Histochemistry and Cell Biology

, Volume 127, Issue 3, pp 233–241 | Cite as

Differential localization of aquaporin-2 and glucose transporter 4 in polarized MDCK cells

  • Takahiro Hasegawa
  • Toshiyuki Matsuzaki
  • Yuki Tajika
  • Abduxukur Ablimit
  • Takeshi Suzuki
  • Takeo Aoki
  • Haruo Hagiwara
  • Kuniaki Takata
Original Paper


Membrane water channel aquaporin-2 (AQP2) and glucose transporter 4 (GLUT4) exhibit a common feature in that they are stored in intracellular storage compartments and undergo translocation to the plasma membrane upon hormonal stimulation. We compared the intracellular localization and trafficking of AQP2 and GLUT4 in polarized Madin-Darby canine kidney cells stably transfected with human AQP2 (MDCK-hAQP2) by immunofluorescence microscopy. When expressed in MDCK-hAQP2 cells, GLUT4 and GLUT4—EGFP were predominantly localized in the perinuclear region close to and within the Golgi apparatus, similar to endogenous GLUT4 in adipocytes and myocytes. In addition, GLUT4 was occasionally seen in EEA1-positive early endosomes. AQP2, on the other hand, was sequestered in subapical Rab11-positive vesicles. In the basal state, the intracellular storage site of GLUT4 was distinct from that of AQP2. Forskolin induced translocation of AQP2 from the subapical storage vesicles to the apical plasma membrane, which did not affect GLUT4 localization. When forskolin was washed out, AQP2 was first retrieved to early endosomes from the apical plasma membrane, where it was partly colocalized with GLUT4. AQP2 was then transferred to Rab11-positive storage vesicles. These results show that AQP2 and GLUT4 share a common compartment after retrieval from the plasma membrane, but their storage compartments are distinct from each other in polarized MDCK-hAQP2 cells.


AQP2 GLUT4 MDCK cells Storage compartment Early endosome 



We wish to thank Sachiko Fukushima for secretarial assistance. This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Takahiro Hasegawa
    • 1
  • Toshiyuki Matsuzaki
    • 1
  • Yuki Tajika
    • 2
  • Abduxukur Ablimit
    • 1
  • Takeshi Suzuki
    • 1
  • Takeo Aoki
    • 1
  • Haruo Hagiwara
    • 1
  • Kuniaki Takata
    • 1
  1. 1.Department of Anatomy and Cell BiologyGunma University Graduate School of MedicineGunmaJapan
  2. 2.Department of Neuromuscular and Developmental AnatomyGunma University Graduate School of MedicineGunmaJapan

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