In vitro antileukemic activity of novel adenosine derivatives bearing boron cluster modification.

A series of adenosine derivatives bearing a boron cluster were synthesized and evaluated for their cytotoxicity against primary peripheral mononuclear cells from the blood of 17 patients with leukemias (16 CLL and 1 very rare PLL), as well as from 5 healthy donors used as a control. Among the tested agents, two, i.e.

In vivo and ex vivo responses of CLL cells to purine analogs combined with alkylating agent.

Background: The heterogeneity of chronic lymphocytic leukemia (CLL) is thought to be due to differences in the expression of factors that regulate apoptosis and cell cycle, giving rise to diverse apoptotic disturbances and tumor properties. Therefore, the primary goal in CLL treatment is to overcome resistance to apoptosis and efficiently trigger this process in leukemic cells.

Methods: Mononuclear cells were obtained from the blood of CLL patients by Histopaque-1077 sedimentation.

Promising anti-leukemic activity of atorvastatin.

There is a current need for novel therapeutic strategies for the treatment of chronic lymphocytic leukemia (CLL), a still incurable hematological cancer involving mainly deregulated apoptosis. The purpose of the present study was to determine ex vivo the effect of the synthetic statin, atorvastatin, a known cholesterol-lowering drug, on peripheral blood mononuclear cells obtained from CLL patients. Using flow cytometry, we investigated the viability and induction of apoptosis in leukemic cells exposed to statin by the Vybrant apoptosis assay kit #4, compared with untreated control cells.

Can ex vivo evaluation (testing) predict the sensitivity of CLL cells to therapy with purine analogs in conjunction with an alkylating agent? A comparison of in vivo and ex vivo responses to treatment.

Malfunctions in the regulation of apoptosis cause the accumulation of malignant, long-lived B CD19+/CD5+ cells in chronic lymphocytic leukemia (CLL). The primary goal in CLL therapy is to overcome resistance to apoptosis and efficiently trigger programmed cell death in leukemic cells. This study demonstrated that the in vivo responses of malignant cells from CLL patients after administration of purine analogs (cladribine/fludarabine) with cyclophosphamide vary significantly.

[Biological activity of poly(ADP-ribose)polymerase-1].

Poly(ADP-ribose)polymerase-1 (PARP-1) catalyzes the polymerization of ADP-ribose units from NAD+ modules on target proteins, resulting in the attachment of linear or branched polymers. PARP-1 and its product poly(ADP-ribose)--PAR have recently received considerable attention because of their involvement in a wide range of cellular processes including chromatin modification, metabolism of nucleic acids, transcription regulation, and cell death. This review summarizes recent work on modular structure of six functional domains (A-F) of PARP-1 molecule in the context of three classic domains, i.