Abstract
Grandry corpuscles in the oral mucosa of the upper bill of the duck were immunohistochemically studied using antisera against calcitonin gene-related peptide (CGRP), galanin, methionine-enkephalin, neuropeptide Y (NPY), somatostatin, substance P (SP) and vasoactive intestinal peptide (VIP). Grandry corpuscles in the lamina propria selectively showed only SP-like immunoreactivity. Herbst corpuscles distributed near Grandry corpuscles were negative to all antisera applied. Although immunoreactive products in the Grandry corpuscles were found as granules in the peripheral cytoplasm of the Grandry cell, the axon terminals and satellite cells exhibited no reactivity. In pre-embedding electron-microscopic sections, SP-like immunoreactive products visualized with 3,3′-diaminobezidine were localized in the granules of Grandry cells, but no labeling was observed in the cytoplasmic matrix or cell organelles. Electron-immunocytochemical labeling with colloidal gold by the post-embedding method clearly demonstrated that the SP antigen was localized only in the granules. It is presumed that Grandry cells have a secretory function. However, the function and the method of release of the SP contained in the observed granules remains obscure. Some CGRP-, NPY-, SP- and VIP-like-immunoreactive nerve fibers with varicosities associated with blood vessels and nerve fiber bundles of various sizes were observed in the lamina propria, but no such fibers penetrated into the intraepitherial layer. Nerve fibers positive for SP and VIP were also found in the interlobular connective tissue of the palatine glands. Some SP-positive neurons were detected in the vicinity of the palatine glands.
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Kumamoto, K., Ebara, S., Fukuda, F. et al. Immunohistochemistry of Grandry corpuscles in the oral mucosa of the duck bill: a light- and electron-microscopic study. Cell Tissue Res 280, 253–258 (1995). https://doi.org/10.1007/BF00307796
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DOI: https://doi.org/10.1007/BF00307796