To investigate the role of hypoxia-induced tumor-derived exosomes in promoting CCL26 secretion and tumor-associated phenotypes in head and neck squamous cell carcinoma (HNSCC).
Key Findings:
Hypoxic exosomes altered protein levels in endothelial secretomes, increasing CCL26.
CCL26-enriched secretomes enhanced viability, migration, and invasion of HNSCC cells.
Neutralization of CCL26 and genetic silencing of CCR3 reduced tumor-associated phenotypes.
CCL26 and hypoxia-inducible factor 1 alpha were higher in tumor vs normal tissues and in metastatic vs primary tumors.
Interpretation:
Hypoxia-induced exosomes from HNSCC cells significantly reshape endothelial cell secretomes, primarily through elevated CCL26, which is associated with aggressive tumor characteristics.
Limitations:
Lack of validation under controlled hypoxic chamber conditions.
Absence of rescue experiments using recombinant CCL26.
No epitope-independent validation of CCL26 neutralization approaches.
Conclusion:
Hypoxic exosomes play a crucial role in enhancing CCL26 levels, contributing to tumor progression in HNSCC, warranting further in vivo validation.
