Effects of physical exercise on the functional recovery of rat hindlimbs with impairments of the sciatic nerve as assessed by 2D video analysis

[Purpose] The purpose of this study was to investigate the effects of treadmill training on functional recovery by analyzing the ankle joint as well as the knee and hip joints with 2D video analysis during gait by rats with sciatic nerve injury. [Subjects and Methods] Twenty-four male Sprague-Dawley rats were used in this study. The sham group (SG) received only a sham operation without any sciatic injury; the training group (TG) performed treadmill training for 4 weeks after sciatic injury; and the control group (CG) wasn’t provided with any therapeutic intervention after sciatic injury. [Results] The ankle, knee, and hip ROM of TG and CG during the initial, mid stance, and toe-off phases of gait at post-test were significantly different from SG. [Conclusion] Physical exercise, like treadmill training, is beneficial for the improvement of the ankle, knee and hip joints of rats with crushed sciatic nerve injury.Key words: Sciatic nerve injury, Physical exercise, 2D video analysis     

Effect of Extracorporeal Shock Wave Therapy on Denervation Atrophy and Function Caused by Sciatic Nerve Injury

[Purpose] The present study examined the effects of treatment using extracorporeal shock wave therapy (ESWT) on the muscle weight and function of the hind limb in sciatic nerve injury. [Subjects] Forty rats with sciatic nerve crushing injury were randomly divided into two groups: an ESWT group (n=20), and a control group (n=20). [Methods] The ESWT group received extracorporeal shock wave treatment, and the control group did not receive any treatment after injury. Experimental animals were measured for muscle weight on an electronic scale and were tested for function on a sciatic functional index (SFI). [Results] All groups showed significant increases in the weights of the left soleus and gastrocnemius muscles, and decreases in the weights of the right soleus and gastrocnemius muscles (p<0.05). Comparison of SFI scores and muscle weights between the groups showed significant differences in SFI scores, and the right soleus and gastrocnemius muscles (p<0.05) [Conclusion] Exercise programs that use ESWT can be said to be effective at improving the function of the sciatic nerve and preventing the denervation atrophy.Key words: ESWT, Sciatic nerve, Peripheral nerve     

The effect of weight-bearing exercise and non-weight-bearing exercise on gait in rats with sciatic nerve crush injury

[Purpose] The purpose of this study was to access the effect of weight bearing exercise (treadmill exercise) and non-weight-bearing exercise (swimming exercise) on gait in the recovery process after a sciatic nerve crush injury. [Subjects and Methods] Rats were randomly divided into a swimming group (n=3) with non-weight-bearing exercise after a sciatic nerve crush and a treadmill group (n=3) with weight bearing exercise after a sciatic nerve crush. Dartfish is a program that can analyze and interpret motion through video images. The knee lateral epicondyle, lateral malleolus, and metatarsophalangeal joint of the fifth toe were marked by black dots before recording. [Results] There were significant differences in TOK (knee angle toe off) and ICK (knee angle at initial contact) in the swimming group and in TOK, ICA (ankle angle at initial contact), and ICK in the treadmill group. In comparison between groups, there were significant differences in TOA (ankle angle in toe off) and ICA at the 7th day. [Conclusion] There was no difference between weight bearing and non-weight-bearing exercise in sciatic nerve damage, and both exercises accelerated the recovery process in this study.Key words: Sciatic nerve crush injury, Weight-bearing exercise, Gait     

Effects of the Nerve Mobilization Technique on Lower Limb Function in Patients with Poststroke Hemiparesis

[Purpose] The purpose of the study was to determine the effects of a sciatic nerve mobilization technique on improvement of lower limb function in patient with poststroke hemiparesis. [Subjects] Twenty- two stroke patients participated in this study. [Methods] They were randomly selected based on selection criteria and divided into two groups. In the subject group (n=10), sciatic nerve mobilization with conventional physical therapy was applied to patients. In the control group (n=10), only conventional physical therapy was applied to stroke patients. [Results] There were significant differences between the two groups in pressure, sway, total pressure, angle of the knee joint, and functional reaching test results in the intervention at two weeks and at four weeks. [Conclusion] The present study showed that sciatic nerve mobilization with conventional physical therapy was more effective for lower limb function than conventional physical therapy alone in patient with poststroke hemiparesis.Key words: Sciatic nerve mobilization, Foot pressure, Knee joint angle     

