Low-dose ionizing radiation drives thyroid carcinogenesis via VPS53 enhanced EGFR Re-recycling.

Area of Science:

• Oncology
• Molecular Biology
• Environmental Health

Background:

• Ionizing radiation is a known cause of thyroid cancer.
• The mechanisms of low-dose radiation (LDR)-induced thyroid carcinogenesis are not fully understood.
• VPS53's role in LDR-induced thyroid tumorigenesis is uncharacterized.

Purpose of the Study:

• To investigate the role of VPS53 in LDR-induced thyroid carcinogenesis.
• To elucidate the molecular mechanisms by which VPS53 contributes to thyroid tumor development.
• To identify potential therapeutic targets for LDR-induced thyroid cancer.

Main Methods:

• Analysis of VPS53 copy number and expression in LDR-transformed thyroid cells.
• Cell proliferation and clonal formation assays.
• Xenograft tumor experiments in nude mice.
• Investigation of VPS53 interaction with EGFR and its effect on protein trafficking.
• Assessment of VPS53's impact on DNA double-strand break repair pathways (NHEJ vs. HR).

Main Results:

• LDR exposure increased VPS53 copy number and expression in thyroid cells.
• High VPS53 expression correlated with poor prognosis in thyroid cancer patients.
• VPS53 promoted thyroid cancer cell proliferation, clonal formation, and tumor growth in vivo.
• VPS53 interacts with EGFR, promoting its recycling and sustained activation.
• VPS53 shifted DNA repair towards NHEJ, increasing genomic instability.

Conclusions:

• VPS53 is a key driver in LDR-induced thyroid carcinogenesis.
• The VPS53-EGFR axis promotes thyroid tumorigenesis by sustaining signaling pathways and genomic instability.
• VPS53 represents a novel therapeutic target for thyroid cancer.