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Differential expression and localisation of WWP1, a Nedd4-like protein, in epithelia

  • Epithelial Transport
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Abstract

Ubiquitination of proteins such as ion transporters appears to be an important process in the regulation of their membrane expression. Recently, using two-hybrid screening, we have selected a potential partner for the α-subunit of the amiloride-sensitive epithelial sodium channel (ENaC): the WWP1 protein, a ubiquitin ligase belonging to the Nedd4 family. To establish whether WWP1 is co-expressed with ENaC, we employed in situ hybridisation, immunohistochemistry and Western blotting to determine the expression of WWP1 in various tissues and cell lines, including those known to express ENaC. As expected, WWP1 was expressed, like ENaC, in the bronchiolar epithelium. However it was also present in the proximal colon and the proximal part of the nephron (where ENaC is not expressed) and absent in the distal parts of the nephron (where ENaC is expressed abundantly). These results suggest that other channels or transport proteins, containing specific domains, such as PY motifs, could be the targets for regulation by WWP1.

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Acknowledgements

We thank Olivier Staub for generous gift of Xenopus lysates and anti-Nedd4-HECT antibodies. We are grateful to U409, U478 and IFR members for helpful discussions and help during the writing of this manuscript. Laurence Malbert-Colas is the recipient of a grant from La Ligue Nationale contre le Cancer (France).

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Authors and Affiliations

  1. INSERM Unité 409, Faculté de Médecine X. Bichat, BP416, 75870, Paris Cedex 18, France

    Laurence Malbert-Colas, Didier Dhermy & Marie-Christine Lecomte

  2. INSERM U478, Faculté de Médecine X. Bichat, Paris, France

    Michel Fay, Françoise Cluzeaud, Marcel Blot-Chabaud & Nicolette Farman

  3. IFR02 Institut Claude Bernard physiologie et pathologie, Paris, France

    Laurence Malbert-Colas, Michel Fay, Françoise Cluzeaud, Marcel Blot-Chabaud, Nicolette Farman, Didier Dhermy & Marie-Christine Lecomte

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  1. Laurence Malbert-Colas
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  2. Michel Fay
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  3. Françoise Cluzeaud
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  4. Marcel Blot-Chabaud
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  5. Nicolette Farman
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  6. Didier Dhermy
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  7. Marie-Christine Lecomte
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Correspondence to Marie-Christine Lecomte.

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Malbert-Colas, L., Fay, M., Cluzeaud, F. et al. Differential expression and localisation of WWP1, a Nedd4-like protein, in epithelia. Pflugers Arch - Eur J Physiol 447, 35–43 (2003). https://doi.org/10.1007/s00424-003-1152-6

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  • DOI: https://doi.org/10.1007/s00424-003-1152-6

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