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α-Pinene Enhances the Anticancer Activity of Natural Killer Cells via ERK/AKT Pathway
Hantae Jo1, Byungsun Cha2, Haneul Kim2
1Department of Applied Biotechnology, Ajou University, Suwon 16499, Korea.
Abstract:
Natural killer (NK) cells are lymphocytes that can directly destroy cancer cells. When NK cells are activated, CD56 and CD107a markers are able to recognize cancer cells and release perforin and granzyme B proteins that induce apoptosis in the targeted cells. In this study, we focused on the role of phytoncides in activating NK cells and promoting anticancer effects. We tested the effects of several phytoncide compounds on NK-92mi cells and demonstrated that α-pinene treatment exhibited higher anticancer effects, as observed by the increased levels of perforin, granzyme B, CD56 and CD107a. Furthermore, α-pinene treatment in NK-92mi cells increased NK cell cytotoxicity in two different cell lines, and immunoblot assays revealed that the ERK/AKT pathway is involved in NK cell cytotoxicity in response to phytoncides. Furthermore, CT-26 colon cancer cells were allografted subcutaneously into BALB/c mice, and α-pinene treatment then inhibited allografted tumor growth. Our findings demonstrate that α-pinene activates NK cells and increases NK cell cytotoxicity, suggesting it is a potential compound for cancer immunotherapy.
Insights
Alpha-pinene, a natural compound, activates natural killer (NK) cells to enhance their cancer-fighting abilities. This research suggests alpha-pinene as a promising agent for novel cancer immunotherapies.
Area of Science:
- Immunology
- Natural Products Chemistry
- Cancer Research
Background:
- Natural killer (NK) cells are crucial lymphocytes with direct cytotoxic capabilities against cancer cells.
- NK cell activation involves specific markers (CD56, CD107a) and the release of cytotoxic proteins (perforin, granzyme B) to induce apoptosis.
- Phytoncides, plant-derived volatile compounds, are being investigated for their potential immunomodulatory and anticancer effects.
Purpose of the Study:
- To investigate the role of phytoncides, specifically alpha-pinene, in activating NK cells and enhancing their anticancer functions.
- To elucidate the molecular pathways involved in NK cell activation by phytoncides.
- To evaluate the in vivo efficacy of alpha-pinene against established tumors.
Main Methods:
- Testing various phytoncide compounds on NK-92mi cells to assess anticancer effects.
- Measuring levels of NK cell markers (CD56, CD107a) and cytotoxic proteins (perforin, granzyme B) post-treatment.
- Evaluating NK cell cytotoxicity against cancer cell lines.
- Utilizing immunoblot assays to identify the involvement of signaling pathways (ERK/AKT).
- Conducting in vivo studies using a mouse model with CT-26 colon cancer allografts.
Main Results:
- Alpha-pinene treatment significantly increased the levels of perforin, granzyme B, CD56, and CD107a in NK-92mi cells.
- Alpha-pinene enhanced NK cell-mediated cytotoxicity against two different cancer cell lines.
- The ERK/AKT pathway was identified as a key mediator of NK cell cytotoxicity induced by phytoncides.
- Subcutaneous administration of alpha-pinene inhibited the growth of CT-26 colon cancer allografts in mice.
Conclusions:
- Alpha-pinene effectively activates NK cells and potentiates their cytotoxic activity against cancer cells.
- The findings highlight the involvement of the ERK/AKT pathway in phytoncide-induced NK cell activation.
- Alpha-pinene demonstrates significant in vivo anticancer effects, positioning it as a potential candidate for cancer immunotherapy development.
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