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Neuregulin1-ErbB4 Signaling in Spinal Cord Participates in El
AAV-fPV was used to knockout ErbB4 in PV-expressing interneurons specifically. (From BrainVTA)
The viruses used in this article from BrainVTA are in the table below
Custom-Made AAVs  rAAV-fPV-CRE-pAs
Chaofan Wan,Yunlong Xu,Baoyan Cen,Yucen Xia,Lin Yao,Yuanjia Zheng,Jiaying Zhao,Su He,Yongjun Chen
Pub Date: 2021-01-28, DOI: 10.3389/fnins.2021.636348, Email: [email protected]
Chronic inflammatory pain is a severe clinical symptom that aggravates the life quality of patients and places a huge economic burden on individuals and society. As one complementary and alternative therapy, electroacupuncture (EA) is widely used in clinical practice to treat chronic inflammatory pain based on its safety and efficacy. Previous studies have revealed the potential role of adenosine, neuropeptides, and inflammatory factors in EA analgesia in various pain models, but the identity of some of the signaling pathways involved remain unknown. In the present study, we explored whether neuregulin1 (NRG1)-ErbB4 signaling is involved in EA analgesia in inflammatory pain. Repeated EA treatment at the acupoints Zusanli (ST36) and Sanyinjiao (SP6) for 3 consecutive days remarkably attenuated mechanical allodynia and thermal hyperalgesia in complete Freund's adjuvant (CFA)-treated mice, with an increased expression of NRG1 in spinal cord (SC). We found that ErbB4 kinase participated in both the EA and NRG1 mediated analgesic effects on inflammatory pain by pharmacological inhibition or genetic ablation ErbB4 in vivo. Intriguingly, the mice with conditional knockout of ErbB4 from PV+ interneurons in SC showed abnormal basal mechanical threshold. Meanwhile, NRG1 treatment could not relieve tactile allodynia in PV-Erbb4-/- mice or AAV-PV-Erbb4-/- mice after CFA injection. These experimental results suggest that regulating NRG1-ErbB4 signaling in SC could reduce pain hypersensitivity and contribute to EA analgesia in inflammatory pain.

Figure 1. Ablation of ErbB4 from PV neurons blocks the effect of NRG1 on CFA-induced mechanical hyperalgesia.
In this study, the authors are aimed to explore whether neuregulin1 (NRG1)-ErbB4 signaling is involved in electroacupuncture (EA) analgesia in inflammatory pain. The results indicate potential roles for Neuregulin1-ErbB4 signaling in SC in allodynia and EA analgesia in inflammatory pain.
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