Protective Effect and Potential Mechanism of Ginkgo biloba Extract EGb 761 on STZ‐induced Neuropathic Pain in Rats

Diabetes induced neuropathic pain is recognized as one of the most difficult types of pain to treat with conventional analgaesics. EGb 761 is a standardized extract of Ginkgo biloba that has analgaesic and antiinflammatory properties and modulatory effects on key pain‐related molecules. We examined the effect of EGb 761 on streptozotocin (STZ)‐induced neuropathic pain behaviours and assessed its mechanism of action. Streptozotocin (20 mg/kg i.p for 5 days) was administered to induce experimental diabetes. Pain hypersensitivity to radiant heat was measured using the Dynamic Plantar Aesthesiometer to test the pain threshold. Diabetic rats exhibited mechanical allodynia and thermal hyperanalgaesia after the third week of STZ injection and concomitantly increased thiobarbituric acid reactive substance and nitric oxide concentration. The antioxidant enzymes level of superoxide dismutase and catalase was markedly reduced in STZ‐diabetic rats (p < 0.05). Systemic administration of EGb 761 (25, 50 and 100 mg/kg), starting after the third week following STZ injection, dose‐dependently reversed STZ‐induced thermal hyperanalgaesia and mechanical allodynia. Moreover, it reduced oxidonitrosative stress and concomitantly restored the level of antioxidant enzymes (p < 0.05) as compared with untreated diabetic rats. These results suggest that EGb 761 attenuated STZ‐induced neuropathic pain behaviours by inhibiting oxidative and nitrosative stress and may constitute a new approach for treatment of painful diabetic neuropathy. Copyright © 2012 John Wiley & Sons, Ltd.     

Ginsenoside Rf relieves mechanical hypersensitivity,depression‐like behavior,and inflammatory reactions in chronic constriction injury rats

The aim of this study was to investigate whether ginsenoside Rf can effectively relieve pain hypersensitivity in a neuropathic pain rat model. Neuropathic pain was induced in rats by chronic constriction injury (CCI) to the right sciatic nerve. Ginsenoside Rf was administered intraperitoneally after CCI surgery. The von Frey filament test and forced swimming test were performed to examine pain hypersensitivity and depression‐like behavior in rats. Western blot was used to measure the levels of inflammatory cytokines in the dorsal root ganglion (DRG) and the spinal cord. Pretreatment of ginsenoside Rf for 7 days did not affect the onset of mechanical allodynia in CCI rats; however, a single dose of ginsenoside Rf 1 day after surgery attenuated established mechanical allodynia in CCI rats. Additionally, chronic treatment of ginsenoside Rf 1 week before and 2 weeks after CCI surgery diminished mechanical allodynia and depression‐like behavior without affecting spontaneous locomotor activity in CCI rats. Furthermore, in CCI rats, chronic ginsenoside Rf treatment partially reversed the upregulation of proinflammatory cytokines in the spinal cord and/or the DRG but elevated IL‐10, an anti‐inflammatory factor, in the DRG. Ginsenoside Rf alleviated neuropathic pain and its associated depression and restored the balance between proinflammatory and anti‐inflammatory cytokines. Our results suggest that ginsenoside Rf may be a potential therapy for nerve injury‐induced neuropathic pain.     

Pain-relieving effects of processed Aconiti tuber in CCI-neuropathic rats

Neuropathic pain is often refractory to conventional pain therapies and thus requires exploration of effective drugs. We evaluated if processed Aconiti tuber (PAT), a traditional oriental herbal medicine that has been used as an analgesic, relieves neuropathic pain in the rat chronic constriction injury (CCI) model. Ten to 14 days after CCI in the right hind paw, six groups of rats received oral placebo, or PAT at 0.5, 1, 2, 3, or 5 g/kg. Additional groups received oral PAT, 2 g/kg, after pretreatment with intraperitoneal naloxone; intraperitoneal nor-binaltorphimine (norBNI); or intrathecal norBNI. As indicators of mechanical allodynia and thermal hyperalgesia, the pressure threshold of paw withdrawal (PWT) in response to linearly increasing pressure, and latency to paw withdrawal (PWL) in response to radiant heat, were measured before and after drug administration. Oral PAT dose-dependently increased PWT and PWL, which had been decreased due to CCI. The increases in PWT and PWL by oral PAT were inhibited by intraperitoneal and intrathecal norBNI: a selective kappa-opioid receptor antagonist, but not by intraperitoneal naloxone. These results indicate that oral PAT can alleviate mechanical allodynia and thermal hyperalgesia, dose-dependently, via spinal kappa-opioid receptor mechanisms in a rat CCI neuropathic pain model.     

