Mutations in foregut SOX2⁺ cells induce efficient proliferation via CXCR2 pathway

Area of Science:

• Oncology
• Molecular Biology
• Gastroenterology

Background:

• Understanding oncogene-induced transformation is key to deciphering tumor initiation and progression.
• Stratified epithelial cells, specifically SOX2+ foregut cells, are implicated in cancer development.

Purpose of the Study:

• To identify the molecular pathways driving oncogene-induced transformation in SOX2+ foregut epithelial cells.
• To elucidate the distinct roles of oncogenic KRAS and p53 deletion in tumor initiation and invasion.

Main Methods:

• Utilized genetic models with KrasG12D expression and p53 deletion in SOX2+ cells.
• Employed GFP-based lineage tracing to identify cells-of-origin for hyperplasia.
• Performed global gene expression analysis to identify upregulated pathways.

Main Results:

• SOX2+ foregut epithelial cells are prone to oncogenic transformation.
• KrasG12D expression alone is sufficient for tumor formation; p53 deletion is required for invasiveness.
• The CXCR2 pathway is crucial in driving hyperplasia induced by oncogenic KRAS.

Conclusions:

• Stratified epithelial cells can be susceptible to oncogenic insults, contributing to tumor initiation.
• The findings provide insights into distinct roles of KRAS and p53 in cancer development.
• This study aids in understanding tumor initiation and may inform novel cancer therapeutic strategies targeting pathways like CXCR2.