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American Journal of Pathology, Vol 129, 295-301, Copyright © 1987 by American Society for Investigative Pathology

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Histochemical detection of lipid peroxidation in the liver of bromobenzene-poisoned mice

A Pompella, E Maellaro, AF Casini and M Comporti
Istituto di Patologia Generale dell'Universita di Siena, Italy.

The possibility of detecting lipid peroxidation histochemically was investigated in liver tissue in vivo, in conditions in which the process has been demonstrated by biochemical methods. The technique was based on the detection of aldehyde functions with the use of the Schiff's reagent. The study was carried out on bromobenzene-intoxicated mice, which generally exhibit levels of lipid peroxidation considerably higher than those observed in the case of other hepatotoxins. Liver sections from control animals were unstainable by the reagent, while sections from bromobenzene-poisoned mice showed a purple stain of various intensity, unhomogeneously distributed, sometimes with a mediolobular localization. Microphotometric measurements were performed at 565 nm by means of a computer-controlled microscope photometer. The ratios of Schiff-positive area relative to total section area, as well as the total extinctions referred to 100 sq mu of the sections, showed a high correlation with the corresponding hepatic contents of malonic dialdehyde, chosen as biochemical index of lipid peroxidation. In vitro studies in which liver sections were incubated in the presence of NADPH- Fe2+, showed a Schiff positivity which increased with the incubation time, confirming the reliability of the histochemical method. Another procedure, based on the use of 2-OH-3-naphtoic acid hydrazide coupled with fast blue B, was also developed and proved to be possibly more sensitive than Schiff's reagent in the detection of lipid peroxidation in liver tissue.

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