触液核GluN2B-BDNF通路介导大鼠神经病理性疼痛的发生（英文）

本研究旨在探讨触液核GluN2B-BDNF通路在神经病理性疼痛中的作用。应用侧脑室注射特异性触液核示踪剂霍乱毒素亚单位B与辣根过氧化物酶复合物(cholera toxin subunit B conjugated with horseradish peroxidase, CB-HRP)的方法标记触液核;通过免疫荧光双标染色和Western blot观察大鼠触液核GluN2B和BDNF的表达;采用坐骨神经慢性压迫性损伤法(chronic constriction injury of sciatic nerve, CCI)建立大鼠慢性神经病理性疼痛模型;通过侧脑室注射GluN2B拮抗剂和BDNF中和抗体观察CCI大鼠的行为学变化。结果显示,GluN2B和BDNF均在触液核内表达,并且在CCI大鼠表达上调;侧脑室注射GluN2B拮抗剂或BDNF中和抗体能够减轻CCI大鼠的热痛觉过敏和机械性痛觉超敏;而且侧脑室注射GluN2B拮抗剂能够逆转CCI大鼠BDNF的表达上调。以上结果提示,大鼠触液核内有GluN2B和BDNF的表达,并且触液核GluN2B-BDNF通路参与了大鼠神经病理性疼痛的发生。     

高压氧处理抑制神经病理性疼痛大鼠炎性细胞因子的表达

目的观察高压氧(hyperbaric oxygen,HBO)对坐骨神经慢性结扎损伤(chronic constriction injury,CCI)神经病理性疼痛大鼠TNF-α,IL-1β,IL-6炎性因子的影响,探讨其镇痛机制。方法 30只SD大鼠随机分为假手术组(S),坐骨神经结扎组(CCI)和结扎后高压氧组(CCI+HBO)3组,CCI术后每天都进行疼痛行为学评分,并在术后7天,用ELISA及脊髓的免疫组织化学方法检测各组大鼠炎性因子的表达水平。结果 CCI大鼠的疼痛行为学评分明显降低,高压氧处理可改善CCI大鼠疼痛行为学评分;ELISA检测到CCI大鼠TNF-α、IL-1β和IL-6血清含量明显升高,高压氧处理可减少CCI大鼠TNF-α、IL-1β和IL-6血清含量的升高;免疫组织化学检测发现CCI大鼠脊髓背角Ⅰ、Ⅱ层内TNF-α、IL-1β、IL-6阳性神经元数量增加,高压氧处理的CCI大鼠脊髓背角Ⅰ、Ⅱ层内TNF-α、IL-1β、IL-6阳性神经元数量的增加明显少于单纯CCI小鼠。结论高压氧可以抑制炎性因子的表达,这可能与其缓解神经病理性疼痛有关。     

姜黄素下调脊髓Toll样受体4及下游细胞因子减弱大鼠神经病理性痛

观察鞘内注射姜黄素对坐骨神经慢性压迫性损伤(CCI)大鼠痛阈和脊髓组织Toll样受体4(TLR4)及TNF-α、IL-1β和IL-10表达的影响．鞘内置管的120只大鼠随机均分为4组：假手术组(Sham),CCI组,溶剂对照组(SC),姜黄素治疗组(Cur,100 μg/天),建立CCI大鼠疼痛模型,术后第1、3、7、10和14天鞘内给药并测定痛阈,第3、7天取腰段脊髓第4～6节段(L4～L6)以Real-time PCR与Western blotting方法检测TLR4、HMGB1 mRNA和蛋白质的表达,ELISA法观察脊髓组织中TNF-α、IL-1β及IL-10表达变化．与Sham组相比,CCI组大鼠机械性痛阈与热痛阈显著降低(均P<0.05),同时脊髓组织TLR4、HMGB1 mRNA和蛋白质的表达明显增加(均P<0.05),TNF-α、IL-1β与IL-10的含量也明显升高(均P<0.05);鞘内注射姜黄素明显降低脊髓TLR4、高迁移率族蛋白1(HMGB1),TNF-α和IL-1β的表达,显著升高脊髓IL-10的表达,同时明显改善CCI大鼠疼痛行为(P<0.05)．姜黄素减轻神经病理性疼痛可能与下调TLR4途径促炎症因子表达有关,抑制TLR4途径有望成为治疗神经病理性疼痛的新策略．     

