Peroxisomes in sebaceous glands. IV. Aggregates of tubular peroxisomes in the mouse Meibomian gland

The Histochemical Journal
K Gorgas, A Völkl

Abstract

The occurrence of peroxisomes, their morphogenesis during the process of sebaceous transformation and their spatial relationship to the endoplasmic reticulum and lipid droplets were investigated by light and electron microscopy after visualization of the peroxidatic activity of catalase using an alkaline diaminobenzidine medium. The morphological alterations of peroxisomes display a characteristic sequence: During cellular differentiation, a remarkable proliferation of exclusively tubular, diaminobenzidine-reactive peroxisomes occurs. As maturation proceeds, an extensive elongation of tubular peroxisomes is seen. Concomitantly, they are densely packed in a regular, hexagonal arrangement and both the diameter and the catalase content gradually decreases. The most conspicuous feature of mature glandular cells are numerous highly organized aggregates of tubular, almost unstained peroxisomes with a diameter of 50 nm, arranged in a hexagonal pattern. They resemble adjacent tubular profiles of smooth endoplasmic reticulum. However, membrane continuities between these two compartments were never observed. During lethal disintegration peroxisomes subsequently decrease in number, probably by rapid sequestration within autophagolysosomes...Continue Reading

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