PD166326, a novel tyrosine kinase inhibitor, has greater antileukemic activity than imatinib mesylate in a murine model of chronic myeloid leukemia Journal Article

   

Authors:	Wolff, N. C.; Veach, D. R.; Tong, W. P.; Bornmann, W. G.; Clarkson, B.; Ilaria, R. L.
Article Title:	PD166326, a novel tyrosine kinase inhibitor, has greater antileukemic activity than imatinib mesylate in a murine model of chronic myeloid leukemia
Abstract:	Imatinib mesylate is highly effective in newly diagnosed chronic myeloid leukemia (CML), but BCR/ABL (breakpoint cluster region/abelson murine leukemia)positive progenitors persist in most patients with CML treated with imatinib mesylate, indicating the need for novel therapeutic approaches. In this study, we have used the murine CML-like myeloproliferative disorder as a platform to characterize the pharmacokinetic, signal transduction, and antileukemic properties of PD166326, one of the most potent members of the pyridopyrimidine class of protein tyrosine kinase inhibitors. In mice with the CML-like disease, PD166326 rapidly inhibited Bcr/Abl kinase activity after a single oral dose and demonstrated marked antileukemic activity in vivo. Seventy percent of PD166326-treated mice achieved a white blood cell (WBC) count less than 20.0 x 10(9)/L (20 000/mu L) at necropsy, compared with only 8% of imatinib mesylate-treated animals. Further, two thirds of PD166326-treated animals had complete resolution of splenomegaly, compared with none of the imatinib mesylate-treated animals. Consistent with its more potent antileukemic effect in vivo, PD166326 was also superior to imatinib mesylate in inhibiting the constitutive tyrosine phosphorylation of numerous leukemia-cell proteins, including the src family member Lyn. PD166326 also prolonged the survival of mice with imatinib mesylate-resistant CML induced by the Bcr/Abl mutants P210/H396P and P210/M351T. Altogether, these findings demonstrate the potential of more potent Bcr/Abl inhibitors to provide more effective antileukemic activity. Clinical development of PD166326 or a related analog may lead to more effective drugs for the treatment of de novo and imatinib mesylate-resistant CML. (c) 2005 by The American Society of Hematology.
Keywords:	leukemia; cytogenetic; chronic myelogenous leukemia; acute lymphoblastic-leukemia; responses; blast crisis; c-abl; chronic-phase; philadelphia-chromosome; src-family kinase; chromosome-positive; bcr-abl independence
Journal Title:	Blood
Volume:	105
Issue:	10
ISSN:	0006-4971
Publisher:	American Society of Hematology
Date Published:	2005-05-15
Start Page:	3995
End Page:	4003
Language:	English
DOI:	10.1182/blood-2004-09-3534
ACCESSION:	WOS:000229009000044
PROVIDER:	wos
PMCID:	PMC1895078
PUBMED:	15657179
Notes:	--- - Article - "Source: Wos"

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