大鼠触液核MrgA的分布及其在神经病理性疼痛状态下的表达增加

本文旨在观察MrgA (Mas-related G protein-coupled receptor A)在正常大鼠触液核的分布及其在神经病理性疼痛条件下的表达变化,为触液核通过MrgA参与神经病理性疼痛的信息传递或调节提供形态学依据。按照文献建立坐骨神经慢性结扎损伤(chronic constriction injury of sciatic nerve, CCI)大鼠模型,用Von Frey电子测痛仪和热痛敏刺激仪监测大鼠痛行为,用霍乱毒素B亚单位结合辣根过氧化物酶(CB-HRP)追踪和免疫荧光标记相结合的方法来检测并比较MrgA在正常和CCI大鼠触液核的表达及变化。结果显示,CCI大鼠第5、7、10、14天的机械缩足反射阈值和热缩足潜伏期显著降低,MrgA在正常大鼠触液核有分布,CCI大鼠神经病理性疼痛达到峰值时触液核MrgA表达水平显著高于正常对照组。以上结果提示,触液核可能通过MrgA参与了神经病理性疼痛的信息传递或调节。     

右美托咪啶可通过下调Toll样受体4(TLR4)和核因子-kappa b(NF-κB)来减轻神经病理性痛

为了探讨右美托咪啶对神经病理性痛大鼠脊髓背角Toll样受体4(toll like receptor 4,TLR4)和核因子-kappa b(nuclear factor-kappa b,NF-κB)表达的影响,我们选取了54只6~8周的雄性Wistar大鼠,将大鼠随机分为假手术组、模型组和观察组,每组18只,其中模型组和观察组大鼠建立慢性压迫性损伤(chronic constriction injury,CCI)模型。我们检测了各组机械痛阈(mechanical withdrawal threshold,MWT)和热痛阈(thermal withdrawl latency,TWL),并采用RT-PCR和Western blotting方法检测了各组大鼠脊髓4~6节段TLR4和NF-κB的mRNA和蛋白表达。我们发现,术后7 d和14 d模型组和观察组大鼠的MWT和TWL明显低于假手术组(p0.05),且较术前有所降低(p0.05);观察组术后7 d和14 d的MWT和TWL均明显高于模型组(p0.05);模型组和观察组术后7 d和14 d TLR4和NF-κB的mRNA和蛋白表达水平明显高于假手术组(p0.05),且较术前有所增高(p0.05);观察组术后7 d和14 d TLR4和NF-κB mRNA的表达均明显低于模型组(p0.05);观察组术后7 d和14 d TLR4和NF-κB蛋白的表达均明显低于模型组(p0.05)。研究表明,右美托咪啶可减轻神经病理性痛,且与其下调TLR4和NF-κB表达有一定的关系。我们的研究为神经病理性痛机制的研究及治疗提供了一定的帮助。     

