Regulation mechanism in keratinocyte growth and differentiation by p53 homologue p51/p63 and Maf

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p51/p63, a homologue of p53 tumor suppressor, is well known to play a role in oncogenesis. Simultaneously, p51/p63 promotes development of cellular characters specific for squamous cells, such as keratinocytes. Contrast to p51/p63, TGFβ suppresses these cellular characters as squamous cells, which leads to induction of cellular functions specific for mesenchymal cells. We focused on desmoplakin, calcium-dependent homophilic adhesion molecule, because the desmoplakin is a unique molecule in squamous cells. We found that desmoplakin expression is increased by p51/p63 whereas it is decreased by TGFβ.