Abstract
p73 is a novel member of the p53 family of tumor suppressor proteins which is involved in cellular differentiation, tumor suppression, and the response to genotoxic stress. The molecular mechanisms regulating p73 activity are still poorly understood. Recently, p73 was found to be a target of the enzymatic activity of c-Abl, a non-receptor tyrosine kinase that potently activated in response to DNA damage. Here, we present evidence that c-Abl induces the phosphorylation of p73 in threonine residues adjacent to prolines, and that the p38 MAP kinase pathway mediates this response. Furthermore, we found that activation of p38 is sufficient to enhance the stability of p73, and that the transcriptional activation of p73 by c-Abl requires the activity of p38. These findings indicate that members of the MAP kinases superfamily of signaling molecules can regulate p73, and support a role for the p38 MAP kinase in a novel biochemical pathway by which c-Abl regulates this p53-related molecule.
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Acknowledgements
We appreciate the comments of K Sakabe, C Murga, H Miyazaki, A Senderowicz, S Montaner, B Fletcher, V Patel and S Ramon y Cajal. We also appreciate the assistance and advice of L Vitale-Cross, C Parada and J Guinea.
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Sanchez-Prieto, R., Sanchez-Arevalo, V., Servitja, JM. et al. Regulation of p73 by c-Abl through the p38 MAP kinase pathway. Oncogene 21, 974–979 (2002). https://doi.org/10.1038/sj.onc.1205134
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DOI: https://doi.org/10.1038/sj.onc.1205134
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