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1.
目的 探讨鞘内注射转录因子下游调控元件拮抗因子-短发夹RNA(DREAM-shRNA)对神经病理性痛大鼠脊髓背角磷酸化环磷酸腺苷反应元件结合蛋白(p-CREB)表达的影响.方法 成年健康雄性SD大鼠,体重280~320 g,采用坐骨神经慢性压迫(CCI)法建立大鼠神经病理性痛模型.于CCI后第3天鞘内置管.取鞘内置管成功的大鼠24只,随机分为4组,每组6只,假手术组(S组):仅暴露坐骨神经,不结扎;神经病理性痛组(NP组):于CCI后第8天鞘内注射生理盐水10 μl;RNA干扰组(RNAi组):于CCI后第8天鞘内注射DREAM-shRNA 5 μl和牛理盐水5 μl;空白载体组(BV组):于CCI后第8天鞘内注射慢病毒空白载体5 μl和生理盐水5μl,各组连续注射7 d.于CCI前1 d(T0,基础状态)、CCI后第7~14天(T1-8)时测定机械痛阈.于CCI后第15天时测定脊髓背角绿色荧光蛋白(GFP)和p-CREB的表达水平.结果 与基础值比较,各组各时点机械痛阈降低(P<0.05或0.01);与T1时比较,NP组和BV组T5-8时机械痛阈降低,RNAi组T8时机械痛阈升高(P<0.05或0.01);与S组比较,NP组和BV组机械痛阈降低,RNAi组T2时机械痛阈降低,T8时升高,NP组、RNAi组和BV组脊髓背角p-CREB表达上调(P<0.05);与NP组比较,RNAi组T6-8时机械痛阈升高,脊髓背角p-CREB表达下调(P<0.05).RNAi组脊髓背角可见大量绿色荧光,即GFP表达阳性,其余3组脊髓背角未见绿色荧光,即GFP无表达.结论 鞘内注射DREAM-shRNA缓解大鼠神经病理性痛的机制可能与抑制脊髓背角p-CREB的表达有关.  相似文献   

2.
Objective To investigate the effects of intrathecal (IT) DREAM-short hairpin RNA (DREAM-shRNA) on expression of phosphorylated cyclic AMP response element binding protein (p-CREB) in the spinal dorsal horn in a rat model of neuropathic pain. Methods Adult male SD rats weighing 280-320 g were anesthetized with intraperitoneal 10% chloral hydrate. Neuropathic pain was induced by chronic constrictive injury (CCI) to sciatic nerve. IT catheters were placed according to the method described by Yaksh on 3rd day after CCI. Twenty-four rots in which IT catheter was successfully implanted were randomly divided into 4 groups (n = 6 each) : group Ⅰ sham operation (group S) ; group Ⅱ neuropathic pain (group NP) ; group Ⅲ RNA interference (group RNAi) and group Ⅳ blank vector (group BV). Lentivius with DREAM-shRNA 5 μl was injected IT in group RNAi, and blank vector 5 μl in group BV, and once a day for 7 days, starting from the day 8 after CCI. The mechanical pain threshold was measured at day 1 before CCI (T0 ,baseline) and day 7-14 after CCI (T1-8). The animals were killed on 15th day after CCI. The L4-6 lumbar segment of the spinal cord was removed for determination of the expression of green fluorescent protein (GFP) and p-CREB by immuno-fluorescent method.Results The mechanical pain threshold was significantly decreased as compared with the baseline at T0 in all 4 groups and returned to the baseline levels at T5-8 in group S and RNAi, but remained low in group NP and BY. The mechanical pain threshold was significantly lower after CCI/sham operation and significanty higher at T8 in group RNAi than in the other 3 groups. The expression of p-CREB in the spinal dorsal horn was up-regulated in group NP, RNAi and BV as compared with group S, and in group NP and BV as compared with group RNAi. The green fluorescence was observed in group RNAi but not in the other 3 groups. Conclusion IT DREAM-shRNA can ameliorate neuropathic pain in rats through inhibiting the expression of p-CREB in the spinal dorsal horn.  相似文献   