Effects of Pulsed Electromagnetic Field and Swimming Exercise on Rats with Experimental Sciatic Nerve Injury

[Purpose] The current study aimed to reveal the therapeutic effects of a pulsed electromagnetic field and swimming exercises on rats with experimental sciatic nerve injury, which was induced with crush-type neuropathy model damage, using electrophysiological methods. [Subjects] In the current study, the sample consisted of 28 adult male Wistar albino rats. [Methods] The rats were randomized into four groups (n=7). Swimming exercise and PEMF (2 Hz and 0.3 MT) were applied one hour a day, five days a week, for four weeks. Electroneuromyographic (ENMG) measurements were taken on day 7. [Results] When the data were evaluated, it was found that the 4 weeks of PEMF and swimming exercises led to an increase in motor conduction rates and a decrease in latency values, but the changes were not significant in comparison with the control and injury groups. The compound muscle action potential (CMAP) values of the left leg were lower in weeks 2, 3, and 4 in the swimming exercise group in comparison with the control group, although for the PEMF group, the CMAP values of the left leg reached the level observed in the control group beginning in week 3. [Conclusion] PEMF and swimming exercise made positive contributions to nerve regeneration after week 1, and regeneration was enhanced.Key words: Pulsed electromagnetic field, Swimming exercise, Nerve regeneration     

Effect of exercise on the expression of nerve growth factor in the spinal cord of rats with induced osteoarthritis

[Purpose] We examined the impact of exercise on the expression pattern of nerve growth factor in the spinal cord of rats with induced osteoarthritis of the knee joint. [Subjects and Methods] To produce monosodium iodoacetate-induced arthritis, rats were administered 3 mg/50 µL monosodium iodoacetate through the interarticular space of the right knee. The animals were randomly divided into four groups: rats sacrificed 3 weeks after 0.9% saline solution injection (shame group, n = 10), rats sacrificed 3 weeks after monosodium iodoacetate injection (control group, n = 10), rats with 4 weeks rest from 3 weeks after monosodium iodoacetate injection (no exercise group, n = 10), and rats with 4 weeks treadmill training from 3 weeks after monosodium iodoacetate injection (exercise group, n = 10). Serial coronal sections of the lumbar spine were cut and processed for immunohistochemistry. [Results] The expression of nerve growth factor was significantly increased in the EG compared with the SG, CG, and NEG. [Conclusion] Increased nerve growth factor expression in the spinal cord due to exercise-induced stimulation can be effective in treating chronic pain. Such treatment will contribute not only to improving the joint function of patients with chronic pain but also their quality of life.Key words: Osteoarthritis, Treadmill exercise, Nerve growth factor     

Influence of ROM Exercise on the Joint Components during Immobilization

[Purpose] The aim of this study was to clarify the effects of the ROM exercise on joint components according to histopathological analysis. [Subjects and Methods] In total, twenty-six 9-week-old adult male Wistar rats were used in this study. The rats were randomly divided into three groups, the immobilization group (n=10), exercise group (n=10), and control group (n=6). The immobilization group and exercise group were anaesthetized and operated on under sterile conditions. The right knee joints in the immobilization group and exercise group were immobilized with external fixation at 120 degrees of flexion. Range of motion exercise was started from the day after immobilization. ROM exercise was performed in the exercise group once a day for 3 minutes, 6 days a week, for 2 weeks. [Result] The joint capsule in the immobilization group and exercise group showed narrowing of the collagen bundles in interstitial spaces but was less dense in the control group. In the immobilized group, a hyperplastic reaction was associated with infiltration into the articular cavity and adhesion to the surface of the articular cartilage. Conversely, in the exercise group, hyperplasia of tissue was localized to the synovial membrane. [Conclusion] This finding may suggest that ROM exercise induces some changes within the joint components and tissue metabolism.Key words: Joint immobilization, Contracture, ROM exercise     

