Autophagy changes in lung tissues of mice at 30 days after carbon black-metal ion co-exposure.

Abstract:

OBJECTIVES:Accumulating studies have investigated the PM2.5-induced pulmonary toxicity, while gaps still remain in understanding its toxic mechanism. Due to its high specific surface area and adsorption capacity similar to nanoparticles, PM2.5 acts as a significant carrier of metals in air and then leads to altered toxic effects. In this study, we aimed to use CBs and Ni as model materials to investigate the autophagy changes and pulmonary toxic effects at 30 days following intratracheal instillation of CBs-Ni mixture. MATERIALS AND METHODS:Groups of mice were instilled with 100 µL normal saline (NS), 20 µg CBs, and 4 µg Ni or CBs-Ni mixture, respectively. At 7 and 30 days post-instillation, all the mice were weighed and then sacrificed. The evaluation system was composed of the following: (a) autophagy and lysosomal function assessment, (b) trace element biodistribution observation in lungs, (c) pulmonary lavage biomedical analysis, (d) lung histopathological evaluation, (e) coefficient analysis of major organs and (f) CBs-Ni interaction and cell proliferation assessment. RESULTS:We found that after CBs-Ni co-exposure, no obvious autophagy and lysosomal dysfunction or pulmonary toxicity was detected, along with complete clearance of Ni from lung tissues as well as recovery of biochemical indexes to normal range. CONCLUSIONS:We conclude that the damaged autophagy and lysosomal function, as well as physiological function, was repaired at 30 days after exposure of CBs-Ni. Our findings provide a new idea for scientific assessment of the impact of fine particles on environment and human health, and useful information for the comprehensive treatment of air pollution.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

He W,Peng H,Ma J,Wang Q,Li A,Zhang J,Kong H,Li Q,Sun Y,Zhu Y

doi

10.1111/cpr.12813

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

e12813

issue

7

eissn

0960-7722

issn

1365-2184

journal_volume

53

pub_type

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