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Quinovic Acid Enhances the Cytotoxicity of KHYG-1 Cells by Modulating the Ras/MAPK Signalling Pathway and
Ming-Ju Hsieh1,2,3,4, Jen-Tsun Lin5, Yi-Ching Chuang1
1Oral Cancer Research Center, Changhua Christian Hospital, Changhua, Taiwan.
Quinovic acid from cat's claw boosts natural killer (NK) cell activity. This compound enhances cancer cell killing and apoptosis, showing potential as a novel cancer therapy.
Area of Science:
- Immunology
- Pharmacology
- Natural Products
Background:
- Quinovic acid, a component of Uncaria tomentosa (cat's claw), possesses known antioxidant and anti-inflammatory properties.
- Natural killer (NK) cells are crucial for innate immunity and cancer surveillance.
- Enhancing NK cell activity is a promising strategy for cancer immunotherapy.
Purpose of the Study:
- To investigate the effects of quinovic acid on NK cell activity and cytotoxicity.
- To elucidate the molecular mechanisms underlying quinovic acid-mediated NK cell enhancement.
- To evaluate the therapeutic potential of quinovic acid against cancer cells.
Main Methods:
- Utilized the KHYG-1 NK cell line and K562 cancer cells for in vitro studies.
- Assessed the expression of key molecules involved in NK cell cytotoxicity and apoptosis.
- Analyzed the activation of signaling pathways (Ras/MAPK, PI3K/AKT/mTOR) and transcription factors (CREB, STAT4).
- Investigated effects on DNA repair mechanisms in target cells.
- Examined NK cells from patients with head and neck squamous cell carcinoma.
Main Results:
- Quinovic acid upregulated cytolytic molecules (perforin, granzymes, Fas ligand, granulysin) and induced CREB/STAT4 phosphorylation, enhancing NK cell cytotoxicity.
- It promoted apoptosis in cancer cells by increasing cleaved caspases and PARP, while inhibiting DNA repair proteins (SET, Ape1, HMGB2).
- Quinovic acid stimulated interferon-gamma secretion via Ras/MAPK and PI3K/AKT/mTOR pathways, activated by NK receptors like NKG2D.
- Similar effects were observed in other cancer cell lines and primary patient-derived NK cells.
Conclusions:
- Quinovic acid significantly enhances NK cell cytotoxicity and promotes cancer cell apoptosis.
- It modulates key signaling pathways and inhibits DNA repair mechanisms in target cells.
- Quinovic acid demonstrates considerable promise as a therapeutic agent for various cancers by boosting innate immune responses.
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