Abstract
Akt activation is common in progressive thyroid cancer. In breast cancer, Akt1 induces primary cancer growth, but is reported to inhibit metastasis in vivo in several model systems. In contrast, clinical and in vitro studies suggest a metastasis-promoting role for Akt1 in thyroid cancer. The goal of this study was to determine the functional role of Akt1 in thyroid cancer growth and metastatic progression in vivo using thyroid hormone receptor (TR) βPV/PV knock-in (PV) mice, which develop metastatic thyroid cancer. We crossed Akt1−/− and PV mice and compared tumor development, local progression, metastasis and histology in TRβPV/PV/Akt1+/+ (PVPV-Akt1WT) and TRβPV/PV/Akt1−/− (PVPV-Akt1KO) mice. Mice were killed at 3, 6, 9, 12 and 15 months; necropsy was performed and serum thyroid stimulating hormone (TSH) was measured. Thyroid hyperplasia occurred in both groups beginning at 3 months; the thyroid size was greater in the PVPV-Akt1WT mice (P<0.001). In comparison with PVPV-Akt1WT mice, thyroid cancer development was delayed in the PVPV-Akt1KO mice (P=0.003) and the degree of tumor invasiveness was reduced. The PVPV-Akt1WT mice displayed pulmonary metastases at 12 and 15 months of age, by contrast PVPV-Akt1KO mice did not develop distant metastases at 15 months of age. Despite continued expression of Akt2 or Akt3, pAkt levels were decreased and there was evidence of reduced Akt effect on p27 in the PVPV-Akt1KO thyroids. TSH levels were similarly elevated in PV mice regardless of Akt1 expression. In conclusion, thyroid cancer development and progression in TR βPV/PV mice are Akt1-dependent, consistent with a tumor progression-promoting role in this murine thyroid cancer model.
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Acknowledgements
Funding for the work is from NIH grants (P01CA124570 and R01CA102572) to MDR. We appreciate the technical assistance of Michael Ostrowski, John Thompson and Jun Liu.
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Dr Ringel has received honoraria for advisory boards from Veracyte and Astra Zeneca. This was not related to the work presented in the manuscript. He has received funding from NIH for this work. M Saji, K Narahara, S McCarty, V Vasko, K La Perle, K Porter, D Jarjoura, C Lu and S-Y Cheng all declare no conflicts of interest.
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Saji, M., Narahara, K., McCarty, S. et al. Akt1 deficiency delays tumor progression, vascular invasion, and distant metastasis in a murine model of thyroid cancer. Oncogene 30, 4307–4315 (2011). https://doi.org/10.1038/onc.2011.136
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DOI: https://doi.org/10.1038/onc.2011.136
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