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1.
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。  相似文献   

2.
Neuropathic pain caused by somatosensory nervous system dysfunction is a serious public health problem. Some long noncoding RNAs (lncRNAs) can participate in physiological processes involved in neuropathic pain. However, the effects of lncRNA DGCR5 in neuropathic pain have not been explored. Therefore, in our current study, we concentrated on the biological roles of DGCR5 in neuropathic pain. Here, it was observed that DGCR5 was significantly decreased in chronic sciatic nerve injury (CCI) rat models. DGCR5 overexpression was able to alleviate neuropathic pain development including mechanical and thermal hyperalgesia. In addition, the current understanding of miR-330-3p function in neuropathic pain remains largely incomplete. Here, we found that miR-330-3p was greatly increased in CCI rats and DGCR5 can modulate miR-330-3p expression negatively. Upregulation of DGCR5 repressed inflammation-correlated biomarkers including interleukin 6 (IL-6), tumor necrosis factor α, and IL-1β in CCI rats by sponging miR-330-3p. The negative correlation between DGCR5 and miR-330-3p was confirmed in our current study. Inhibition of miR-330-3p suppressed neuropathic pain progression by restraining neuroinflammation in vivo. In addition, PDCD4 was predicted as a downstream target of miR-330-3p. Furthermore, PDCD4 was significantly increased in CCI rats and DGCR5 regulated PDCD4 expression through sponging miR-330-3p in CCI rat models. Taken these together, it was implied that DGCR5/miR-330-3p/PDCD4 axis participated in neuropathic pain treatment.  相似文献   

3.
《Cytokine》2015,72(2):207-214
Neuropathic pain is a debilitating condition caused by damage to the somatosensory nervous system, such as peripheral nerve injury. The immune system, and in particular the adaptive T cell response, plays a key role in mediating such pain. Regulatory T (Treg) cells are a small subpopulation of inhibitory T cells that prevent autoimmunity, limit immunopathology and maintain immune homeostasis. Here, we investigated the effects of conditional depletion of Treg cells on mechanical allodynia and serum cytokines in mice with chronic constriction injury (CCI) of the sciatic nerve, an animal model of neuropathic pain. We demonstrate that CCI induced the infiltration of small numbers of Treg cells within effected neuronal tissue. Utilising the transgenic DEREG (DEpletion of REGulatory T cells) mice, we confirmed effective depletion of Foxp3+ Treg cells by diphtheria toxin injections. Following CCI we observed a transient, though significant, increase in pain hypersensitivity for Treg-depleted DEREG mice compared to non-Treg-depleted mice. Analysis of systemic cytokine levels demonstrated significant changes in serum cytokine expression profiles. In particular, we observed significant increases in systemic concentration of RANTES, IL-2 and IL-5, and significant decreases in IL-12 and IFN-γ in nerve-injured Treg-depleted DEREG mice. Further analysis indicated a substantial increase in the serum concentration of IL-12p40 as a direct result of Treg cell depletion. These results suggest that depletion of Foxp3+ Treg cells promote nerve injury-induced pain hypersensitivity, partially by inducing altered systemic concentrations of cytokines, which may act to regulate neuropathic pain.  相似文献   

4.
Neuropathic pain has been reported as a type of chronic pain due to the primary dysfunction of the somatosensory nervous system. It is the most serious types of chronic pain, which can lead to a significant public health burden. But, the understanding of the cellular and molecular pathogenesis of neuropathic pain is barely complete. Long noncoding RNAs (lncRNAs) have recently been regarded as modulators of neuronal functions. Growing studies have indicated lncRNAs can exert crucial roles in the development of neuropathic pain. Therefore, our present study focused on the potential role of the lncRNA Colorectal Neoplasia Differentially Expressed (CRNDE) in neuropathic pain progression. Firstly, a chronic constrictive injury (CCI) rat model was built. CRNDE was obviously increased in CCI rats. Interestingly, overexpression of CRNDE enhanced neuropathic pain behaviors. Neuroinflammation was induced by CRNDE and as demonstrated, interleukin-10 (IL-10), IL-1, IL-6, and tumor necrosis factor-α (TNF-α) protein levels in CCI rats were activated by LV-CRNDE. For another, miR-136 was obviously reduced in CCI rats. Previously, it is indicated that miR-136 participates in the spinal cord injury via an inflammation in a rat model. Here, firstly, we verified miR-136 could serve as CRNDE target. Loss of miR-136 triggered neuropathic pain remarkably via the neuroinflammation activation. Additionally, IL6R was indicated as a target of miR-136 and miR-136 regulated its expression. Subsequently, we confirmed that CRNDE could induce interleukin 6 receptor (IL6R) expression positively. Overall, it was implied that CRNDE promoted neuropathic pain progression via modulating miR-136/IL6R axis in CCI rat models.  相似文献   