Efficacy of multi-wave locked system laser therapy on nerve regeneration after crushing in Wister rats

[Purpose] To investigate the efficacy of the multi-wave locked system laser therapy on the regeneration of peripheral nerve injuries by evaluating the functional, electrophysiological, and morphological changes of the crushed sciatic nerve in Wistar rats. [Materials and Methods] Sixty male Wistar rats (200–250 g) were randomly assigned to control negative, control positive, or laser groups and subjected to no laser therapy or crushing, to crushing without laser therapy, or crushing followed by multi-wave locked system laser therapy five times/week for four weeks (power=1 W, energy density=10 J/cm², total energy=100 J), respectively. Functional, electrophysiological, and morphometric analyses were performed before and 7, 15, 21, and 28 days after crushing. The sciatic functional index, compound motor action potential amplitude, motor nerve conduction velocity, and nerve and myelin sheath diameters were measured. [Results] The sciatic functional index value decreased significantly, while the compound motor action potential amplitude, motor nerve conduction velocity, nerve diameter, and myelin sheath diameter increased significantly in the laser group post-treatment compared to the values in the control groups. [Conclusion] Multi-wave locked system laser therapy was effective in accelerating the regeneration of crushed sciatic nerves in Wistar rats.     

烟酰胺腺嘌呤二核苷酸磷酸氧化酶4阻断剂对糖尿病神经病变大鼠坐骨神经凋亡的影响

目的探讨糖尿病周围神经病变(DPN)大鼠坐骨神经烟酰胺腺嘌呤二核苷酸磷酸氧化酶4(Nox4)表达改变及Nox4阻断剂VAS2870对DPN大鼠坐骨神经凋亡的影响。 方法40只8周龄雄性SD大鼠,平均体重( 203.5±6.4)g,30只大鼠一次性腹腔注射链脲佐菌素(STZ),其中20只患糖尿病,余10只大鼠淘汰;其余大鼠腹腔注射等体积柠檬酸溶液作为对照组(n＝10)。8周后糖尿病大鼠建立DPN模型,采用随机数字表法将DPN大鼠分为2组,VAS2870组(n＝10,尾静脉注射VAS2870 1 mg/kg,每日1次,共7 d)和DPN组(n＝10,尾静脉注射等体积0.9%无菌NaCl溶液,每日1次,共7 d)。用PowerLab数据记录分析系统检测坐骨神经运动神经传导速度(MNCV)和感觉神经传导速度(SNCV),用荧光实时定量聚合酶链反应(PCR)检测坐骨神经Nox4、半胱氨酸天冬酶-3(caspase-3)、B细胞淋巴瘤因子-2(Bcl-2)、Bcl-2相关X蛋白(Bax)mRNA表达,用蛋白印迹检测坐骨神经Nox4、caspase-3、Bcl-2、Bax蛋白表达水平,采用单因素方差分析比较各组间的差异,用Tukey检验进行两两比较。 结果DPN大鼠坐骨神经MNCV[(41.21±7.36)m/s]及SNCV[(30.39±7.66)m/s]均低于VAS2870组[(49.14±8.67)m/s,(38.95±6.24)m/s],VAS2870对MNCV及SNCV的下降具有减轻作用(q＝3.58,4.53;均P<0.05)。DPN大鼠坐骨神经Nox4(4.72±0.42)、caspase-3(5.02±0.43)、Bax(5.63±0.82) mRNA(q＝7.02,6.40,7.65;均P<0.05)及蛋白水平(0.86±0.10,0.78±0.17,0.95±0.13,q＝7.83,9.15,6.87;均P<0.05)较对照组mRNA(5.79±0.53,6.90±0.79,7.39±0.67)及蛋白水平(0.59±0.13,0.45±0.14,0.64±0.14)表达上调,Bcl-2 mRNA(6.81±0.60,q＝6.31,P<0.05)及蛋白水平(0.44±0.12,q＝6.20,P<0.05)表达下调。VAS2870组Nox4、caspase-3、Bax mRNA(5.31±0.44,5.71±0.60,6.41±0.95)(q＝3.66,2.98,4.02,3.38;均P<0.05)及蛋白水平(0.72±0.13,0.60±0.18,0.79±0.15)(q＝4.24,5.78,3.83;均P<0.05)均低于DPN组,Bcl-2 mRNA(6.29±0.47)的及蛋白水平(0.56±0.12)表达均高于DPN组(q＝3.38,2.81;均P<0.05),VAS2870部分逆转了Nox4、caspase-3、Bax、Bcl-2 mRNA及蛋白的表达水平。 结论DPN大鼠坐骨神经Nox4表达水平增高,通过调节凋亡相关蛋白caspase-3、Bax及Bcl-2表达促进坐骨神经凋亡;Nox4阻断剂通过减轻坐骨神经凋亡发挥恢复DPN大鼠坐骨神经传导速度的作用。     