3.
目的 评价鞘内注射p300小干扰RNA(p300siRNA)对神经病理性痛大鼠的镇痛效果.方法 取鞘内置管成功的雄性SD大鼠96只,采用坐骨神经慢性压迫性损伤法(CCI)建立神经病理性痛模型,随机分为4组(n=24):假手术+生理盐水组(S组)、CCI+生理盐水组(CCI组)、CCI+转染试剂组(V组)和CCI+p300siRNA组(P组).于术后3~6 d时鞘内注射生理盐水、转染试剂或p300siRNA(siRNA 4μg溶于转染试剂)各20μl,2次/d,10μl/次,连续4 d.于术前1 d(基础状态)、术后1、3、5、7、9、11、14 d时测定机械痛阈和热痛阈;于术后3、7、14 d时取腰段脊髓,测定p300蛋白及其mRNA、乙酰化组蛋白H3(Ac-H3)的表达.结果 与基础值比较,CCI组、V组和P组术后各时点机械痛阈和热痛阈降低(P<0.05).与S组比较,其余各组机械痛阈和热痛阈降低,p300蛋白及其mRNA和Ac-H3蛋白表达上调(P<0.05).与CCI组比较,P组机械痛阈和热痛阈升高,p300蛋白及其mRNA和Ac-H3蛋白表达下调(P<0.05).结论 鞘内注射p300 siRNA可减轻大鼠神经病理性痛,其机制与抑制脊髓p300和Ac-H3蛋白的表达有关.  相似文献   

4.
目的评价鞘内转染重组腺病毒介导人神经生长因子β(Ad-hNGFβ)基因对神经病理性痛大鼠的镇痛作用。方法雄性SD大鼠96只,体重200~250 g,随机分为3组(n=32),假手术组(Ⅰ组)假手术后立即鞘内注射人工脑脊液;Ⅱ组和Ⅲ组制备坐骨神经慢性压迫性损伤(CCI)模型,术后分别立即鞘内注射人工脑脊液或Ad-hNGFβ基因。分别于术前1d(基础值)和转染后4~28 d每4天测定整体行为学评分、机械痛阈和热痛阈;每组分别于转染后4、7、14及28 d各处死8只大鼠,取脊髓组织,每个时点的4个标本用于测定hNGFβ表达(免疫组化方法),每个时点的另外4个标本用于测定hNGFβ的含量(ELISA法)。结果Ⅲ组脊髓出现hNGFβ表达;Ⅲ组脊髓hNGFβ含量高于Ⅰ组和Ⅱ组(P〈0.01);与Ⅰ组比较,Ⅱ组和Ⅲ组行为学评分升高,机械痛阈及热痛阈均降低(P〈0.05或0.01);与Ⅱ组比较,Ⅲ组行为学评分及机械痛阈差异无统计学意义(P〉0.05),转染后8~24 d热痛阈升高(P〈0.05)。结论CCI诱导的慢性神经病理性痛大鼠鞘内转染Ad-hNGFβ基因后,可在脊髓组织持续、高效表达,且能减轻热痛觉过敏,但对机械痛觉过敏无影响。  相似文献   