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6.
Neuropathic pain, resulting from somatosensory nervous system dysfunction, remains a serious public health problem worldwide. microRNAs are involved in the physiological processes of neuropathic pain. However, the biological roles of miR-98 in neuropathic pain development have not been investigated. Therefore, in our current study, we focused on the effects of miR-98 in neuropathic pain. It was shown that miR-98 was significantly downregulated in chronic sciatic nerve injury (CCI) rat models. In addition, high mobility group A2 (HMGA2) was obviously upregulated in CCI rats. Overexpression of miR-98 inhibited neuropathic pain progression, including mechanical and thermal hyperalgesia. By a bioinformatics analysis, HMGA2 was predicted as a direct target of miR-98. The negative correlation between miR-98 and HMGA2 was validated in our present study. Furthermore, overexpression of miR-98 dramatically repressed HMGA2 protein and messenger RNA (mRNA) expression. Neuroinflammation participates in neural-immune interactions, which can contribute to the neuropathic pain development. Meanwhile, we found that inflammatory cytokine (interleukin [IL]-6, IL-1β, and COX-2) protein expression in rats infected with LV-miR-98 was greatly suppressed. Taking these results together, we concluded that miR-98 might depress neuropathic pain development through modulating HMGA2.  相似文献   

7.
Chronic neuropathic pain, resulting from damage to the central or peripheral nervous system, is a prevalent and debilitating condition, affecting 7-18% of the population1,2. Symptoms include spontaneous (tingling, burning, electric-shock like) pain, dysaesthesia, paraesthesia, allodynia (pain resulting from normally non-painful stimuli) and hyperalgesia (an increased response to painful stimuli). The sensory symptoms are co-morbid with behavioural disabilities, such as insomnia and depression. To study chronic neuropathic pain several animal models mimicking peripheral nerve injury have been developed, one of the most widely used is Bennett and Xie''s (1988) unilateral sciatic nerve chronic constriction injury (CCI)3 (Figure 1). Here we present a method for performing CCI and testing pain hypersensitivity.CCI is performed under anaesthesia, with the sciatic nerve on one side exposed by making a skin incision, and cutting through the connective tissue between the gluteus superficialis and biceps femoris muscles. Four chromic gut ligatures are tied loosely around the sciatic nerve at 1 mm intervals, to just occlude but not arrest epineural blood flow. The wound is closed with sutures in the muscle and staples in the skin. The animal is then allowed to recover from surgery for 24 hrs before pain hypersensitivity testing begins.For behavioural testing, rats are placed into the testing apparatus and are allowed to habituate to the testing procedure. The area tested is the mid-plantar surface of the hindpaw (Figure 2), which falls within the sciatic nerve distribution. Mechanical withdrawal threshold is assessed by mechanically stimulating both injured and uninjured hindpaws using an electronic dynamic plantar von Frey aesthesiometer or manual von Frey hairs4. The mechanical withdrawal threshold is the maximum pressure exerted (in grams) that triggers paw withdrawal. For measurement of thermal withdrawal latency, first described by Hargreaves et al (1988), the hindpaw is exposed to a beam of radiant heat through a transparent glass surface using a plantar analgesia meter5,6. The withdrawal latency to the heat stimulus is recorded as the time for paw withdrawal in both injured and uninjured hindpaws. Following CCI, mechanical withdrawal threshold, as well as thermal withdrawal latency in the injured paw are both significantly reduced, compared to baseline measurements and the uninjured paw (Figure 3). The CCI model of peripheral nerve injury combined with pain hypersensitivity testing provides a model system to investigate the effectiveness of potential therapeutic agents to modify chronic neuropathic pain. In our laboratory, we utilise CCI alongside thermal and mechanical sensitivity of the hindpaws to investigate the role of neuro-immune interactions in the pathogenesis and treatment of neuropathic pain.  相似文献   

