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  4. Exposure to PM2.5 induces neurotoxicity, mitochondrial dysfunction, oxidative stress and inflammation in human SH-SY5Y neuronal cells
 
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Exposure to PM2.5 induces neurotoxicity, mitochondrial dysfunction, oxidative stress and inflammation in human SH-SY5Y neuronal cells

Journal
NeuroToxicology
Journal Volume
88
Pages
25-35
Date Issued
2022
Author(s)
Lin C.-H
Nicol C.J.B
Wan C
SHIANG-JIUUN CHEN  
RONG-NAN HUANG  
Chiang M.-C.
DOI
10.1016/j.neuro.2021.10.009
URI
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85118888685&doi=10.1016%2fj.neuro.2021.10.009&partnerID=40&md5=07a0c5510a21d7cb21cdb312efce4dda
https://scholars.lib.ntu.edu.tw/handle/123456789/606105
Abstract
Ambient air pollution is a global public health issue. Recent evidence suggests that exposure to fine aerosolized particulate matter (PM) as small as ?2.5 microns (PM2.5) is neurotoxic to brain structures. Many studies also suggest exposure to PM2.5 may cause neurotoxicity and affect brain function. However, the molecular mechanisms by which PM2.5 exerts these effects are not fully understood. Thus, we evaluated the hypothesis that PM2.5 exposure exerts its neurotoxic effects via increased oxidative and inflammatory cellular damage and mitochondrial dysfunction using human SH-SY5Y neuronal cells. Here, we show PM2.5 exposure significantly decreases viability, and increases caspase 3 and 9 protein expression and activity in SH-SY5Y cells. In addition, PM2.5 exposure decreases SH-SY5Y survival, disrupts cell and mitochondrial morphology, and significantly decreases ATP levels, D-loop levels, and mitochondrial mass and function (maximal respiratory function, COX activity, and mitochondrial membrane potential) in SH-SY5Y cells. Moreover, SH-SY5Y cells exposed to PM2.5 have significantly decreased mRNA and protein expression levels of survival genes (CREB and Bcl-2) and neuroprotective genes (PPARγ and AMPK). We further show SH-SY5Y cells exposure to PM2.5 induces significant increases in the levels of oxidative stress, and expression levels of the inflammatory mediator's TNF-α, IL-1β, and NF-κB. Taken together, these results provide the first evidence of the biochemical, molecular and morphological effects of PM2.5 on human neuronal SH-SY5Y cells, and support our hypothesis that increased mitochondrial disruption, oxidative stress and inflammation are critical mediators of its neurotoxic effects. These findings further improve our understanding of the neuronal cell impact of PM2.5 exposure, and may be useful in the design of strategies for the treatment and prevention of human neurodegenerative disorders. ? 2021 Elsevier B.V.
Subjects
Human neuronal cells
Inflammation
Mitochondrial dysfunction
Neurotoxicity
Oxidative stress
PM2.5
SDGs

[SDGs]SDG3

[SDGs]SDG11

Publisher
Elsevier B.V.
Type
journal article

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