The molecular mechanisms of vitamin C on cell cycle regulation in B16F10 murine melanoma

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Vitamin C exhibits variable effects on cancer cells, with melanoma cells showing increased susceptibility.
• The precise mechanisms underlying vitamin C's impact on melanoma remain unclear.

Purpose of the Study:

• To investigate the effects of vitamin C on B16F10 melanoma cell proliferation and elucidate the underlying molecular mechanisms.
• To determine if vitamin C induces cell cycle arrest and identify the key signaling pathways involved.

Main Methods:

• B16F10 melanoma cells were treated with varying concentrations of vitamin C.
• Cell cycle distribution was analyzed using propidium iodide staining and flow cytometry.
• Protein levels of p53, p21Waf1/Cip1, and CDK2 were assessed.
• The activity of checkpoint kinase 2 (Chk2) was evaluated.
• The role of PI3K and ATM/ATR pathways was investigated using specific inhibitors (LY294002 and caffeine).

Main Results:

• Vitamin C suppressed B16F10 melanoma cell proliferation in a dose-dependent manner without inducing cytotoxicity.
• Vitamin C treatment resulted in cell cycle arrest at the G1 stage.
• The G1 arrest was associated with increased levels of p53 and p21Waf1/Cip1, which inhibited CDK2.
• Activation of the Chk2-p53-p21Waf1/Cip1 pathway was observed.
• Inhibitors of PI3K (LY294002) and ATM/ATR (caffeine) blocked vitamin C-induced growth arrest.

Conclusions:

• Vitamin C effectively inhibits melanoma cell proliferation by inducing G1 cell cycle arrest.
• The Chk2-p53-p21Waf1/Cip1 pathway plays a crucial role in mediating vitamin C's anti-proliferative effects on melanoma cells.
• Vitamin C shows potential as an agent to control melanoma cell proliferation through specific molecular signaling pathways.