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Light microscopic visualization of the reaction product of cerium used for localization of peroxisomal oxidases

S Angermuller and HD Fahimi

Department of Anatomy, University of Heidelberg, Federal Republic of Germany.

The reaction product of cerium used for localization of peroxisomal oxidases is highly electron-dense but lacks sufficient contrast at the light microscopic level. We describe two methods for converting the reaction product of cerium to colored compounds visible by light microscopy. The first method is based on 3,3'-diaminobenzidine (DAB) amplification of transition metal compounds, of which cerium is one. Sections of glutaraldehyde-fixed rat liver or kidney are incubated first in media for various oxidases containing CeCl3, followed by treatment with DAB in Na acetate buffer, pH 5.3. To prevent any interference by the peroxidatic activity of catalase, NaN3 or Na pyruvate is added to the DAB amplification medium. Staining with DAB can be further intensified with NiCl2 or CoCl2. The second method is based on the conversion of the cerium reaction product with alkaline lead citrate and the final visualization of the lead compound with ammonium sulfide. These methods allow the evaluation of large sections for peroxisomal oxidases by light microscopy, making close correlation between light and electron microscopy possible.

Volume 36, Issue 1, pp. 23-28, 01/01/1988
Copyright © 1988 by The Histochemical Society


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