Induction of apoptosis in colorectal carcinoma cells treated with 4-hydroxy-2-nonenal and structurally related aldehydic products of lipid peroxidation.

West JD, Ji C, Duncan ST, Amarnath V, Schneider C, Rizzo CJ, Brash AR, Marnett LJ
Chem Res Toxicol. 2004 17 (4): 453-62

PMID: 15089087 · DOI:10.1021/tx034248o

The oxidation of polyunsaturated fatty acids during oxidative stress gives rise to a series of toxic alpha,beta-unsaturated aldehydes, including the electrophile 4-hydroxy-2-nonenal (4-HNE) and the related aldehydes, 4-hydroperoxy-2-nonenal (4-HPNE) and 4-oxo-2-nonenal (4-ONE). We synthesized these compounds, as well as the resolved enantiomers of 4-HNE, and compared their toxicities and apoptotic responses in the human colorectal cancer cell line RKO. All of these molecules execute similar death responses at comparable doses over almost identical time frames in RKO cells. The apoptotic response induced by 4-HPNE, 4-ONE, and 4-HNE enantiomers involves activation of caspases, proteolysis of downstream caspase targets, and nucleosomal DNA fragmentation. The results presented herein suggest that these molecules commonly activate certain signaling pathways that control cell death irrespective of their reactive properties.

MeSH Terms (9)

Aldehydes Apoptosis Carcinoma Colorectal Neoplasms DNA Damage Humans Lipid Peroxidation Proteins Tumor Cells, Cultured

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