5.
目的 探讨鞘内注射PSD-93反义寡核苷酸对神经病理性痛大鼠脊髓神经型一氧化氮合酶(nNOS)的影响.方法 雄性SD大鼠32只,体重250~350 g,随机分为4组(n=8):假手术+生理盐水组(C组);C7脊神经压迫+生理盐水组(N组);C7脊神经压迫+PSD-93误义寡核苷酸10μg组(M组);C7脊神经压迫+PSD-93反义寡核苷酸10μg组(A组).N组、M组和A组采用60 g微血管夹压迫大鼠右侧C7脊神经15 min制备神经病理性痛模型,经枕骨大孔鞘内置管至颈膨大处.术毕当日开始给药,每日1次,连续4 d.于术前2 d(T0)、术后1、3、5和7 d(T1-4)时测定机械痛阈和热痛阈,术后7 d处死大鼠取C7段脊髓,免疫组化法检测神经压迫侧脊髓PSD-93蛋白和nNOS的表达.结果 与T0时比较,N组和M组各时点机械痛阈及热痛阈降低(P<0.05);与C组比较,N组和M组各时点机械痛阈及热痛阈降低,N组、M组和A组脊髓背角PSD-93蛋白和nNOS表达上调(P<0.05);与N组和M组比较,A组各时点机械痛阈及热痛阈升高,脊髓背角PSD-93蛋白和nNOS表达下调(P<0.05).结论 鞘内注射PSD-93反义寡核苷酸可抑制神经病理性痛大鼠脊髓nNOS表达,nNOS在神经病理性痛中的作用可能受PSD-93蛋白调节.  相似文献   

6.
鞘内注射氟代柠檬酸对神经病理性疼痛大鼠的镇痛作用   总被引:1,自引:0,他引:1  
目的通过观察鞘内注射星形胶质细胞特异性抑制剂氟代柠檬酸(FC)对神经病理性疼痛大鼠的镇痛作用,探讨脊髓星形胶质细胞在神经病理性疼痛中的作用。方法雄性SD大鼠32只,随机分为4组(n=8),A组行假手术,鞘内注射FC的溶媒;B组行假手术,鞘内注射FC;C组制作坐骨神经慢性压迫性损伤(CCI)模型,鞘内注射FC的溶媒;D组制备CCI模型,鞘内注射FC。鞘内置管后3 d,制备CCI模型,术后1 d开始行鞘内注射,1次/d(容积1μl),连续6 d,剂量为1 nmol/μl。分别于术前1 d(基础值)、术后1、3、5、7 d测定大鼠的机械痛阈和热痛阈。术后7 d测定热痛阈后立即处死大鼠,取L4.5脊髓组织,其中4只用于免疫组化实验(测定IL-6表达),另外4只用于RT-PCR实验(测定IL-6 mRNA表达)。结果CCI可导致机械痛阈和热痛阈降低,脊髓组织IL-6 mRNA和IL-6表达增加;而鞘内注射FC可在一定程度上抑制CCI导致的上述改变。结论脊髓星形胶质细胞的激活参与大鼠神经病理性疼痛的调节。  相似文献   

7.
目的 评价鞘内注射胶质细胞源性神经营养因子(GDNF)对神经病理性痛大鼠脊髓背角p38丝裂原活化蛋白激酶(p38MAPK)蛋白表达的影响.方法 取鞘内置管成功的健康雄性SD大鼠120只,周龄6周,体重180~200 g,随机分为4组(n=30):对照组(C组)、假手术组(S组)、神经病理性痛组(P组)和GDNF组.采用结扎L5.6脊神经的方法建立大鼠神经病理性痛模型.C组不给予任何处理;S组只暴露脊神经,但不结扎;P组脊神经结扎后鞘内注射生理盐水10μl,隔日1次,连续14 d;GDNF组脊神经结扎后鞘内注射GDNF 2μg,用生理盐水稀释至10μl,隔日1次,连续14 d.分别于脊神经结扎后3、7和14 d时,取10只大鼠,测定机械痛阈,然后处死,取脊髓背角,分别采用免疫组化法和蛋白质印迹法测定p38MAPK蛋白的表达水平.结果 与S组比较,P组和GDNF组机械痛阈降低,脊髓背角p38MAPK蛋白表达上调(P<0.05或0.01);与P组比较,GDNF组机械痛阈升高,脊髓背角p38MAPK蛋白表达下调(P<0.05或0.01).结论 鞘内注射GDNF可通过抑制脊髓背角p38MAPK蛋白的表达减轻大鼠神经病理性痛.  相似文献   

