Involvement of RhoH GTPase in the development of B-cell chronic lymphocytic leukemia.

作者: A Sanchez-Aguilera , I Rattmann , D Z Drew , L U W Müller , V Summey

DOI: 10.1038/LEU.2009.217

关键词: Protein kinase BHaematopoiesisCancer researchThymocytebreakpoint cluster regionZAP70BiologyCD5Chronic lymphocytic leukemiaLeukopoiesis

摘要: RhoH is a hematopoietic-specific, GTPase-deficient member of the Rho GTPase family that functions as regulator thymocyte development and T-cell receptor signaling by facilitating localization zeta-chain-associated protein kinase 70 (ZAP70) to immunological synapse. Here we investigated function in B-cell lineage. (BCR) was intact Rhoh(-/-) mice. Because interacts with ZAP70, which prognostic factor chronic lymphocytic leukemia (CLL), analyzed mRNA levels primary human CLL cells showed 2.3-fold higher expression compared normal B cells. positively correlated ZAP70. Deletion Rhoh murine model (Emu-TCL1(Tg) mice) significantly delayed accumulation CD5(+)IgM(+) leukemic peripheral blood burden peritoneal cavity, bone marrow spleen mice their Rhoh(+/+) counterparts. Phosphorylation AKT ERK response BCR stimulation notably decreased Emu-TCL1(Tg);Rhoh(-/-) splenocytes. These data suggest has progression show altered samples.

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