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Cellular localization of facilitated glucose transporter 1 (GLUT-1) in the cochlear stria vascularis: its possible contribution to the transcellular glucose pathway

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Abstract

Immunoreactivity for the facilitated glucose transporter 1 (GLUT-1) has been found in the cochlear stria vascularis, but whether the strial marginal cells are immunopositive for GLUT-1 remains uncertain. To determine the cellular localization of GLUT-1 and to clarify the glucose pathway in the stria vascularis of rats and guinea pigs, immunohistochemistry was performed on sections, dissociated cells, and whole-tissue preparations. Immunoreactivity for GLUT-1 in sections was observed in the basal side of the strial tissue and in capillaries in both rats and guinea pigs. However, the distribution of the positive signals within the guinea pig strial tissue was more diffuse than that in rats. Immunostaining of dissociated guinea pig strial cells revealed GLUT-1 in the basal cells and capillary endothelial cells, but not in the marginal cells. These results indicated that GLUT-1 was not expressed in the marginal cells, and that another isoform of GLUT was probably expressed in these cells. Three-dimensional observation of whole-tissue preparations demonstrated that cytoplasmic prolongations from basal cells extended upward to the apical surface of the stria vascularis from rats and guinea pigs, and that the marginal cells were surrounded by these protrusions. We speculate that these upward extensions of basal cells have been interpreted as basal infoldings of marginal cells in previous reports from other groups. The three-dimensional relationship between marginal cells and basal cells might contribute to the transcellular glucose pathway from perilymph to intrastrial space.

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Authors and Affiliations

  1. Laboratory of Cell Physiology, Department of Science Education, Okayama University, Okayama, 700-8530, Japan

    Motonori Ando, Midori Edamatsu & Sho Fukuizumi

  2. Department of Otolaryngology, Kagawa Inoshita Hospital, Kanonji, 769-1613, Japan

    Shunji Takeuchi

Authors
  1. Motonori Ando
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  2. Midori Edamatsu
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  3. Sho Fukuizumi
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  4. Shunji Takeuchi
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Correspondence to Motonori Ando.

Additional information

This study was supported by a grant-in-aid for scientific research (19570058) from The Ministry of Education, Culture, Sports, Science, and Technology of Japan.

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Ando, M., Edamatsu, M., Fukuizumi, S. et al. Cellular localization of facilitated glucose transporter 1 (GLUT-1) in the cochlear stria vascularis: its possible contribution to the transcellular glucose pathway. Cell Tissue Res 331, 763–769 (2008). https://doi.org/10.1007/s00441-007-0495-2

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  • DOI: https://doi.org/10.1007/s00441-007-0495-2

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