Sulforaphane-induced apoptosis involves p53 and p38 in melanoma cells

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Malignant melanoma exhibits complex reprogramming of cell death and survival pathways, leading to chemoresistance and poor prognosis.
• Sulforaphane (SF), a compound from cruciferous plants, has demonstrated antiproliferative and proapoptotic activity in various cancer cell lines, including melanoma.

Purpose of the Study:

• To investigate the cytotoxic and apoptotic effects of Sulforaphane (SF) on melanoma cell lines and fresh melanoma cultivates.
• To elucidate the signaling pathways modulated by SF in melanoma, including oxidative stress, DNA damage response, and apoptosis-related proteins.

Main Methods:

• Treatment of melanoma cell lines and fresh melanoma cultivates with Sulforaphane (SF).
• Assessment of cytotoxicity and apoptosis induction (mitochondrial, caspase-dependent).
• Analysis of signaling pathways, including oxidative stress markers, DNA-damage response, p38 kinase activity, Akt activity, and expression of proapoptotic proteins (Bax, Puma).

Main Results:

• SF demonstrated cytotoxicity and induced mitochondrial, caspase-dependent apoptosis in melanoma cell lines, with lower efficiency in fresh cultivates.
• SF triggered oxidative stress, DNA-damage response, altered p38 kinase activity, and increased Bax and Puma expression in melanoma cells.
• In p53-mutant cells, Puma expression was p38-dependent; in fresh cultivates, Akt-mediated suppression of p38 and p53 potentially reduced SF-induced apoptosis.

Conclusions:

• SF inhibits growth and induces mitochondrial apoptosis in both melanoma cell lines and fresh cultivates.
• The proapoptotic effects of SF may be enhanced by combining it with Akt inhibitors, particularly in patient-derived melanoma samples.
• SF warrants further preclinical investigation as a single agent or in combination therapies for melanoma treatment.