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Ketamine relieves depression-like behaviors induced by chronic postsurgical pain in rats through anti-inflammatory, anti-oxidant effects and regulating BDNF expression

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Abstract

Rationale

Clinically, chronic postsurgical pain (CPSP) is very common. Many CPSP patients may experience depression. Thus far, little is known about the mechanism of the comorbidity of CPSP and depression. Ketamine has been confirmed to possess analgesic and rapid antidepressant effects, but it is unclear whether ketamine can relieve the comorbidity of CPSP and depression.

Objectives

The present study evaluated the effects of ketamine in rats with the comorbidity of CPSP and depression.

Methods

We induced CPSP in rats by thoracotomy and screened for rats with or without depression-like phenotype by hierarchical cluster analysis based on the results of depression-related behavioral experiments. Subsequently, rats were intraperitoneally injected with ketamine (20 mg/kg) and were evaluated by mechanical withdrawal threshold, cold hyperalgesia test, sucrose preference test, forced swimming test, and open field test. The inflammatory-related cytokines (IL-1, IL-6, TNF-α, nuclear factor-kappaB), oxidative stress parameters (superoxide dismutase, malondialdehyde, glutathione, catalase), and brain-derived neurotrophic factor (BDNF) in rat hippocampus were detected.

Results

In the hippocampus of rats with the comorbidity of CPSP and depression, IL-1, IL-6, TNF-α, nuclear factor-kappaB, and malondialdehyde were significantly increased, while superoxide dismutase, glutathione, catalase, and BDNF were significantly decreased. Ketamine relieved depression but did not attenuate hyperalgesia in CPSP rats. Additionally, ketamine reduced proinflammatory cytokines, inhibited oxidative stress, and elevated BDNF levels in rat hippocampus.

Conclusions

Ketamine can rapidly relieve CPSP-induced depression in rats, which may be related to the reduction of proinflammatory cytokines, regulating oxidative stress and increasing BDNF in the hippocampus.

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Abbreviations

MWT:

mechanical withdrawal threshold

CPSP:

chronic postsurgical pain

POD:

postoperative day

SPT:

sucrose preference test

FST:

forced swim test

OFT:

open field test

IL:

interleukin

TNF:

tumor necrosis factor

NF-κB:

nuclear factor-kappaB

SOD:

superoxide dismutase

MDA:

malondialdehyde

GSH:

glutathione

CAT:

catalase

BDNF:

brain-derived neurotrophic factor

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Funding

This study was supported by Eleventh Five-Year Plan Military Medical Research Fund of China (grant numbers 06Z051).

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Correspondence to Yitian Yang or Hong Zhang.

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The authors declare that they have no conflict of interest.

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Yang, Y., Song, Y., Zhang, X. et al. Ketamine relieves depression-like behaviors induced by chronic postsurgical pain in rats through anti-inflammatory, anti-oxidant effects and regulating BDNF expression. Psychopharmacology 237, 1657–1669 (2020). https://doi.org/10.1007/s00213-020-05490-3

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  • DOI: https://doi.org/10.1007/s00213-020-05490-3

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