FOXO3 encodes a carcinogen-activated transcription factor frequently deleted in early-stage lung adenocarcinoma.

Cancer Research
Oliver R MikseChristopher R Herzog

Abstract

The FOXO family of transcription factors elicits cell cycle arrest, apoptosis, and resistance to various physiologic and pathologic stresses relevant to sporadic cancer, such as DNA damage and oxidative stress. Although implicated as tumor suppressors, FOXO genetic inactivation has not been observed in human cancer. In an investigation of the two major types of non-small cell lung cancer, here, we identify the FOXO3 gene as a novel target of deletion in human lung adenocarcinoma (LAC). Biallelic or homozygous deletion (HD) of FOXO3 was detected in 8 of 33 (24.2%) mostly early-stage LAC of smokers. Another 60.6% of these tumors had losses of FOXO3 not reaching the level of HD (hereafter referred to as sub-HD). In contrast, no HD of FOXO3 was observed in 19 lung squamous cell carcinoma. Consistent with the deletion of FOXO3 were corresponding decreases in its mRNA and protein levels in LAC. The potential role of FOXO3 loss in LAC was also investigated. The carcinogen (+)-anti-7,8-dihydroxy-9,10-epoxy-7,8,9,10-tetrahydrobenzo[a]pyrene (BPDE) is strongly implicated as a cause of human lung cancer. Here, we show that FOXO3a is functionally activated and augments the level of caspase-dependent apoptosis in cells exposed to this DNA-d...Continue Reading

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