8.
Neuropathic pain, caused by a lesion or dysfunction of the somatosensory nervous system, is a severe debilitating condition with which clinical treatment remains challenging. Jun activation domain-binding protein (JAB1) is a multifunctional protein that participates in several signaling pathways, controlling cell proliferation and apoptosis. However, the expression and possible function of JAB1 in the pathogenesis of neuropathic pain has not been elucidated. This study aimed to investigate the possible involvement of JAB1. Here, employing a neuropathic pain model induced by chronic constriction injury (CCI) on rats, we reported the role of JAB1 in the maintenance of neuropathic pain. By western blot, we found that CCI markedly up-regulated JAB1 expression in the dorsal root ganglion (DRG) and spinal cord. Immunofluorescent assay demonstrated that JAB1 was extensively localized in IB4-, CGRP- and NF200-positive neurons in the injured L5 DRG, and mainly co-localized with NeuN in spinal cord. In addition, we showed that CCI induced phosphorylation of p65 and JNK in vivo. Intrathecal injection of JAB1 siRNA significantly attenuated the CCI-induced JNK and p65 phosphorylation and alleviated both mechanical allodynia and heat hyperalgesia in rats. Taken together, these results suggested that JAB1 promotes neuropathic pain via positively regulating JNK and NF-κB activation.  相似文献   

9.
10.
Controlling neuropathic pain is an unmet medical need and we set out to identify new therapeutic candidates. AV411 (ibudilast) is a relatively nonselective phosphodiesterase inhibitor that also suppresses glial-cell activation and can partition into the CNS. Recent data strongly implicate activated glial cells in the spinal cord in the development and maintenance of neuropathic pain. We hypothesized that AV411 might be effective in the treatment of neuropathic pain and, hence, tested whether it attenuates the mechanical allodynia induced in rats by chronic constriction injury (CCI) of the sciatic nerve, spinal nerve ligation (SNL) and the chemotherapeutic paclitaxel (Taxol). Twice-daily systemic administration of AV411 for multiple days resulted in a sustained attenuation of CCI-induced allodynia. Reversal of allodynia was of similar magnitude to that observed with gabapentin and enhanced efficacy was observed in combination. We further show that multi-day AV411 reduces SNL-induced allodynia, and reverses and prevents paclitaxel-induced allodynia. Also, AV411 cotreatment attenuates tolerance to morphine in nerve-injured rats. Safety pharmacology, pharmacokinetic and initial mechanistic analyses were also performed. Overall, the results indicate that AV411 is effective in diverse models of neuropathic pain and support further exploration of its potential as a therapeutic agent for the treatment of neuropathic pain.  相似文献   

11.
Phosphatidylinositol-3-kinase (PI3K) has been identified in the expression of central sensitization after noxious inflammatory stimuli. However, its contribution in neuropathic pain remains to be determined. Here we address the role of PI3K signaling in central sensitization in a model of neuropathic pain, and propose a novel potential drug target for neuropathic pain. Chronic constriction injury (CCI) rat model was used in the study as the model for neuropathic pain. Western blotting, whole-cell patch clamp, and von Frey assay were performed to study biochemical, electrical, and behavioral changes in CCI rats, respectively. A steroid metabolite of the fungi (wortmannin) was used to block PI3K signaling and its effects on CCI rats were tested. PI3K/Akt signaling increased in the spinal cord L4–L6 sections in the CCI rats. CCI also facilitated miniature excitatory postsynaptic potential of dorsal horn substantia gelatinosa neurons, increased phosphorylation of glutamate receptor subunit GluA1 and synapsin at the synapse, and induced mechanic allodynia. Wortmannin reversed biochemical, electrical, and behavioral changes in CCI rats. This study is the first to show PI3K/Akt signaling is required for spinal central sensitization in the CCI neuropathic pain model.  相似文献   

