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SH2-containing Inositol 5'-phosphatase Inhibits Transformation of Abelson Murine Leukemia Virus

Overview
Journal J Virol
Date 2011 Jun 24
PMID 21697469
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Abstract

v-Abl protein tyrosine kinase encoded by Abelson murine leukemia virus (Ab-MLV) transforms pre-B cells. Transformation requires the phosphatidylinositol 3-kinase (PI3K) pathway. This pathway is antagonized by SH2-containing inositol 5'-phosphatase (SHIP), raising the possibility that v-Abl modulates PI3K signaling through SHIP. Consistent with this, we show that v-Abl expression reduces levels of full-length p145 SHIP in a v-Abl kinase activity-dependent fashion. This event requires signals from the Abl SH2 domain but not the carboxyl terminus. Forced expression of full-length SHIP significantly reduces Ab-MLV pre-B-cell transformation. Therefore, reduction of SHIP protein by v-Abl is a critical component in Ab-MLV transformation.

References
1.
Helgason C, Damen J, Rosten P, Grewal R, Sorensen P, Chappel S . Targeted disruption of SHIP leads to hemopoietic perturbations, lung pathology, and a shortened life span. Genes Dev. 1998; 12(11):1610-20. PMC: 316868. DOI: 10.1101/gad.12.11.1610. View

2.
Kharas M, Deane J, Wong S, OBosky K, Rosenberg N, Witte O . Phosphoinositide 3-kinase signaling is essential for ABL oncogene-mediated transformation of B-lineage cells. Blood. 2004; 103(11):4268-75. DOI: 10.1182/blood-2003-07-2193. View

3.
Ruschmann J, Ho V, Antignano F, Kuroda E, Lam V, Ibaraki M . Tyrosine phosphorylation of SHIP promotes its proteasomal degradation. Exp Hematol. 2010; 38(5):392-402, 402.e1. DOI: 10.1016/j.exphem.2010.03.010. View

4.
Geier S, Algate P, Carlberg K, Flowers D, Friedman C, Trask B . The human SHIP gene is differentially expressed in cell lineages of the bone marrow and blood. Blood. 1997; 89(6):1876-85. View

5.
Horn S, Endl E, Fehse B, Weck M, Mayr G, Jucker M . Restoration of SHIP activity in a human leukemia cell line downregulates constitutively activated phosphatidylinositol 3-kinase/Akt/GSK-3beta signaling and leads to an increased transit time through the G1 phase of the cell cycle. Leukemia. 2004; 18(11):1839-49. DOI: 10.1038/sj.leu.2403529. View