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Mol Cancer Ther ; 10(9): 1542-52, 2011 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-21764904


We describe here the identification and characterization of 2 novel inhibitors of the fibroblast growth factor receptor (FGFR) family of receptor tyrosine kinases. The compounds exhibit selective inhibition of FGFR over the closely related VEGFR2 receptor in cell lines and in vivo. The pharmacologic profile of these inhibitors was defined using a panel of human tumor cell lines characterized for specific mutations, amplifications, or translocations known to activate one of the four FGFR receptor isoforms. This pharmacology defines a profile for inhibitors that are likely to be of use in clinical settings in disease types where FGFR is shown to play an important role.

Antineoplásicos/farmacología , Factores de Crecimiento de Fibroblastos/metabolismo , Inhibidores de Proteínas Quinasas/farmacología , Receptores de Factores de Crecimiento de Fibroblastos/antagonistas & inhibidores , Animales , Antineoplásicos/química , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Supervivencia Celular/efectos de los fármacos , Diseño de Fármacos , Evaluación Preclínica de Medicamentos , Humanos , Ratones , Ratones Endogámicos BALB C , Ratones Desnudos , Modelos Moleculares , Neoplasias/tratamiento farmacológico , Neoplasias/metabolismo , Inhibidores de Proteínas Quinasas/química , Inhibidores de Proteínas Quinasas/uso terapéutico , Receptores de Factores de Crecimiento de Fibroblastos/genética , Transducción de Señal/efectos de los fármacos , Resultado del Tratamiento , Ensayos Antitumor por Modelo de Xenoinjerto
Br J Haematol ; 150(1): 46-57, 2010 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-20507304


Constitutive activation of Janus kinase (Jak) 2 is the most prevalent pathogenic event observed in the myeloproliferative disorders (MPD), suggesting that inhibitors of Jak2 may prove valuable in their management. Inhibition of the Aurora kinases has also proven to be an effective therapeutic strategy in a number of haematological malignancies. AT9283 is a multi-targeted kinase inhibitor with potent activity against Jak2 and Aurora kinases A and B, and is currently being evaluated in clinical trials. To investigate the therapeutic potential of AT9283 in the MPD we studied its activity in a number of Jak2-dependent systems. AT9283 potently inhibited proliferation and Jak2-related signalling in Jak2-dependent cell lines as well as inhibiting the formation of erythroid colonies from haematopoietic progenitors isolated from MPD patients with Jak2 mutations. The compound also demonstrated significant therapeutic potential in vivo in an ETV6-JAK2 (TEL-JAK2) murine leukaemia model. Inhibition of both Jak2 and Aurora B was observed in the model systems used, indicating a dual mechanism of action. Our results suggest that AT9283 may be a valuable therapy in patients with MPD and that the dual inhibition of Jak2 and the Aurora kinases may potentially offer combinatorial efficacy in the treatment of these diseases.

Antineoplásicos/farmacología , Bencimidazoles/farmacología , Janus Quinasa 2/antagonistas & inhibidores , Trastornos Mieloproliferativos/tratamiento farmacológico , Proteínas Serina-Treonina Quinasas/antagonistas & inhibidores , Urea/análogos & derivados , Animales , Antineoplásicos/uso terapéutico , Aurora Quinasa B , Aurora Quinasas , Bencimidazoles/uso terapéutico , Ciclo Celular/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Relación Dosis-Respuesta a Droga , Evaluación Preclínica de Medicamentos/métodos , Células Precursoras Eritroides/efectos de los fármacos , Humanos , Janus Quinasa 2/genética , Janus Quinasa 2/fisiología , Leucemia Experimental/tratamiento farmacológico , Leucemia Experimental/patología , Masculino , Ratones , Ratones Endogámicos BALB C , Ratones Desnudos , Mutación , Trastornos Mieloproliferativos/genética , Trastornos Mieloproliferativos/patología , Transducción de Señal/efectos de los fármacos , Células Tumorales Cultivadas , Urea/farmacología , Urea/uso terapéutico , Ensayos Antitumor por Modelo de Xenoinjerto