12.
13.
Many studies have verified that microRNAs contribute a lot to neuropathic pain progression. Furthermore, nerve-related inflammatory cytokines play vital roles in neuropathic pain progression. miR-183 has been identified to have a common relationship with multiple pathological diseases. However, the potential effects of miR-183 in the process of neuropathic pain remain undetermined. Therefore, we performed the current study with the purpose of finding the functions of miR-183 in neuropathic pain progression using a chronic sciatic nerve injury (CCI) rat model. We demonstrated that miR-183 expression levels were evidently reduced in CCI rats in contrast with the control group. Overexpression of miR-183 produced significant relief of mechanical hyperalgesia, as well as thermal hyperalgesia in CCI rats. Furthermore, neuropathic pain-correlated inflammatory cytokine expression levels containing interleukin-6 (IL-6) and interleukin-1β (IL-1β), cyclooxygenase-2 (COX-2) were obviously inhibited by upregulation of miR-183. Meanwhile, dual-luciferase reporter assays showed MAP3K4 was a direct downstream gene of miR-183. The expression levels of MAP3K4 were modulated by the increased miR-183 negatively, which lead to the downregulation of IL-6, IL-1β, and COX-2, and then reduced neuropathic pain progression, respectively. Overall, our study pointed out that miR-183 was a part of the negative regulator which could relieve neuropathic pain by targeting MAP3K4. Thus it may provide a new clinical treatment for neuropathic pain patients clinical therapy.  相似文献   

14.
MicroRNA (miRNA) are significant regulators of neuropathic pain development and neuroinflammation can contribute a lot to the progression of neuropathic pain. Recently, miR-98 has been reported to be involved in various diseases. However, little is known about the role of miR-98 in neuropathic pain development and neuroinflammation. Therefore, our study was aimed to investigate the function of miR-98 in neuropathic pain via establishing a rat model using chronic constriction injury (CCI) of the sciatic nerve. Here, we observed that miR-98 was downregulated in CCI rat models. Overexpression of miR-9 was able to inhibit neuropathic pain progression. Recently, STAT3 has been reported to serve a key role in various processes, including inflammation. Interestingly, our study indicated that STAT3 was dramatically upregulated and activated in CCI rats. By using informatics analysis, STAT3 was predicted as a direct target of miR-98 and the direct correlation was confirmed. Then, miR-98 was overexpressed in CCI rats and it was found that miR-98 was able to repress neuropathic pain development via inhibiting the neuroinflammation. As displayed, interleukin 6 (IL-6), IL-1β, and tumor necrosis factor-α (TNF-α) expression was obviously induced in CCI rats, while miR-98 reduced their protein levels. Finally, we found that overexpression of STAT3 reversed the inhibitory effect of miR-98 on neuropathic pain development. Taken these together, we reported that overexpression of miR-98 attenuated neuropathic pain development via targeting STAT3 in CCI rat models.  相似文献   

15.
Long non-coding RNAs (lncRNAs) are involved in the progression of several diseases. The interactions among lncRNAs, microRNA (miRNAs) or their targeting genes are reported to play crucial roles in the development of diseases. LINC00657 is observed to be upregulated in several cancers. However, the biological role of LINC00657 in neuropathic pain progress is unclear. Hence, in our study, we aimed to investigate the function of LINC00657 in neuropathic pain development. A chronic constriction injury (CCI) rat model was established, and we found that LINC00657 was greatly increased in CCI rats associated with a decrease of miR-136. Inhibition of LINC00657 suppressed neuropathic pain via alleviating mechanical and thermal hyperalgesia. In addition, miR-136 overexpression can also inhibit the neuropathic pain development. MiR-136 was predicted to serve as a miRNA target of LINC00657, and dual-luciferase reporter assay confirmed the correlation between LINC00657 and miR-136. Moreover, we observed that the decrease of LINC00657 was able to inhibit the neuroinflammation of CCI rats by targeting expression of cyclooxygenase-2, tumor necrosis factor-α and interleukin-1β while miR-136 inhibitors reversed this phenomenon. Next, by using bioinformatics analysis, ZEB1 was predicted as a direct target of miR-136, and miR-136 could negatively modulate ZEB1 expression. Besides these, ZEB1 was remarkably increased in the CCI rats. Knockdown of ZEB1 can inhibit neuropathic pain development, while miR-136 inhibitors can reverse it. In conclusion, it was implied that LINC00657 can induce the neuropathic pain development via regulating miR-136/ZEB1 axis.  相似文献   