8.
目的 探讨鞘内注射氯胺酮对神经病理性痛大鼠吗啡耐受时脊髓背角突触重塑的影响.方法 鞘内置管成功的雄性SD大鼠48只,体重200~250 g,采用随机数字表法,将大鼠随机分为6组(n=8),置管后5 d,神经病理性痛组(NP组)、生理盐水对照组(NS组)、吗啡组(M组)、氯胺酮组(K组)和吗啡+氯胺酮组(MK组)采用背根神经节慢性压迫法制备神经病理性痛模型,假手术组(S组)仅暴露L5椎间孔.背根神经节慢性压迫后1 d NS组鞘内注射0.9%生理盐水20止,M组和K组分别给予吗啡20μg或氯胺酮50μg,MK组给予吗啡20μg+氯胺酮50μg,1次/d,连续14 d.分别于给药前(基础状态)、给药1、3、5、7、9、11、14 d时测定机械缩足阈值(PWT)和热缩足潜伏期(PWL).最后1d给药后立即处死大鼠,取脊髓组织,其中4只采用免疫组织化学方法测定脊髓背角突触数目,另外4只用于测定脊髓背角突触后膜致密物厚度.结果 与S组比较,其余5组PWT降低,PWL缩短,NP组、NS组、M组和K组突触数目和突触后膜致密物厚度增加(P<0.05);与NP组比较,M组、K组和MK组PWT升高,PWL延长,突触数目和突触后膜致密物厚度降低(P<0.05);与M组比较,MK组PWT升高,PWL延长,突触数目和突触后膜致密物厚度降低(P<0.05).结论 鞘内注射氯胺酮可抑制神经病理性痛大鼠吗啡耐受时脊髓背角突触重塑.
Abstract:
Objective To investigate the effects of intrathecal (IT) ketamine on the synapsis remodeling in the spinal dorsal horn during devolopment of morphine tolerance in a rat model of neuropathic pain (NP). Methods Male SD rats weighing 200-250 g were used in this study. IT catheter was placed in the subarachnoid space according to Yaksh. Forty-eight SD rats in which IT catheter was successfully placed were randomly divided into 6groups (n=8 each): group sham operation (group S); group NP; group normal saline 20 μl IT(group NS);group morphine 20 μg IT (group M); group ketamine 50 μg IT (group K) and group morphine 20 μ g + ketamine 50 μg IT (group MK). NP was induced by compression of right L4,5 dorsal root ganglions with steel wire inserted through L4,5 intervertebral foramen in NP,M,K and MK groups. Normal saline or morphine and/or ketamine were injected IT once a day for consecutive 14 days. Paw withdrawal threshold (PWT) to mechanical stimulation and paw withdrawal latency (PWL) to a thermal nociceptive stimulus were measured on 0, 1, 3, 5, 7, 9, 11, 14 days during the consecutive 14 days of administration. The animals were sacrificed after the final IT administration. The lumbar segment of the spinal cord was removed for determination of the number of synapsis in the spinal dorsal horn by immuno-histochemistry in 4 animals in each group and observation of synaptic structure remodeling using electron microscope in another 4 animals in each group. Results Compared with group S, PWT was significantly decreased and PWL was shortened in the other 5 groups, and the number of synapsis was significantly increased and the synaptic structure was thickened in NP, NS, M and K groups (P < 0.05). Compared with group NP,PWT was significantly increased and PWL was prolonged in M, K and MK groups, and the number of synapsis was significantly decreased and the thickness of synaptic structure was significantly reduced in group MK ( P < 0.05).Compared with group M, PWT was significantly increased, PWL was prolonged, the number of synapsis was significantly decreased and the thickness of synaptic structure was significantly reduced in group MK ( P < 0.05). Conclusion IT ketamine can inhibit the synaptic remodeling in the spinal dorsal horn during development of morphine tolerance in a rat model of NP.  相似文献   

