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Proximal tubule morphology in rats with renal congestion: a study involving the in vivo cryotechnique

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Abstract

The present study aimed to examine the changes induced in proximal tubules by renal congestion using the in vivo cryotechnique (IVCT). Twelve male Wistar rats were divided into four equal groups: group 1 (the control); groups 2 and 3, which were subjected to 2 and 5 min of congestion, respectively; and group 4, which was subjected to 5 min of congestion followed by 10 min of recirculation. Under anesthesia, renal congestion was induced in the bilateral kidneys by ligating the inferior vena cava just above the branching renal veins. The left kidneys, which were subjected to the IVCT, were then compared with the right kidneys, which underwent a conventional fixation method. Among the left kidneys, the proximal tubules in group 1 consisted of cuboidal cells and had open lumina. In the congestive groups, the diameters of the proximal tubules were increased, and their lumina were obstructed by swollen cells and ischemia-associated cell debris. In group 4, the proximal tubules were still dilated, as seen in the congestive groups; however, the swollen cells had recovered their cuboidal form, and the cell debris had disappeared from the tubules’ lumina. The present study demonstrated the in vivo morphology of proximal tubules in living rats subjected to congestion, which was unclear using conventional fixation methods.

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Acknowledgments

The authors are grateful to Prof. Yoshihiko Ueda (Department of Pathology, Dokkyo Medical University Koshigaya Hospital) for his helpful advice. This study was supported by a Grant for the Strategic Research Base Development Program for Private Universities, which is subsidized by MEXT (2010). A part of this study was reported at the 54th Meeting of the Japanese Society of Histochemistry and Cytochemistry.

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Authors and Affiliations

  1. Division of Nephrology, Hypertension and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan

    Seiichiro Hemmi & Masayoshi Soma

  2. Kureha Special Laboratory Co., Ltd, Tokyo, Japan

    Natsuki Matsumoto

  3. Electron Microscopy Laboratory, Research Institute of Medical Science, Nihon University School of Medicine, Tokyo, Japan

    Toyoharu Jike

  4. Division of Pathology, Department of Biology and Pathology, Nihon University School of Medicine, 30-1 Kamichou, Oyaguchi, Itabashi-Ku, Tokyo, 173-8610, Japan

    Yukari Obana, Yoko Nakanishi & Akihiro Hemmi

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  1. Seiichiro Hemmi
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  2. Natsuki Matsumoto
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  3. Toyoharu Jike
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  4. Yukari Obana
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  6. Masayoshi Soma
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  7. Akihiro Hemmi
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Correspondence to Akihiro Hemmi.

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Hemmi, S., Matsumoto, N., Jike, T. et al. Proximal tubule morphology in rats with renal congestion: a study involving the in vivo cryotechnique. Med Mol Morphol 48, 92–103 (2015). https://doi.org/10.1007/s00795-014-0084-x

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  • DOI: https://doi.org/10.1007/s00795-014-0084-x

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