Strain-Specific Spontaneous and NNK-Mediated Tumorigenesis in Pten+/− Mice
| Autor: | Mary Christine Hollander, Andria R. Balogh, Jaminelli Liwanag, Wei Han, Ritva Ilona Linnoila, Miriam R. Anver, Phillip A. Dennis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Neoplasia: An International Journal for Oncology Research, Vol 10, Iss 8, Pp 866-872 (2008) |
| Druh dokumentu: | article |
| ISSN: | 1476-5586 1522-8002 |
| DOI: | 10.1593/neo.08406 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|