG水平TRPV1和P2X3阳性面积表达及共表达情况;采用免疫共沉淀法观察L4DRG水平TRPV1和P2X3的相互关系。结果 P2X3激动剂不能提升TRPV1激动剂诱发的痛行为学,P2X3抑制剂能减轻TRPV1激动剂诱发的痛行为学;TRPV1激动剂能增加P2X3激动剂诱发的痛行为学,TRPV1抑制剂不会减轻P2X3激动剂诱发的痛行为。P2X3激动剂能增加L4 DRG水平TRPV1阳性面积表达,TRPV1激动剂能增加L4 DRG水平P2X3阳性面积表达;TRPV1和P2X3在DRG水平有共表达且存在共沉淀现象。结论外周神经元水平,TRPV1和P2X3之间存在一定的相互作用。两者可以相互促进对方的表达。当其中一方受到抑制时,另一方的功能也会相应的降低。  相似文献   

11.
TRPV1(transient receptor potential vanilloid 1)是在机体广泛分布的非选择性阳离子通道,能被氢离子、高温以及其它内源性和外源性配体激活.其在外周神经系统中主要参与伤害性高温的感受以及痛觉过敏等生理机制.TRPV1在中枢神经系统中功能的研究进展主要体现在突触传递,体温调节,痛觉的调制和细胞凋亡等方面.TRPV1的激活降低突触前谷氨酸的释放及增强已存在的突触后AMPA受体的作用,从而增强了突触传递效能.外周的TRPV1通过激活能够抑制血管的收缩和生热作用,从而抑制体温的升高,当TRPV1被阻断时就发生体温过高,而TRPV1体温调节的中枢作用机制可能是通过直接作用于体温调节中枢.脑干的痛觉调制环路的激活TRPV1可以引起谷氨酸盐的释放,进而激活突触后I类mGlu受体以及NMDA受体,从而起到镇痛的功能.另外近年发现TRPV1在中枢也参与呕吐、呼吸、心率及血压的调节.  相似文献   

12.
瞬时受体电位香草酸亚型1(TRPV1)与炎性痛   总被引:1,自引:0,他引:1  
贾岳  洪炎国 《生命科学》2010,(12):1259-1263
瞬时受体电位香草酸亚型1(transient receptor potential vanilloid 1,TRPV1)是TRP超家族的成员之一,是一种非选择性的阳离子通道。TRPV1广泛分布于伤害性感受器上,并且在伤害性感受器中起重要作用。TRPV1能够感受伤害性刺激,将之转化为动作电位,传至中枢形成痛觉。炎症时释放的许多炎症介质都能够与TRPV1发生相互作用,产生疼痛或痛觉过敏,并且通过各种不同的信号通路来调制TRPV1的活性。深入研究TRPV1的作用机制,有助于理解痛觉生理和开发新型镇痛药物。  相似文献   

13.
Coumarin and its derivatives are fragrant natural compounds isolated from the genus Murraya that are flowering plants widely distributed in East Asia, Australia, and the Pacific Islands. Murraya plants have been widely used as medicinal herbs for relief of pain, such as headache, rheumatic pain, toothache, and snake bites. However, little is known about their analgesic components and the molecular mechanism underlying pain relief. Here, we report the bioassay-guided fractionation and identification of a novel coumarin derivative, named muralatin L, that can specifically activate the nociceptor transient receptor potential vanilloid 1 (TRPV1) channel and reverse the inflammatory pain in mice through channel desensitization. Muralatin L was identified from the active extract of Murraya alata against TRPV1 transiently expressed in HEK-293T cells in fluorescent calcium FlexStation assay. Activation of TRPV1 current by muralatin L and its selectivity were further confirmed by whole-cell patch clamp recordings of TRPV1-expressing HEK-293T cells and dorsal root ganglion neurons isolated from mice. Furthermore, muralatin L could reverse inflammatory pain induced by formalin and acetic acid in mice but not in TRPV1 knock-out mice. Taken together, our findings show that muralatin L specifically activates TRPV1 and reverses inflammatory pain, thus highlighting the potential of coumarin derivatives from Murraya plants for pharmaceutical and medicinal applications such as pain therapy.  相似文献   