IGF-1对缺血性脑损伤大鼠脑内神经发生的影响

目的:建立大鼠单侧局灶脑缺血模型,观察胰岛素样生长因子-1(IGF-1)对局灶脑缺血后的鼠脑神经发生及增殖后细胞生存的影响.方法:用健康雄性SD大鼠建立大脑中动脉阻塞(MCAO)模型,随机分成假手术组,缺血对照组和IGF-1治疗组.各组再按不同的治疗时间分为7d、14d、28d、42d组.免疫组化法观察BrdU、PSA-NCAM的变化,免疫双标法观察BrdU/PSA-NCAM、BrdU/MAP2和BrdU/GFAP的共同表达变化.结果:BrdU标记细胞和PSA-NCAM标记细胞计数均在缺血后第7d最多,分别是缺血对照组的4.0倍和1.8倍,是假手术组的9.9倍和5.4倍.BrdU和PSA-NCAM双标细胞在缺血发生后双侧SVZ和DG区可以检测到,于第7d计数最多,之后逐渐降低;而BrdU和MAP2以及BrdU和GFAP双标细胞却从第14d开始逐渐增多,直到第42d.随着BrdU/PSA-NCAM双标阳性表达的逐渐降低,BrdU/MAP2双标阳性表达逐渐增高,呈现此消彼涨的变化.结论:IGF-1侧脑室注射后,在早期(7d内)诱导了缺血性脑损伤后神经细胞的增殖;在中期(7d-14d)诱导了新生细胞的迁移;在后期(14d后)伴随着迁移的进行新生细胞逐渐发生了分化.     

氧化应激对肝星状细胞转录因子Nrf2核转位的影响

目的:研究细胞转录因子NF-E2相关因子2(nuclear factor-erythroid 2 related factor 2,Nrf2)在大鼠肝星状细胞系HSC-T6中的表达及氧化应激对其核转位的影响.方法:将大鼠肝星状细胞(HSC-T6)分成空白对照组和氧化应激组,氧化应激组加入100mU/ml葡萄糖氧化酶(glucose oxidase,GO)干预2h制备细胞氧化应激模型,空白对照组予以DMEM正常培养未进行GO干预.Western blot方法检测Nrf2总蛋白及核蛋白的变化,细胞免疫化学法观察HSC-T6细胞Nrf2核转位情况,流式细胞术检测细胞内活性氧(reactive oxygen species,ROS)水平的变化,分光光度法检测细胞丙二醛(malondialdehyde,MDA)、谷胱甘肽(glutathione,GSH)水平.结果:1氧化应激组ROS及MDA水平较空白对照组显著升高(P<0.01).2 WB显示Nrf2总蛋白在两组的表达无显著差异,而Nrf2核蛋白在空白对照组中无明显表达,在氧化应激组表达明显增加;ICC显示空白对照组中Nrf2蛋白仅在胞浆中表达;而氧化应激组胞核和胞浆中均可见Nrf2蛋白表达.3氧化应激组GSH水平较空白对照组显著升高(P<0.01).结论:在氧化应激过程中Nrf2发生核转位从而发挥其生物学功能.     

去卵巢致骨质疏松症大鼠腺垂体FS细胞中Cx43、S-100蛋白表达--激光扫描共聚焦显微镜观察

检测间隙连接蛋白Cx43、神经组织蛋白S-100在去卵巢致骨质疏松症(OVX-OP)大鼠腺垂体滤泡星形细胞(FS细胞)中的表达.实验采用10月龄未孕产SD雌性大鼠40只,随机均分为卵巢切除组(OVX组,n=20)和假性手术对照组(Sham组,n=20).于术后6周末用双能X线骨吸收测量法(DEXA)测量大鼠全身及腰椎4-6(L4-6)骨密度(BMD).取两组大鼠垂体,制成连续切片.应用FITC标记的IgG探针,对腺垂体组织中Cx43和S-100进行间接免疫荧光染色,并用激光扫描共聚焦显微镜(LSCM)定位和定量分析腺垂体FS细胞中Cx43、S-100的表达.结果发现,术后6周末OVX组大鼠全身及L4-6BMD均明显低于Sham组值(P<0.01,P<0.01).Cx43阳性荧光反应主要定位于相邻的FS细胞的胞浆中和/或胞膜上.OVX组Cx43阳性表达荧光强度和表达阳性率均显著低于Sham组(P<0.01).S-100蛋白表达定位于FS细胞的胞浆中,两组间S-100阳性表达荧光强度和表达阳性率无显著差异(P>0.05).本研究提示,SD大鼠OVX术后6周出现骨质疏松变化;OVX大鼠腺垂体FS细胞数量无明显变化、而Cx43表达显著下降,后者的变化可能与大鼠OVX-OP发生相关.     

