Abstract
The persistent indiscriminate use of the term lipofuscin for the pigments encountered in pathological conditions, and which should be most properly termed ceroid pigments, is still creating unnecessary conceptual and nomenclature problems, and a great deal of confusion. While both the age-dependent lipofuscin and the pathologically formed ceroid pigments have somewhat similar physical and histochemical properties, sufficient differences to properly identify these two types of pigments are presented in this communication. In addition, because little is known on the saccharide components of lipofuscin and ceroid pigments in situ, we have in recent years explored the lectin binding characteristics of lipofuscin in human and rats, as well as in diverse ceroid pigments experimentally induced in rats. Our lectin histochemical results showed qualitative and quantitative differences in the saccharide composition between human cerebral neurolipofuscin and the intra and extracellular ceroid pigment of human atheromas, as well as, between rat lipofuscin and the ceroid pigments induced in these animals.
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