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Article Open Access

Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway

  • Authors:
    • Caijuan Li
    • Xian Wang
    • Guangfen Zhang
    • Yao Zhang
    • Fan Xia
    • Shiqin Xu
    • Xiaofeng Shen
  • View Affiliations / Copyright

    Affiliations: Department of Anesthesiology, Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, Jiangsu 210004, P.R. China, Department of Anesthesiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210004, P.R. China
    Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1921-1931
    |
    Published online on: June 26, 2020
       https://doi.org/10.3892/mmr.2020.11287
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Abstract

A significant decrease in the expression of spinal microRNA‑29c (miR‑29c), which is responsible for the regulation of oxytocin receptor (OXTR) expression, was observed in nerve injury pain during childbirth. The present study investigates whether spinal miR‑29c could be a potential target for the treatment of pain, via the oxytocin (OT)‑γ‑aminobutyric acid (GABA) pathway. A spared nerve injury (SNI) rat model was established to induce neuropathic pain, simulating hyperalgesia. Spinal neurons were treated with OT to mimic the hormonal changes in the central nervous system after delivery. A change in the neuronal miniature inhibitory postsynaptic currents (mIPSCs) was observed in neurons, following the silencing of miR‑29c or OT treatment with or without OXTR antagonist. The Von‑Frey apparatus was used to measure the animal behaviors. Molecular biological experiments and electrophysical recordings in vivo and in vitro were performed to reveal the potential analgesic mechanisms. miR‑29c was significantly downregulated (more than 8‑fold) in the spinal dorsal horn of delivery+SNI rats compared with the SNI rats. The silencing of miR‑29c resulted in increased pain threshold in SNI rats. Bioinformatics analysis indicated that OXTR was a potential target gene of miR‑29c. The delivery+SNI rats presented with higher levels of OT in the cerebrospinal fluid compared with SNI rats, which indicated that the OT signaling pathway may participate in pain relief response. The increased expression of OXTR and GABA in delivery+SNI rats were observed in the miR‑29c‑silenced SNI rat model, suggesting that the silencing of miR‑29c can mediate pain relief by enhancing the OT‑GABA pathway. In addition, an electrophysiology assay was performed to assess the mIPSCs in neurons. The silencing of miR‑29c in neurons increased the frequency and amplitude of mIPSCs but there was no influence on the decay time, which suggested that the spinal inhibitory neurons became more active, subsequently reducing the feeling of pain. The inhibition of OXTR reversed the enhanced inhibitory postsynaptic currents, indicating a crucial role for OXTR in the miR‑29c‑associated pain regulation. Taken together, the results of the present study suggested that spinal oxytocinergic inhibitory control plays an important role in pain relief in the neuropathic pain rat model undergoing vaginal delivery. Silencing spinal miR‑29c may be a potential target for pain relief through the OT‑GABA pathway.
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Copy and paste a formatted citation
Spandidos Publications style
Li C, Wang X, Zhang G, Zhang Y, Xia F, Xu S and Shen X: Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway. Mol Med Rep 22: 1921-1931, 2020.
APA
Li, C., Wang, X., Zhang, G., Zhang, Y., Xia, F., Xu, S., & Shen, X. (2020). Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway. Molecular Medicine Reports, 22, 1921-1931. https://doi.org/10.3892/mmr.2020.11287
MLA
Li, C., Wang, X., Zhang, G., Zhang, Y., Xia, F., Xu, S., Shen, X."Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway". Molecular Medicine Reports 22.3 (2020): 1921-1931.
Chicago
Li, C., Wang, X., Zhang, G., Zhang, Y., Xia, F., Xu, S., Shen, X."Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway". Molecular Medicine Reports 22, no. 3 (2020): 1921-1931. https://doi.org/10.3892/mmr.2020.11287
Copy and paste a formatted citation
x
Spandidos Publications style
Li C, Wang X, Zhang G, Zhang Y, Xia F, Xu S and Shen X: Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway. Mol Med Rep 22: 1921-1931, 2020.
APA
Li, C., Wang, X., Zhang, G., Zhang, Y., Xia, F., Xu, S., & Shen, X. (2020). Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway. Molecular Medicine Reports, 22, 1921-1931. https://doi.org/10.3892/mmr.2020.11287
MLA
Li, C., Wang, X., Zhang, G., Zhang, Y., Xia, F., Xu, S., Shen, X."Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway". Molecular Medicine Reports 22.3 (2020): 1921-1931.
Chicago
Li, C., Wang, X., Zhang, G., Zhang, Y., Xia, F., Xu, S., Shen, X."Downregulation of microRNA‑29c reduces pain after child delivery by activating the oxytocin‑GABA pathway". Molecular Medicine Reports 22, no. 3 (2020): 1921-1931. https://doi.org/10.3892/mmr.2020.11287
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