14.
TRPV1是一种非选择性阳离子通道蛋白,可被伤害性热刺激、辣椒素和氢离子等所激活。由于TRPV1在痛觉传导(尤其是炎症情况下的痛觉传导)中起重要作用,所以TRPV1的研究对临床治疗有十分重要的意义,研究也越来越深入。因为TRPV1可被多种刺激所激活,人们推论其有多个剪接变体(splice variant),不久,即证实了此设想。本文对迄今为止发现的TRPV1剪接变体做一简单综述。  相似文献   

15.

Background

Chronic inflammatory pain, when not effectively treated, is a costly health problem and has a harmful effect on all aspects of health-related quality of life. Despite the availability of pharmacologic treatments, chronic inflammatory pain remains inadequately treated. Understanding the nociceptive signaling pathways of such pain is therefore important in developing long-acting treatments with limited side effects. High local proton concentrations (tissue acidosis) causing direct excitation or modulation of nociceptive sensory neurons by proton-sensing receptors are responsible for pain in some inflammatory pain conditions. We previously found that all four proton-sensing G-protein-coupled receptors (GPCRs) are expressed in pain-relevant loci (dorsal root ganglia, DRG), which suggests their possible involvement in nociception, but their functions in pain remain unclear.

Results

In this study, we first demonstrated differential change in expression of proton-sensing GPCRs in peripheral inflammation induced by the inflammatory agents capsaicin, carrageenan, and complete Freund's adjuvant (CFA). In particular, the expression of TDAG8, one proton-sensing GPCR, was increased 24 hours after CFA injection because of increased number of DRG neurons expressing TDAG8. The number of DRG neurons expressing both TDAG8 and transient receptor potential vanilloid 1 (TRPV1) was increased as well. Further studies revealed that TDAG8 activation sensitized the TRPV1 response to capsaicin, suggesting that TDAG8 could be involved in CFA-induced chronic inflammatory pain through regulation of TRPV1 function.

Conclusion

Each subtype of the OGR1 family was expressed differently, which may reflect differences between models in duration and magnitude of hyperalgesia. Given that TDAG8 and TRPV1 expression increased after CFA-induced inflammation and that TDAG8 activation can lead to TRPV1 sensitization, it suggests that high concentrations of protons after inflammation may not only directly activate proton-sensing ion channels (such as TRPV1) to cause pain but also act on proton-sensing GPCRs to regulate the development of hyperalgesia.  相似文献   

16.
The capsaicin receptor TRPV1 is an emerging target for the treatment of pain with a unique expression profile in peripheral nociceptors and the ability to show polymodal activation, TRPV1 is an important integrator of responses to inflammatory mediators. Sensitization of TRPV1 during chronic pain is believed to contribute to the transduction of noxious signaling for normally innocuous stimuli and consequently the search for novel TRPV1 therapeutics is intense. The current understanding of the physiological role the receptor, as well as the potential therapeutic utility and emerging liabilities of TRPV1 modulators are discussed.  相似文献   

17.
Patients with inflammatory or neuropathic pain experience hypersensitivity to mechanical, thermal and/or chemical stimuli. Given the diverse etiologies and molecular mechanisms of these pain syndromes, an approach to developing successful therapies may be to target ion channels that contribute to the detection of thermal, mechanical and chemical stimuli and promote the sensitization and activation of nociceptors. Transient Receptor Potential (TRP) channels have emerged as a family of evolutionarily conserved ligand-gated ion channels that contribute to the detection of physical stimuli. Six TRPs (TRPV1, TRPV2, TRPV3, TRPV4, TRPM8 and TRPA1) have been shown to be expressed in primary afferent nociceptors, pain sensing neurons, where they act as transducers for thermal, chemical and mechanical stimuli. This short review focuses on their contribution to pain hypersensitivity associated with peripheral inflammatory and neuropathic pain states.  相似文献   

