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Published on: October 5, 2012
Vitamin C induces human melanoma A375 cell apoptosis via Bax- and Bcl-2-mediated mitochondrial pathways
Xiao-Yu Chen1, Ying Chen1, Chuan-Jun Qu1
1School of Integrated Traditional Chinese and Western Medicine, Binzhou Medical University, Yantai, Shandong 264003, P.R. China.
Abstract:
Melanoma is the most malignant type of skin cancer and is resistant to numerous chemotherapeutic and radiotherapy-based treatment approaches due to the activation of rapid and reversible pro-survival signaling pathways. As a result, patients will often present with a poor prognosis. Therefore, novel preventive methods and treatments are urgently required for patients with melanoma. Vitamin C (also known as L-ascorbic acid) is a water-soluble vitamin that is widely used as a dietary additive and has been demonstrated to exhibit anti-cancer properties. In the present study, the effects of vitamin C in human melanoma A375 cells, and the mechanisms underlying these effects were investigated. Vitamin C potently suppressed human melanoma A375 cell proliferation by inducing apoptosis in A375 cells. Induction of apoptosis was related to caspase-9 and caspase-3 activation and the mitochondrial membrane potential of A375 cells significantly decreased in the presence of vitamin C. Furthermore, vitamin C induced apoptosis in A375 cells by activating the Bax- and Bcl-2-mediated mitochondrial pathway. These results indicate that vitamin C may be a potentially useful clinical anti-tumor drug for treating patients with melanoma.
Insights
Vitamin C effectively inhibits melanoma cell growth by triggering programmed cell death (apoptosis). This vitamin activates key proteins and disrupts mitochondrial function, offering a potential new treatment for melanoma patients.
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Melanoma is an aggressive skin cancer with poor prognosis due to treatment resistance.
- Novel therapeutic strategies are needed to combat melanoma effectively.
Purpose of the Study:
- To investigate the anti-cancer effects of Vitamin C (L-ascorbic acid) on human melanoma A375 cells.
- To elucidate the underlying molecular mechanisms of Vitamin C's action in melanoma.
Main Methods:
- Treatment of human melanoma A375 cells with Vitamin C.
- Assessment of cell proliferation, apoptosis induction, and caspase activation (caspase-9, caspase-3).
- Evaluation of mitochondrial membrane potential and expression of apoptosis-related proteins (Bax, Bcl-2).
Main Results:
- Vitamin C significantly suppressed melanoma A375 cell proliferation.
- Vitamin C induced apoptosis in A375 cells, evidenced by caspase-9 and caspase-3 activation.
- A decrease in mitochondrial membrane potential and activation of the Bax/Bcl-2 pathway were observed.
Conclusions:
- Vitamin C demonstrates potent anti-proliferative and apoptosis-inducing effects on human melanoma cells.
- The mechanism involves the mitochondrial pathway, including caspase activation and modulation of Bax and Bcl-2.
- Vitamin C shows potential as a clinical anti-tumor agent for melanoma treatment.
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