应用人工神经修复大鼠坐骨神经损伤的实验研究

目的观察应用复合碱性成纤维细胞生长因子(bFGF)-壳聚糖导管修复大鼠周围神经损伤的效果。方法成年Wistar大鼠25 只分为假手术组(n=10)、单纯损伤组(n=5)和人工神经修复组(n=10)。假手术组仅暴露坐骨神经5 mm,单纯损伤组暴露坐骨神经并切断,人工神经修复组以复合bFGF-壳聚糖导管桥接缺损。术后对实验动物的坐骨神经进行大体观察,对运动进行行为观察,以及组织化学和免疫组织化学方法评价神经再生情况和靶肌肉恢复情况。结果术后5 周,与单纯损伤组相比,人工神经修复组运动功能有一定程度恢复。人工神经修复组再生的坐骨神经已经通过bFGF-壳聚糖导管越过缺损并与远端相连接。免疫组织化学方法显示,坐骨神经再生段可观察到神经微丝(NF)阳性和S-100 阳性纤维。应用Masson 染色方法,可观察到人工神经修复组腓肠肌去纤维化程度相对于单纯损伤组有明显改善。结论应用bFGF-壳聚糖导管能有效修复周围神经损伤并使大鼠运动功能得到改善。     

The Variation of Cross-Sectional Area of the Sciatic Nerve in Flexion-Distraction Technique: A Cross-Sectional Study

ObjectiveThe purpose of this study was to compare the cross-sectional area of the sciatic nerve in different positions of spinal manipulation using flexion-distraction technique.MethodsThirty healthy participants were assessed in 6 different flexion-distraction technique positions of varying lumbar, knee, and ankle positions. Participants stood in the following 3 positions with the lumbar in the neutral position: (A) with knee extended, (B) with knee flexed, and (C) with the knee extended and ankle dorsiflexion. Participants then stood in the following 3 positions with the lumbar flexed: (D) with the knee extended, (E) with the knee flexed, and (F) with knee extended and ankle dorsiflexion. The cross-sectional area (CSA) of the sciatic nerve was measured with ultrasound imaging in transverse sections in the posterior medial region of the left thigh. The CSA values measured at each position were compared.ResultsWe analyzed 180 ultrasound images. The cross-sectional area of the sciatic nerve (in mm²) in position B (mean; standard deviation) (59.71-17.41) presented a higher mean cross-sectional area value compared with position D (51.18-13.81; P =.005), position F (48.71-15.16; P = .004), and position C (48.37-16.35; P = .009).ConclusionThe combination of knee extension and ankle dorsiflexion reduced the CSA of the sciatic nerve, and flexing the knee and keeping the ankle in the neutral position increased it.     

