Chinese Journal of Tissue Engineering Research ›› 2023, Vol. 27 ›› Issue (2): 230-236.doi: 10.12307/2022.934
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Zhao Feng1, Fan Shaoqing1, Cheng Xiaoyan1, Li Xiaona1, Li Changsheng2, Ma Haojie1
Received:
2021-07-13
Accepted:
2021-10-28
Online:
2023-01-18
Published:
2022-06-20
Contact:
Zhao Feng, Department of Anesthesiology, Henan Province Hospital of Traditional Chinese Medicine, Zhengzhou 450002, Henan Province, China
About author:
Zhao Feng, Master, Associate chief physician, Department of Anesthesiology, Henan Province Hospital of Traditional Chinese Medicine, Zhengzhou 450002, Henan Province, China
Supported by:
CLC Number:
Zhao Feng, Fan Shaoqing, Cheng Xiaoyan, Li Xiaona, Li Changsheng, Ma Haojie. miR-132-3p targets and modulates Ptch1 to reduce neuropathic pain in mice with chronic constriction injury[J]. Chinese Journal of Tissue Engineering Research, 2023, 27(2): 230-236.
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2.3 预测及验证miR-132-3p通过与Ptch1的3'-UTR结合靶向调节Ptch1的表达 通过在线数据库starBase预测得到miR-132-3p与Ptch1的3'-UTR相结合,结合位点见图3A。随后通过双荧光素酶报告基因实验进一步验证其靶向调节作用,结果发现miR-132-3p-mimic降低野生型(WT)Ptch1 3'-UTR报告载体的荧光素酶活性,而对突变型(MUT)没有影响,见图3B。转染miR-132-3p-mimic或inhibitor进入BV2细胞24 h后用脂多糖刺激培养24 h,通过Western blot检测Ptch1的表达,结果显示过表达miR-132-3p后抑制了BV2细胞中Ptch1的表达(P < 0.05),见图3C,D。"
2.4 Ptch1对小胶质细胞的激活以及P2X4R表达的影响 将Ptch1表达载体pcDNA-Ptch1或siRNA(si-Ptch1)转染BV2细胞24 h后用脂多糖刺激培养24 h,通过Western blot检测过表达和干扰效率,见图4A,B。然后检测小胶质细胞激活标记物IBA1以及P2X4R的表达,结果显示敲低Ptch1抑制了小胶质细胞的激活以及P2X4R的表达(P < 0.05),见图4C,D。研究发现Shh信号通路在慢性压迫性神经损伤疼痛模型中被激活,慢性压迫性神经损伤大鼠脊髓腰骶膨大部位Shh信号通路蛋白Shh、Gli表达增加,而Ptch1受Shh信号通路调节且能对Shh信号通路起调控作用[19]。因此,该研究通过Western blot进一步检测Shh信号通路标记蛋白的表达来观察该通路是否在小胶质细胞激活过程中发挥作用,结果显示激活的小胶质细胞中Shh通路标记蛋白表达上调,而敲低Ptch1则抑制该通路的激活(P < 0.05),见图4E-H。"
2.5 过表达Ptch1逆转miR-132-3p-mimic在小胶质细胞中的作用 单独转染miR-132-3p-mimic或者与pcDNA-Ptch1共同转染BV2细胞24 h后用脂多糖刺激培养24 h,通过Western blot检测Ptch1的表达,结果发现pcDNA-Ptch1逆转miR-132-3p-mimic对其表达的影响,见图5A,B。然后通过Western blot检测Shh信号通路标记蛋白、IBA1以及P2X4R的表达,结果表明过表达Ptch1逆转了miR-132-3p-mimic对Shh信号通路以及对小胶质细胞激活的抑制作用,上调P2X4R的表达(P < 0.05),见图5C-F。"
为观察miR-132-3p对慢性压迫性神经损伤小鼠神经性疼痛的影响,于术后第7天鞘内注射miR-132-3p-mimic,在不同时间点监测动物行为指标,结果发现鞘内注射miR-132-3p-mimic明显提高慢性压迫性神经损伤小鼠的机械缩足反射阈值和热阈值,减轻小鼠的机械和热痛觉过敏,见图6A,B。随后各组选取3只小鼠麻醉处死,分离术侧背根神经节,采用RT-qPCR、Western blot检测miR-132-3p、Ptch1、Shh信号通路标记蛋白以及P2X4R的表达,结果显示慢性压迫性神经损伤小鼠背根神经节中miR-132-3p表达下调(P < 0.05),见图6C,Ptch1表达上调(P < 0.05),见图6D,E,Shh信号通路处于激活状态(P < 0.05),见图6D,F,P2X4R表达上调(P < 0.05),见图6D,E,鞘内注射miR-132-3p-mimic可以下调Ptch1的表达,抑制Shh信号通路的激活发挥镇痛作用,减轻慢性压迫性神经损伤小鼠的神经性疼痛,见图6C-F。 "
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