Sonic Hedgehog Opposes Epithelial Cell Cycle Arrest

Stratified epithelium displays an equilibrium between proliferation and cell cycle arrest, a balance that is disrupted in basal cell carcinoma (BCC). Sonic hedgehog (Shh) pathway activation appears sufficient to induce BCC, however, the way it does so is unknown. Shh-induced epidermal hyperplasia is...

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Detalles Bibliográficos
Autores principales: Fan, Hongran, Khavari, Paul A.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1999
Materias:
Original Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2164980/
https://www.ncbi.nlm.nih.gov/pubmed/10508856
Descripción
Sumario:Stratified epithelium displays an equilibrium between proliferation and cell cycle arrest, a balance that is disrupted in basal cell carcinoma (BCC). Sonic hedgehog (Shh) pathway activation appears sufficient to induce BCC, however, the way it does so is unknown. Shh-induced epidermal hyperplasia is accompanied by continued cell proliferation in normally growth arrested suprabasal cells in vivo. Shh-expressing cells fail to exit S and G2/M phases in response to calcium-induced differentiation and also resist exhaustion of replicative growth capacity. In addition, Shh blocks p21(CIP1/WAF1)-induced growth arrest. These data indicate that Shh promotes neoplasia by opposing normal stimuli for epithelial cell cycle arrest.

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