Abstract
We searched iron-deficient inducible cDNA, using subtraction cloning and mRNA from desferrioxamine-treated mouse macrophage Raw264.7 cells. We identified a pleomorphic adenoma gene like 2 (PLAGL2), one of PLAG superfamily proteins exhibiting antiproliferative properties on tumor cells. Mouse PLAGL2 consists of 496 amino acids with seven C2H2 zinc-fingers. PLAGL2 mRNA was induced in RAW264.7 cells, mouse erythroleukemia cells and Balb/c 3T3 cells when they were treated with desferrioxamine. Hypoxia also increased PLAGL2 mRNA. Expression of PLAGL2 in COS-7 cells led to nuclear localization. PLAGL2 had potential binding ability to GC-rich oligonucleotide and activated transcription of a gene with the binding sequence in transient reporter assay, a finding consistent with a case seen in a PLAGL2 homolog, ZAC-1. Transient co-transfection of PLAGL2 or ZAC1 cDNA and a reporter containing a lactate dehydrogenase A (LDHA) promoter carrying the hypoxia inducible factor-1 responsive element led to an increase in the basal transcription in Balb/c 3T3 and HepG2 cells. Activation in transcription from the LDHA promoter increased by desferrioxamine treatment or hypoxia was further enhanced when PLAGL2 was expressed. We propose that PLAGL2 is involved in the cell cycle arrest and apoptosis of tumor cells by regulating iron depletion- or hypoxia-inducible gene expression.
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Abbreviations
- IRE:
-
iron-responsive element
- IRF:
-
iron regulatory factors
- HIF-1:
-
hypoxia inducible factor-1
- LDHA:
-
lactate dehydrogenase A
- PLAG:
-
pleomorphic adenomas gene
- PLAGL1/2:
-
PLAG like 1/2
- FCS:
-
fetal calf serum
- DMEM:
-
Dulbecco's modified Eagle medium
- MEL:
-
mouse erythroleukemia
- DTT:
-
dithiothreitol
- PMSF:
-
phenylmethylsulfonyl fluoride
- TK:
-
thymidine kinase
- GST:
-
glutathione S-transferase, PCR, polymerase chain reaction
- kb:
-
kilobase pair(s)
- kDa:
-
kilodalton(s)
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Acknowledgements
We thank K Yasaka for excellent technical assistance and M Ohara for comments. This study was supported in part by grants from Ministry of Education, Science, Sports and Culture of Japan.
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Furukawa, T., Adachi, Y., Fujisawa, Ji. et al. Involvement of PLAGL2 in activation of iron deficient- and hypoxia-induced gene expression in mouse cell lines. Oncogene 20, 4718–4727 (2001). https://doi.org/10.1038/sj.onc.1204647
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DOI: https://doi.org/10.1038/sj.onc.1204647
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