Δ133p53 isoform enhances TLR4 function to promote tumor growth

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Tumour protein 53 (TP53) is a tumor suppressor frequently mutated in cancer.
• TP53 isoforms, including the Δ133p53 family, can paradoxically promote tumor growth and metastasis.
• Targeting Δ133p53 function presents a potential therapeutic strategy against cancer metastasis.

Purpose of the Study:

• To identify cell surface proteins involved in Δ133p53-mediated tumor promotion.
• To investigate the role of toll-like receptor 4 (TLR4) in Δ133p53-driven tumor progression.
• To evaluate the therapeutic potential of targeting cell surface changes in Δ133p53-expressing tumors.

Main Methods:

• Characterization of cell surface protein expression in a mouse model with tumors expressing Δ122p53 (a Δ133p53 family member).
• Inhibition of cell surface trafficking and TLR4 signaling.
• Assessment of tumor growth and metastasis following therapeutic interventions.

Main Results:

• Inhibition of cell surface trafficking reduced tumor growth and metastasis in the mouse model.
• Increased expression of toll-like receptor 4 (TLR4) and apoptosis inhibitor 5 was observed on the cell surface of Δ133p53/Δ122p53-expressing cells.
• Inhibition of TLR4 signaling was sufficient to decrease Δ122p53 tumor growth.

Conclusions:

• Δ133p53 contributes to tumor progression by stimulating TLR4 function.
• Targeting cell surface protein alterations, specifically TLR4, can inhibit Δ133p53-mediated tumor promotion.
• These findings suggest novel therapeutic strategies for cancers with altered TP53 isoforms.