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Journal of Neuroinflammation
Published in: Journal of Neuroinflammation 1/2020

01-12-2020 | Neuropathic Pain | Research

Isotalatizidine, a C19-diterpenoid alkaloid, attenuates chronic neuropathic pain through stimulating ERK/CREB signaling pathway-mediated microglial dynorphin A expression

Authors: Shuai Shao, Huan Xia, Min Hu, Chengjuan Chen, Junmin Fu, Gaona Shi, Qinglan Guo, Yu Zhou, Wenjie Wang, Jiangong Shi, Tiantai Zhang

Published in: Journal of Neuroinflammation | Issue 1/2020

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Abstract

Background

Isotalatizidine is a representative C19-diterpenoid alkaloid extracted from the lateral roots of Aconitum carmichaelii, which has been widely used to treat various diseases on account of its analgesic, anti-inflammatory, anti-rheumatic, and immunosuppressive properties. The aim of this study was to evaluate the analgesic effect of isotalatizidine and its underlying mechanisms against neuropathic pain.

Methods

A chronic constrictive injury (CCI)-induced model of neuropathic pain was established in mice, and the limb withdrawal was evaluated by the Von Frey filament test following isotalatizidine or placebo administration. The signaling pathways in primary or immortalized microglia cells treated with isotalatizidine were analyzed by Western blotting and immunofluorescence.

Results

Intrathecal injection of isotalatizidine attenuated the CCI-induced mechanical allodynia in a dose-dependent manner. At the molecular level, isotalatizidine selectively increased the phosphorylation of p38 and ERK1/2, in addition to activating the transcription factor CREB and increasing dynorphin A production in cultured primary microglia. However, the downstream effects of isotalatizidine were abrogated by the selective ERK1/2 inhibitor U0126-EtOH or CREB inhibitor of KG-501, but not by the p38 inhibitor SB203580. The results also were confirmed in in vivo experiments.

Conclusion

Taken together, isotalatizidine specifically activates the ERK1/2 pathway and subsequently CREB, which triggers dynorphin A release in the microglia, eventually leading to its anti-nociceptive action.
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Metadata
Title
Isotalatizidine, a C19-diterpenoid alkaloid, attenuates chronic neuropathic pain through stimulating ERK/CREB signaling pathway-mediated microglial dynorphin A expression
Authors
Shuai Shao
Huan Xia
Min Hu
Chengjuan Chen
Junmin Fu
Gaona Shi
Qinglan Guo
Yu Zhou
Wenjie Wang
Jiangong Shi
Tiantai Zhang
Publication date
01-12-2020
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2020
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/s12974-019-1696-9

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