16.
17.
Emerging evidence has suggested that microRNAs play a critical role in neuropathic pain development. However, the biological role of miRNAs in regulating neuropathic pain remains barely known. In our present study, we found that miR-124-3p was significantly downregulated in rats after chronic sciatic nerve injury (CCI). In addition, it was showed that overexpression of miR-124-3p obviously repressed mechanical allodynia and heat hyperalgesia. Meanwhile, it has been reported that neuroinflammation can contribute a lot to neuropathic pain progression. Here, we found that inflammatory cytokine (IL-6, IL-1β, and TNF-⍺) protein expression in rats after CCI greatly increased and miR-124-3p mimics depressed inflammation cytokine levels. Consistently, miR-124-3p alleviated inflammation production in lipopolysaccharide-incubated spinal microglial cells. Bioinformatics analysis revealed that EZH2 acted as a direct target of miR-124-3p, which participated in the miR-124-3p-modulated effects on neuropathic pain development and neuroinflammation. We observed that miR-124-3p was able to promote neuroinflammation and neuropathic pain through targeting EZH2. The direct correlation between them was validated in our current study using dual-luciferase reporter assays. Subsequently, it was manifested that EZH2 abrogated the inhibitory role of miR-124-3p on neuropathic pain progression in CCI rats. Taken these together, our findings highlighted a novel contribution of miR-124-3p to neuropathic pain and indicated the possibilities for developing novel therapeutic options for neuropathic pain.  相似文献   

18.
Liu S  Xu C  Li G  Liu H  Xie J  Tu G  Peng H  Qiu S  Liang S 《Neurochemistry international》2012,60(6):565-572
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.  相似文献   

19.
Glutamate in the peripheral nervous system is involved in neuropathic pain, yet we know little how nerve injury alters responses to this neurotransmitter in primary sensory neurons. We recorded neuronal responses from the ex-vivo preparations of the dorsal root ganglia (DRG) one week following a chronic constriction injury (CCI) of the sciatic nerve in adult rats. We found that small diameter DRG neurons (<30 µm) exhibited increased excitability that was associated with decreased membrane threshold and rheobase, whereas responses in large diameter neurons (>30 µm) were unaffected. Puff application of either glutamate, or the selective ionotropic glutamate receptor agonists alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) and kainic acid (KA), or the group I metabotropic receptor (mGluR) agonist (S)-3,5-dihydroxyphenylglycine (DHPG), induced larger inward currents in CCI DRGs compared to those from uninjured rats. N-methyl-D-aspartate (NMDA)-induced currents were unchanged. In addition to larger inward currents following CCI, a greater number of neurons responded to glutamate, AMPA, NMDA, and DHPG, but not to KA. Western blot analysis of the DRGs revealed that CCI resulted in a 35% increase in GluA1 and a 60% decrease in GluA2, the AMPA receptor subunits, compared to uninjured controls. mGluR1 receptor expression increased by 60% in the membrane fraction, whereas mGluR5 receptor subunit expression remained unchanged after CCI. These results show that following nerve injury, small diameter DRG neurons, many of which are nociceptive, have increased excitability and an increased response to glutamate that is associated with changes in receptor expression at the neuronal membrane. Our findings provide further evidence that glutamatergic transmission in the periphery plays a role in nociception.  相似文献   

20.
Neuropathic pain is a kind of chronic pain because of dysfunctions of somatosensory nerve system. Recently, many studies have demonstrated that microRNAs (miRs) play crucial roles in neuropathic pain development. This study was designed to investigate the effects of miR-134-5p on the process of neuropathic pain progression in a rat model established by chronic sciatic nerve injury (CCI). First, we observed that miR-134-5p was significantly decreased in CCI rat models. Overexpression of miR-134-5p strongly alleviated neuropathic pain behaviors including mechanical and thermal hyperalgesia. Meanwhile, inflammatory cytokine expression, such as IL-6, IL-1β and TNF-α in CCI rats were greatly repressed by upregulation of miR-134-5p. Twist1 has been widely regarded as a poor prognosis biomarker in diverse diseases. Here, by using bioinformatic analysis, 3′-untranslated region (UTR) of Twist1 was predicted to be a downstream target of miR-134-5p in our study. Here, we found that overexpression of miR-134-5p was able to suppress Twist1 dramatically. Furthermore, it was exhibited that Twist1 was increased in CCI rats time-dependently and Twist1 was inhibited in vivo. Subsequently, downregulation of Twist1 in CCI rats could depress neuropathic pain progression via inhibiting neuroinflammation. In conclusion, our current study indicated that miR-134-5p may inhibit neuropathic pain development through targeting Twist1. Our findings suggested that miR-134-5p might provide a novel therapeutic target for neuropathic pain.  相似文献   

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