Eriocalyxin B inhibits inflammation induced by CCI-induced microglia activation to relieve neuropathic pain through inhibition of JAK2/STAT3 and NF-κB pathways

Main Article Content

Zhifeng Sheng
Xiaoyan Pan

Keywords

EriB, inflammation, microglia activation, neuropathic pain, JAK2/STAT3 and NF-κB pathways

Abstract

Neuropathic pain is a very troublesome disease that seriously affects human life. Eriocalyxin B (EriB) has been revealed to attenuate various diseases through its anti-inflammatory effects, but its regulatory effects on neuropathic pain remains unclear. The paw withdrawal threshold and paw withdrawal thermal latency were detected through mechanical allodynia and thermal hyperalgesia tests. The spinal injury was assessed through hematoxylin and eosin staining. The cell apoptosis was measured through terminal deoxynucleotide transferase-mediated dUTP nick end-labeling assay. The protein expressions were examined through Western blot analysis. The mRNA expression was examined through reverse transcription-quantitative polymerase chain reaction. The ionized calcium-binding adaptor molecule 1 level in the spinal cord was evaluated through immunofluorescence assay. The levels of tumor necrosis factor-α, interleukin (IL)-1β, and IL-6 were measured through enzyme-linked-immunosorbent serologic assay. The chronic constriction injury (CCI) rat model was constructed for the study. Our results demonstrated that EriB relieved CCI-stimulated neuropathic pain and nerve damage. In addition, the enhanced neural apoptosis mediated by CCI induction was reduced after EriB treatment. In addition, EriB inhibited CCI-induced microglia activity and inflammation. At last, the Janus kinase 2–signal transducer and activator of transcription 3 (JAK2/STAT3) and nuclear factor kappa B (NF-κB) pathways were activated in CCI rat model, which were attenuated following EriB treatment. Importantly, EriB (10 mg/kg) had a strong effect that was similar to the positive control (1-μg/kg dexmedetomidine), suggesting that EriB may be an effective drug for neuropathic pain. This study demonstrated that EriB inhibited inflammation caused by CCI-induced microglia activation to relieve neuropathic pain through inhibition of JAK2/STAT3 and NF-κB pathways. This study may highlight the regulatory functions of EriB in the treatment of neuropathic pain.

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