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Related Experiment Video

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Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber
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Ambient NO

Shuzi Ye1, Yu Ma1, Siwen Li1

  • 1Department of Health Toxicology, Xiangya School of Public Health, Central South University, Changsha 410078, China.

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|June 5, 2023
PubMed
Summary
This summary is machine-generated.

Nitrogen dioxide (NO2) exposure hinders neutrophil extracellular trap (NETs) formation, a key immune response. This study reveals NO2 impairs key signaling pathways and autophagy, impacting host defense against pathogens.

Keywords:
AutophagyMitogen-activated protein kinase (MAPK) signalingNeutrophil extracellular traps (NETs)Phosphoinositide 3-kinase (PI3K)-protein kinase B (AKT) signalingReactive oxygen species (ROS)

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Area of Science:

  • Immunology
  • Environmental Health
  • Cellular Biology

Background:

  • Nitrogen dioxide (NO2) is a known immunotoxicant, increasing susceptibility to infections.
  • Neutrophils play a crucial role in host defense via neutrophil extracellular traps (NETs).
  • The specific impact of NO2 on neutrophil function, particularly NET formation, remains understudied.

Purpose of the Study:

  • To investigate the effect of NO2 exposure on neutrophil extracellular trap (NET) formation.
  • To elucidate the underlying molecular mechanisms by which NO2 affects NETosis.
  • To explore potential therapeutic interventions against NO2-induced immunotoxicity.

Main Methods:

  • Exposure of neutrophils to 10 ppm NO2 for 15 days.
  • Analysis of NET morphology and components.
  • In vitro and in vivo studies using NO2 derivatives.
  • Assessment of respiratory burst, MAPK/PI3K-AKT signaling pathways.
  • Evaluation of autophagy markers (mTOR, LC3) and autophagic vesicles.
  • Treatment with rapamycin (Rapa) to modulate autophagy.

Main Results:

  • NO2 exposure significantly hindered NET formation.
  • NO2 suppressed respiratory burst and inhibited MAPK/PI3K-AKT signaling pathways.
  • NO2-induced inhibition of NETs was linked to impaired autophagy, evidenced by altered mTOR and LC3 expression.
  • Rapamycin treatment reversed NO2-mediated inhibition of PMA-induced NET formation.

Conclusions:

  • NO2 exposure impairs neutrophil function by inhibiting NET formation through suppression of key signaling and autophagy pathways.
  • These findings provide insights into NO2 immunotoxicity and its role in disease etiology.
  • Targeting autophagy may offer a protective strategy against NO2-induced immune dysfunction.