TY - JOUR
T1 - Signal transducer and activator of transcription (STAT)5 activation by BCR/ABL is dependent on intact Src homology (SH)3 and SH2 domains of BCR/ABL and is required for leukemogenesis
AU - Nieborowska-Skorska, Malgorzata
AU - Wasik, Mariusz A.
AU - Slupianek, Artur
AU - Salomoni, Paolo
AU - Kitamura, Toshio
AU - Calabretta, Bruno
AU - Skorski, Tomasz
PY - 1999/4/19
Y1 - 1999/4/19
N2 - Signal transducer and activator of transcription (STAT)5 is constitutively activated in BCR/ABL-expressing cells, but the mechanisms and functional consequences of such activation are unknown. We show here that BCR/ABL induces phosphorylation and activation of STAT5 by a mechanism that requires the BCR/ABL Src homology (SH)2 domain and the proline-rich binding site of the SH3 domain. Upon expression in 32Dcl3 growth factor-dependent myeloid precursor cells, STAT5 activation-deficient BCR/ABL SH3+SH2 domain mutants functioned as tyrosine kinase and activated Ras, but failed to protect from apoptosis induced by withdrawal of interleukin 3 and/or serum and did not induce leukemia in severe combined immunodeficiency mice. In complementation assays, expression of a dominant-active STAT5B mutant (STAT5B-DAM), but not wild-type STAT5B (STAT5B-WT), in 32Dcl3 cells transfected with STAT5 activation-deficient BCR/ABL SH3+SH2 mutants restored protection from apoptosis, stimulated growth factor-independent cell cycle progression, and rescued the leukemogenic potential in mice. Moreover, expression of a dominant-negative STAT5B mutant (STAT5B-DNM) in 32Dcl3 cells transfected with wild-type BCR/ABL inhibited apoptosis resistance, growth factor-independent proliferation, and the leukemogenic potential of these cells. In retrovirally infected mouse bone marrow cells, expression of STAT5B-DNM inhibited BCR/ABL-dependent transformation. Moreover, STAT5B-DAM, but not STAT5B-WT, markedly enhanced the ability of STAT5 activation- defective BCR/ABL SH3+SH2 mutants to induce growth factor-independent colony formation of primary mouse bone marrow progenitor cells. However, STAT5B-DAM did not rescue the growth factor-independent colony formation of kinase- deficient K1172R BCR/ABL or the triple mutant Y177F+R522L+Y793F BCR/ABL, both of which also fail to activate STAT5. Together, these data demonstrate that STAT5 activation by BCR./ABL is dependent on signaling from more than one domain and document the important role of STAT5-regulated pathways in BCR/ABL leukemogenesis.
AB - Signal transducer and activator of transcription (STAT)5 is constitutively activated in BCR/ABL-expressing cells, but the mechanisms and functional consequences of such activation are unknown. We show here that BCR/ABL induces phosphorylation and activation of STAT5 by a mechanism that requires the BCR/ABL Src homology (SH)2 domain and the proline-rich binding site of the SH3 domain. Upon expression in 32Dcl3 growth factor-dependent myeloid precursor cells, STAT5 activation-deficient BCR/ABL SH3+SH2 domain mutants functioned as tyrosine kinase and activated Ras, but failed to protect from apoptosis induced by withdrawal of interleukin 3 and/or serum and did not induce leukemia in severe combined immunodeficiency mice. In complementation assays, expression of a dominant-active STAT5B mutant (STAT5B-DAM), but not wild-type STAT5B (STAT5B-WT), in 32Dcl3 cells transfected with STAT5 activation-deficient BCR/ABL SH3+SH2 mutants restored protection from apoptosis, stimulated growth factor-independent cell cycle progression, and rescued the leukemogenic potential in mice. Moreover, expression of a dominant-negative STAT5B mutant (STAT5B-DNM) in 32Dcl3 cells transfected with wild-type BCR/ABL inhibited apoptosis resistance, growth factor-independent proliferation, and the leukemogenic potential of these cells. In retrovirally infected mouse bone marrow cells, expression of STAT5B-DNM inhibited BCR/ABL-dependent transformation. Moreover, STAT5B-DAM, but not STAT5B-WT, markedly enhanced the ability of STAT5 activation- defective BCR/ABL SH3+SH2 mutants to induce growth factor-independent colony formation of primary mouse bone marrow progenitor cells. However, STAT5B-DAM did not rescue the growth factor-independent colony formation of kinase- deficient K1172R BCR/ABL or the triple mutant Y177F+R522L+Y793F BCR/ABL, both of which also fail to activate STAT5. Together, these data demonstrate that STAT5 activation by BCR./ABL is dependent on signaling from more than one domain and document the important role of STAT5-regulated pathways in BCR/ABL leukemogenesis.
KW - Animals
KW - Apoptosis
KW - Bone Marrow Cells/metabolism
KW - Cell Cycle/genetics
KW - DNA Replication/genetics
KW - DNA-Binding Proteins/genetics
KW - Genes, abl/genetics
KW - Genes, ras/genetics
KW - Leukemia/genetics
KW - Mice
KW - Mice, SCID
KW - Milk Proteins
KW - Mutation
KW - Phosphoproteins/analysis
KW - Phosphorylation
KW - STAT5 Transcription Factor
KW - Signal Transduction/genetics
KW - Stem Cells/metabolism
KW - Trans-Activators/genetics
KW - Transcriptional Activation/genetics
KW - src Homology Domains/genetics
UR - http://www.scopus.com/inward/record.url?scp=0033583530&partnerID=8YFLogxK
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=purepublist2023&SrcAuth=WosAPI&KeyUT=WOS:000079898600006&DestLinkType=FullRecord&DestApp=WOS
U2 - 10.1084/jem.189.8.1229
DO - 10.1084/jem.189.8.1229
M3 - Article
C2 - 10209040
SN - 0022-1007
VL - 189
SP - 1229
EP - 1242
JO - Journal of Experimental Medicine
JF - Journal of Experimental Medicine
IS - 8
ER -