Cancer cells educate natural killer cells to a metastasis-promoting cell state

Area of Science:

• Immunology
• Cancer Biology
• Metastasis Research

Background:

• Natural killer (NK) cells possess significant antitumor and antimetastatic capabilities.
• Mechanisms by which cancer cells evade NK cell surveillance remain incompletely understood.
• Keratin-14 positive breast cancer cells are identified as susceptible to NK cell attack.

Purpose of the Study:

• To investigate how cancer cells escape NK cell-mediated immunity.
• To identify molecular targets for enhancing NK cell function against metastasis.
• To evaluate therapeutic strategies for preventing metastatic recurrence.

Main Methods:

• Utilized ex vivo and in vivo models of breast cancer metastasis.
• Performed gene expression analysis comparing healthy NK cells and tumor-exposed NK cells (teNK).
• Conducted receptor-ligand interaction analysis between teNK cells and tumor cells.
• Assessed the efficacy of targeting TIGIT, KLRG1, and DNA methyltransferase (DNMT) inhibitors.

Main Results:

• Exposure to cancer cells renders NK cells less cytotoxic, promoting metastasis.
• Tumor-exposed NK cells (teNK) exhibit a molecular phenotype resembling resting NK cells.
• Inhibiting TIGIT, KLRG1, or DNMTs reduced cancer colony formation.
• Combinations of DNMT inhibitors with anti-TIGIT or anti-KLRG1 antibodies significantly decreased metastatic potential.

Conclusions:

• Cancer cells can suppress NK cell cytotoxic activity, contributing to metastatic outgrowth.
• Targeting TIGIT, KLRG1, and DNMT pathways represents a promising therapeutic strategy.
• NK cell-directed therapies hold potential for preventing metastatic recurrence in the adjuvant setting.