53 research outputs found

    Deletion of chromosomal region 8p21 confers resistance to Bortezomib and is associated with upregulated Decoy trail receptor expression in patients with multiple myeloma

    Get PDF
    Loss of the chromosomal region 8p21 negatively effects survival in patients with multiple myeloma (MM) that undergo autologous stem cell transplantation (ASCT). In this study, we aimed to identify the immunological and molecular consequences of del(8)(p21) with regards to treatment response and bortezomib resistance. In patients receiving bortezomib as a single first line agent without any high-dose therapy, we have observed that patients with del(8)(p21) responded poorly to bortezomib with 50% showing no response while patients without the deletion had a response rate of 90%. In vitro analysis revealed a higher resistance to bortezomib possibly due to an altered gene expression profile caused by del(8)(p21) including genes such as TRAIL-R4, CCDC25, RHOBTB2, PTK2B, SCARA3, MYC, BCL2 and TP53. Furthermore, while bortezomib sensitized MM cells without del(8)(p21) to TRAIL/APO2L mediated apoptosis, in cells with del(8)(p21) bortezomib failed to upregulate the pro-apoptotic death receptors TRAIL-R1 and TRAIL-R2 which are located on the 8p21 region. Also expressing higher levels of the decoy death receptor TRAIL-R4, these cells were largely resistant to TRAIL/APO2L mediated apoptosis. Corroborating the clinical outcome of the patients, our data provides a potential explanation regarding the poor response of MM patients with del(8)(p21) to bortezomib treatment. Furthermore, our clinical analysis suggests that including immunomodulatory agents such as Lenalidomide in the treatment regimen may help to overcome this negative effect, providing an alternative consideration in treatment planning of MM patients with del(8)(p21)

    Molecular signatures for CCN1, p21 and p27 in progressive mantle cell lymphoma

    Get PDF
    Mantle cell lymphoma (MCL) is a comparatively rare non-Hodgkin’s lymphoma characterised by overexpression of cyclin D1.Many patients present with or progress to advanced stage disease within 3 years. MCL is considered an incurable disease withmedian survival between 3 and 4 years. We have investigated the role(s) of CCN1 (CYR61) and cell cycle regulators inprogressive MCL. We have used the human MCL cell lines REC1 G519 > JVM2 cells by RQ-PCR, depicting a decrease in CCN1expression with disease progression. Investigation of CCN1 isoform expression by western blotting showed that whilst expres-sion of full-length CCN1 was barely altered in the cell lines, expression of truncated forms (18–20 and 28–30 kDa) decreasedwith disease progression. We have then demonstrated that cyclin D1 and cyclin dependent kinase inhibitors (p21CIP1and p27KIP1)are also involved in disease progression. Cyclin D1 was highly expressed in REC1 cells (OD: 1.0), reduced to one fifth in G519cells (OD: 0.2) and not detected by western blotting in JVM2 cells. p27KIP1followed a similar profile of expression as cyclin D1.Conversely, p21CIP1was absent in the REC1 cells and showed increasing expression in G519 and JVM2 cells. Subcellularlocalization detected p21CIP1/p27KIP1primarily within the cytoplasm and absent from the nucleus, consistent with altered roles in treatment resistance. Dysregulation of the CCN1 truncated forms are associated with MCL progression. In conjunction withreduced expression of cyclin D1 and increased expression of p21, this molecular signature may depict aggressive disease andtreatment resistance

    El problema de Kepler en un sistema de referencia rotante. Estudio topológico del espacio fásico

    No full text
    En este trabajo se describe la dinámica hamiltoniana, en unas variedades invariantes del movimiento kepleriano en un sistema de referencia rotante. Por medio del teorema Liouville-Arnold y un estudio particular de la aplicación momento en sus puntos críticos, obtenemos una completa clasificación del espacio fásico asociado a este sistema. Este problema modela numerosos tipos de movimientos de cuerpos como el movimiento de un satélite con respecto a un sistema de referencia situado en la tierra, el movimiento relativo de órbitas y el movimiento de satélites volantes en formación, esto es, los satélites múltiples que trabajan juntos en un grupo para lograr el objetivo de uno más grande, generalmente más costoso.Asociación de Jóvenes Investigadores de Cartagena, (AJICT). Universidad Politécnica de Cartagena. Escuela Técnica Superior de Ingeniería Industrial UPCT, (ETSII). Escuela Técnica Superior de Ingeniería Agronómica, (ETSIA), Escuela Técnica Superior de Ingeniería de Telecomunicación (ETSIT). Cátedra Bancaja Jóvenes Emprendedores. Hero. Parque Tecnológico de Fuente Álamo. Grupo Aquiline

    Análisis cualitativo del flujo fásico de un sistema Manev en un sistema de referencia rotante

    No full text
    En este trabajo se describe el espacio de fases global de un sistema Manev en un sistema de referencia rotante. Describimos la dinámica hamiltoniana en las fibras donde el vector del momento angular total es constante, en ciertas variedades de movimiento que son invariantes. Finalmente, usando el teorema de Liouville-Arnold y un estudio particular de la aplicación momento en sus puntos críticos, obtenemos una completa clasificación de los diferentes conjuntos invariantes del espacio fásico. Los resultados de este trabajo pueden aplicarse en el estudio de la precesión de Mercurio, de manera que se usa mecánica clásica en lugar de utilizar mecánica relativista.Asociación de Jóvenes Investigadores de Cartagena, (AJICT). Universidad Politécnica de Cartagena. Escuela Técnica Superior de Ingeniería Industrial UPCT, (ETSII). Escuela Técnica Superior de Ingeniería Agronómica, (ETSIA), Escuela Técnica Superior de Ingeniería de Telecomunicación (ETSIT). Cátedra Bancaja Jóvenes Emprendedores. Hero. Parque Tecnológico de Fuente Álamo. Grupo Aquiline
    corecore