9.
目的 探讨鞘内转染白细胞介素-10(IL-10)基因对神经病理性疼痛大鼠的镇痛作用。方法雌性SD大鼠,体重230~250g,坐骨神经压榨性损伤(CCI)后3d出现热痛觉过敏大鼠随机分为基因治疗组(pcDNA3.1-IL-10组)、真核表达载体组(pcDNA3.1组)、生理盐水组(NS组)和CCI组(n=12),前3组分别经蛛网膜下腔注射pcDNA3.1-IL-10/脂质体复合物、pcDNA3.1/脂质体复合物或生理盐水30μl,另取12只雌性SD大鼠为假手术组(Sham组),仅暴露右侧坐骨神经而不予压榨,亦不行蛛网膜下腔注射。转染后2、7、7、10、14d热辐射法测定大鼠热痛阈;RT-PCR检测转染后3d坐骨神经、腰段脊髓、海马组织IL-10mRNA的表达,ELISA法检测上述组织、血浆及转染后1-10d脑脊液中IL-10水平;细胞毒性法检测转染后14d坐骨神经、腰段脊髓、海马和血浆TNF-α水平。结果转染后2~14dCCI组热痛阈长于Sham组,而pcDNA3.1-IL-10能逆转热痛阈延长;pcDNA3.1-IL-10组转染后3d坐骨神经、腰段脊髓、海马等组织可检测到IL-10mRNA,且IL-10含量升高,脑脊液IL-10浓度在转染后1~7d升高,转染后14d坐骨神经、腰段脊髓、海马等TNF-α含量降低(P〈0.05)。结论鞘内转染IL-10能通过抑制炎症反应在一定程度上减轻大鼠神经病理性疼痛。  相似文献   

10.
目的 探讨鞘内注射PSD-93反义寡核苷酸对大鼠神经病理性痛的疗效.方法 雄性SD大鼠60只,随机分为5组(n=12):假手术组(S组)、C7脊神经压迫组(N组)、C7脊神经压迫+鞘内注射PSD-93误义寡核苷酸10 μg组(M组)、C7脊神经压迫+鞘内注射PSD-93反义寡核苷酸5 μg组(AJ组)和C7脊神经压迫+鞘内注射PSD-93反义寡核苷酸10 μg组(A2 组).N组、M组、A1组和A2组用60 g无创微血管夹压迫大鼠右侧C7脊神经15 min,制备神经病理性痛模型,经枕骨大孔鞘内置管,术毕当日开始给药,每日1次,连续4 d.于术前2 d(T0)和术后1、3、5、7 d(T1-4)测定机械痛阈和、热痛阈;T2和T4时分别处死6只大鼠,取C7脊髓,免疫组化法测定脊髓背角PSD-93蛋白表达.结果 与S组比较,N组、M组和A1组T1-4时机械痛阈及热痛阈降低,N组和M组T2,4时脊髓背角PSD-93蛋白表达上调(P<0.05);与N组和M组比较,A1组T1,2时、A2组T1~4时机械痛阈及热痛阈升高,A1组T2时、A2组T2,4时脊髓背角PSD-93蛋白表达下调(P<0.05);与A1组比较,A2组T1-4时机械痛阈及热痛阈升高,T2,4时脊髓背角PSD-93蛋白表达下调(P<0.05).结论 鞘内注射PSD-93反义寡核苷酸可减轻大鼠神经病理性痛.  相似文献   

