Back to Journals » Neuropsychiatric Disease and Treatment » Volume 16

Methyl Jasmonate Protects Microglial Cells Against β-Amyloid-Induced Oxidative Stress and Inflammation via Nrf2-Dependent HO-1 Pathway

Authors Li H, Lv L, Wu C, Qi J, Shi B

Received 4 December 2019

Accepted for publication 31 March 2020

Published 4 June 2020 Volume 2020:16 Pages 1399—1410


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 5

Editor who approved publication: Dr Yuping Ning

Hua Li,1,* Limei Lv,2,* Chunyan Wu,3 Jisheng Qi,4 Baolin Shi5

1Department of Neurology, Anqiu People’s Hospital, Anqiu 262100, Shandong, People’s Republic of China; 2Department of Neurology, Traditional Chinese Medical Hospital of Anqiu, Anqiu 262100, People’s Republic of China; 3Department of Neurology, Affiliated Hospital of Weifang Medical College, Weifang 261031, Shandong, People’s Republic of China; 4Department of Rehabilitation Medicine, Shandong Rongjun General Hospital, Jinan 250000, Shandong, People’s Republic of China; 5Department of Neurology, Weifang People’s Hospital, Weifang 261031, Shandong, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Baolin Shi
Department of Neurology, Weifang People’s Hospital, No. 151 Guangwen Street, Kuiwen District, Weifang 261031, Shandong, People’s Republic of China
Tel +86-15965096500
Email [email protected]

Background: β-Amyloid (Aβ) induces oxidative stress and inflammation of microglial cells, thus leading to Alzheimer’s disease. Methyl jasmonate (MeJA) is reported to have anti-inflammatory and anti-oxidant effects. However, the potential roles of MeJA in Aβ-induced cell activities and the underlying mechanism are unclear.
Methods: Microglial cell line BV-2 was stimulated by 20 μM Aβ and/or 20 μM MeJA and then divided into four groups (control, Aβ, MeJA, and Aβ+MeJA). Cell viability was detected by MTT assay. MDA, SOD activity, and ROS were detected by fluorescence spectrophotometry and immunofluorescence assay. Nrf2 and HO-1 were detected by qRT-PCR and Western blot. Furthermore, inflammatory cytokines (p-NFκB, TLR4, TNF-α, IL-1β, and IL-6) and apoptosis factors (Bcl-2, Bax, and cl-casp-3) were detected by Western blot. TUNEL assay was applied to investigate apoptosis rate. Moreover, the mechanism of how MeJA played anti-oxidative stress and anti-inflammatory roles was investigated by silencing of Nrf2 via siRNA.
Results: The result of MTT assay showed that MeJA improved the decreased viability of BV-2 cells induced by Aβ. The detection of MDA, SOD activity, and ROS showed the oxidative stress levels were decreased in Aβ+MeJA group compared with Aβ group. Nrf2, HO-1, and SOD were significantly up-regulated in Aβ+MeJA group compared with Aβ group (p< 0.01). In contrast, inflammatory cytokines were significantly down-regulated in Aβ+MeJA group compared with Aβ group (p< 0.05). Similarly, the expressions of apoptosis cytokines and TUNEL assay suggested a decreased apoptosis rate in Aβ+MeJA group compared to Aβ group (p< 0.01). Finally, results of Nrf2 knockdown experiment showed down-regulations of anti-oxidative stress factors (Nrf2, HO-1 and SOD), up-regulations of inflammatory cytokines, and increased ratio of Bax to Bcl in Aβ+MeJA+si-Nrf2 group compared with Aβ+MeJA group (p< 0.01).
Conclusion: MeJA could relieve Aβ-induced oxidative stress and inflammatory response in microglial cells by activating Nrf2/HO-1 pathway.

Keywords: methyl jasmonate, Nrf2-dependent HO-1 pathway, β-amyloid, oxidative stress, inflammatory cytokines

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.

Download Article [PDF]  View Full Text [HTML][Machine readable]