2010
Dasatinib Promotes BIM Dependent Apoptosis Via MEK/ERK without Need for Permanent BCR-ABL Inhibition
ŠIMARA, Pavel, Stanislav STEJSKAL, Martina PETERKOVÁ, Irena KRONTORÁD KOUTNÁ, Zdeněk RÁČIL et. al.Základní údaje
Originální název
Dasatinib Promotes BIM Dependent Apoptosis Via MEK/ERK without Need for Permanent BCR-ABL Inhibition
Autoři
ŠIMARA, Pavel (203 Česká republika, domácí), Stanislav STEJSKAL (203 Česká republika, domácí), Martina PETERKOVÁ (203 Česká republika, domácí), Irena KRONTORÁD KOUTNÁ (203 Česká republika, garant, domácí), Zdeněk RÁČIL (203 Česká republika, domácí) a Jiří MAYER (203 Česká republika, domácí)
Vydání
ASH 2010, 2010
Další údaje
Jazyk
angličtina
Typ výsledku
Konferenční abstrakt
Obor
30200 3.2 Clinical medicine
Stát vydavatele
Spojené státy
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 10.558
Kód RIV
RIV/00216224:14330/10:00046220
Organizační jednotka
Fakulta informatiky
ISSN
Klíčová slova anglicky
dasatinib; CML
Změněno: 3. 1. 2011 15:19, Mgr. Pavel Šimara, Ph.D.
Anotace
V originále
Chronic myeloid leukaemia (CML) is a clonal disorder of haematopoietic stem cells, characterized by constitutively active BCR-ABL kinase. It was previously shown, that transient inhibition of BCR-ABL by tyrosin kinase inhibitor (TKI) dasatinib induces apoptosis in CML cells (Shah 2008). Dasatinib mediated apoptosis is accompanied by increasing expression level of proapoptotic protein BIM and inhibition of its degradation in proteasome. Our aim is to find alterations in BCR-ABL downstream pathways and changes in BIM expression after pulse (wash-out after 20min) or continuous treatment with TKI dasatinib alone or in combination with proteasome inhibitor bortezomib in K562 cells. Higher mRNA levels of BIM were confirmed in both transiently and continuously treated (100nM dasatinib) K562 cells compared to low dose continuous (1nM dasatinib) treatment. Western blot analysis of BCR-ABL induced signalling pathways activity revealed, among others, sustained inhibition of MEK/ERK pathway even in the case of re-activation of BCR-ABL after drug wash-out. MEK/ERK inhibition leads to activation of proapoptotic BIM expression and inhibition of its degradation. We used bortezomib, a reversible inhibitor of proteasome, in order to test the block of BIM degradation in dasatinib treated cells. However, we have not found any difference in cell viability caused by adding of 30nM bortezomib to dasatinib treated cells neither in continuous or transient exposure. These findings suggest that equal increase of BIM in the case of pulse and continuous dasatinib treatment is caused by MEK/ERK inhibition in cells with restored BCR-ABL activity.
Návaznosti
MSM0021622430, záměr |
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2B06052, projekt VaV |
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