Strain-specific spontaneous and NNK-mediated tumorigenesis in Pten+/- mice

Mary Christine Hollander, Andria R. Balogh, Jaminelli Liwanag, Wei Han, Ritva Ilona Linnoila, Miriam R. Anver, Phillip A. Dennis

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Pten is a negative regulator of the Akt pathway, and its inactivation is believed to be an etiological factor in many tumor types. Pten+/- mice are susceptible to a variety of spontaneous tumor types, depending on strain background. Pten+/- mice, in lung tumor-sensitive and -resistant background strains, were treated with a tobacco carcinogen, 4-(methylnitrosamino)-1-(3- pyridyl)-1-butanone (NNK), to determine whether allelic Pten deletion can cooperate with NNK in carcinogenesis in lung or other tissues. In lung tumor-resistant C57BL/6 Pten+/- or +/+ mice, NNK treatment did not lead to any lung tumors and did not increase the incidence or severity of tumors previously reported for this strain. In contrast, in a lung tumor-susceptible pseudo-A/J strain, there was a dose-dependent increase in lung tumor size in Pten+/- compared with +/+ mice, although there was no increase in multiplicity. No other tumor types were observed in pseudo-A/J Pten+/- mice regardless of NNK treatment. Lung tumors from these Pten+/- mice had K-ras mutations, retained Pten expression and had similar Akt pathway activation as lung tumors from +/+ mice. Therefore, deletion of a single copy of Pten does not substantially add to the lung tumor phenotype conferred by mutation of K-ras by NNK, and there is likely no selective advantage for loss of the second Pten allele in lung tumor initiation.

Original languageEnglish (US)
Pages (from-to)866-872
Number of pages7
Issue number8
StatePublished - Aug 2008
Externally publishedYes

ASJC Scopus subject areas

  • Cancer Research


Dive into the research topics of 'Strain-specific spontaneous and NNK-mediated tumorigenesis in Pten+/- mice'. Together they form a unique fingerprint.

Cite this