18.
Eicosanoids play a crucial role in inflammatory pain. However, there is very little knowledge about the contribution of oxidized linoleic acid metabolites in inflammatory pain and peripheral sensitization. Here, we identify 12,13-dihydroxy-9Z-octadecenoic acid (12,13-DiHOME), a cytochrome P450-derived linoleic acid metabolite, as crucial mediator of thermal hyperalgesia during inflammatory pain. We found 12,13-DiHOME in increased concentrations in peripheral nervous tissue during acute zymosan- and complete Freund's Adjuvant-induced inflammatory pain. 12,13-DiHOME causes calcium transients in sensory neurons and sensitizes the transient receptor potential vanilloid 1 (TRPV1)-mediated intracellular calcium increases via protein kinase C, subsequently leading to enhanced TRPV1-dependent CGRP-release from sensory neurons. Peripheral injection of 12,13-DiHOME in vivo causes TRPV1-dependent thermal pain hypersensitivity. Finally, application of the soluble epoxide hydrolase (sEH)-inhibitor TPPU reduces 12,13-DiHOME concentrations in nervous tissue and reduces zymosan- and CFA-induced thermal hyperalgesia in vivo. In conclusion, we identify a novel role for the lipid mediator 12,13-DiHOME in mediating thermal hyperalgesia during inflammatory pain and propose a novel mechanism that may explain the antihyperalgesic effects of sEH inhibitors in vivo.  相似文献   

19.
目的探讨脊髓背根神经节(dorsal root ganglia,DRG)P2X3受体参与大鼠足底慢性炎症痛相关的热痛觉过敏机制。方法 1)用行为学的研究方法,以大鼠右侧后脚掌注射松节油加石蜡(各占50%)0.1ml建立后脚掌慢性痛模型,用热测痛的方法测量后脚掌皮下注射松节油后的痛阈,每天1次,连续测15d。2)用免疫组织化学技术观察大鼠后脚掌慢性炎症后第2天和第7天,炎症侧脊髓背根神经节(L4—6)神经元中P2X,受体阳性细胞类型的分布变化;以及正常脊髓背根神经节(L4—6)神经元中P2X,受体阳性细胞类型的分布作为对照。结果1)炎症后大鼠后脚掌侧痛阈出现降低,在第2天痛阈达到最低,后逐渐恢复,14d后恢复正常痛阈值。2)正常大鼠P2X,主要表达于DRG的中小神经元上,炎症后DRG(L4—6),中小型P2X,受体阳性细胞数比对照组明显增加。细胞平均面积增大。结论后脚掌慢性炎症痛可以引起大鼠对伤害性热刺激的痛觉过敏,并导致脊髓背根神经节(L4—6)神经元qbP2X3受体阳性细胞数目增加,表明P2X3在DRG的中小神经元的改变可能对松节油引起脚掌炎症痛时热痛觉过敏的形成与维持起重要作用。  相似文献   

20.
Despite significant progress in our understanding of the cellular and molecular mechanisms underlying sensory transduction and nociception, clinical pain management remains a considerable challenge in health care and basic research. The identification of the superfamily of transient receptor potential (TRP) cation channels, particularly TRPV1 and TRPA1, has shed light on the molecular basis of pain signaling during inflammatory conditions. TRPV1 and TRPA1 are considered as potential targets in the treatment of inflammatory pain because of their ability to be activated by nociceptive signals and sensitized by pro-inflammatory mediators. Notably, TRPA1 is expressed in visceral afferent neurons and is known to participate in inflammatory responses and the establishment of hypersensitivity. This review summarizes the current knowledge of the role of TRPA1 in sensory transduction, particularly in the context of visceral inflammation and pain in the gastrointestinal and urinary tracts.  相似文献   

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