Journal
JOURNAL OF NEUROINFLAMMATION
Volume 19, Issue 1, Pages -Publisher
BMC
DOI: 10.1186/s12974-022-02503-0
Keywords
Comorbid; Depression; Neuropathic pain; Spared nerve injury; Prelimbic cortex; IL-6
Categories
Funding
- National Natural Science Foundation of China [31970936, 81901127, 81801103]
- Science and Technology Program of Guangdong [2018B030334001]
- Natural Science Foundation of Guangdong [2019A1515010645, 2019A1515010871, 2022A1515010414]
- Excellent Young Researcher Program of the 5th Affiliated Hospital of SYSU [WYYXQN-2021004]
- Guangzhou Science and Technology Plan Project [202206060004]
- Department of Science and Technology of Guangdong Province [2018B030322006]
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This study found that the adaptation of PrL mediated by IL-6/STAT3/Acp5 pathway is associated with the comorbidity of neuropathic pain and depression induced by SNI.
Background The adaption of brain region is fundamental to the development and maintenance of nervous system disorders. The prelimbic cortex (PrL) participates in the affective components of the pain sensation. However, whether and how the adaptation of PrL contributes to the comorbidity of neuropathic pain and depression are unknown. Methods Using resting-state functional magnetic resonance imaging (rs-fMRI), genetic knockdown or overexpression, we systematically investigated the activity of PrL region in the pathogenesis of neuropathic pain/depression comorbid using the combined approaches of immunohistochemistry, electrophysiology, and behavior. Results The activity of PrL and the excitability of pyramidal neurons were decreased, and the osteoclastic tartrate-resistant acid phosphatase 5 (Acp5) expression in PrL neurons was upregulated following the acquisition of spared nerve injury (SNI)-induced comorbidity. Genetic knockdown of Acp5 in pyramidal neurons, but not parvalbumin (PV) neurons or somatostatin (SST) neurons, attenuated the decrease of spike number, depression-like behavior and mechanical allodynia in comorbidity rats. Overexpression of Acp5 in PrL pyramidal neurons decreased the spike number and induced the comorbid-like behavior in naive rats. Moreover, the expression of interleukin-6 (IL-6), phosphorylated STAT3 (p-STAT3) and acetylated histone H3 (Ac-H3) were significantly increased following the acquisition of comorbidity in rats. Increased binding of STAT3 to the Acp5 gene promoter and the interaction between STAT3 and p300 enhanced acetylation of histone H3 and facilitated the transcription of Acp5 in PrL in the modeled rodents. Inhibition of IL-6/STAT3 pathway prevented the Acp5 upregulation and attenuated the comorbid-like behaviors in rats. Conclusions These data suggest that the adaptation of PrL mediated by IL-6/STAT3/Acp5 pathway contributed to the comorbidity of neuropathic pain/depression induced by SNI.
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