Pathomechanism characterization and potential therapeutics identification for SCA3 targeting neuroinflammation

Ya Jen Chiu, Shu An Lin, Wan Ling Chen, Te Hsien Lin, Chih Hsin Lin, Ching Fa Yao, Wenwei Lin, Yih Ru Wu, Kuo Hsuan Chang, Guey Jen Lee-Chen, Chiung Mei Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Polyglutamine (polyQ)-mediated spinocerebellar ataxias (SCA) are caused by mutant genes with expanded CAG repeats encoding polyQ tracts. The misfolding and aggregation of polyQ proteins result in increased reactive oxygen species (ROS) and cellular toxicity. Inflammation is a common manifestation of oxidative stress and inflammatory process further reduces cellular antioxidant capacity. Increase of activated microglia in the pons of SCA type 3 (SCA3) patients suggests the involvement of neuroinflammation in the disease pathogenesis. In this study, we evaluated the anti-inflammatory potentials of indole compound NC009-1, 4-aminophenol-arachidonic acid derivative AM404, quinoline compound VB-037 and chalcone-coumarin derivative LM-031 using human HMC3 microglia and SCA3 ATXN3/Q75-GFP SH-SY5Y cells. The four tested compounds displayed anti-inflammatory activity by suppressing NO, IL-1β, TNF-α and IL-6 production and CD68 expression of IFN-γ-activated HMC3 microglia. In retinoic acid-differentiated ATXN3/Q75-GFP SH-SY5Y cells inflamed with IFN-γ-primed HMC3 conditioned medium, treatment with the tested compounds mitigated the increased caspase 1 activity and lactate dehydrogenase release, reduced polyQ aggregation and ROS and/or promoted neurite outgrowth. Examination of IL-1β- and TNF-α-mediated signaling pathways revealed that the tested compounds decreased IκBα/P65, JNK/JUN and/or P38/STAT1 signaling. The study results suggest the potential of NC009-1, AM404, VB-037 and LM-031 in treating SCA3 and probable other polyQ diseases.

Original languageEnglish
Pages (from-to)23619-23646
Number of pages28
JournalAging
Volume12
Issue number23
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • IL-1β
  • IkBα/P65
  • JNK/JUN
  • P38/STAT1
  • spinocerebellar ataxia 3/ATXN3
  • therapeutics

ASJC Scopus subject areas

  • Ageing
  • Cell Biology

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