TY - JOUR
T1 - PTEN deficiency is fully penetrant for prostate adenocarcinoma in C57BL/6 mice via mTOR-dependent growth
AU - Blando, Jorge
AU - Portis, Melisa
AU - Benavides, Fernando
AU - Alexander, Angela
AU - Mills, Gordon
AU - Dave, Bhuvanesh
AU - Conti, Claudio J.
AU - Kim, Jeri
AU - Walker, Cheryl Lyn
PY - 2009/5
Y1 - 2009/5
N2 - The tumor suppressor phosphatase and tensin homolog (PTEN) is frequently involved in human prostate carcinoma. PTEN is therefore an attractive target for the development of preclinical animal models. Prostate intraepithelial neoplasia lesions develop in mice with Pten heterozygosity, but disease progression has been reported only in combination with either other tumor suppressor gene alterations or the conditional inactivation of both Pten alleles in prostate epithelial cells. We report that on a C57BL/6 background, in contrast to previous studies on mixed 129 genetic backgrounds, Pten locus heterozygosity is fully penetrant for the development of prostate adenocarcinoma. Grossly observable tumors were detected at 6 months of age, and, by 10 to 12 months, 100% of examined mice developed adenocarcinoma of the anterior prostate. Furthermore, double heterozygotes carrying both Pten and Tsc2-null alleles showed no increase relative to Pten+/- heterozygotes in either lesion development or progression. Lesions in both Pten+/-; Tsc2+/-, and Pten+/- mice exhibited loss of PTEN expression and activation of PI3K signaling. PI3K activation occurred early in prostate intraepithelial neoplasia lesion formation in these animals, consistent with loss of PTEN function, and contributed to the etiology of tumors that developed in Pten+/- mice. Furthermore, prostate lesion growth in Pten+/- mice was dependent on mTOR, as evidenced by a reduction in both phospho-S6 levels and proliferative index after rapamycin treatment.
AB - The tumor suppressor phosphatase and tensin homolog (PTEN) is frequently involved in human prostate carcinoma. PTEN is therefore an attractive target for the development of preclinical animal models. Prostate intraepithelial neoplasia lesions develop in mice with Pten heterozygosity, but disease progression has been reported only in combination with either other tumor suppressor gene alterations or the conditional inactivation of both Pten alleles in prostate epithelial cells. We report that on a C57BL/6 background, in contrast to previous studies on mixed 129 genetic backgrounds, Pten locus heterozygosity is fully penetrant for the development of prostate adenocarcinoma. Grossly observable tumors were detected at 6 months of age, and, by 10 to 12 months, 100% of examined mice developed adenocarcinoma of the anterior prostate. Furthermore, double heterozygotes carrying both Pten and Tsc2-null alleles showed no increase relative to Pten+/- heterozygotes in either lesion development or progression. Lesions in both Pten+/-; Tsc2+/-, and Pten+/- mice exhibited loss of PTEN expression and activation of PI3K signaling. PI3K activation occurred early in prostate intraepithelial neoplasia lesion formation in these animals, consistent with loss of PTEN function, and contributed to the etiology of tumors that developed in Pten+/- mice. Furthermore, prostate lesion growth in Pten+/- mice was dependent on mTOR, as evidenced by a reduction in both phospho-S6 levels and proliferative index after rapamycin treatment.
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U2 - 10.2353/ajpath.2009.080055
DO - 10.2353/ajpath.2009.080055
M3 - Article
C2 - 19395652
AN - SCOPUS:65649118955
SN - 0002-9440
VL - 174
SP - 1869
EP - 1879
JO - American Journal of Pathology
JF - American Journal of Pathology
IS - 5
ER -