移植BMMSCs-蚕丝蛋白生物支架对急性大鼠脊髓半切损伤修复的影响

目的:以蚕丝蛋白支架(silk fibroin porous scaffolds SFPS)接种骨髓基质干细胞(bone marrow mesenchymal stem cells,BMMSCs)移植入SD大鼠脊髓半切损伤模型内,观察BMMSCs-SFPS复合生物支架对损伤脊髓的修复作用.方法:密度梯度离心法提取、贴壁法培养BMMSCs,取第三代对数生长期细胞,采用注射法制备BMMSCs-SFPS复合支架,复合14天进行生物相容性检测.40只SD大鼠复制脊髓半切损伤模型后随机分配为四组(n=10):A组BMMSCs-SFPS联合移植、B组单独移植BMMSCs、C组单独移植SFPS、D组为空白对照组,移植后分别于1、2、3、4周进行运动功能评分和术后4周进行HE染色观察、免疫荧光检测.结果:BMMSCs-SFPS复合支架体外培养14天后,扫描电镜可见BMMSCs附于SFPS支架内表面生长,细胞贴附良好并互有接触.移植入脊髓半切损伤模型后4周进行HE染色,结果显示A组脊髓空洞较其余三组小,免疫荧光检测结果示A组NF200、Nestin阳性表达高于B、C、D组,A组GFAP表达则明显低于其余三组.A组术后2～4周Basso-Beattie-Bresnahan (BBB)评分均高于同期B、C、D组,比较差异有统计学意义(P＜0.01),D组评分明显低于同期其他3组,差异有统计学意义(P＜0.05).结论:BMMSCs-SPFS具有良好生物相容性,复合支架保证BMMSCs的存活数量、能抑制胶质瘢痕.BMMSCS-SFPS复合生物支架能发挥协同作用,促进脊髓半切损伤的大鼠运动功能恢复.     

CCI大鼠坐骨神经损伤区内中终球与重链神经微丝蛋白的检测

为探寻CCI大鼠坐骨神经损伤区内终球的存在,了解其与重链神经微丝蛋白(heavy neurofilaments,NF-H)分布、表达的联系.通过对雄性SD大鼠的坐骨神经慢性压迫损伤(chronic constriction injury,CCI)组与对照组(对侧正常坐骨神经)进行不同时间点电镜、免疫组化及Western-blotting等方法的观察与检测.研究发现,与对照组相比,CCI模型组大鼠术后4 d损伤坐骨神经中NF的分布较非手术侧有明显变化,术后7、14 d电镜观察到损伤区中枢侧终球样结构,术后4、7、14、28 d CCI模型组大鼠坐骨神经中NF-H表达水平有动态变化(P<0.01).结果表明CCI大鼠模型损伤坐骨神经中NF-H其分布有明显变化,且分布于终球样结构中,其表达随损伤时间有动态变化,这些变化可能参与终球的形成以及与病理性疼痛机制相关联.     

Vatalanib decrease the positive interaction of VEGF receptor-2 and P2X(2/3) receptor in chronic constriction injury rats

