Journal
GENES TO CELLS
Volume 21, Issue 6, Pages 648-660Publisher
WILEY-BLACKWELL
DOI: 10.1111/gtc.12373
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Funding
- Progetto 'Campania Research in Experimental Medicine' (CREME), POP, Campania ESE [5/2007]
- AIEEC (Italian Association EEC Syndrome)
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Y-box binding protein 1 (YBX-1 or YB-1) is an oncoprotein that promotes replicative immortality, tumor cell invasion and metastasis. The increase in the abundance of YB-1 in the cell or YB-1 translocation from the cytoplasm to the nucleus is characteristic of malignant cell growth. We have previously reported that Delta Np63 alpha, a transcription factor that is known to play a pivotal role in keratinocyte proliferation and differentiation, promotes YB-1 nuclear accumulation. Here, we show that YB-1 is highly expressed in proliferating keratinocytes and is down-regulated during keratinocyte differentiation. Delta Np63 alpha reduces YB-1 protein turnover and leads to accumulation of ubiquitin-conjugated YB-1 into the nucleus. Reduction of YB-1 protein level, following treatment with a DNA-damaging agent, is inhibited by DNp63a suggesting that YB-1 and Delta Np63 alpha interplay can support keratinocyte proliferation and protect cells from apoptosis under genotoxic stress.
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