Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Mitochondrial damage: An important mechanism of ambient PM2.5 exposure-induced acute heart injury in rats

Language

English

Abstract

© 2015 Elsevier B.V. Epidemiological studies suggested that ambient fine particulate matter (PM2.5) exposure was associated with cardiovascular disease. However, the underlying mechanism, especially the mitochondrial damage mechanism, of PM2.5-induced heart acute injury is still unclear. In this study, the alterations of mitochondrial morphology and mitochondrial fission/fusion gene expression, oxidative stress, calcium homeostasis and inflammation in hearts of rats exposed to PM2.5 with different dosages (0.375, 1.5, 6.0 and 24.0mg/kg body weight) were investigated. The results indicated that the PM2.5 exposure induced pathological changes and ultra-structural damage in hearts such as mitochondrial swell and cristae disorder. Furthermore, PM2.5 exposure significantly increased specific mitochondrial fission/fusion gene (Fis1, Mfn1, Mfn2, Drp1 and OPA1) expression in rat hearts. These changes were accompanied by decreases of activities of superoxide dismutase (SOD), Na+K+-ATPase and Ca2+-ATPase and increases of levels of malondialdehyde (MDA), inducible nitric oxide synthase (iNOS) and nitric oxide (NO) as well as levels of pro-inflammatory mediators including TNF-α, IL-6 and IL-1β in rat hearts. The results implicate that mitochondrial damage, oxidative stress, cellular homeostasis imbalance and inflammation are potentially important mechanisms for the PM2.5-induced heart injury, and may have relations with cardiovascular disease.

Keywords

Fusion/fission, Inflammation, Oxidative stress, PM2.5, Rat heart mitochondrial damage

Publication Date

2015

Source Publication Title

Journal of Hazardous Materials

Volume

287

Start Page

392

End Page

401

Publisher

Elsevier

DOI

10.1016/j.jhazmat.2015.02.006

ISSN (print)

03043894

ISSN (electronic)

18733336

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