Abstract
The vav proto-oncogene product is a 95 kDa protein predominantly expressed in hematopoietic cells. Vav presents a wide range of functional domains, including structural domains known to be involved in signal transduction. Triggering of various cytokine receptors among which type I interferon receptor induces a rapid and transient tyrosine phosphorylation of p95vav. Nevertheless, the biological functions of p95vav are still unclear. This report is the first documentation on the physical association of p95vav with both α and β type I interferon receptor chains, as demonstrated by co-immunoprecipitation and Western blot analysis in megakaryocytic cells (Dami and UT7). This interaction is increased by interferon-α/β stimulation. Moreover, p95vav phosphorylated subsequently to type I interferon treatment, is translocated in the nucleus; a concomitant increase of its association with the regulatory subunit of the nuclear DNA-dependent protein kinase, KU-70 is observed in the nucleus. To determine whether p95vav participates in the biological response to type I interferons, we studied the effects of non modified Vav oligodeoxynucleotides on the antiproliferative effect of interferon-α on megakaryocytic cells. By this oligodeoxynucleotide strategy, we show that p95vav contributes greatly to the cell proliferation inhibition induced by type I IFN.
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Abbreviations
- IFN:
-
Interferon
- IFNAR:
-
Interferon Alpha Receptor
- GM-CSF:
-
Granulocyte Macrophage Colony-Stimulating Factor
- Stats:
-
Signal transducers and activators proteins
- ISGF3:
-
Interferon-Stimulated Gene Factor 3
- CML:
-
Chronic Myelogenous Leukemia
- CMPDs:
-
Chronic Myeloproliferative Disorders
- Epo:
-
Erythropoietin
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Acknowledgements
This work was supported by the Reseau de Recherche Clinique INSERM no 4R006C and a grant from ARC no 9806.
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Micouin, A., Wietzerbin, J., Steunou, V. et al. p95vav associates with the type I interferon (IFN) receptor and contributes to the antiproliferative effect of IFN-α in megakaryocytic cell lines. Oncogene 19, 387–394 (2000). https://doi.org/10.1038/sj.onc.1203314
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DOI: https://doi.org/10.1038/sj.onc.1203314
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