11.
神经病理性疼痛大鼠鞘内注射SB203580的镇痛作用   总被引:3,自引:0,他引:3  
目的 观察神经病理性疼痛大鼠鞘内注射p38丝裂原活化蛋白激酶(p38MAPK)抑制剂SB203580的镇痛作用,探讨p38MAPK信号转导通路在慢性神经病理性疼痛中的作用。方法雄性SD大鼠,体重220~250g,建立坐骨神经结扎性损伤(CCI)疼痛模型,第一部分40只CCI大鼠,随机分为5组,对照组、SB0.1μg组、SB0.5μg组、SB2.5μg组和SB5μg组,(n=8),CCI后7d,鞘内注射2%二甲基亚砜或不同剂量的SB203580(0.1、0.5、2.5、5μg)10μl,在给药前和给药后0.5、3、6、12、24h用von Frey丝测定大鼠术侧后爪机械缩足反射阈值(MWT);另外36只大鼠,随机分为6组(n=6):Sham组、CCI组、DMSO组、SB0.1、0.5、5μg组,CCI后7d鞘内注射相应剂量SB203580 10μl,给药后6h取L4.5脊髓,用免疫组织化学方法检测脊髓背角磷酸化环磷酸腺苷反应元件结合蛋白(pCREB)的表达。结果CCI后大鼠产生了机械痛敏。鞘内注射SB203580剂量依赖性地提高了MWT。CCI后脊髓背角pCREB阳性神经元增加,鞘内注射SB0.5、5μg抑制了CCI引起的脊髓背角pCREB表达增加(P〈0.01)。结论鞘内注射SB203580能减轻CCI引起的痛敏,抑制脊髓背角CREB的磷酸化,p38MAPK信号通路参与慢性神经病理性疼痛。  相似文献   

12.
目的探讨鞘内注射Nav1.8反义寡核苷酸对慢性神经病理性疼痛大鼠的镇痛作用。方法雄性SD大鼠24只,随机分为4组(n=6):Ⅰ组(CCI+生理盐水组);Ⅱ组(CCI+Nav1.8错义寡核苷酸45μg组);Ⅲ组(CCI+Nav1.8反义寡核苷酸45μg组);Ⅳ组(CCI+Nav1.8反义寡核苷酸90μg组)。按Bennett法制作CCI模型,CCI5d鞘内置管,CCI8d开始鞘内给药,每日给药2次,连续5d。于CCI前2d和CCI1、3、5、7、9、11、13d测定机械痛阈和热痛阈,CCI 14d取双侧L4-6背根神经节(DRG),测定钠通道Nav1.8mRNA的表达。结果与CCI前2d前比较,Ⅰ、Ⅱ组在CCI5~13d术侧机械痛阈降低,热痛阈缩短;Ⅲ组CCI5~13d术侧机械痛阈降低,CCI3.9d热痛阈缩短,Ⅳ组CCI5—9d术侧机械痛阈降低,CCI3~7d热痛阈缩短(P〈0.05或0.01)。与Ⅰ、Ⅱ组比较,Ⅲ、Ⅳ组CCI 11、13d术侧机械痛阈增加,热痛阈延长(P〈0.05或〈0.01)。CCI14dⅢ、Ⅳ组术侧DRG中Nayl.8mRNA表达低于Ⅰ、Ⅱ组(P〈0.01),Ⅳ组DRGNay1.8mRNA表达低于Ⅲ组(P〈0.01)。结论鞘内注射45、90μg/次Nayl.8反义寡核苷酸对大鼠神经病理性疼痛有镇痛作用,90μg/次剂量效果较好,其机制是通过下调DRG中Nay1.8mRNA钠通道表达实现。  相似文献   