术前给予巴氯酚延迟坐骨神经松结扎神经病理痛的形成

目的研究术前鞘内注射GABAB受体激动剂巴氯酚(Bac)对慢性神经病理痛大鼠痛阈的影响,探讨脊髓GABA能系统在神经病理痛调节中的作用。方法建立慢性坐骨神经结扎损伤模型(CCI),SD大鼠32只随机分成4组:假手术组,大鼠左侧坐骨神经分离,但不结扎,术前鞘内注射生理盐水10μL;神经结扎组,大鼠左侧坐骨神经松结扎,术前鞘内注射生理盐水10μL;Bac 1组,大鼠左侧坐骨神经松结扎前10 min,鞘内注射Bac 0.03μg;Bac 2组,大鼠左侧坐骨神经松结扎前10min,鞘内注射Bac 0.3μg。术后第1、3、5、7、10、14天测大鼠机械刺激缩足反射阈值(MWT)和热刺激缩足反射潜伏期(TWL)以及运动功能。结果术后第1~14天神经结扎组大鼠MWT和TWL较假手术组大鼠明显降低(P<0.05);术前给Bac 0.3μg的坐骨神经结扎大鼠与术前给生理盐水的坐骨神经结扎大鼠比较,术后第1~5天MWT和TWL明显升高(P<0.05)。结论坐骨神经结扎前鞘内注射Bac 0.3μg可延缓大鼠神经病理性疼痛的形成。     

Alcohol neurolysis of the sciatic nerve in the treatment of hemiplegic knee flexor spasticity: clinical outcomes

OBJECTIVE: To study clinical outcomes after 50% to 100% alcohol neurolysis of the sciatic nerve in the treatment of chronic hemiplegic knee flexor spasticity. DESIGN: Case series using a convenience sample. SETTING: Rehabilitation teaching hospital. PATIENTS: Eight patients (mean age, 55.1 +/- 12.1 yr; mean duration to block, 4.4 +/- 3.7 mo) with chronic hemiplegia and severe spasticity (modified Ashworth scale [MAS] score < 2) secondary to cerebrovascular accidents (n = 5) and traumatic brain injuries (n = 3). Two patients were ambulant, 6 were wheelchair-bound. INTERVENTIONS: Fifty percent to 100% alcohol neurolysis of the sciatic nerve using repetitive electric stimulation to localize the sciatic nerve. MAIN OUTCOME MEASURES: MAS score, gain in knee range of motion (ROM), and visual inspection of gait at 0, 1, and 6 months postneurolysis. Nonparametric tests were used in statistical analysis. RESULTS: The mean preinjection MAS score was 2.8 +/- 0.7, which improved to 1.4 +/- 0.7 at 1 month (p = .005), and 1.8 +/- 0.9 (p = .01) and 1.9 +/- 1.1 (p = .02) at 3 and 6 months postinjection, respectively. The mean gain in knee ROM was 34.4 degrees +/- 15.7 degrees at 1 month postinjection and was maintained at 6 months postinjection. Improvements in gait were noted in both ambulant patients, and improved positioning in 3 of 6 wheelchair-bound patients. The incidence of dysesthetic pain was 0%. CONCLUSION: Fifty percent to 100% alcohol neurolysis of the sciatic nerve is a safe and effective method for treatment of hemiplegic knee flexor spasticity, with therapeutic effects lasting 6 months.     

经皮电刺激对慢性神经卡压治疗效果的实验研究

目的观察经皮电刺激在大鼠坐骨神经慢性卡压中的应用效果。方法用40只大白鼠采用Mackinnon所设计的大鼠坐骨神经卡压模型,在卡压20周后,分成4组进行实验A组不减压组;B组减压组;C组减压＋电刺激组;D组仅做电刺激组。结果C组电生理与病理检测指标明显优于其他各组。结论神经减压＋电刺激的治疗效果理想。     

