Fine anionic iron colloid and its use in light and electron microscopic detection of cationic sites in the rat kidney

Aiji Ohtsuka, Takuro Murakami

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Ferric chloride, when boiled with ammonium thiocyanate, ammonia and caco- dylic acid, is converted into a fine anionic iron colloid which consists of 1-1.5 nm electron dense granules and gives a distinct Prussian blue reaction. This colloid allows light and electron microscopic detection of ionized cationic sites in tissues at a pH range of 4.0-9.0. Light and electron micrographs of the rat kidney stained with this colloid are demonstrated. These micrographs indicate that the foot processes of glomerular podocytes and the brush border of the proximal convoluted tubule contain positively-charged groups in their intracellular matrices, and that the foot process plasma membrane fronting the Bowman's capsular space has positively-charged groups. The latter finding, together with our previous study (MURAKAMI et al., 1986), suggests the co-existence of cationic and anionic sites on this foot process surface.

Original languageEnglish
Pages (from-to)543-552
Number of pages10
JournalArchivum histologicum japonicum
Issue number5
Publication statusPublished - Jan 1 1986


ASJC Scopus subject areas

  • Anatomy
  • Histology

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