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Harnessing NK Cells to Control Metastasis
Xuewen Deng1, Hiroshi Terunuma1,2
1Biotherapy Institute of Japan Inc., 2-4-8 Edagawa, Koto-ku, Tokyo 135-0051, Japan.
Abstract:
In recent years, tumor immunotherapy has produced remarkable results in tumor treatment. Nevertheless, its effects are severely limited in patients with low or absent pre-existing T cell immunity. Accordingly, metastasis remains the major cause of tumor-associated death. On the other hand, natural killer (NK) cells have the unique ability to recognize and rapidly act against tumor cells and surveil tumor cell dissemination. The role of NK cells in metastasis prevention is undisputable as an increase in the number of these cells mostly leads to a favorable prognosis. Hence, it is reasonable to consider that successful metastasis involves evasion of NK-cell-mediated immunosurveillance. Therefore, harnessing NK cells to control metastasis is promising. Circulating tumor cells (CTCs) are the seeds for distant metastasis, and the number of CTCs detected in the blood of patients with tumor is associated with a worse prognosis, whereas NK cells can eliminate highly motile CTCs especially in the blood. Here, we review the role of NK cells during metastasis, particularly the specific interactions of NK cells with CTCs, which may provide essential clues on how to harness the power of NK cells against tumor metastasis. As a result, a new way to prevent or treat metastatic tumor may be developed.
Insights
Natural killer (NK) cells can combat tumor metastasis by eliminating circulating tumor cells (CTCs). Harnessing NK cell activity offers a promising strategy to prevent or treat metastatic cancer, especially when T cell immunity is low.
Area of Science:
- Immunology
- Oncology
- Cancer Metastasis
Background:
- Tumor immunotherapy shows promise but is limited in patients with low T cell immunity.
- Metastasis remains a primary cause of cancer-related mortality.
- Natural killer (NK) cells possess inherent tumor-cell recognition and elimination capabilities.
Purpose of the Study:
- To review the critical role of NK cells in preventing tumor metastasis.
- To explore the interactions between NK cells and circulating tumor cells (CTCs).
- To identify strategies for leveraging NK cells to control cancer spread.
Main Methods:
- Literature review focusing on NK cell function in metastasis.
- Analysis of NK cell interactions with circulating tumor cells (CTCs).
- Examination of NK cell-mediated immunosurveillance evasion by tumors.
Main Results:
- NK cells are crucial for preventing metastasis and surveilling tumor cell dissemination.
- Increased NK cell numbers correlate with improved patient prognosis.
- Tumor metastasis involves evasion of NK cell-mediated attacks.
- NK cells can eliminate motile CTCs, impacting metastatic potential.
Conclusions:
- Harnessing NK cells presents a promising therapeutic avenue for controlling tumor metastasis.
- Understanding NK cell-CTC interactions can guide the development of novel anti-metastasis treatments.
- Targeting NK cell activity may overcome limitations of traditional immunotherapies in metastatic disease.
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