Erlotinib effectively inhibits JAK2V617F activity and polycythemia vera cell growth.
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Li Z, Xu M, Xing S, Ho WT, Ishii T, Li Q, Fu X, Zhao ZJ
Erlotinib effectively inhibits JAK2V617F activity and polycythemia vera cell growth.
J Biol Chem. 2007 Feb 9;282(6):3428-32. Epub 2006 Dec 18.
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- 17178722 [ View in PubMed]
- Abstract
JAK2(V617F), a mutant of tyrosine kinase JAK2, is found in most patients with polycythemia vera (PV) and a substantial proportion of patients with idiopathic myelofibrosis or essential thrombocythemia. The JAK2 mutant displays a much increased kinase activity and generates a PV-like phenotype in mouse bone marrow transplant models. This study shows that the anti-cancer drug erlotinib (Tarceva) is a potent inhibitor of JAK2(V617F) activity. In vitro colony culture assays revealed that erlotinib at micro-molar concentrations effectively suppresses the growth and expansion of PV hematopoietic progenitor cells while having little effect on normal cells. Furthermore, JAK2(V617F)-positive cells from PV patients show greater susceptibility to the inhibitor than their negative counterparts. Similar inhibitory effects were found with the JAK2(V617F)-positive human erythroleukemia HEL cell line. These data suggest that erlotinib may be used for treatment of JAK2(V617F)-positive PV and other myeloproliferative disorders.
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