Transcriptomics Underlying Pulmonary Ozone Pathogenesis Regulated by Inflammatory Mediators in Mice.

Area of Science:

• Environmental Health
• Molecular Biology
• Toxicology

Background:

• Ozone (O3) is a major air pollutant causing respiratory issues.
• Tumor necrosis factor receptor (TNFR) and NF-κB are key immune mediators in O3-induced lung injury.
• Previous studies implicated TNFR and NF-κB in O3 pathogenesis.

Purpose of the Study:

• To profile time-dependent lung transcriptome changes regulated by TNFR and NF-κB during subacute ozone exposure.
• To identify downstream molecular events and targets influenced by these pathways.
• To elucidate the roles of TNFR and NF-κB in O3-induced pulmonary pathogenesis.

Main Methods:

• Mice lacking TNFR or NF-κB1 were exposed to air or O3.
• Lung RNA was analyzed using cDNA microarray.
• Pathway analyses were performed to predict upstream and downstream mechanisms.

Main Results:

• Ozone exposure altered genes related to inflammation, redox, cholesterol biosynthesis, and cell cycle.
• TNFR deficiency suppressed immune cell proliferation and lipid processes, enhancing epithelial integrity.
• NF-κB1 deficiency impaired lung cell cycle progression during O3 exposure.
• Commonly regulated genes like IL6 and CASP8 were predicted to protect against lung injury.

Conclusions:

• TNFR and NF-κB1 signaling pathways play critical roles in regulating the lung's response to ozone.
• Specific genes, such as IL6, demonstrate protective functions against ozone-induced lung injury.
• This research provides insights into the molecular mechanisms underlying ozone-induced lung pathogenesis.