Neuropathic pain can arise from a lesion affecting the peripheral nervous system. Selective P2X(3) and P2X(2/3) receptors' antagonists effectively reduce neuropathic pain. VEGF inhibitors are effective for pain relief. The present study investigated the effects of Vatalanib (VEGF receptor-2 (VEGFR-2) inhibitor) on the neuropathic pain to address the interaction of VEGFR-2 and P2X(2/3) receptor in dorsal root ganglia of chronic constriction injury (CCI) rats. Neuropathic pain symptoms following CCI are similar to most peripheral lesions as assessed by the Neuropathic Pain Symptom Inventory. Sprague-Dawley rats were randomly divided into sham group, CCI group and CCI rats treated with Vatalanib group. Mechanical withdrawal threshold and thermal withdrawal latency were measured. Co-expression of VEGFR-2 and P2X(2) or P2X(3) in L4-6 dorsal root ganglia (DRG) was detected by double-label immunofluorescence. The modulation effect of VEGF on P2X(2/3) receptor agonist-activated currents in freshly isolated DRG neurons of rats both of sham and CCI rats was recorded by whole-cell patch-clamp technique. The mechanical withdrawal threshold (MWT) and thermal withdrawal latency (TWL) in CCI group were lower than those in sham group (p<0.05). MWT and TWL in CCI rats treated with Vatalanib group were increased compared with those in CCI group (p<0.05). VEGFR-2 and P2X(2) or P2X(3) receptors were co-expressed in the cytoplasm and surface membranes of DRG. The co-expression of VEGFR-2 and P2X(2) or P2X(3) receptor in CCI group exhibited more intense staining than those in sham group and CCI rats treated with Vatalanib group, respectively. VEGF enhanced the amplitude of ATP and α,β-meATP -activated currents of both sham and CCI rats. Increment effects of VEGF on ATP and α,β-meATP -activated currents in CCI rats were higher than those in sham rats. Both ATP (100 μM) and α,β-meATP (10 μM)- activated currents enhanced by VEGF ( 1nM) were significantly blocked by Vatalanib (1 μM, an inhibitor of VEGF receptors). The stain values of VEGFR-2, P2X(2) and P2X(3) protein expression in L4/5 DRG of CCI treated with Vatalanib group were significantly decreased compared with those in CCI group (p<0.01). Vatalanib can alleviate chronic neuropathic pain by decreasing the activation of VEGF on VEGFR-2 and the positive interaction between the up-regulated VEGFR-2 and P2X(2/3) receptors in the neuropathic pain signaling.     

Proteomic Analysis of Differential Proteins Related to Anti-nociceptive Effect of Electroacupuncture in the Hypothalamus Following Neuropathic Pain in Rats

Increasing evidence has been accumulated for the effectiveness of acupuncture therapy in relieving pain. However, there are limited data on regulation of protein expression after electroacupuncture (EA) intervention. Thus, the present study is designed to determine changes in protein expression following EA stimulation in rats with sciatic nerve chronic constrictive injury (CCI) induced neuropathic pain. Sixty Wistar rats were equally randomized into normal control group, CCI group, and CCI with EA stimulation (EA) group. The CCI model was established by ligature of the left sciatic nerve. EA stimulation was applied at Zusanli (ST36) and Yanglingquan (GB34) in the EA group. Differentially expressed hypothalamic proteins in the three groups were identified by 2-D gel electrophoresis and matrix-assisted laser desorption/ionization time of flight mass spectrometry. The functional clustering and pathway of the identified proteins were analyzed by Mascot software. Results showed that, after CCI, the thermal pain threshold of the affected hind footpad was decreased and was reversed gradually by 12 sessions of EA treatment. Following EA intervention, there were 17 hypothalamic proteins identified with significant changes in the expression (>twofold). Three gene-ontologies (oxidoreductase activity, oxidation reduction, and protein binding) were enriched, while there was a significant regulation of glycolysis/gluconeogenesis/hexose metabolism pathway. These data demonstrate that EA intervention can attenuate pain via regulation of expression of multiple proteins in the hypothalamus. Further, hypothalamic glucose metabolism may be important in supporting energy and neurotransmitter homeostasis in the effects of EA intervention.     

