Therapeutic potential and challenges of natural killer cells in treatment of solid tumors

Area of Science:

• Immunology
• Cancer Biology
• Immunotherapy

Background:

• Natural killer (NK) cells are crucial innate immune cells with significant therapeutic potential for various cancers.
• Their cytotoxic mechanisms, involving direct cell engagement and targeted granule release, have led to extensive exploration in hematological malignancies.
• NK cells' ability to eliminate antibody-coated, stem, and genitoxically altered cells, while tolerating healthy cells, makes them attractive for all cancer types, including metastatic disease.

Purpose of the Study:

• To review the literature on how the tumor microenvironment (TME) manipulates NK cell functions to promote immune evasion.
• To highlight strategies for augmenting NK cell anti-tumor activity.
• To critically evaluate the challenges and opportunities of NK cell-based therapies in solid tumors.

Main Methods:

• Literature review focusing on NK cell receptor-ligand interactions and TME manipulation.
• Analysis of mechanisms underlying NK cell evasion by tumors.
• Examination of clinical trials involving NK cell therapy in solid malignancies.

Main Results:

• The TME employs complex mechanisms to subvert NK cell phenotypes, genotypes, and tropism, hindering tumor recognition and elimination.
• Despite challenges, NK cells can reverse the immunosuppressive TME and enhance adaptive immunity through cytokine release.
• Understanding NK cell receptor-ligand interactions is key, but their complexity presents challenges.

Conclusions:

• NK cell-based immunotherapy holds significant promise for diverse cancers, including solid tumors.
• Overcoming TME-mediated NK cell suppression is critical for therapeutic success.
• Further research and clinical trials are needed to optimize NK cell therapy efficacy in solid malignancies.