The p14ARF tumor suppressor protein facilitates nucleolar sequestration of hypoxia-inducible factor-1alpha (HIF-1alpha ) and inhibits HIF-1-mediated transcription.

Department of Biochemistry, Loma Linda University, Loma Linda, California 92350, USA. kfatyol@hotmail.com
Oncogenic alterations can influence tumor cell survival partly by affecting the activity of the hypoxia-inducible factor-1 (HIF-1) transcription factor. The alpha subunit of HIF-1 was found to be frequently overexpressed in advanced tumors, which was proposed to help the adaptation of tumor cells to hypoxia. Here we show that an important tumor suppressor protein, p14ARF (alternative reading frame product of the INK4A locus) can directly inhibit the transcriptional activity of HIF-1 by sequestering its alpha subunit into the nucleolus. The interaction requires neither p53 nor HDM2. This is one of the first reports that describe the interaction of p14ARF with a protein besides HDM2, which may define a p53-independent tumor suppressor activity for p14ARF.
Mesh Terms:
Active Transport, Cell Nucleus, Animals, Blotting, Western, Cell Cycle, Cell Nucleus, Cyclin-Dependent Kinase Inhibitor p16, DNA-Binding Proteins, Flow Cytometry, Fluorescent Antibody Technique, Indirect, Genes, p53, Humans, Hypoxia-Inducible Factor 1, Hypoxia-Inducible Factor 1, alpha Subunit, Mice, Microscopy, Fluorescence, Nuclear Proteins, Plasmids, Precipitin Tests, Protein Binding, Protein Structure, Tertiary, Proteins, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-mdm2, Transcription Factors, Transcription, Genetic, Transfection, Tumor Cells, Cultured, Tumor Suppressor Protein p14ARF
J. Biol. Chem. Jul. 27, 2001; 276(30);28421-9 [PUBMED:11382768]
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