Effects of exposure to ambient fine particulate matter on the heart of diet-induced obesity mouse model

Yuanyuan Song, Zenghua Qi, Yanhao Zhang, Juntong Wei, Xiaoliang Liao, Ruijin Li, Chuan Dong, Lin Zhu, Zhu YANG, Zongwei CAI*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Exposure to fine particulate matter (PM2.5) is associated with decreased cardiac function, especially in high risk populations such as obese ones. In this study, impacts of PM2.5 exposure on cardiac function were investigated by using the diet-induced obesity mice model. Mice were fed with normal diet or high-fat diet (HFD) for four weeks and then exposed to phosphate-buffered solution or Taiyuan winter PM2.5 (0.25 mg/kg body/day) through intratracheal instillation for another four weeks. Among physiological indices recorded, heart rate and blood pressure were increased after PM2.5 exposure in the heart of the obese mice. Metabolomics and lipidomics were applied to explore molecular alterations in response to the co-treatment of PM2.5 and HFD. Our results demonstrated both direct impacts on cardiac function and indirect effects resulted from the injury of other organs. Inflammation of lung and hypothalamus may be responsible for the elevation of phenylalanine metabolism in serum and its downstream products: epinephrine and norepinephrine, the catecholamines involves in regulating cardiac system. In intracardiac system, the co-treatment led to imbalance of energy metabolism, in addition to oxidative stress and inflammation. In contrast to the upregulation of glucose and fatty acids uptake and CoA synthesis, levels of ATP, acetyl-CoA and the intermediates in glycolysis pathway decreased in the heart. The results indicated that energy metabolism disorder was possibly one of the important contributing factors to the more severe adverse effects of the combined treatment of HFD and PM2.5.

Original languageEnglish
Article number139304
JournalScience of the Total Environment
Volume732
DOIs
Publication statusPublished - 25 Aug 2020

Scopus Subject Areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

User-Defined Keywords

  • Cardiac function
  • Energy metabolism
  • High-fat diet
  • Lipidomics
  • Metabolomics
  • PM

Fingerprint

Dive into the research topics of 'Effects of exposure to ambient fine particulate matter on the heart of diet-induced obesity mouse model'. Together they form a unique fingerprint.

Cite this