人参皂苷Rg2对慢性坐骨神经损伤大鼠痛觉敏化和抑郁状态的影响*

目的:观察人参皂苷Rg₂对慢性坐骨神经损伤大鼠痛觉敏化、抑郁状态的影响。方法: 将50只 SD 大鼠随机分为 5组(n=10): 空白对照组(Normal+生理盐水腹腔注射)、假手术组(手术但不结扎+生理盐水腹腔注射) 、坐骨神经慢性压迫损伤(CCI)组(CCI +生理盐水腹腔注射) 、人参皂苷Rg₂低剂量组(CCI+ Rg₂ 5 mg/kg腹腔注射)、人参皂苷Rg₂高剂量组(CCI+ Rg₂ 10 mg/kg 腹腔注射)。CCI模型建立后,药物通过注射器进行腹腔内注射 5 ml/kg,每天1次,连续14 d。分别在术前1 d和术后 1、3、5、7、10、14 d测定大鼠的机械性缩足反射阈值(MWT)和热缩足潜伏期(TWL);术前1 d和术后第14日时检测明暗箱实验和强迫游泳试验。 结果:与假手术组比较,CCI组术后14 d机械痛阈值和热痛潜伏期明显缩短(P＜0.01),明箱内停留时间明显缩短(P＜0.01),穿梭次数明显减少(P＜0.01),游泳潜伏期明显延长(P＜0.01)。与CCI组比较,人参皂苷Rg₂组术后14 d机械痛阈和热痛潜伏期明显增加(P＜0.01),大鼠在明箱内时间明显延长(P＜0.01),穿梭次数明显增多(P＜0.01),且游泳潜伏期明显缩短(P＜0.01)。结论:人参皂苷Rg₂能抑制 CCI 大鼠的机械痛敏和热痛敏,同时改善其抑郁状态。     

靶向毁损触液核对大鼠痛行为及脊髓背角5-HT和c-Fos表达的影响

目的：观察缺失触液核（CSF-contacting nucleus）对大鼠痛行为及脊髓背角痛相关物质5-羟色胺（5-HT）和c—Fas表达的影响,为触液核参与疼痛调制及机制提供实验依据。方法：成年雄性SD大鼠随机分为正常组（Control）,假手术组（Sham）,霍乱毒素亚单位B与辣根过氧化酶复合物（CB—HRP）组和毁损触液核组（Damage）。以机械缩足阈值（MWT）和热缩足潜伏期（耶儿）测定大鼠痛行为。免疫荧光法检测脊髓背角5-HT和c—Fos表达,并进行痛行为阈值与物质变化趋势的相关分析。结果：与Control、Sham和CB—HRP组相比,Damage组大鼠MWT和TWL明显降低（P〈0．05）。免疫荧光结果显示,正常大鼠触液核神经元高表达5-HT;Damage组大鼠触液核神经元数量随毁损天数延续逐渐减少,且在给予毁损剂CB—SAP第10天完全消失。与此同时脊髓背角5-HT和c—Fos表达量日趋增加,且与痛行为阈值变化趋势成负相关。结论：CB—SAP能科学可靠靶向毁损触液核,缺失触液核可致大鼠痛行为阈值减低,而脊髓背角5-HT和c—Fos表达量增加。本研究提示触液核参与了疼痛调制,且5-HT和c—Fos在此调制中发挥了重要作用。     

人白细胞介素10基因慢病毒载体的构建及其对CCI大鼠的镇痛作用

目的 构建含人白细胞介素10基因的慢病毒载体LV-hIL-10,观察鞘内注射LV-hIL-10对坐骨神经松结扎模型（chronic constriction injury,CCI）大鼠的镇痛作用。方法 应用PCR从pCYIL-10质粒上扩增hIL-10基因,把hIL-10基因亚克隆至pWPXL质粒上得到重组质粒pWPXL- hIL-10,将pWPXL- hIL-10与psPAX2、pMD2.G共转293T,收集上清浓缩后制备LV-hIL-10。同时将空质粒pWPXL-GFP与psPAX2、pMD2.G共转293T,收集上清浓缩后作实验对照。纯种健康清洁级成年雄性SD大鼠135只,随机分为9组: CCI疼痛模型4组（C0、C1、C2、C3）,假手术4组（S0、S1、S2、S3）和正常对照组（N组）。给药组在蛛网膜下腔分别注射LV-hIL-10（C1组、S1组）、LV-GFP（C2组、S2组）、生理盐水（C3组、S3组）,对照组C0组、S0组不做鞘内置管,不给药。各组在手术造模成功实施鞘内注射后观察LV-hIL-10组不同时间点痛阈的改变及脊髓、脑皮质、海马中的hIL-10 mRNA和蛋白表达。结果 获得IL-10 基因片段,成功重组pWPXL- hIL-10载体,经序列验证无误。质粒共转染293T细胞后,获得了高滴度（2x1010）、高纯度的LV-hIL-10病毒颗粒。CCI大鼠鞘内注射LV-hIL-10后痛觉异常明显缓解,脊髓、脑皮质、海马中的IL-10表达上调,脊髓中IL-10表达上调最显著。结论 鞘内注射慢病毒感染导入型人IL-10表达质粒对CCI大鼠有明显镇痛效应     