碱性成纤维细胞生长因子对大鼠神经损伤后肌肉的影响

目的研究碱性成纤维细胞生长因子(bFGF)对大鼠坐骨神经钳夹损伤后小腿三头肌的保护作用。方法42只大鼠随机等分成6组,钳夹对照:4周组(C4),8周组(C8),12周组(C12);bFGF用药:4周组(F4),8周组(F8),12周组(F12)。手术暴露坐骨神经,外科止血钳钳夹坐骨神经。实验组夹伤后即刻于损伤处神经干内分别注射bFGF,对照组注射等量生理盐水,术后在术侧腓肠肌注射药物,1次/d,直到实验结束。分别存活4,8,12周时,进行足印分析及坐骨神经功能指数(sciaticnervefunctionindex,SFI)测定实验;随后麻醉动物,20g/L多聚甲醛和12.5g/L戊二醛,经心灌注固定,切取小腿三头肌,称重,后取其中段,石蜡包埋、切片,光镜下测量小腿三头肌的横截面直径。结果大鼠坐骨神经钳夹损伤后各组之间小腿三头肌质量比结果不同,C4组0.708±0.015,F4组0.763±0.035,t=1.6,P<0.01;C8组0.903±0.032,F8组0.963±0.013,t=5.0,P<0.01;C12组0.920±0.073,F12组0.980±0.014,t=16.7,P<0.01。肌纤维直径不同,正常侧(15.2±0.6)μm,C4组(10.8±0.9)μm,F4组(12.2±0.7)μm,t=6.7,P<0.01,C8组(11.1±0.1)μm,F8组(13.5±0.9)μm,t=10.2,P<0.01,C12组(13.1±0.8)μm,F12组(14.2±1.0)μm,t=4.8,P<0.01,组间差异具有显著性意义。结论大鼠坐骨神经钳夹损伤后,bFGF能     

超短波对大鼠坐骨神经损伤后神经传导速度及其损伤运动神经元内VEGF表达的影响

目的研究超短波治疗对大鼠坐骨神经钳夹伤后神经传导速度(MCV)及其相应水平脊髓运动神经元内血管内皮生长因子(VEGF)表达的影响。方法选取60只SD大鼠,钳夹其坐骨神经制作周围神经损伤模型,然后随机分为实验组、对照组各24只和假手术组12只。实验组术后对其坐骨神经钳夹伤处进行超短波辐射。对照组术后进行无效辐射。假手术组仅暴露单侧坐骨神经。三组大鼠分别于术后1、2、4和6周末采用电生理及免疫组织化学染色方法观察超短波治疗对大鼠坐骨神经MCV及其L_4～5脊髓运动神经元VEGF阳性染色颗粒及吸光度水平的变化。结果术后1周,实验组和对照组大鼠损伤侧坐骨神经MCV值均未测出,术后2周起实验组和对照组大鼠损伤侧坐骨神经MCV值可测出,且超短波治疗组大鼠术后2、4、6周其损伤侧坐骨神经MCV值均明显高于对照组(P<0.05)。超短波治疗组大鼠L_4～5脊髓运动神经元VEGF阳性染色颗粒平均积分吸光度值(IOD)在术后各同一时间点均高于对照组(P<0.05)。结论超短波能促进大鼠周围神经损伤后MCV的恢复,增加其损伤脊髓运动神经元中VEGF的表达,改善组织缺血缺氧,对大鼠坐骨神经钳夹伤后神经的修复起保护作用。     

鞘内注射姜黄素对坐骨神经结扎损伤大鼠的影响

【目的】探讨姜黄素对神经病理性痛（NP）大鼠疼痛行为及大鼠脊髓背角NMDA2B受体表达的影响及作用机制。【方法】将雄性SD大鼠鞘内置管后制作坐骨神经慢性压迫性损伤（CCI）模型,取75只随机分为5组（n=15）实验对照组、假手术组、溶剂对照组、姜黄素100组及姜黄素500组。测定大鼠术侧机械痛阚值和热痛阈值。在术后d3、d7、d14分批处死大鼠（n=5）,用免疫组织化学法测定NMDA2B受体在脊髓背角神经元的动态变化。【结果】大鼠术侧脊髓背角浅层内NMDA2B阳性神经元明显增多,姜黄素可减轻NP大鼠的疼痛行为,也能够明显减少脊髓背角神经元中NMDA2B表达。【结论】鞘内注射姜黄素可剂量依赖性缓解CCI大鼠NP,其机制可能与降低NMDA2B受体的表达有关。     

The Morphological Changes in the Capillary Architecture of the Tibial Nerve Associated with Spontaneous Aging and Aerobic Exercise Intervention during Aging in Rats