电针降低神经病理性疼痛大鼠脊髓白细胞介素-6的表达

目的:观察电针对神经病理性疼痛大鼠脊髓白细胞介素-6(IL-6)蛋白表达以及痛敏状态的影响,探讨电针治疗神经病理性疼痛的可能机制。方法:雄性SD大鼠24只,分为假手术组、手术组和电针治疗组。采用大鼠坐骨神经慢性压迫性损伤(CCI)模型,电针“委中”与“环跳”穴,观察其对大鼠机械性痛阈和热痛阈的影响,并应用免疫组化技术观察大鼠脊髓IL-6的变化。结果:假手术组大鼠脊髓IL-6免疫阳性细胞平均光密度值为0.1361±0.0113,CCI手术可以显著降低大鼠痛阈,并且大鼠手术侧脊髓IL-6免疫阳性细胞平均光密度值增加(0.5152±0.0372),而电针治疗后则明显抑制大鼠脊髓IL-6蛋白(0.3527±0.0379)的表达,并显著减轻CCI大鼠的痛敏状态。结论:电针治疗神经病理性疼痛可能与下调脊髓IL-6的表达有关。     

The Effect of Verbascoside in Neuropathic Pain Induced by Chronic Constriction Injury in Rats

We examined the effects of verbascoside in rats subjected to chronic constriction injury (CCI). Verbascoside (50, 100, and 200 mg/kg, i.p.), was administered from the day of surgery for 14 days. Spinal cord levels of apoptotic factors and glia markers were quantified on days 3, 7, and 14 post‐CCI. Oxidative stress markers were assessed on days 7 and 14. CCI rats exhibited a marked mechanical allodynia, cold allodynia, and thermal hyperalgesia on days 3, 5, 7, 10, and 14 post‐CCI. A significant increase in the levels of Iba (a marker of microglia activation) and Bax (a proapoptotic factor) was observed on day 3. Iba remained high on day 7. In contrast, there were no differences in glial fibrillary acidic protein contents between sham and CCI animals. Malondialdehyde increased and reduced glutathione decreased on day 14. Verbascoside significantly attenuated behavioral changes associated with neuropathy. Bax decreased, while Bcl‐2 was increased by verbascoside on day 3. Verbascoside also reduced Iba protein on days 3 and 7. The results support evidence that microglial activation, apoptotic factors, and oxidative stress may have a pivotal role in the neuropathic pain pathogenesis. It is suggested that antinociceptive effects elicited by verbascoside might be through the inhibition of microglia activation, apoptotic pathways, and antioxidant properties. Copyright © 2015 John Wiley & Sons, Ltd.     

累加电针提高神经痛大鼠背根神经节GDNF mRNA的表达

目的观察累加电针对神经痛大鼠背根神经节(ORG)中胶质细胞源性神经营养因子(GONF)mRNA表达的影响。方法实验分为3组,对照组为正常大鼠,神经痛组为大鼠坐骨神经慢性限制性损伤(CCI)致神经痛模型,神经痛 电针组为术后第7d起隔日给予神经痛大鼠累加电针治疗。各组动物处死后,取L4-L6 DRG,冰冻切片,采用原位杂交的方法,观察累加电针对神经痛大鼠DRG中GDNF mRNA表达的影响。结果大鼠坐骨神经结扎后出现显著热痛敏,累加电针能明显抑制神经痛大鼠热痛敏;CCI诱发神经痛后,大鼠DRG中GDNF mRNA表达明显增高,累加电针可以使其进一步增高。结论实验提示内源性GDNF可能参与累加电针对大鼠神经痛的治疗作用。     

Anti-hypersensitivity effects of Shu-jing-huo-xue-tang, a Chinese herbal medicine, in CCI-neuropathic rats

Aim of the study

Shu-jing-huo-xue-tang (SJHXT) (Japanese name: Sokei-kakketu-to), a traditional Chinese herbal medicine composed of 17 crude drugs, has been prescribed over hundreds of years for treatment of chronic pain syndromes. We evaluated if oral SJHXT could suppress neuropathic pain behaviors in rats with chronic constriction injury (CCI) of the sciatic nerve.

