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Ptch1 overexpression drives skin carcinogenesis and developmental defects in K14Ptch FVB mice

  • Author(s): Kang, HC
  • Wakabayashi, Y
  • Jen, KY
  • Mao, JH
  • Zoumpourlis, V
  • Del Rosario, R
  • Balmain, A
  • et al.
Abstract

Ptch1 is a key regulator of embryonic development, acting through the sonic hedgehog (SHH) signaling pathway. Ptch1 is best known as a tumor suppressor, as germline or somatic mutations in Ptch1 lead to the formation of skin basal cell carcinomas. Here we show that Ptch1 also acts as a lineage-dependent oncogene, as overexpression of Ptch1 in adult skin in K14Ptch FVB transgenic mice synergizes with chemically induced Hras mutations to promote squamous carcinoma development. These effects were not because of aberrant activation of SHH signaling by the K14Ptch FVB transgene, as developmental defects in the highest expressing transgenic lines were consistent with the inhibition of this pathway. Carcinomas from K14Ptch FVB transgenic mice had only a small number of nonproliferative Ptch1 transgene-positive cells, suggesting that the Ptch1 transgene is not required for tumor maintenance, but may have a critical role in cell-fate determination at the initiation stage. © 2013 The Society for Investigative Dermatology.

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