Synopsis
Catalase-positive rods of different dimensions, which frequently appeared crystalline by light microscopy, were found to be concentrated along with microbodies and cytoplasmic enzyme in the cells of the striated and extralobular excretory ducts of mouse salivary glands. When an entire mouse submandibular gland and its ducts were excised, fixed, sectioned and incubated for catalase demonstration, the excretory ducts were intensely stained relative to the remainder of the gland. Light microscopic examination of the stained ductal cells revealed particulate catalase in the form of rods and microbodies as well as reactivity due to non-particulate cytoplasmic enzyme. The cytoplasmic enzyme activity was less intense in some ductal epithelial cells (light cells) which were interspersed in mosaic arrangement among those more intensely stained (dark cells). The rods were somewhat more common in the light cells. Although the rods lack a symmetrical definitive crystal habit, their gross conformation and periodic substructure are reminiscent of crystalline catalase. No rods and relatively few peroxisomes were observed in excretory duct cells of germ-free mice although cytoplasmic catalase was abundant. These observations suggest that the catalase in salivary gland duct cells could be related in some way to the protection of the gland or the oral cavity or both against micro-organisms. Alternatively, the enzyme could be involved in the non-thyroidal biosynthesis of iodinated tyrosine derivatives.
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Hanker, J.S., Preece, J.W., Burkes, E.J. et al. Catalase in salivary gland striated and excretory duct cells. I. The distribution of cytoplasmic and particulate catalase and the presence of catalase-positive rods. Histochem J 9, 711–728 (1977). https://doi.org/10.1007/BF01003066
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DOI: https://doi.org/10.1007/BF01003066