Inhibiting cancer metastasis with water-solubilized membrane receptor CXCR4^QTY-Fc as a molecular trap

Area of Science:

• Oncology
• Molecular Biology
• Immunology

Background:

• The CXCR4/CXCL12 signaling axis is crucial for cancer metastasis and immune evasion.
• Developing effective CXCR4 inhibitors is challenging due to complex intracellular pathways and limitations of existing drugs.

Purpose of the Study:

• To engineer a novel, water-soluble molecular trap targeting the CXCR4/CXCL12 axis for broad-spectrum cancer metastasis inhibition.
• To evaluate the efficacy of the engineered CXCR4^QTY-Fc trap in preclinical cancer models.

Main Methods:

• Engineered a water-soluble CXCR4^QTY-Fc molecular trap by fusing a redesigned CXCR4 variant with the IgG1-Fc domain.
• Assessed the neutralization of CXCL12, inhibition of downstream signaling, and suppression of cancer cell migration and invasion in vitro.
• Evaluated the efficacy of CXCR4^QTY-Fc in mouse models of pancreatic, breast, and prostate cancer metastasis.

Main Results:

• CXCR4^QTY-Fc effectively neutralized CXCL12, inhibited CXCR4 signaling, and suppressed cancer cell migration and invasion in vitro.
• In vivo studies demonstrated significant reduction in tumor metastasis in pancreatic, breast, and prostate cancer models, outperforming AMD3100.
• CXCR4^QTY-Fc blocked endosomal signaling, downregulated CXCL12 in the tumor microenvironment, and inhibited tumor growth, metastasis, and angiogenesis.

Conclusions:

• The engineered CXCR4^QTY-Fc molecular trap is a potent inhibitor of cancer metastasis.
• This biomimetic, non-immunogenic approach offers a promising strategy for broad-spectrum anti-metastasis therapy across various cancers.