Multidimensional Analgesia of Acupuncture by Increasing Expression of MD2 in Central Nervous System

LI Wan-rong; REN Lu-lu; ZHAO Tian-tian; DAI Dan-qing; GAO Xiao-fei; LIANG Hua-zheng; XIONG Li-ze

doi:10.1007/s11655-024-4106-9

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Multidimensional Analgesia of Acupuncture by Increasing Expression of MD2 in Central Nervous System

Acupuncture Research | Updated：2024-10-29

- Multidimensional Analgesia of Acupuncture by Increasing Expression of MD2 in Central Nervous System
- Chinese Journal of Integrative Medicine Vol. 30, Issue 11, Pages: 1035-1044(2024)
- Affiliations：
  
  1.Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai (200434), China
  2.Clinical Research Center for Anesthesiology and Perioperative Medicine, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai (200434), China
  3.Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai (200434), China
  4.Department of Anesthesiology and Perioperative Medicine, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai (200434), China
  5.School of Rehabilitation, Southwest Jiaotong University, Chengdu (618099), China
  6.Monash Suzhou Research Institute, Suzhou, Jiangsu Province (215125), China
- Author bio：
  
  Prof. XIONG Li-ze, E-mail: lizexiong@tongji.edu.cn
- Funds：
- DOI：10.1007/s11655-024-4106-9
  CLC：
- Published：2024-11，
  
  Published Online：29 July 2024，
  
  Accepted：15 November 2023
- Accepted：
Scan QR Code
LI Wan-rong, REN Lu-lu, ZHAO Tian-tian, et al. Multidimensional Analgesia of Acupuncture by Increasing Expression of MD2 in Central Nervous System. [J]. Chinese Journal of Integrative Medicine, 2024,30(11):1035-1044.
DOI：

LI Wan-rong, REN Lu-lu, ZHAO Tian-tian, et al. Multidimensional Analgesia of Acupuncture by Increasing Expression of MD2 in Central Nervous System. [J]. Chinese Journal of Integrative Medicine, 2024,30(11):1035-1044. DOI： 10.1007/s11655-024-4106-9.

摘要

Abstract

Objective:

To investigate changes of myeloid differentiation factor 2 (MD2) in inflammation-induced pain and acupuncture-mediated analgesia.

Methods:

Mice were randomly divided into three groups by a random number table method: saline group (

=16)

complete Freund's adjuvant (CFA) group (

=24) and CFA+electroacupuncture (EA) group (

=26). Inflammation-induced pain was modelled by injecting CFA to the plantar surface of the hind paw of mice and EA was applied to bilateral Zusanli (ST 36) to alleviate pain. Only mice in the CFA+EA group received EA treatment (30 min/d for 2 weeks) 24 h after modelling. Mice in the saline and CFA groups received sham EA. von-Frey test and Hargreaves test were used to assess the pain threshold. Brain and spinal tissues were collected for immunofluorescence staining or Western blotting to quantify changes of MD2 expression.

Results:

CFA successfully induced plantar pain and EA significantly alleviated pain 3 days after modelling (

0.01). Compared with the CFA group

the numb

er of MD2

/c-fos

neurons was significantly increased in the dorsal horn of the spinal cord 7 and 14 days after EA

especially in laminae Ⅰ–Ⅱ

(

0.01). The proportion of double positive cells to the number of c-fos positive cells and the mean fluorescence intensity of MD2 neurons were also significantly increased in laminae Ⅰ–Ⅱ

(

0.01). Western blotting showed that the level of MD2 was significantly decreased by EA only in the hippocampus on day 7 and 14 (both

0.01) and no significant changes were observed in the cortex

thalamus

cerebellum

or the brainstem (

0.05). Fluorescence staining showed significant decrease in the level of MD2 in periagueductal gray (PAG) and locus coeruleus (LC) after CFA injection on day 7 (

0.01 for PAG

0.05 for LC) and EA significantly reversed this decrease (

0.01 for PAG

0.05 for LC).

Conclusion:

The unique changes of MD2 suggest that EA may exert the analgesic effect through modulating neuronal activities of the superficial laminae of the spinal cord and certain regions of the brain.

关键词

Keywords

electroacupuncturemyeloid differentiation factor 2inflammation-induced paindorsal hornperiaqueductal graylocus coeruleus

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