Materials and methods

(1) Rats received repeated oral SJHXT 0.5 or 1.0 g/kg once daily for 14 days starting 24 h after CCI surgery, while neuropathic manifestations were evaluated until day 20 post-CCI. (2) Other groups of rats received single oral SJHXT 1.0 g/kg on day 14 post-CCI. (3) Additional groups of rats received oral SJHXT 1.0 g/kg on day 14 post-CCI, concomitantly with intraperitoneal yohimbine 1 mg/kg or methysergide 5 mg/kg. Neuropathic manifestations, including mechanical allodynia and thermal hyperalgesia, were evaluated with paw withdrawal responses to increasing mechanical pressure and radiant heat, respectively.

Results

Mechanical allodynia and thermal hyperalgesia developed by day 14 post-CCI. Repeated oral SJHXT for 14 days produced anti-allodynic and anti-hyperalgesic effects that outlasted the period of drug administration. Single oral SJHXT on day 14 also produced significant anti-allodynic and anti-hyperalgesic effects, which were inhibited by yohimbine, an alpha-2 adrenoceptor antagonist, but not by methysergide, a serotonin receptor antagonist.

Conclusions

Oral SJHXT produced anti-hypersensitivity effects by actions on alpha-2 adrenoreceptors in CCI-neuropathic rats, and chronic oral administration of SJHXT could produce the long-lasting anti-hypersensitivity effects.     

电针对神经病理性疼痛大鼠脊髓胶质纤维酸性蛋白活性及肿瘤坏死因子-α和白介素-1β表达的影响

目的:观察电针治疗神经病理性疼痛大鼠对脊髓背角胶质纤维酸性蛋白(GFAP)的活化以及促炎性细胞因子TNF-α(肿瘤坏死因子-α)和IL-1β(白介素-1β)表达的影响。方法:72只SD大鼠随机分为3组:假手术组(仅分离坐骨神经)、模型组[结扎坐骨神经造成慢性压迫性损伤(CCI)]和电针组(手术后连续6 d取"足三里""环跳"穴给予电针治疗)。手术前1天和手术后第7天测定各组动物的机械性痛阈和热痛阈。采用免疫组化的方法观察大鼠脊髓L4-L5GFAP的变化,并用荧光定量多聚酶链反应技术分别检测TNF-α mRNA和IL-1βmRNA表达变化。结果:CCI可导致大鼠机械性痛阈和热痛阈明显降低,显著激活损伤侧脊髓GFAP,脊髓中TNF-α和IL-1β mRNA的表达明显增多(均P0.05)。给予电针治疗后能明显改善CCI大鼠痛敏状态,并显著降低损伤侧脊髓GFAP活性和TNF-α和IL-1β mRNA的表达(均P0.05)。结论:电针"足三里""环跳"可明显减轻CCI大鼠的疼痛反应,其作用与其降低脊髓GFAP、TNF-α mRNA和IL-1β mRNA的表达有关。     

电针对神经痛大鼠的治疗作用及机制初探

本研究采用行为学及分子生物学方法 ,对电针对神经痛大鼠痛敏分数的影响及其机制进行了系列研究。主要结果如下 :本实验采用结扎一侧大鼠坐骨神经的神经痛模型 ,以双下肢对光热辐射引起的大鼠抬脚潜伏期之间的差值作为痛敏分数 ,从单次电针即刻测痛实验和多次电针次日测痛实验两方面 ,观察电针对神经痛大鼠的痛敏分数的影响。结果显示 :术后第 7天 ,电针单侧“环跳”(ＧＢ 30 )与“阳陵泉”(ＧＢ 34)穴 ,用疏密波 (疏波频率 4Ｈｚ,串长 2 .5ｓｅｃ;密波频率 2 0Ｈｚ,串长 5ｓｅｃ,强度≤ 1ｍＡ ) ,持续 30ｍｉｎ。单次电针可即刻显著减小神…     

