BDNF/Trk/KCC2 pathway in nicotine withdrawal-induced hyperalgesia

Shi, Wenhui; Ding, Yong; Yu, Ailan; Wang, Qing-He; Zhang, Zongwang; Zhang, Licai

doi:10.1515/tnsci-2015-0022

Cited by 1 publication

(2 citation statements)

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“…Shi Wenhui et al. (Shi W et al., 2015) found that the BDNF–TrkB–KCC2 pathway is involved in nicotine‐withdrawal‐induced anaphylactic pain. In animal models of inflammatory pain, neuropathic pain, and opioid‐induced hyperalgesia (Liu et al., 2017; Yajima et al., 2005) BDNF has been shown to downregulate KCC2 expression by activating the TrkB receptor.…”

Section: Introductionmentioning

confidence: 99%

“…Potassium chloride co-transporter 2 (KCC2) is a major Cl − extruder in the central nervous system and plays a major role in Cl − homeostasis (Coull et al, 2005). Shi Wenhui et al (Shi W et al, 2015) found that the BDNF-TrkB-KCC2 pathway is involved in nicotine-withdrawalinduced anaphylactic pain. In animal models of inflammatory pain, neuropathic pain, and opioid-induced hyperalgesia (Liu et al, 2017;Yajima et al, 2005) BDNF has been shown to downregulate KCC2 expression by activating the TrkB receptor.…”

Section: Introductionmentioning

confidence: 99%

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Involvement of the BDNF–TrkB–KCC2 pathway in neuropathic pain after brachial plexus avulsion

Zhao

Wang

et al. 2022

Brain and Behavior

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Introduction Brachial plexus avulsion significantly increased brain‐derived neurotrophic factor (BDNF) release in the spinal cord. Here we investigated the involvement of the BDNF–TrkB–KCC2 pathway in neuropathic pain caused by BPA injury. We hypothesized that activation of BDNF–TrkB may inhibit neuronal excitability by downregulating KCC2 to maintain a high intracellular Cl‐concentration. We established a neuropathic pain rat model by avulsion of the lower trunk brachial plexus, and investigated the effects of the TrkB‐specific antibody K‐252a on the expression of BDNF, TrkB, and KCC2. Methods We randomly divided 40 male SD rats into four groups. In the brachial plexus avulsion group, C8‐T1 roots were avulsed from the spinal cord at the lower trunk level. In the K252a group, 5uL K252a was applied intrathecally daily for three days after avulsion. In the sham surgery group, expose only and without damage. The control group did not undergo any treatment. Mechanical hyperalgesia and cold allodynia were analyzed by electronic pain measuring instrument and acetone spray method at different time points on days 1, 3, 7, 10, 14, and 21 after surgery. At 21 days after surgery, the expression of BDNF and TrkB in dorsal horn neurons and GFAP in astrocytes were detected by immunohistochemistry at the C5‐T1 segment of the spinal cord. The expression levels of BDNF, TrkB, and KCC2 in the C5‐T1 spinal cord were measured by Western Blot at 7 and 21 days. Results Mechanical hyperalgesia and cold allodynia were significantly reduced in the K252a group compared with the brachial plexus avulsion group. Compared with the BPA group, BDNF, TrkB and GFAP were significantly decreased in the K252a group at 21 days after treatment by immunohistochemical test. In the WB test, the expressions of BDNF and TrkB in the K252a group were quantitatively detected to be decreased, while the expression of KCC2 was increased, which was obvious at 7 and 21 days. Conclusion BDNF‐TrkB‐KCC2 pathway can significantly relieve neuropathic pain after BPA, and is a potential target for the treatment of neuropathic pain.

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Section: Introductionmentioning

confidence: 99%