A new mechanism of resistance to ABL1 tyrosine kinase inhibitors in a BCR-ABL1-positive cell line.
Leuk Res
; 61: 44-52, 2017 10.
Article
em En
| MEDLINE
| ID: mdl-28888102
ABSTRACT
Tyrosine kinase inhibitors (TKI) constitute the frontline treatment for chronic myeloid leukemia patients. Dasatinib, a second-generation TKI, was developed to overcome TKI resistances. However, dasatinib resistances are also described but remain less characterized. To mimic in vivo acquired dasatinib resistance, the BCR-ABL1-positive cell line K562 was transiently treated with a pharmacological concentration of dasatinib, for a short time in the presence of stem cell factor. A dasatinib resistant counterpart (K562 RES) was developed. Investigation of resistance mechanisms using kinase substrate arrays revealed that FYN was overactivated in K562 RES. The FYN inhibitor KX2-391 cooperated with dasatinib to block K562 RES proliferation. Cell tracking experiments showed that activated FYN support cell proliferation independently of BCR-ABL1 in K562 RES cells. Moreover, the MEK-ERK pathway was found hyper-phosphorylated in K562 RES cells even in the presence of dasatinib. Actually, ERK1/2 activity supported viability in K562 RES only in the absence of BCR-ABL1 activity. Finally, BCR-ABL1 and MEK inhibitor combination was sufficient to induce cell death even in non-proliferating resistant cells. Considering the conditions used to generate this dasatinib resistant cell line, such a resistance mechanism could be found in dasatinib treated patients. Consequently, it is valuable to know that inhibition of the MEK-ERK1/2 axis can overcome this resistance.
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MEDLINE
Assunto principal:
Leucemia Mielogênica Crônica BCR-ABL Positiva
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Resistencia a Medicamentos Antineoplásicos
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Dasatinibe
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Antineoplásicos
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article