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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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      Affiliations
      [1 ] Division of Nephrology and Endocrinology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. akitojo-tky@umin.ac.jp.
      [2 ] Division of Nephrology and Endocrinology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
      [3 ] Laboratory of Electron Microscopy, The University of Tokyo, Tokyo, Japan.
      [4 ] Sakai Electron Microscope Application Laboratory, Saitama, Japan.
      Journal
      Med Mol Morphol
      Medical molecular morphology
      Springer Nature
      1860-1499
      1860-1499
      Jun 2017
      : 50
      : 2
      28314927 10.1007/s00795-016-0151-6 10.1007/s00795-016-0151-6

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