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Geldanamycin and herbimycin A induce apoptotic killing of B chronic lymphocytic leukemia cells and augment the cells' sensitivity to cytotoxic drugs.

Jones, DT; Addison, E; North, JM; Lowdell, MW; Hoffbrand, AV; Mehta, AB; Ganeshaguru, K; ... Wickremasinghe, RG; + view all (2004) Geldanamycin and herbimycin A induce apoptotic killing of B chronic lymphocytic leukemia cells and augment the cells' sensitivity to cytotoxic drugs. Blood , 103 (5) pp. 1855-1861. 10.1182/blood-2003-05-1603. Green open access

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Abstract

We studied the actions of geldanamycin (GA) and herbimycin A (HMA), inhibitors of the chaperone proteins Hsp90 and GRP94, on B chronic lymphocytic leukemia (CLL) cells in vitro. Both drugs induced apoptosis of the majority of CLL isolates studied. Whereas exposure to 4-hour pulses of 30 to 100 nM GA killed normal B lymphocytes and CLL cells with similar dose responses, T lymphocytes from healthy donors as well as those present in the CLL isolates were relatively resistant. GA, but not HMA, showed a modest cytoprotective effect toward CD34+ hematopoietic progenitors from normal bone marrow. The ability of bone marrow progenitors to form hematopoietic colonies was unaffected by pulse exposures to GA. Both GA and HMA synergized with chlorambucil and fludarabine in killing a subset of CLL isolates. GA- and HMA-induced apoptosis was preceded by the up-regulation of the stress-responsive chaperones Hsp70 and BiP. Both ansamycins also resulted in down-regulation of Akt protein kinase, a modulator of cell survival. The relative resistance of T lymphocytes and of CD34+ bone marrow progenitors to GA coupled with its ability to induce apoptosis following brief exposures and to synergize with cytotoxic drugs warrant further investigation of ansamycins as potential therapeutic agents in CLL.

Type: Article
Title: Geldanamycin and herbimycin A induce apoptotic killing of B chronic lymphocytic leukemia cells and augment the cells' sensitivity to cytotoxic drugs.
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1182/blood-2003-05-1603
Keywords: Antibiotics, Antineoplastic, Antigens, CD34, Apoptosis, Benzoquinones, Blotting, Western, Bone Marrow Cells, Cell Separation, Chlorambucil, Down-Regulation, Enzyme Inhibitors, Flow Cytometry, HSP70 Heat-Shock Proteins, Humans, Inhibitory Concentration 50, Lactams, Macrocyclic, Leukemia, Lymphocytic, Chronic, B-Cell, Polymerase Chain Reaction, Protein-Tyrosine Kinases, Quinones, RNA, Messenger, Rifabutin, T-Lymphocytes, Time Factors, Tumor Suppressor Protein p53, Up-Regulation, Vidarabine, ZAP-70 Protein-Tyrosine Kinase
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Haematology
URI: http://discovery.ucl.ac.uk/id/eprint/7115
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