Abstract
Previous studies have demonstrated that tumor necrosis factor-alpha (TNF-α) in the red nucleus (RN) plays a facilitated role in the development of neuropathic pain. Here, we further investigated the expression changes and roles of the downstream signaling molecules of the red nucleus TNF-α, including nuclear factor-kappa B (NF-κB), extracellular signal-regulated kinase (ERK), p38 mitogen-activated protein kinase (MAPK) and c-Jun N-terminal kinase (JNK), in the initiation and maintenance of neuropathic pain induced by spared nerve injury (SNI). Immunohistochemistry demonstrated that increased expressions of NF-κB, phospho-ERK (p-ERK) and p-p38 MAPK were observed in the RN contralateral (but not ipsilateral) to the nerve injury side at 3 days after SNI compared with sham-operated and normal rats, the up-regulations of NF-κB and p-ERK but not p-p38 MAPK remained at high levels till 14 days later. An elevated expression of p-JNK occurred at 14 days (but not 3 and 7 days) after SNI, which was later than those of NF-κB, p-ERK and p-p38 MAPK. The up-regulations of NF-κB, p-ERK, p-p38 MAPK and p-JNK all could be abolished by microinjection of anti-TNF-α antibody into the RN of rats with SNI. Microinjection of NF-κB inhibitor PDTC, ERK inhibitor PD98059, p38 MAPK inhibitor SB203580 but not JNK inhibitor SP600125 into the RN contralateral to the nerve injury side at 3 days postinjury significantly alleviated SNI-induced mechanical allodynia. In addition, microinjection of PDTC, PD98059 and SP600125 but not SB203580 into the RN at 14 days postinjury significantly alleviated SNI-induced mechanical allodynia. These results suggest that the red nucleus TNF-α produces the algesic effect through activating NF-κB, ERK and p38 MAPK in the early initiation stage but relying on the activation of NF-κB, ERK and JNK in the later maintenance stage of SNI-induced neuropathic pain.
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The project was sponsored by the National Natural Science Foundation of China (No. 31070979) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
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Zhang, Q., Yu, J., Wang, J. et al. The Red Nucleus TNF-α Participates in the Initiation and Maintenance of Neuropathic Pain Through Different Signaling Pathways. Neurochem Res 40, 1360–1371 (2015). https://doi.org/10.1007/s11064-015-1599-9
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DOI: https://doi.org/10.1007/s11064-015-1599-9