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Expression and functional characterization of transient receptor potential vanilloid 4 in the dorsal root ganglion and spinal cord of diabetic rats with mechanical allodynia.
Brain Research Bulletin ( IF 3.5 ) Pub Date : 2020-05-30 , DOI: 10.1016/j.brainresbull.2020.05.010
Yuan-Yuan Cui 1 , Meng-Ying Li 2 , Yu-Ting Li 3 , Jia-Yi Ning 3 , Xing-Chun Gou 4 , Juan Shi 5 , Yun-Qing Li 6
Affiliation  

Diabetic mechanical allodynia (DMA) is a common manifestation in patients with diabetes mellitus, and currently, no effective treatment is available. Transient receptor potential vanilloid 4 (TRPV4) is involved in mechanical hypersensitivity resulting from varying aetiologies in animal, but its expression pattern during DMA and whether it contributes to this condition are still unclear. We investigated the spatial and temporal expression patterns of TRPV4 in the dorsal root ganglion (DRG) and spinal dorsal horn (SDH) by qRT-PCR, Western blotting and immunofluorescence assays. The pathophysiological role of TRPV4 in DMA was also investigated by intrathecal application of the TRPV4 selective antagonist HC-067047 or the agonist GSK1016790A. The results showed that both the mRNA and protein levels of TRPV4 were strikingly upregulated on day 14 in the rats with DMA. The increase in TRPV4 was mainly observed in the soma and central processes of calcitonin gene-related peptide (CGRP)- or neurofilament 200 kDa (NF200)-containing DRG neurons. Both single and repetitive intrathecal applications of HC-067047 (400 ng/kg) significantly alleviated mechanical allodynia in the rats with DMA, whereas a single application of GSK1016790A (200 ng/kg) aggravated mechanical allodynia. The present data suggest that TRPV4 undergoes expression changes that are associated with mechanical hypersensitivity in diabetic rats. TRPV4 may be a new molecular target for developing a clinical strategy to treat this intractable neuropathic pain.



中文翻译:

机械性异常性疼痛糖尿病大鼠背根神经节和脊髓中瞬时受体电位香草素4的表达及功能表征。

糖尿病机械性异常性疼痛(DMA)是糖尿病患者的常见表现,目前尚无有效的治疗方法。瞬时受体电位香草素 4 (TRPV4) 参与由动物不同病因引起的机械超敏反应,但其在 DMA 期间的表达模式以及它是否导致这种情况仍不清楚。我们通过 qRT-PCR、蛋白质印迹和免疫荧光测定研究了 TRPV4 在背根神经节 (DRG) 和脊髓背角 (SDH) 中的时空表达模式。还通过鞘内应用 TRPV4 选择性拮抗剂 HC-067047 或激动剂 GSK1016790A 研究了 TRPV4 在 DMA 中的病理生理作用。结果表明,在 DMA 大鼠中,TRPV4 的 mRNA 和蛋白质水平在第 14 天显着上调。TRPV4 的增加主要在降钙素基因相关肽 (CGRP) 或神经丝 200 kDa (NF200) 的 DRG 神经元的胞体和中枢过程中观察到。HC-067047 (400 ng/kg) 的单次和重复鞘内应用均可显着减轻 DMA 大鼠的机械性异常性疼痛,而单次应用 GSK1016790A (200 ng/kg) 会加重机械性异常性疼痛。目前的数据表明,TRPV4 的表达变化与糖尿病大鼠的机械过敏有关。TRPV4 可能是开发治疗这种顽固性神经性疼痛的临床策略的新分子靶标。TRPV4 的增加主要在降钙素基因相关肽 (CGRP) 或神经丝 200 kDa (NF200) 的 DRG 神经元的胞体和中枢过程中观察到。HC-067047 (400 ng/kg) 的单次和重复鞘内应用均可显着减轻 DMA 大鼠的机械性异常性疼痛,而单次应用 GSK1016790A (200 ng/kg) 会加重机械性异常性疼痛。目前的数据表明,TRPV4 的表达变化与糖尿病大鼠的机械过敏有关。TRPV4 可能是开发治疗这种顽固性神经性疼痛的临床策略的新分子靶标。TRPV4 的增加主要在降钙素基因相关肽 (CGRP) 或神经丝 200 kDa (NF200) 的 DRG 神经元的胞体和中枢过程中观察到。HC-067047 (400 ng/kg) 的单次和重复鞘内应用均可显着减轻 DMA 大鼠的机械性异常性疼痛,而单次应用 GSK1016790A (200 ng/kg) 会加重机械性异常性疼痛。目前的数据表明,TRPV4 的表达变化与糖尿病大鼠的机械过敏有关。TRPV4 可能是开发治疗这种顽固性神经性疼痛的临床策略的新分子靶标。HC-067047 (400 ng/kg) 的单次和重复鞘内应用均可显着减轻 DMA 大鼠的机械性异常性疼痛,而单次应用 GSK1016790A (200 ng/kg) 会加重机械性异常性疼痛。目前的数据表明,TRPV4 的表达变化与糖尿病大鼠的机械过敏有关。TRPV4 可能是开发治疗这种顽固性神经性疼痛的临床策略的新分子靶标。HC-067047 (400 ng/kg) 的单次和重复鞘内应用均可显着减轻 DMA 大鼠的机械性异常性疼痛,而单次应用 GSK1016790A (200 ng/kg) 会加重机械性异常性疼痛。目前的数据表明,TRPV4 的表达变化与糖尿病大鼠的机械过敏有关。TRPV4 可能是开发治疗这种顽固性神经性疼痛的临床策略的新分子靶标。

更新日期:2020-05-30
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