Objective:

To investigate the role of IL-17A in promoting NET formation, epithelial-mesenchymal transition (EMT), and brain metastasis in lung adenocarcinoma (LUAD), highlighting its significance in cancer progression.

Key Findings:

• IL-17A stimulation in neutrophils induced NET formation associated with EP300-mediated increased acetylation of H2BC4, facilitating tumor progression.
• NETs activated IL17 signaling, driving EMT and brain metastasis in LUAD.
• NETs enhanced tumor metastasis to the brain, significantly suppressed by PAD inhibitors or DNase I, indicating therapeutic potential.
• Acetylated H2BC4, p300, c-Jun, and c-Fos were enriched at the promoter regions of EMT-related genes, suggesting a regulatory network.

Interpretation:

IL-17A induces NET formation, linked to increased H2BC4 expression and acetylation during the EMT process and brain metastasis of LUAD, with implications for targeted therapies.

Limitations:

• Potential limitations include the specificity of the models used and the generalizability of findings to clinical settings.

Conclusion:

The findings suggest a potential association between the IL-17A/NETs/H2BC4 pathway and the progression of brain metastasis, indicating possible therapeutic targets for LUAD that warrant further investigation.