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Current Drug Targets

Editor-in-Chief

ISSN (Print): 1389-4501
ISSN (Online): 1873-5592

Tyrosine Kinases as Therapeutic Targets in BCR-ABL Negative Chronic Myeloproliferative Disorders

Author(s): Andreas Reiter, Christoph Walz and Nicholas C. P. Cross

Volume 8, Issue 2, 2007

Page: [205 - 216] Pages: 12

DOI: 10.2174/138945007779940124

Price: $65

Abstract

Acquired constitutive activation of protein tyrosine kinases is a central feature in the pathogenesis of chronic myeloproliferative disorders (CMPDs). The most commonly involved genes are the receptor tyrosine kinases PDGFRA, PDGFRB, FGFR1 or c-KIT and the non-receptor tyrosine kinases JAK2 and ABL. Activation occurs as a consequence of specific point mutations or fusion genes generated by chromosomal translocations, insertions or deletions. Mutant kinases are constitutively active in the absence of the natural ligands resulting in deregulation of haemopoiesis in a manner analogous to BCR-ABL in chronic myeloid leukaemia. With the advent of targeted signal transduction therapy with tyrosine kinase inhibitors, an accurate diagnosis of CMPDs by morphology, karyotyping and molecular genetics has become increasingly important. Imatinib induces high response rates in patients associated with constitutive activation of ABL, PDGFRα , PDGFRβ and some KIT mutants. Other inhibitors under development are promising candidates for effective treatment of patients with constitutive activation of JAK2, FGFR1 and imatinib-resistant KIT mutants.

Keywords: Tyrosine kinase, myeloproliferative disorders, PDGFRA, PDGFRB, FGFR1, JAK2, c-KIT


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