Abstract
Carnoy-fixed paraffin sections of the brain white matter of 5–45-day-old Wistar rats were stained with Fast Green FCF, pH 2.6. for acidic (anionic) proteins or with heparin-Alcian Blue for basic (cationic) proteins. Both the histochemical colour reactions for the proteins were found to be specific and to obey the Bouger-Lambert-Beer's law. Cytospectrophotometric determinations have shown that within the period between the 5th and 8th day after birth, the content both of acidic and of basic proteins per cell in the astrocytes and oligodendrogliocytes of rat corpus callosum is markedly increased. In the course of subsequent postnatal development, the protein content in the neuroglial cell decreased, this decrease being steeper for the basic proteins than for the acidic ones. Based on these cytospectrophotometric results, as well as on previous autoradiographic data, a suggestion is put forward concerning two successive subpopulations of glial cells in the rat brain in the course of early postnatal development.
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