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Protein phosphatase complex PP5/PPP2R3C dephosphorylates P-glycoprotein/ABCB1 and down-regulates the expression and function.
Katayama, Kazuhiro; Yamaguchi, Miho; Noguchi, Kohji; Sugimoto, Yoshikazu.
Afiliación
  • Katayama K; Division of Chemotherapy, Faculty of Pharmacy, Keio University, Japan.
  • Yamaguchi M; Division of Chemotherapy, Faculty of Pharmacy, Keio University, Japan.
  • Noguchi K; Division of Chemotherapy, Faculty of Pharmacy, Keio University, Japan.
  • Sugimoto Y; Division of Chemotherapy, Faculty of Pharmacy, Keio University, Japan. Electronic address: sugimoto-ys@pha.keio.ac.jp.
Cancer Lett ; 345(1): 124-31, 2014 Apr 01.
Article en En | MEDLINE | ID: mdl-24333728
P-glycoprotein (P-gp)/ABCB1 is a key molecule of multidrug resistance in cancer. Protein phosphatase (PP) 2A, regulatory subunit B, gamma (PPP2R3C), which is a regulatory subunit of PP2A and PP5, was identified as a binding candidate to P-gp. Immunoprecipitation-western blotting revealed that PP5 and PPP2R3C were coprecipitated with P-gp, while PP2A was not. PP5/PPP2R3C dephosphorylated protein kinase A/protein kinase C-phosphorylation of P-gp. Knockdown of PP5 and/or PPP2R3C increased P-gp expression and lowered the sensitivity to vincristine and doxorubicin. Consequently, our results indicate that PP5/PPP2R3C negatively regulates P-gp expression and function.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Glicoproteínas / Miembro 1 de la Subfamilia B de Casetes de Unión a ATP / Proteína Fosfatasa 2 Tipo de estudio: Prognostic_studies Idioma: En Revista: Cancer Lett Año: 2014 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Irlanda

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Glicoproteínas / Miembro 1 de la Subfamilia B de Casetes de Unión a ATP / Proteína Fosfatasa 2 Tipo de estudio: Prognostic_studies Idioma: En Revista: Cancer Lett Año: 2014 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Irlanda