1,4-Naphthoquinone-coated BC (1,4
NQ-BC) is an important component
of PM2.5 and a representative secondary particle. However,
there is no research on the crosstalk mechanism between necroptosis
and macrophage extracellular traps (METs) after 1,4 NQ-BC exposure.
In this study, we treated RAW264.7 cells with 50, 100, and 200 mg/L
1,4 NQ-BC for 24 h, with 10 μM necrostatin-1 for 24 h, and with
2.5 μM phorbol 12-myristate 13-acetate (PMA) for 3 h. Our experiment
revealed that under normal physiological conditions, when macrophages
receive external stimuli (such as pathogens; in this experiment, PMA),
they will form METs and capture and kill pathogens, thus exerting
innate immune function. However, exposure to 1,4 NQ-BC can cause necroptosis
in macrophages, accompanied by increased levels of reactive oxygen
species (ROS) and cytosolic calcium ions, as well as the expression
disorder of inflammatory factors and chemokines, prevent the formation
of METs, lead to loss of the function of capturing and killing pathogens,
and weaken the innate immune function. Notably, inhibition of necroptosis
restored the formation of METs, indicating that necroptosis inhibited
the formation of METs. Our study was the first to explore the crosstalk
mechanism between necroptosis and METs. This experiment will enrich
the mechanism of macrophage injury caused by 1,4 NQ-BC exposure.