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Haematologica ; 99(6): 1062-8, 2014 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24561792

RESUMEN

Adult B-cell acute lymphoblastic leukemia remains a major therapeutic challenge, requiring a better characterization of the molecular determinants underlying disease progression and resistance to treatment. Here, using a phospho-flow cytometry approach we show that adult diagnostic B-cell acute lymphoblastic leukemia specimens display PI3K/Akt pathway hyperactivation, irrespective of their BCR-ABL status and despite paradoxically high basal expression of PTEN, the major negative regulator of the pathway. Protein kinase CK2 is known to phosphorylate PTEN thereby driving PTEN protein stabilization and concomitant PTEN functional inactivation. In agreement, we found that adult B-cell acute lymphoblastic leukemia samples show significantly higher CK2 kinase activity and lower PTEN lipid phosphatase activity than healthy controls. Moreover, the clinical-grade CK2 inhibitor CX-4945 (Silmitasertib) reversed PTEN levels in leukemia cells to those observed in healthy controls, and promoted leukemia cell death without significantly affecting normal bone marrow cells. Our studies indicate that CK2-mediated PTEN posttranslational inactivation, associated with PI3K/Akt pathway hyperactivation, are a common event in adult B-cell acute lymphoblastic leukemia and suggest that CK2 inhibition may constitute a valid, novel therapeutic tool in this malignancy.


Asunto(s)
Fosfohidrolasa PTEN/metabolismo , Fosfatidilinositol 3-Quinasas/metabolismo , Leucemia-Linfoma Linfoblástico de Células Precursoras B/metabolismo , Proteínas Proto-Oncogénicas c-akt/metabolismo , Transducción de Señal , Adolescente , Adulto , Anciano , Estudios de Casos y Controles , Quinasa de la Caseína II/antagonistas & inhibidores , Quinasa de la Caseína II/metabolismo , Línea Celular , Aberraciones Cromosómicas , Activación Enzimática , Femenino , Expresión Génica , Humanos , Inmunohistoquímica , Quinasas Janus/metabolismo , Masculino , Persona de Mediana Edad , Fosfohidrolasa PTEN/genética , Inhibidores de las Quinasa Fosfoinosítidos-3 , Leucemia-Linfoma Linfoblástico de Células Precursoras B/genética , Inhibidores de Proteínas Quinasas/farmacología , Factores de Transcripción STAT/metabolismo , Transducción de Señal/efectos de los fármacos , Adulto Joven
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