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Ultrastructural immunolocalization of telomerase and hyaluronate in migrating keratinocytes in a case of oro-pharyngeal squamous cancer.
Pathology, Research and Practice 2018 November 3
The ultrastructural immunolocalization of telomerase and hyaluronate has been studied in a case of oropharyngeal squamous carcinoma. Immunofluorescence shows that telomerase immunolabeling is present in the cytoplasm and in nuclei of some keratinocytes during their migration into the underlying connective tissue. The electron microscope shows that the nuclear localization of telomerase mainly occurs in the large nucleoli and in likely Cajal bodies, the sites of assembling and maturation of proteins forming the telomerase complex. Aside ribosomes, the nucleolus has a role in the biosynthesis of this reverse transcriptase during cell proliferation in normal tissues and in tumors. The cytoplasmic labeling for telomerase is frequently associated with an irregular network of keratin bundles but the significance of this observation is unclear. Hyaluronate, detected through ultrastructural immunolocalization of a hyaluronate binding protein, is abundant mostly along the cell membrane of the detaching basal keratinocytes during epithelial mesenchymal transition. A coat of hyaluronate surrounds the free keratinocytes of the squamous epithelium and is present around the connective cells present underneath. The study supports the hypothesis that hyaluronate forms a pathway along which epithelial cells can migrate during epidermal mesenchymal transition and may also shield cancer cells from immune cells.
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