13.
目的 探讨神经干细胞(NSGs)移植数量对大鼠神经病理性痛的影响.方法 取出生1~3 d的SD大鼠,制备NSCs悬液.清洁级雄性SD大鼠84只,体重150~180 g,采用右侧坐骨神经半切断法制备大鼠神经病理性痛模型.采用随机数字表法,将大鼠随机分为7组(n=12),假手术组(S组):仅暴露坐骨神经,不切断,鞘内注射细胞培养液30 μl;神经病理性痛组(NP组):于模型制备后3d鞘内注射细胞培养液30 μl;NP+NSCs 103组(N1组)、NP+NSCs 104组(N2组)、NP+NSCs 105组(N3组)、NP+NSCs 106组(N4组)和NP+NSCs 107组(N5组):于模型制备后3 d,鞘内注射相应浓度的NSCs悬液.模型制备前1 d和制备后1、3.7、14和21 d时测右足机械缩足阈值(MWT)和热缩足潜伏期(TWL);于模型制备后7和21 d,痛阈测定结束后,取右侧腰膨大脊髓背角及L5背根神经节,测定脑源性神经营养因子(BDNF)mRNA及其蛋白的表达水平.结果 与S组比较,NP组和N1~5组MWT降低,TWL缩短,脊髓背角和DRG BDNF mRNA表达上调(P<0.05),BDNF阳性细胞数增多,染色加深;与NP组比较,N2~5组MWT升高,TWL延长,脊髓背角和DRG BDNF mRNA表达上调(P<0.05),BDNF 阳性细胞数增多,染色加深;模型制备后7 d N1~5组MWT依次升高,TWL依次延长,脊髓背角和DRG BDNF mRNA表达依次上调(P<0.05),BDNF阳性细胞数依次增多,染色逐渐加深;模型制备后14、21d,N1~3组MWT依次升高,TWL依次延长(P<0.05),模型制备后21 d,N1~3组脊髓背角和DRG BDNF mRNA表达依次上调,BDNF阳性细胞数依次增多,染色逐渐加深;N3~5组上述指标比较差异无统计学意义(P>0.05).结论 NSCs移植减轻大鼠神经病理性痛的适宜移植数量为105个.
Abstract:
Objective To investigate the effect of intrathecal (IT) transplantation of different quantities of neural stem cells (NSCs) on neuropathic pain (NP) in rats.Methods Eighty-four adult pathogen-free male SD rats weighing 150-180 g were randomly divided into 7 groups ( n = 12 each) : group sham operation (S group) , NP group, NP+ NSCs 103 , 104 , 105 , 106 , 107 groups (N1-5 groups) . NP was induced by partial transection of right sciatic nerve. NSCs were transplanted into subarachnoid space in N1-5 groups. Paw withdrawal threshold to mechanical stimulation (MWT) and paw withdrawal latency to nociceptive thermal stimuli (TWL) were measured at 1 day before (baseline) and 1, 3, 7, 14 and 21 days after operation. Brain derived neurotrophic factor ( BDNF) expression in spinal dorsal horn and dorsal root ganglia (DRG) was detected by immuno-histochemistry and RT-PCR on the 7th and 21st day after operation. Results Partial transection of the sciatic nerve gradually reduced MWT and TWL after operation starting from day 1 until day 7 and 14 as compared with the baseline in group NP. IT NSC transplantation significantly increased MWT and TWL and expression of BDNF in spinal dorsal horn and DRG in a dese-dependent manner at day 7 after operation in N1-5 groups as compared with group NP. There were no significant differences in MWT and TWL and BDNF expression among N3, N4 and N5 groups at day 21 after operation.Conclusion The proper quantity of transplanted NSCs which are able to ameliorate NP induced by partial transection of sciatic nerve in rats is 105 .  相似文献   

14.
目的 探讨神经病理性痛大鼠鞘内注射人前脑啡肽原(PENK)基因修饰人骨髓间充质干细胞(hMSC)的镇痛效果.方法 取鞘内置管成功的健康雄性SD大鼠40只,周龄6~8周,体重160~180 g,随机分为4组(n=10),A组为正常对照组;B组、C组和D组采用坐骨神经慢性压迫性损伤(CCI)法建立神经病理性痛模型,于CCI术后3 d鞘内给药,A组和B组鞘内注射生理盐水10μl;C组鞘内注射转染空载体的hMSC细胞(hMSC-pBABE)悬液10μl(2×108~3×108/μl);D组鞘内注射hMSC-PENK细胞悬μl液10μl(2×108~3×108个/μl).于术前、术后3、5、7、9、14 d时测定热痛阈.术后14 d痛阈测定后取新鲜脊髓组织,采用RT-PCR法测定PENK mRNA表达.结果 与术前比较,B组、C组、D组术后各时点热痛阈降低(P<0.05).与A组比较,B组、C组、D组热痛阈降低,B组和C组PENK mRNA表达下调,D组PENK mRNA表达上调(P<0.05).与B组和C组比较,D组热痛阈升高,PENK mRNA表达上调(P<0.05).B组和C组各指标比较差异无统计学意义(P>0.05).结论 大鼠鞘内注射PENK基因修饰的hMSC可减轻神经病理性痛.  相似文献   

