Regulation of PINK1/Parkin-mediated hippocampal neuronal mitophagy with Shugan Tiaoshen acupuncture for alleviating chronic inflammatory pain and depression comorbidity
Study on Mechanism|更新时间:2026-01-16
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Regulation of PINK1/Parkin-mediated hippocampal neuronal mitophagy with Shugan Tiaoshen acupuncture for alleviating chronic inflammatory pain and depression comorbidity
Chinese Acupuncture & MoxibustionVol. 46, Issue 1, Pages: 85-96(2026)
LIU Guanghua, FU Wen, WU Yisen, et al. Regulation of PINK1/Parkin-mediated hippocampal neuronal mitophagy with Shugan Tiaoshen acupuncture for alleviating chronic inflammatory pain and depression comorbidity[J]. Chinese Acupuncture & Moxibustion, 2026, 46(1): 85-96. DOI: 10.13703/j.0255-2930.20241115-k0006.
DOI:
LIU Guanghua, FU Wen, WU Yisen, et al. Regulation of PINK1/Parkin-mediated hippocampal neuronal mitophagy with Shugan Tiaoshen acupuncture for alleviating chronic inflammatory pain and depression comorbidity[J]. Chinese Acupuncture & Moxibustion, 2026, 46(1): 85-96. DOI: 10.13703/j.0255-2930.20241115-k0006.DOI:
Regulation of PINK1/Parkin-mediated hippocampal neuronal mitophagy with Shugan Tiaoshen acupuncture for alleviating chronic inflammatory pain and depression comorbidity
and regulating the mind) on hippocampal neural mitophagy and oxidative stress-related factors in the rats with chronic inflammatory pain and depression comorbidity (CIPDC)
and its protective effect on hippocampal neurons; and explore the underlying mechanism of this acupuncture therapy for alleviating CIPDC.
Methods
2
Of 60 Sprague-Dawley (SD) rats
12 rats were randomly selected as the control group. CIPDC models were established by subcutaneous injection with complete Freund's adjuvant (CFA) into the plantar region of the left hind paws of the rest rats. Forty-eight successfully modeled rats were assigned into a model group
an electroacupuncture (EA) group
an inhibitor group and an EA + inhibitor group
12 rats in each one. In the EA group
EA was applied to "Yintang" (GV24
+
)
"Baihui" (CV20)
and bilateral "Hegu" (LI4) and "Taichong" (LR3). Electric stimulation was delivered at "Hegu" (LI4) and "Taichong" (LR3) unilaterally
with disperse-dense wave
a frequency of 2 Hz/10 Hz
and a current of 1 mA. EA w
as operated for 30 min daily. In the inhibitor group
autophagy inhibitor
3-methl adenine (3-MA) was injected intraperitoneally. In the EA + inhibitor group
EA was delivered after intraperitoneal injection with 3-MA. The intervention of each group was operated once daily and for 14 consecutive days. Pain threshold was assessed using paw withdrawal mechanical threshold (PWMT) and paw withdrawal thermal latency (PTWL). Depressive-like behaviors were evaluated using the sucrose preference test
open-field test
and forced swimming test. Hematoxylin and eosin (HE) staining was used to observe the pathological morphology of hippocampal neurons. Fluoro-Jade B staining was performed to assess hippocampal neuronal injury and degeneration. Transmission electron microscopy (TEM) was employed to examine the ultrastructure of hippocampal mitochondria. Hippocampal reactive oxygen species (ROS) expression was detected using flow cytometry. The content of malondialdehyde (MDA) and superoxide dismutase (SOD) in the hippocampus were measured using a colorimetric method. Western blot analysis was conducted to detect the protein expression of sequenstering protein 1 (p62)
PTEN induced putative kinase 1 (PINK1)
Parkin protein (Parkin)
Beclin1
and microtubule-associated protein 1A/1B 1ight chain3 (LC3) in the hippocampus. Real-time PCR was used to detect the mRNA expression of p62
PINK1
Parkin and Beclin1.
Results
2
Compared with the control group
in the model group
PWMT
PTWL
sucrose preference rate
total distance traveled in the open field
and time spent in the center area decreased (
P
<
0.05)
while the immobility time increased (
P
<
0.05); the mitochondria was ruptured and swollen and the internal crista were broken or disappeared; the content of ROS and MDA elevated (
P
<
0.05) and SOD reduced (
P
<
0.05); the protein and mRNA expression of hippocampal p62
PINK1
Parkin and Beclin 1
as well as the protein expression
of LC3 were not different statistically (
P
>
0.05). Compared with the model group
in the EA group
PWMT
PTWL
sucrose preference rate
total distance traveled in the open field
and time spent in the center area increased (
P
<
0.05)
while the immobility time decreased (
P
<
0.05); hippocampal neurons were rounded and neatly arranged
with the number of degenerated neurons declined (
P
<
0.05); the mitochondrial morphology was relatively normal
and the bilayer membrane structure intact
and autophagosomes visible; the content of ROS and MDA reduced (
P
<
0.05) and SOD elevated (
P
<
0.05); the protein and mRNA expression of hippocampal p62 was declined (
P
<
0.05)
and the protein and mRNA expression of PINK1
Parkin and Beclin 1 was elevated (
P
<
0.05)
and the protein expression of LC3 rose (
P
<
0.05). When compared with the EA group
in the EA + inhibitor group
PWMT
PTWL
sucrose preference rate
total distance traveled in the open field
and time spent in the center area were reduced (
P
<
0.05)
while the immobility time was higher (
P
<
0.05); hippocampal neurons were more disarranged
with increased nuclear membrane damage and more degenerated neurons (
P
<
0.05); the damage in mitochondrial bilayers and cristae was obvious; the content of ROS and MDA higher (
P
<
0.05) and SOD lower (
P
<
0.05); the protein and mRNA expression of hippocampal p62 was elevated (
P
<
0.05)
and protein and mRNA expression of PINK1
Parkin and Beclin 1 was reduced (
P
<
0.05)
and the protein expression of LC3 decreased (
P
<
0.05).
Conclusion
2
Shugan Tiaoshen
acupuncture presents a protective effect on CIPDC by enhancing hippocampal neuronal mitophagy through regulating the PINK1/Par
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