Approach to new therapeutics: investigation by the use of MDS-derived cell lines.

Abstract:

:Myelodysplastic syndromes (MDS) are a group of aquired hematopoietic disorders characterized by ineffective hematopoiesis, and increased risk of progression of acute myeloid leukemia. For a long period of time, the standard therapy for MDS was hematopoietic stem cell transplantation, however DNA methyltransferase inhibitors (DNMT inhibitors) including decitabine (DAC) and azacitidine (AZA), and lenalidomide, a derivative of thalidomide have been highlighted as new chemotherapeutic agents for MDS. However, the underlying mechanisms of action of these drugs have not been fully defined yet. Therefore, we investigated the in vitro effects of DNMT inhibitors and lenalidomide on an MDS-derived cell line, MDS92 and its blastic subline MDS-L, both of which carry del(5q). MDS-L cells were found to be quite sensitive to DAC, which induced to cell death through DNA damage-mediated G2 arrest via p53- independent pathways. Gene expression profiling suggested that DAC affects biogroups representing hematological systems, cellular development, cell death and apoptosis. Next, we examined the effects of lenalidomide on MDS-L. Cell growth was inhibited and multinucleated cells were frequently formed prior to cell death by lenalidomide treatment. Time-lapse microscopic observation and DNA ploidy analysis revealed that lenalidomide does not affect DNA synthesis itself but inhibits cytokinesis of MDS-L cells. The gene expression profiling showed decreased expression of M phase-related genes. These data contribute to the understanding of action mechanisms of lenalidomide on MDS with del(5q).

journal_name

Curr Pharm Des

authors

Tsujioka T,Matsuoka A,Tohyama Y,Tohyama K

doi

10.2174/1381612811209023204

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

3204-14

issue

22

eissn

1381-6128

issn

1873-4286

pii

CPD-EPUB-20120507-014

journal_volume

18

pub_type

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