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PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane

PURPOSE: To investigate the functional significance of MIP/AQP0 phosphorylation at serine(235). METHODS: MIP/AQP0 expression and cellular localization was studied in rat lens epithelia explants induced to differentiate by FGF-2. MIP wild type (WT) and MIP (S235A) mutant expression plasmids were cons...

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Autores principales: Golestaneh, Nady, Fan, Jianguo, Zelenka, Peggy, Chepelinsky, Ana B.
Formato: Texto
Lenguaje:English
Publicado: Molecular Vision 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2405813/
https://www.ncbi.nlm.nih.gov/pubmed/18523655
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author Golestaneh, Nady
Fan, Jianguo
Zelenka, Peggy
Chepelinsky, Ana B.
author_facet Golestaneh, Nady
Fan, Jianguo
Zelenka, Peggy
Chepelinsky, Ana B.
author_sort Golestaneh, Nady
collection PubMed
description PURPOSE: To investigate the functional significance of MIP/AQP0 phosphorylation at serine(235). METHODS: MIP/AQP0 expression and cellular localization was studied in rat lens epithelia explants induced to differentiate by FGF-2. MIP wild type (WT) and MIP (S235A) mutant expression plasmids were constructed and transiently expressed in RK13 cells. Subcellular localization of endogenous MIP in differentiating lens epithelia explants or of transfected MIP expression vectors in RK13 cells was analyzed by immunofluorescence confocal microscopy. RESULTS: MIP/AQP0 expressed in lens epithelia explants induced to differentiate by FGF-2 localizes to the plasma membrane of elongating cells. However, MIP/AQP0 translocation to the plasma membrane was prevented by inhibiting PKC activity with Go6976, resulting in retention in the cytoplasmic compartment. This effect was specific to MIP/AQP0; localization of AQP1 to the cell membrane was not affected by Go6976. When the consensus PKC phosphorylation site at MIP Ser(235) was mutated to alanine and transiently expressed in transfected RK13 cells, the mutant MIP was retained in the cytoplasmic compartment in contrast to WT MIP that localized to the plasma membrane of the transfected RK13 cells. Colocalization studies indicated that the mutant MIP was retained in the trans-Golgi network. CONCLUSIONS: Our results indicate that serine(235) is required for proper intracellular transport of MIP/AQP0 from the trans-Golgi network to the plasma membrane. A PKC dependent phosphorylation event involving MIP at serine(235) is most likely involved in this process.
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spelling pubmed-24058132008-06-03 PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane Golestaneh, Nady Fan, Jianguo Zelenka, Peggy Chepelinsky, Ana B. Mol Vis Research Article PURPOSE: To investigate the functional significance of MIP/AQP0 phosphorylation at serine(235). METHODS: MIP/AQP0 expression and cellular localization was studied in rat lens epithelia explants induced to differentiate by FGF-2. MIP wild type (WT) and MIP (S235A) mutant expression plasmids were constructed and transiently expressed in RK13 cells. Subcellular localization of endogenous MIP in differentiating lens epithelia explants or of transfected MIP expression vectors in RK13 cells was analyzed by immunofluorescence confocal microscopy. RESULTS: MIP/AQP0 expressed in lens epithelia explants induced to differentiate by FGF-2 localizes to the plasma membrane of elongating cells. However, MIP/AQP0 translocation to the plasma membrane was prevented by inhibiting PKC activity with Go6976, resulting in retention in the cytoplasmic compartment. This effect was specific to MIP/AQP0; localization of AQP1 to the cell membrane was not affected by Go6976. When the consensus PKC phosphorylation site at MIP Ser(235) was mutated to alanine and transiently expressed in transfected RK13 cells, the mutant MIP was retained in the cytoplasmic compartment in contrast to WT MIP that localized to the plasma membrane of the transfected RK13 cells. Colocalization studies indicated that the mutant MIP was retained in the trans-Golgi network. CONCLUSIONS: Our results indicate that serine(235) is required for proper intracellular transport of MIP/AQP0 from the trans-Golgi network to the plasma membrane. A PKC dependent phosphorylation event involving MIP at serine(235) is most likely involved in this process. Molecular Vision 2008-05-29 /pmc/articles/PMC2405813/ /pubmed/18523655 Text en http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Golestaneh, Nady
Fan, Jianguo
Zelenka, Peggy
Chepelinsky, Ana B.
PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane
title PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane
title_full PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane
title_fullStr PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane
title_full_unstemmed PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane
title_short PKC putative phosphorylation site Ser(235) is required for MIP/AQP0 translocation to the plasma membrane
title_sort pkc putative phosphorylation site ser(235) is required for mip/aqp0 translocation to the plasma membrane
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2405813/
https://www.ncbi.nlm.nih.gov/pubmed/18523655
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