Abstract The photocytotoxicity of water-dispersed 100–300 nm fullerene amino acid derivatives nanoparticles was studied. The nanoparticle solution of fullerene derivatives, l-phenylalanine (C60-phe) and glycine (C60-gly), suppressed the in vitro growth of MCF-7 cells lines, induced cancer cells apoptosis, and caused a perturbation of the cell cycle. These nanoparticle solutions increased intracellular reactive oxygen species after irradiation. C60-phe or C60-gly upregulated the expression of phosphorylated (p)p38 mitogen-activated protein kinase (MAPK). N-Acetyl-l-cysteine significantly depressed the composite-induced activation of p38MAPK, and the kinase inhibitor SB203580 significantly prevented C60 derivative-induced cell apoptosis. This study revealed that p38MAPK is activated by C60 nanoparticles through triggering reactive oxygen species generation, leading to cancer cell injuries.
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