电针对坐骨神经慢性缩窄损伤大鼠脊髓α-氨基-3-羧基-5-甲基异恶唑-4-丙酸受体表达的影响

目的:观察电针对坐骨神经慢性缩窄损伤大鼠脊髓相应节段α-氨基-3-羧基-5-甲基异恶唑-4-丙酸(α-amino-3-ydroxy-5-methylisoxazole-4-propionate,AMPA)受体表达的影响,探讨电针干预神经病理性痛的脊髓机制。方法:SD大鼠分为假手术组、模型组和电针组,各20只,采用坐骨神经慢性缩窄损伤法制备神经病理性痛模型。电针组电针大鼠损伤侧"委中"与"环跳"穴,每次30min,每日1次,治疗7d。采用免疫组化法和蛋白印迹法测定脊髓AMPA受体亚基1(GluR 1)的表达,采用反转录-聚合酶链反应(RT-PCR)法测定脊髓GluR 1mRNA的表达。结果:与假手术组比较,模型组脊髓GluR 1免疫组化与蛋白印迹表达量均升高(P0.05,P0.01),GluR 1mRNA的表达升高(P0.05);与模型组比较,电针组脊髓GluR 1免疫组化与蛋白印迹及其mRNA表达均被逆转(P0.05)。结论:电针能够减轻大鼠神经病理性痛的机制可能与有效地下调脊髓AMPA受体GluR 1的表达有关。     

Emblica officinalis corrects functional, biochemical and molecular deficits in experimental diabetic neuropathy by targeting the oxido-nitrosative stress mediated inflammatory cascade

Diabetic neuropathy is one of the most common microvascular complications of diabetes mellitus which affects more than 50% of diabetic patients. Diabetic neuropathic pain is amongst the most difficult types of pain to treat mainly due to the lack of understanding of its etiology and inadequate relief with available drug therapy. The present study targeted oxidative stress mediated nerve damage in diabetic rats using an aqueous extract of Emblica officinalis, a potent natural antioxidant. Diabetic rats exhibited significantly decreased tail‐flick latency in the tail‐immersion test (thermal hyperalgesia) and decreased paw withdrawal threshold in both Randall‐Selitto (mechanical hyperalgesia) and von‐Frey hair test (mechanical allodynia). A decrease in the nociceptive threshold was accompanied by significantly increased oxidative stress, nitrite levels and cytokines (TNF‐α, IL‐1β and TGF‐β1) both in the serum and sciatic nerve of diabetic rats. Treatment with the Emblica officinalis aqueous extract (250, 500 and 1000 mg/kg/day) significantly attenuated all the behavioral, biochemical and molecular alterations in a dose‐dependent manner. The major finding of the study is that insulin alone corrected the hyperglycemia and partially reversed the pain response in diabetic rats. However, combination with Emblica officinalis extract not only attenuated the diabetic condition but also reversed neuropathic pain through modulation of oxidative–nitrosative stress in diabetic rats. Copyright © 2011 John Wiley & Sons, Ltd.     

Morin Suppresses Astrocyte Activation and Regulates Cytokine Release in Bone Cancer Pain Rat Models

As inflammatory and immune responses are involved in pathophysiology of debilitating neuropathic pain, reagents that can modulate these two responses may have therapeutic potential. Morin, derived from the moraceae family of plants, benefits inflammation‐related diseases, but its antinociceptive effects on cancer pain remain elusive. In the present study, we investigated antinociceptive effects of morin on bone cancer pain using a rat model, where rats were subject to implantation of Walker 256 mammary gland carcinoma cells into the tibia. Morin (5–20 mg/kg) dose‐dependently attenuated behavioral hypersensitivities, including mechanical allodynia and free movement pain, which was accompanied by downregulation of astrocyte marker glial fibrillary acidic protein in the spinal cord in cancer‐bearing rats. Treatment with morin also induced reduction of pro‐inflammatory cytokines TNF‐α, IL‐1β, and IL‐6 and upregulation of an antiinflammatory cytokine IL‐10. Furthermore, intrathecal injection of AM630 (an antagonist of cannabinoid receptor 2, CB₂), but not naloxone (an antagonist of opioid receptors), significantly blocked morin attenuation of behavioral hypersensitivities. Taken together, these results suggest that morin suppresses astrocyte activation and neuro‐inflammation induced by bone cancer pain and its antinociceptive effects on bone cancer pain may be associated with activation of CB₂ receptors in the spinal cord. Copyright © 2017 John Wiley & Sons, Ltd.     

