Temporal changes in PTEN and mTORC2 regulation of hematopoietic stem cell self-renewal and leukemia suppression

Jeffrey A. Magee, Tsuneo Ikenoue, Daisuke Nakada, Jae Y. Lee, Kun Liang Guan, Sean J. Morrison

Research output: Contribution to journalArticle

116 Scopus citations

Abstract

Pten deletion from adult mouse hematopoietic cells activates the PI3-kinase pathway, inducing hematopoietic stem cell (HSC) proliferation, HSC depletion, and leukemogenesis. Pten is also mutated in human leukemias, but rarely in early childhood leukemias. We hypothesized that this reflects developmental changes in PI3-kinase pathway regulation. Here we show that Rictor deletion prevents leukemogenesis and HSC depletion after Pten deletion in adult mice, implicating mTORC2 activation in these processes. However, Rictor deletion had little effect on the function of normal HSCs. Moreover, Pten deletion from neonatal HSCs did not activate the PI3-kinase pathway or promote HSC proliferation, HSC depletion, or leukemogenesis. Pten is therefore required in adult, but not neonatal, HSCs to negatively regulate mTORC2 signaling. This demonstrates that some critical tumor suppressor mechanisms in adult cells are not required by neonatal cells. Developmental changes in key signaling pathways therefore confer temporal changes upon stem cell self-renewal and tumor suppressor mechanisms.

Original languageEnglish (US)
Pages (from-to)415-428
Number of pages14
JournalCell Stem Cell
Volume11
Issue number3
DOIs
StatePublished - Sep 7 2012

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Cell Biology

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