Loganin prevents chronic constriction injury-provoked neuropathic pain by reducing TNF-α/IL-1β-mediated NF-κB activation and Schwann cell demyelination

BackgroundPeripheral nerve injury can produce chronic and ultimately neuropathic pain. The chronic constriction injury (CCI) model has provided a deeper understanding of nociception and chronic pain. Loganin is a well-known herbal medicine with glucose-lowering action and neuroprotective activity.PurposeThis study investigated the molecular mechanisms by which loganin reduced CCI-induced neuropathic pain.MethodsSprague–Dawley rats were randomly divided into four groups: sham, sham+loganin, CCI and CCI+loganin. Loganin (1 or 5 mg/kg/day) was injected intraperitoneally once daily for 14 days, starting the day after CCI. For behavioral testing, mechanical and thermal responses were assessed before surgery and on d1, d3, d7 and d14 after surgery. Sciatic nerves (SNs) were collected to measure proinflammatory cytokines. Proximal and distal SNs were collected separately for Western blotting and immunofluorescence studies.ResultsThermal hyperalgesia and mechanical allodynia were reduced in the loganin-treated group as compared to the CCI group. Loganin (5 mg/kg/day) prevented CCI from inducing proinflammatory cytokines (TNF-α, IL-1β), inflammatory proteins (TNF-α, IL-1β, pNFκB, pIκB/IκB, iNOS) and receptor (TNFR1, IL-1R), adaptor protein (TRAF2) of TNF-α, and Schwann cell demyelination and axonal damage. Loganin also blocked IκB phosphorylation (p-IκB). Double immunofluorescent staining further demonstrated that pNFκB/pIκB protein was reduced by loganin in Schwann cells on d7 after CCI. In the distal stumps of injured SN, Schwann cell demyelination was correlated with pain behaviors in CCI rats.ConclusionOur findings indicate that loganin improves CCI-induced neuroinflammation and pain behavior by downregulating TNF-α/IL-1β-dependent NF-κB activation.     

外源性的电磁干预对神经病理性疼痛大鼠的镇痛效果研究

目的:探讨外源性的电磁干预方法对神经病理性疼痛大鼠的镇痛效果。方法:将30只成熟的雄性SD大鼠随机等分成3组:空白对照组(Control),坐骨神经慢性压迫损伤(CCI)组以及坐骨神经慢性压迫损伤协同电磁刺激组(CCI+EMF)。CCI组和CCI+EMF组的20只大鼠建立坐骨神经慢性压迫损伤模型,CCI+EMF组大鼠行外源性的全身性电磁刺激干预(脉冲波形,频率15 Hz,强度30 Gs),每天刺激6小时。在CCI模型构建的第0、3、6、9、12及15天对大鼠测试和比较足底机械痛阈值、足底热痛阈值、运动功能评分和神经传导速率。结果:CCI组大鼠的足底机械痛阈值、足底热痛阈值及感觉神经传导速率从CCI手术后的第3天即出现显著性降低,其6、9、12、15天足底机械痛阈值、足底热痛阈值及感觉神经传导速率均显著低于Control组(P0.01),而运动功能评分均显著高于Control组(P0.05)。CCI+EMF组大鼠的足底机械痛阈值、足底热痛阈值及感觉神经传导速率在第9、12、15天显著高于CCI组大鼠(P0.05),而运动功能评分均显著高于CCI l组。结论:外源性的电磁刺激对于神经病理性疼痛大鼠具有良好的镇痛效果,有望成为一种临床治疗神经病理性疼痛的新的物理治疗手段。