15.
目的评价人前脑啡肽原基因(hPPE)修饰永生化大鼠神经前体细胞(INPC)对大鼠慢性神经病理性疼痛的镇痛效应。方法成年雌性Wistar大鼠40只,随机分为5组,Naive组大鼠不进行任何处理;Sham组大鼠仅暴露右侧坐骨神经分支;SNI组大鼠右侧后肢行保留性神经损伤(SNI)手术; INPC组和INPC/hPPE组大鼠分别于SNI术后1周鞘内移植5-溴脱氧尿嘧啶核苷(5-BrdU)标记的INPC或INPC/hPPE细胞。持续观察大鼠疼痛行为学,分别于SNI术前,SNI术后1周~细胞移植后8周内每周测定大鼠50%机械缩爪阈值(MWT)和热缩爪潜伏期(TWL)。于细胞移植后8周,取大鼠L_(4~6)脊髓组织,测定移植细胞5-BrdU、亮氨酸脑啡肽的表达,测定hPPE mRNA表达和亮氨酸脑啡肽的分泌。结果与Naive组比较,SNI组、INPC组SNI术后1周大鼠出现疼痛行为学改变,MWT和TWL降低,并持续到细胞移植后8周;细胞移植后1周,INPC/hPPE组大鼠痛觉异常症状明显减轻,MWT和TWL升高,到细胞移植后2周已基本恢复至正常水平。INPC组和INPC/hPPE组脊髓背角软脑膜和浅层中均可检测到5-BrdU免疫染色阳性细胞;INPC/hPPE组hPPE mRNA表达和亮氨酸脑啡肽的水平高于其它4组(P<0.05)。结论SNI诱导的慢性神经病理性疼痛大鼠鞘内移植hPPE修饰INPC后,可持续分泌高水平的亮氨酸脑啡肽,产生明显的镇痛效应。  相似文献   

16.
目的 探讨脊髓神经元型一氧化氮合酶(nNOS)在大鼠神经病理性痛中的作用.方法 健康雄性SD大鼠40只,体重220~280 g,采用结扎坐骨神经干的方法建立坐骨神经慢性压迫性损伤(CCI)模型.随机分为4组(n=10),Ⅰ组及Ⅱ组暴露坐骨神经干,分别于术后1 d开始鞘内注射选择性nNOS抑制剂7-NI 60 μg[溶于20%二甲基亚砜(DMSO)]10μl)、20%DMSO 10μl,1次/d,连续6d;Ⅲ组及Ⅳ组制备CCI模型,分别于术后1 d开始鞘内注射7-NI 60μg(溶于20%DMSO 10μl)、20%DMSO 10 μl,1次/d,连续6 d.分别于CCI前1 d、CCI后1、3、5、7 d时测定大鼠机械痛阈和热痛阈.于CCI后7 d,各组分别取5只大鼠,取术侧L_(4~6)背根神经节,分别采用实时定量PCR和Western blot法测定nNOS mRNA及蛋白的表达水平.结果 与Ⅰ组和Ⅱ组比较,T_(1~4)时Ⅲ组和Ⅳ组术侧后肢机械痛阈和热痛阈降低(P<0.05),背根神经节nNOS蛋白及mRNA的表达上调(P<0.05);与Ⅲ组比较,T_(1~4)时Ⅳ组机械痛阈和热痛阈降低,背根神经节nNOS蛋白及mRNA的表达上调(P<0.05).结论 脊髓nNOS参与了大鼠神经病理性痛的形成.  相似文献   

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