Conditional loss of PTEN leads to precocious development and neoplasia in the mammary gland

Gang Li, Gertraud W. Robinson, Ralf Lesche, Hilda Martinez-Diaz, Zhaorong Jiang, Nora Rozengurt, Kay Uwe Wagner, De Chang Wu, Timothy F. Lane, Xin Liu, Lothar Hennighausen, Hong Wu

Research output: Contribution to journalArticlepeer-review

224 Scopus citations


PTEN tumor suppressor is frequently mutated in human cancers, including breast cancers. Female patients with inherited PTEN mutations suffer from virginal hypertrophy of the breast with high risk of malignant transformation. However, the exact mechanisms of PTEN in controlling mammary gland development and tumorigenesis are unclear. In this study, we generated mice with a mammary-specific deletion of the Pten gene. Mutant mammary tissue displayed precocious lobulo-alveolar development, excessive ductal branching, delayed involution and severely reduced apoptosis. Pten null mammary epithelial cells were disregulated and hyperproliferative. Mutant females developed mammary tumors early in life. Similar phenotypes were observed in Pten-null mammary epithelia that had been transplanted into wild-type stroma, suggesting that PTEN plays an essential and cell-autonomous role in controlling the proliferation, differentiation and apoptosis of mammary epithelial cell.

Original languageEnglish (US)
Pages (from-to)4159-4170
Number of pages12
Issue number17
StatePublished - Sep 2002


  • Apoptosis
  • Cowden's disease
  • Ductal growth
  • Mammary development
  • PTEN

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology


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