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Identification of CRKL as the constitutively phosphorylated 39-kD tyrosine
phosphoprotein in chronic myelogenous leukemia cells
GL Nichols, MA Raines, JC Vera, L Lacomis, P Tempst and DW Golde
Division of Hematologic Oncology, Memorial Sloan-Kettering Cancer Center,
New York, NY.
Chronic myelogenous leukemia (CML) is characterized by the presence of the
Philadelphia (Ph) chromosome in clonally derived hematopoietic precursors
and their progeny. The Ph chromosome arises from a translocation that
deregulates the c-ABL protein tyrosine kinase, giving it transforming
potential and increased kinase activity. We observed a unique 39-kD
tyrosine phosphoprotein (pp39), previously reported in blastic CML cell
lines, in neutrophils from 50 cases of chronic phase CML. This protein was
prominently and constitutively tyrosine-phosphorylated in CML neutrophils
and was not phosphorylated in normal neutrophils. Stimulation of normal
neutrophils with cytokines and agonists did not induce tyrosine
phosphorylation of proteins migrating in the region of pp39, and the
phosphorylation state of pp39 in CML neutrophils was not affected by kinase
inhibitors known to downregulate the ABL kinase. The pp39 was not
phosphorylated in hematopoietic cells from healthy donors or from patients
with Ph chromosome-negative myeloproliferative disorders. Using micro amino
acid sequencing of purified preparations of pp39, we identified pp39 as
CRKL protein, which is consistent with recent immunologic studies in the
blastic K562 cell line. Immunoblotting with anti-CRKL antibodies showed the
presence of CRKL protein in CML cells and cell lines as well as in
antiphosphotyrosine immunoprecipitates from CML cells. Our results suggest
that pp39 CRKL in CML neutrophils may be stably tyrosine-phosphorylated by
the BCR/ABL kinase at an early stage of myeloid differentiation when the
ABL kinase is active. CRK, CRKL, and other SH2 (SRC homology
domain)/SH3-containing proteins function as adaptor molecules in
nonreceptor tyrosine kinase signalling pathways. Although the CRKL protein
is present in normal neutrophils, it is not tyrosine-phosphorylated, and
the inability to induce such phosphorylation in normal neutrophils suggests
a special role of this phosphoprotein in the pathogenesis of CML.
Constitutive phosphorylation of CRKL is unique to CML, indicating that it
may be a useful target for therapeutic intervention.
Volume 84,
Issue 9,
pp. 2912-2918,
11/01/1994
Copyright © 1994 by The American Society of Hematology

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Y Shi, K Alin, and S P Goff
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M. Sattler, S. Verma, Y. B. Pride, R. Salgia, L. R. Rohrschneider, and J. D. Griffin
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