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- Title
Constitutively active STAT5 variants induce growth and survival of hematopoietic cells through a PI 3-kinase/Akt dependent pathway.
- Authors
Santos, S C; Lacronique, V; Bouchaert, I; Monni, R; Bernard, O; Gisselbrecht, S; Gouilleux, F
- Abstract
Signal Transducer and Activator of Transcription (STATs) are important mediators of cytokine and growth factor-induced signal transduction. STAT5A and STAT5B have been shown to play a role in survival and proliferation of hematopoietic cells both in vitro and in vivo and to contribute to the growth and viability of cells transformed by the TEL-JAK2 oncoprotein. In this study, we investigated the molecular mechanisms by which constitutively active STAT5 proteins induce cell proliferation and survival of Ba/F3 cell lines expressing either dominant positive STAT5A or STAT5B variants or TEL-JAK2 or TEL-ABL fusion proteins. Our results showed that active STAT5 constitutively interacted with p85, the regulatory subunit of the PI 3-kinase. A constitutive activity of the PI 3-kinase/Akt pathway was observed in these cells and required for their cell cycle progression. In contrast, while activity of the PI 3-kinase/Akt pathway was required for survival of Ba/F3 cells expressing the constitutively active forms of STAT5A or STAT5B, it was dispensable for cells transformed by TEL-JAK2 or TEL-ABL fusion proteins, suggesting that additional survival pathways take place in these transformed cells.
- Publication
Oncogene, 2001, Vol 20, Issue 17, p2080
- ISSN
0950-9232
- Publication type
Journal Article
- DOI
10.1038/sj.onc.1204308