Apical tubular network in the rat kidney proximal tubule cells studied by thick-section and scanning electron microscopy

被引:0
作者
Tanenori Hatae
Takao Ichimura
Tetsuya Ishida
Takanobu Sakurai
机构
[1] Department of Anatomy,
[2] Kagawa Medical School,undefined
[3] Miki,undefined
[4] Kagawa,undefined
[5] 761-07 Japan,undefined
来源
Cell and Tissue Research | 1997年 / 288卷
关键词
Key words: Kidney (proximal tubule); Apical tubule; Endosome; Ultrastructure; Endocytosis; Membrane recycling; Rat (Wistar);
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摘要
The apical cytoplasm of several absorbing epithelia contains well-developed apical tubules (AT) which contribute to membrane recycling from endocytic vacuoles to the apical cell membrane. In this study, we examined three-dimensional structures of the AT in rat kidney proximal tubule cells by transmission and scanning electron microscopy. In thin sections, the AT appeared as straight tubules with a rather constant diameter (70–90 nm), but others were curved and, occasionally, branching. No AT were labeled with the marker for the external cell surface (ruthenium red) or exhibited histochemical enzyme activity for lysosomal hydrolase (acid phosphatase). After intravenous injection of horseradish peroxidase, it was absorbed in the kidney proximal tubule cells and the AT were labeled with HRP reaction products. Stereo-viewing of the labeled AT in thick sections revealed that they formed an interconnected tubular network. Scanning electron microscopy allowed a three-dimensional view of the AT, in which a network of branching and anastomosing tubules was revealed. These observations indicate that the AT are intracellular endosomal compartments which form an extensive tubular network in the apical cytoplasm. The possibility that this apical tubular network serves as a large membrane store for membrane recycling is discussed.
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页码:317 / 325
页数:8
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