电针对神经病理性痛大鼠脊髓神经元型一氧化氮合酶蛋白及其mRNA表达的影响

目的:通过观察坐骨神经慢性压迫性损伤大鼠脊髓神经元型一氧化氮合酶(nNOS)蛋白及其mRNA表达的变化和电针对其的影响,探讨电针干预神经病理性痛的脊髓一氧化氮机制。方法:雄性SD大鼠,随机分为3组(n=12):假手术组仅分离坐骨神经,但不进行结扎;模型组采用坐骨神经慢性压迫性损伤(CCI)法制备神经病理性痛模型;电针组于CCI术后11～17d时应用韩氏穴位神经刺激仪进行损伤侧"委中"穴与"环跳"穴电针干预,刺激频率2Hz,波宽0.6ms,起始电流强度1mA,每10min递增1mA,刺激时间30min,1次/d。于CCI前(基础状态),CCI后10、16d时测定机械痛阈和热痛阈。CCI后17d时各组随机取6只大鼠采用Western blot法测定脊髓nNOS蛋白的表达;另取6只大鼠采用逆转录(RT)-聚合酶链反应(PCR)法测定脊髓nNOS mRNA的表达。结果:CCI后10d,与基础值比较,模型组和电针组机械痛阈和热痛阈降低(P0.01);与CCI后10d比较,电针组CCI后16d时机械痛阈和热痛阈均升高(P0.01)。与假手术组比较,模型组机械痛阈和热痛阈降低(P0.01),脊髓nNOS蛋白及其mRNA表达均上调(P0.05,P0.01);与模型组比较,电针组CCI后16d时机械痛阈和热痛阈升高(P0.01),脊髓nNOS蛋白及其mRNA表达均下调(P0.05)。结论:电针减轻大鼠神经病理性痛的机制可能与有效地抑制脊髓nNOS的活性有关。     

Neuroprotective effect of saponin rich extract of Acorus calamus L. in rat model of chronic constriction injury (CCI) of sciatic nerve-induced neuropathic pain

Ethnopharmacological relevance

Traditionally, Acorus calamus has been used for the treatment and management of headache, migraine, body ache and severe inflammatory pain in the Unani, Ayurveda and Indian system of medicine.

Aim of the study

Present study focuses on the evaluation of saponin rich extract of Acorus calamus (SRE-AC) in chronic constriction injury (CCI) of sciatic nerve induced neuropathic pain and neuronal functional changes in rats.

Materials and methods

The pain sensitive tests, i.e., thermal and mechanical hyperalgesia and sciatic functional index test, were performed on the different days, i.e., days 0, 1, 7, 14, and 21. The motor and sensory nerve conduction velocity was also measured on the 21st day. Tissue total protein, superoxide anion generation, total calcium, myeloperoxidase and TNF-α levels were estimated to assess biochemical changes. Histopathological evaluations were also performed. SRE-AC (20 and 40 mg/kg) and pregabalin (10 mg/kg, serving as a positive control) were administered orally for 14 consecutive days from the day of surgery.

Results

CCI produced significant (P<0.05) increase in thermal and mechanical hyperalgesia, rise in sciatic functional index, decrease in nerve conduction velocity, along with biochemical and histopathological changes. Oral administration of SRE-AC and pregabalin significantly (P<0.05) ameliorated CCI-induced nociceptive pain threshold, sciatic functional and electrophysiological changes in a dose dependent manner. Further, tissue biochemical and histopathological changes were also attenuated.

Conclusion

SRE-AC has shown ameliorative effect in CCI-induced neuropathic pain which may be attributed to its multiple actions including anti-oxidative, anti-inflammatory and neuroprotective actions.     

Intrathecal eugenol administration alleviates neuropathic pain in male Sprague-Dawley rats

The main objective of this study was to determine the central effect of eugenol on neuropathic pain when injected intrathecally at the level of the lumbar spinal cord. In a preliminary study the penetrability of eugenol was evaluated in the CNS of rats. Blood, brain and spinal cord samples were collected at selected time points following eugenol administration and concentrations were determined by tandem liquid chromatography-mass spectrometry. Brain-to-plasma and spinal cord-to-plasma ratios (3.3 and 6.7, respectively) suggest that eugenol penetrates relatively well the CNS of rats, with a preferential distribution in the spinal cord. Following the induction of neuropathic pain in rats using the sciatic nerve ligation model, intrathecal injections of eugenol were done to evaluate the central effect of eugenol. Treatment with 50 μg of eugenol significantly decreased secondary mechanical allodynia after 15 min, 2 h and 4 h (p < 0.05; <0.005; <0.05, respectively) and improved thermal hyperalgesia after 2 h and 4 h (p < 0.001 and p < 0.05). The results support the hypothesis that eugenol may alleviate neuropathic pain, both allodynia and hyperalgesia, by acting centrally most probably at the level of the dorsal horn of the spinal cord where vanilloid receptors can be found.     

