TY - JOUR
T1 - Automobile diesel exhaust particles induce lipid droplet formation in macrophages in vitro
AU - Cao, Yi
AU - Jantzen, Kim
AU - Gouveia, Ana Cecilia Damiao
AU - Skovmand, Astrid
AU - Roursgaard, Martin
AU - Loft, Steffen
AU - Møller, Peter
N1 - Copyright © 2015 Elsevier B.V. All rights reserved.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Exposure to diesel exhaust particles (DEP) has been associated with adverse cardiopulmonary health effects, which may be related to dysregulation of lipid metabolism and formation of macrophage foam cells. In this study, THP-1 derived macrophages were exposed to an automobile generated DEP (A-DEP) for 24h to study lipid droplet formation and possible mechanisms. The results show that A-DEP did not induce cytotoxicity. The production of reactive oxygen species was only significantly increased after exposure for 3h, but not 24h. Intracellular level of reduced glutathione was increased after 24h exposure. These results combined indicate an adaptive response to oxidative stress. Exposure to A-DEP was associated with significantly increased formation of lipid droplets, as well as changes in lysosomal function, assessed as reduced LysoTracker staining. In conclusion, these results indicated that exposure to A-DEP may induce formation of lipid droplets in macrophages in vitro possibly via lysosomal dysfunction.
AB - Exposure to diesel exhaust particles (DEP) has been associated with adverse cardiopulmonary health effects, which may be related to dysregulation of lipid metabolism and formation of macrophage foam cells. In this study, THP-1 derived macrophages were exposed to an automobile generated DEP (A-DEP) for 24h to study lipid droplet formation and possible mechanisms. The results show that A-DEP did not induce cytotoxicity. The production of reactive oxygen species was only significantly increased after exposure for 3h, but not 24h. Intracellular level of reduced glutathione was increased after 24h exposure. These results combined indicate an adaptive response to oxidative stress. Exposure to A-DEP was associated with significantly increased formation of lipid droplets, as well as changes in lysosomal function, assessed as reduced LysoTracker staining. In conclusion, these results indicated that exposure to A-DEP may induce formation of lipid droplets in macrophages in vitro possibly via lysosomal dysfunction.
U2 - 10.1016/j.etap.2015.06.012
DO - 10.1016/j.etap.2015.06.012
M3 - Journal article
C2 - 26122084
SN - 1382-6689
VL - 40
SP - 164
EP - 171
JO - Environmental Toxicology and Pharmacology
JF - Environmental Toxicology and Pharmacology
IS - 1
ER -