A PI3K p110β–Rac signalling loop mediates Pten-loss-induced perturbation of haematopoiesis and leukaemogenesis

Haluk Yuzugullu, Lukas Baitsch, Thanh Von, Allison Steiner, Haoxuan Tong, Jing Ni, Linda K. Clayton, Roderick Bronson, Thomas M. Roberts (), Kira Gritsman () and Jean J. Zhao ()
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Haluk Yuzugullu: Dana-Farber Cancer Institute
Lukas Baitsch: Dana-Farber Cancer Institute
Thanh Von: Dana-Farber Cancer Institute
Allison Steiner: Dana-Farber Cancer Institute
Haoxuan Tong: Dana-Farber Cancer Institute
Jing Ni: Dana-Farber Cancer Institute
Linda K. Clayton: Dana-Farber Cancer Institute
Roderick Bronson: Dana-Farber/Harvard Cancer Center Rodent Histopathology Core, Harvard Medical School
Thomas M. Roberts: Dana-Farber Cancer Institute
Kira Gritsman: Dana-Farber Cancer Institute
Jean J. Zhao: Dana-Farber Cancer Institute

Nature Communications, 2015, vol. 6, issue 1, 1-13

Abstract: Abstract The tumour suppressor PTEN, which antagonizes PI3K signalling, is frequently inactivated in haematologic malignancies. In mice, deletion of PTEN in haematopoietic stem cells (HSCs) causes perturbed haematopoiesis, myeloproliferative neoplasia (MPN) and leukaemia. Although the roles of the PI3K isoforms have been studied in PTEN-deficient tumours, their individual roles in PTEN-deficient HSCs are unknown. Here we show that when we delete PTEN in HSCs using the Mx1–Cre system, p110β ablation prevents MPN, improves HSC function and suppresses leukaemia initiation. Pharmacologic inhibition of p110β in PTEN-deficient mice recapitulates these genetic findings, but suggests involvement of both Akt-dependent and -independent pathways. Further investigation reveals that a p110β–Rac signalling loop plays a critical role in PTEN-deficient HSCs. Together, these data suggest that myeloid neoplasia driven by PTEN loss is dependent on p110β via p110β–Rac-positive-feedback loop, and that disruption of this loop may offer a new and effective therapeutic strategy for PTEN-deficient leukaemia.

Date: 2015
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DOI: 10.1038/ncomms9501

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