Abstract:
:The NK-like family of homeobox genes includes TLX1, TLX3 and NKX2-5, which are ectopically activated in distinct subsets of T-cell acute lymphoblastic leukemia (T-ALL) cells. Here we analysed their effect on the miR-17-92 cluster overexpressed in several types of cancer, including T-ALL. The pri-miR-17-92 polycistron encodes micro-RNAs (miRNAs), which decrease E2F1 protein expression, regulating proliferation and/or apoptosis. Quantification of pri-miR-17-92 in T-ALL cell lines suggested an implication of the NK-like homeodomain proteins in transcriptional regulation. Lentiviral-mediated overexpression of NKX2-5 in the T-ALL cell line MOLT-4 consistently resulted in increased miR-17-92 pri-miRNA levels and decreased amounts of E2F1 protein. Induction of apoptosis by treating miR17-92 or E2F1 transduced T-ALL cells with etoposide led to reduced or enhanced cell viability, respectively. Furthermore, analysis of pri-miR-17-92 in T-ALL patients indicated elevated expression in those bearing TLX1/3 positive cells. These data support an activatory effect of NK-like homeodomain proteins on pri-miR-17-92 expression and concomitantly reduced E2F1 protein levels, thereby enhancing survival of leukemic T-cells.
journal_name
Leuk Lymphomajournal_title
Leukemia & lymphomaauthors
Nagel S,Venturini L,Przybylski GK,Grabarczyk P,Schmidt CA,Meyer C,Drexler HG,Macleod RA,Scherr Mdoi
10.1080/10428190802626632subject
Has Abstractpub_date
2009-01-01 00:00:00pages
101-8issue
1eissn
1042-8194issn
1029-2403pii
907842963journal_volume
50pub_type
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