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Enhanced podocyte vesicle transport in the nephrotic rat

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Abstract

Albumin endocytosis is enhanced in the podocytes of minimal change nephrotic syndrome. We investigated that the endocytic vesicle transport in the podocyte using three-dimensional observation in a rat model of puromycin aminonucleoside (PAN)-induced nephrotic syndrome. At day 7, Evans Blue-labeled albumin was intravenously injected in PAN rats, and one kidney was fixed for a morphological analysis; the other was used for the isolation of glomeruli through sieving and protein analyses. Evans Blue-labeled albumin was found to accumulate in an increased number of vesicles in the podocytes of PAN rat. Continuous sections and its three-dimensional observation demonstrated that vesicles may be transported from the cytoplasm to the apical membrane of the podocytes. The increased protein bands in the gel electrophoresis of the sieved glomeruli of nephrotic rats were analyzed by mass spectrometry in comparison to the control rats. The major proteins increased in the nephrotic rats were cytoplasmic dynein 1 heavy chain, myosin IX, and myosin VIIb. In conclusion, the podocyte endocytic vesicles carrying albumin increased with glomerular cytoplasmic dynein and myosin in minimal change nephrotic rats.

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Acknowledgements

This work was supported by a Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science to A.T. (C-23591214, C15K09285) to AT.

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Authors and Affiliations

  1. Division of Nephrology and Endocrinology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan

    Akihiro Tojo, Saaya Hatakeyama & Satoshi Kinugasa

  2. Laboratory of Electron Microscopy, The University of Tokyo, Tokyo, Japan

    Satoru Fukuda

  3. Sakai Electron Microscope Application Laboratory, Saitama, Japan

    Toshio Sakai

Authors
  1. Akihiro Tojo
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  2. Saaya Hatakeyama
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  3. Satoshi Kinugasa
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  4. Satoru Fukuda
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  5. Toshio Sakai
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Correspondence to Akihiro Tojo.

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The authors declare that no conflicts of interests were associated with this study.

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Tojo, A., Hatakeyama, S., Kinugasa, S. et al. Enhanced podocyte vesicle transport in the nephrotic rat. Med Mol Morphol 50, 86–93 (2017). https://doi.org/10.1007/s00795-016-0151-6

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  • DOI: https://doi.org/10.1007/s00795-016-0151-6

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