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Inflammation Research

, Volume 57, Issue 12, pp 593–600 | Cite as

Tubular epithelial cells have the capacity to transdifferentiate into CD68-positive macrophage-like cells by oxidative stress

  • M. Tanaka
  • Y. Suzuki
  • I. Shirato
  • H. Takahara
  • T. Shibata
  • T. Sugaya
  • K. Shimamoto
  • S. Horikoshi
  • Y. Tomino
Article

Abstract.

Objective:

The present study was intended to assess transdifferentiation from tubular epithelial cells to macrophage- like cells.

Methods:

Puromycin aminonucleoside nephrotic rats were sacrificed at days 4, 8, 24 and 112. We immunohistochemically evaluated CD68, CD163, and cytokeratin AE1/AE3, known as markers for macrophages and tubular epithelial cells. Nitrotyrosine, gp91phox and Rac 1 expressions was also analyzed. CD68 expression in cultured murine proximal tubular epithelial cells (mProx) stimulated by crude and pure BSA was examined by flow cytometry and immunofluorescence.

Results:

The tubular CD68-positive cells were observed on day 112. Immunoelectronmicroscopy revealed that some CD68-positive cells showed brush borders on the cell membrane and some of cytokeratin-positive tubular cells also expressed CD163 in mirror sections. The tubular CD68-positive cells were also positive for nitrotyrosine, gp91 phox and Rac 1. They contained lipid in their cytoplasm. Crude BSA, containing free fatty acid, induced CD68 expression in a dose- and time-dependent manner in mProx, but not pure BSA. The surface expression of CD68 was increased by high dose and long term stimulation with crude BSA as shown by immunofluorescence.

Conclusions:

We confirmed that tubular epithelial cells have the capacity to transdifferentiate to CD68-positive macrophage-like cells, which may be linked to oxidative stress.

Keywords:

Tubular epithelial cells Transdifferentiation CD68-positive macrophage-like cells Oxdative stress Free fatty acid 

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Copyright information

© Birkhaueser 2008

Authors and Affiliations

  • M. Tanaka
    • 1
    • 2
  • Y. Suzuki
    • 1
  • I. Shirato
    • 1
  • H. Takahara
    • 1
  • T. Shibata
    • 1
  • T. Sugaya
    • 1
  • K. Shimamoto
    • 2
  • S. Horikoshi
    • 1
  • Y. Tomino
    • 1
  1. 1.Division of NephrologyDepartment of Internal Medicine, Juntendo University School of MedicineBunkyo-ku, TokyoJapan
  2. 2.2nd Department of Internal MedicineSapporo Medical University, School of MedicineSapporoJapan

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