TY - JOUR
AU - Gouilleux, Fabrice
AB - 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.
TI - Constitutively active STAT5 variants induce growth and survival of hematopoietic cells through a PI 3-kinase/Akt dependent pathway
JF - Oncogene
DO - 10.1038/sj.onc.1204308
DA - 2001-04-20
UR - https://www.deepdyve.com/lp/springer-journals/constitutively-active-stat5-variants-induce-growth-and-survival-of-b45YtJnX3r
SP - 2080
EP - 2090
VL - 20
IS - 17
DP - DeepDyve
ER -