Isorhamnetin Attenuated the Release of Interleukin-6 from β-Amyloid-Activated Microglia and Mitigated Interleukin-6-Mediated Neurotoxicity. (15th September 2022)

• Record Type: Journal Article
• Authors: Wei, Pei-Cih; Lee-Chen, Guey-Jen; Chen, Chiung-Mei; Chen, Ying; Lo, Yen-Shi; Chang, Kuo-Hsuan
• Other Names: Rios Francisco Academic Editor.
• Is Part Of: Oxidative medicine and cellular longevity. Volume 2022(2022)
• Publication Date: 2022-09-15
• Subjects: Oxidative stress -- Periodicals; Cells -- Aging -- Periodicals; Cells -- Aging; Oxidative stress; Oxidative Stress -- Periodicals; Cell Aging -- Periodicals; Periodicals; 611.0181
• DOI: 10.1155/2022/3652402
• Languages: English
• ISSNs: 1942-0900

Abstract

Abstract : Alzheimer's disease (AD), characterized by the abnormal accumulation of β -amyloid (A β ), is the most prevalent type of dementia, and it is associated with progressive cognitive decline and memory loss. A β accumulation activates microglia, which secrete proinflammatory factors associated with A β clearance impairment and cause neurotoxicity, generating a vicious cycle among A β accumulation, activated microglia, and proinflammatory factors. Blocking this cycle can be a therapeutic strategy for AD. Using A β -activated HMC3 microglial cells, we observed that isorhamnetin, a main constituent of Oenanthe javanica, reduced the A β -triggered secretion of interleukin- (IL-) 6 and downregulated the expression levels of the microglial activation markers ionized calcium binding adaptor molecule 1 (IBA1) and CD11b and the inflammatory marker nuclear factor- κ B (NF- κ B). Treatment of the SH-SY5Y-derived neuronal cells with the A β -activated HMC3-conditioned medium (HMC3-conditioned medium) or IL-6 increased reactive oxygen species production, upregulated cleaved caspase 3 expression, and reduced neurite outgrowth, whereas treatment with isorhamnetin counteracted these neurodegenerative presentations. In the SH-SY5Y-derived neuronal cells, IL-6 upregulated the phosphorylation of tyrosine kinase 2 (TYK2) and signal transducer and activator of transcription 1 (STAT1), whereas isorhamnetin normalized this abnormal phosphorylation. Overexpression of TYK2 attenuated the neuroprotective effect of isorhamnetin on IL-6-induced neurotoxicity. Our findings demonstrate that isorhamnetin exerts its neuroprotective effect by mediating the neuroinflammatory IL-6/TYK2 signaling pathway, suggesting its potential for treating AD.