[Purpose] Peripheral nerve degradation associated with aging is linked to failure of interactions in capillary metabolism. The aim of this study was to morphologically investigate the age-related changes in the capillary architecture of the tibial nerve in spontaneous aging and with aerobic exercise intervention in rats. [Subjects] Male Sprague-Dawley rats (n=15) were used in the present study. [Methods] The rats were divided into control (Cont, n=5), elderly (Elder, n=5), and elderly with aerobic exercise (Elder+Ex, n=5) groups. Aerobic training of low intensity was performed for 10 weeks using a treadmill starting at 96 weeks of age by the Elder+Ex group. The capillary diameter, cross-sectional area and number of microvascular ramifications in the tibial nerve were compared among the Cont (20-week-old), Elder (106-week-old) and Elder+Ex groups using three-dimensional images gained from confocal laser scanning microscopy. [Results] The capillary diameter, cross-sectional area and number of microvascular ramifications in the Elder group were significantly smaller than those observed in the Cont and Elder+Ex groups. [Conclusion] These findings suggest that the capillaries in the peripheral nerve degrade with spontaneous aging and that aerobic exercise of low intensity promotes angiogenesis, and protects the capillary from oxidative stress.Key words: Capillary, Tibial nerve, Three-dimensional image     

坐骨神经损伤模型大鼠神经传导速度及损伤运动神经元内生长相关蛋白43表达与磁刺激干预

背景:磁刺激可促进损伤神经的修复。目的:观察磁刺激对大鼠损伤坐骨神经神经传导速度及相应水平脊髓运动神经元内生长相关蛋白43表达的影响。方法:将60只SD大鼠随机分为实验组(n=24)、模型组(n=24)和假手术组(n=12),用一新的长17cm的止血钳钳夹坐骨神经至第二扣,以21.95×103Pa维持10s制备损伤模型。造模后24h,实验组每天给予0.09T的磁刺激。结果与结论:造模后第2,4,8,12周,免疫组织化学染色显示实验组脊髓L4～5运动神经元生长相关蛋白43的表达较模型组相应时间点明显增高(P<0.05);造模后12周,电生理检测发现,与模型组比较,实验组再生神经传导速度加快,波幅升高,潜伏期缩短(P<0.05)。说明磁刺激能提高损伤坐骨神经的传导速度,增加其对应脊髓节段运动神经元中生长相关蛋白43的表达,对大鼠损伤坐骨神经的修复起促进作用。     

被动运动与电刺激失用性骨质疏松症大鼠模型神经生长因子基因的表达

背景：研究显示,被动运动与电刺激均能减缓失用性骨质疏松的症状,对骨代谢有改善作用。目的：探讨神经生长因子在失用性骨质疏松形成中的影响地位及预防过程的作用机制。方法：将50只SD大鼠按等体质量原则随机分为假手术组,坐骨神经切除组,坐骨神经切除＋被动运动组（简称被动运动组）,坐骨神经切除＋电刺激组（简称电刺激组）,坐骨神经切除＋被动运动＋电刺激组（简称联合干预组）,每组10只。造模各组大鼠均行坐骨神经及股神经切断术（神经切断5mm）,手术后24h,开始作被动运动、电刺激等治疗。假手术组与其余4组手术路径相同,但不切除坐骨神经与股神经。结果与结论：①电刺激组、联合干预组体质量高于坐骨神经切除组,差异有非常显著性意义（P〈0.01）。②实时荧光定量PCR检测坐骨神经切除组神经生长因子表达低于假手术组,差异有显著性意义（P〈0.05）;坐骨神经切除组低于电刺激组和被动运动组,差异有显著性意义（P〈0.05）;联合干预组高于坐骨神经切除组,差异有非常显著性意义（P〈0.01）。结果提示：①经过电刺激和被动运动干预后,大鼠胫骨组织中内源性神经生长因子基因表达水平显著提高。②提高骨组织中神经生长因子基因的表达是预防骨质疏松的重要机制之一,适宜的电刺激与被动运动均能促进这一过程。