Research press release


Nature Cell Biology

How EGFR promotes skin cancer



    Notch1遺伝子の発現とその活性は、角化細胞に由来するがん細胞系列と腫瘍では大幅に低くなっている。G P Dottoたちは、Notchタンパク質のシグナル伝達を活性化する可能性のある小型分子を探し、ヒト角化細胞と皮膚がんではEGFRがNotch1遺伝子発現の主要な負の調節因子であることを見いだした。EGFR依存性皮膚がんのマウスモデルでこの機構について調べたところ、EGFRが腫瘍抑制遺伝子p53の働きの阻害により、Notch1の発現を妨げているとわかった。


Scientists have pinpointed the molecular mechanisms underlying tumour response to EGFR ? a protein that boosts the development of skin cancer, and an important target for cancer therapy.

Epidermal growth factor receptors (EGFR) stimulate skin cells called keratinocytes to multiply while simultaneously stopping them from becoming more specialized. The overall effect encourages tumours in skin cancer to develop. A paper published online this week in Nature Cell Biology reveals that EGFR wields these functions in skin cancer by preventing expression of Notch1, a gene essential for tumour development.

Notch1 gene expression and activity are significantly lower in keratinocyte cancer cell lines and tumours. When looking for small molecules that may activate Notch protein signalling, G. Paolo Dotto and co-authors found that EGFR is a major negative regulator of Notch1 gene expression in human keratinocytes and skin cancers. By analysing this mechanism in a mouse model of EGFR-dependent skin cancer, they also showed that EGFR stops expression of Notch1 by blocking the tumour suppressor gene p53.

EGFR is an important target of cancer therapy and several selective EGFR inhibitors have now been approved for clinical use. These findings provide further understanding of the molecular mechanisms underlying the tumour response to EGFR inhibition.

doi: 10.1038/ncb1750


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