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Diabetic neuropathic pain (DNP) and depression (DP) are the common complications in patients with diabetes. The purpose of our research was to observe whether brain-derived neurotrophic factor (BDNF) levels and tropomyosin receptor kinase B (TrkB) in the nervous system have effects on rats with comorbid DNP and DP, and to determine whether dihydromyricetin (DHM) may influence BDNF/ TrkB pathway to mitigatethe comorbidity. The study showed that DHM treatment could attenuates pain and depressive behavior in DNP and DP combined rats. Compared with the control group, the expression level of BDNF/TrkB in the hippocampus of DNP + DP group were reduced, while the expression levels in the spinal cord and DRG were increased. However, after treatment with DHM, those changes were reversed. Compared with the control group, the level of IL-1β and TNF-α in the hippocampus, spinal cord and DRG in the DNP + DP group was significantly increased, and DHM treatment could reduce the increase. Thus our study indicated that DHM can relief symptoms of DNP and DP by suppressing the BDNF/TrkB pathway and the proinflammatory factor, and BDNF/TrkB pathway may be an effective target for treatment of comorbid DNP and DP.

Dihydromyricetin affects BDNF levels in the nervous system in rats with comorbid diabetic neuropathic pain and depression