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The effect Akt2 deletion on tumor development in Pten(+/-) mice

P-Z Xu1, M-L Chen, S-M Jeon

  • 1Department of Biochemistry and Molecular Genetics, College of Medicine, University of Illinois at Chicago, Chicago, IL 60607, USA.

Oncogene
|July 12, 2011
PubMed

Insights

Akt2 deficiency minimally impacts tumor development in Pten(+/-) mice, unlike Akt1. This suggests Akt1 plays a more critical role in inhibiting tumorigenesis across most tissues, with Akt2 showing specific effects in thyroid tumors.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • The serine/threonine kinase Akt is a key regulator of cell survival and proliferation, frequently hyperactivated in human cancers.
  • Akt isoforms (Akt1, Akt2, Akt3) have distinct roles, but their specific contributions to tumorigenesis and the impact of their deficiencies remain incompletely understood.
  • Previous studies demonstrated Akt1 deficiency significantly reduces tumor incidence in Pten(+/-) mice, inhibiting endometrial and prostate cancers.

Purpose of the Study:

  • To investigate the specific role of Akt2 deficiency in tumorigenesis within the Pten(+/-) mouse model.
  • To compare the effects of Akt1 versus Akt2 deficiency on tumor incidence across various tissues.
  • To elucidate the mechanisms underlying the differential impact of Akt isoforms on cancer development.

Main Methods:

  • Analysis of tumor incidence in Pten(+/-) mice with targeted Akt2 deficiency.
  • Comparison of tumor development between Pten(+/-)Akt1(-/-) and Pten(+/-)Akt2(-/-) mouse models.
  • Assessment of Akt isoform expression levels and blood insulin levels in the studied mouse models.

Main Results:

  • Akt2 deficiency had minimal impact on prostate neoplasia, endometrial carcinoma, intestinal polyps, and adrenal lesions in Pten(+/-) mice.
  • A significant decrease in thyroid tumor incidence was observed in Pten(+/-)Akt2(-/-) mice, correlating with high Akt2 expression in the thyroid.
  • Unlike Akt1 deficiency, Akt2 deficiency did not markedly inhibit overall tumorigenesis in Pten(+/-) mice, potentially due to insufficient reduction in total Akt activity.

Conclusions:

  • Akt1 plays a more critical role than Akt2 in suppressing tumorigenesis across most tissues in the Pten(+/-) model.
  • Akt2 deficiency specifically inhibits thyroid tumor development in Pten(+/-) mice, highlighting tissue-specific isoform functions.
  • Elevated insulin levels in Pten(+/-)Akt2(-/-) mice may compensate for Akt2 loss by increasing Akt1/Akt3 activity, thus limiting the therapeutic potential of targeting Akt2 alone.

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