芍药甘草汤有效组分对慢性坐骨神经结扎大鼠机械痛敏和热痛敏的影响

目的:观察芍药甘草汤有效组分(SGM)对慢性压迫性损伤(CCI)大鼠机械痛敏和热痛敏的影响,并研究SGM的给药时机和是否有超前镇痛作用。方法:所有大鼠用机械缩足反射阈值(MWT)和热缩足潜伏期(TWL)来分别评价大鼠机械痛敏和热痛敏。SD大鼠随机分为9组,即假手术组、CCI组和空白组,BN组和BS组,于术前7天开始灌胃给予0.9%生理盐水或SGM120mg/kg,每天2次,直至手术当天结束;AN组、AS组为后给药组,于术后第1天给予直至术后第7天;BAN组和BAS组术前7天前开始直至术后第7天。各组分别在术前、术后1、3、7天分别测定MWT和TWL。结果:和空白组和假手术组相比,CCI组术后MWT及TWL明显下降(P0.01)。BS、AS和BAS组与各生理盐水组相比,MWT和TWL在术后1、3和7天均明显增加(P0.01)。BS组和AS组相比,术后第1天的MWT和TWL均明显增加(P0.01),但到术后第7天,AS组的MWT和TWL均高于BS组(P0.01),BAS组和AS组相比,术后第1天的MWT和TWL均明显增加(P0.01),但到术后第7天,两者无明显差异。结论:CCI大鼠从术后1天形成稳定的机械痛敏和热痛敏,SGM能抑制CCI大鼠的机械痛敏和热痛敏作用,术前给予SGM对NP有超前镇痛作用,镇痛作用并能持续数天。和术后用药相比,术前后给药组镇痛作用出现更快。     

电针治疗大鼠神经痛后脑内孤啡肽受体mRNA表达的变化

目的 观察电针治疗大鼠神经痛前后脑内一些与痛觉相关的核团孤啡肽受体mRNA表达的变化。方法 实验分为3组，对照组为正常大鼠，神经痛组为大鼠坐骨神经慢性限制性损伤致神经痛模型，电针组为术后第7日给予神经痛大鼠电针治疗30min。各组动物处死后，取脑组织，冰冻切片，采用原位杂交的方法。观察电针后脑内与痛觉相关的中脑导水管周围灰质腹外侧(vIPAG)、中缝背核(DRN)、中缝大核(NRM)核团孤啡肽受体mRNA表达的变化。结果 大鼠坐骨神经结扎后出现痛敏，电针能明显抑制大鼠痛敏；神经痛大鼠给予电针后脑内vIPAG、DRN、NRM中孤啡肽受体mRNA表达明显降低。结论 实验提示脑内孤啡肽受体可能参与电针镇痛过程。     

透明质酸酶对慢性压迫性神经损伤模型中神经源性疼痛的作用研究

目的:研究透明质酸酶对坐骨神经的疏松结扎(CCI)模型神经源性疼痛的作用,初步探讨临床通过相关穴位点注射透明质酸酶治疗慢性疼痛的机制。方法:采用CCI模型,记录损伤神经异位自发放电和热痛刺激的敏感程度。结果:用透明质酸酶作用于术后7d大鼠的损伤处并进行坐骨神经自发放电的测量,发现在测量的12只模型中,有8只模型的自发放电得到了有效的抑制,这8只的平均抑制率为50.9%±12.4%。在热刺激行为学实验中,损伤局部持续注射透明质酸酶溶液的CCI大鼠在术后3d、6d和14d的热刺激敏感度明显低于局部注射生理盐水的对照组CCI大鼠。通过CCI大鼠损伤坐骨神经组织切片观察,发现神经纤维排列混乱,纤维间存在空泡状间隙,并且在间隙周围分布着染成深色的多糖链;而经过透明质酸酶作用后CCI损伤坐骨神经切片观察,空泡状空隙与深色多糖链沉淀消失,神经排布较处理前更加规则。结论:细胞外基质与神经生理功能密切相关,透明质酸酶能够有效降低CCI模型的异位自发放电;临床穴位注射透明质酸酶改变穴位点聚集的细胞外基质,从而起到镇痛作用。