Summary
With the marker of Paneth cells-lysozyme, secretory component (SC) immunoreactivity was demonstrated exclusively in Paneth cells of rat small intestine. The other types of epithelial cells (columnar, goblet, endocrine) were negative. On electron microscopic level, many SC-positive colloidal gold particles were found in rough endoplasmic reticulum, Golgi complexes, basal membrane and secretory granules of Paneth cells. These results suggest that SC is not a component of ingested immune complex, but a membrane receptor on Paneth cell. It may function as receptor for polymeric IgA and mediate its transport across the mucosal epithelium. Thus, Paneth cells are responsible for SC synthesis and participate in IgA-mediated acquired immunity in rat small intestine.
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Acknowledgements
We are greatly indebted to Ms. Kang ZM and Mrs. Yan YB for excellent technical assistance. This study was supported by fund for young scholars from Second Military Medical University (P. R. China).
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Tang, QJ., Tao, KZ., Yun-Liu et al. Immunocytochemical localization of secretory component in Paneth cell secretory granules-rat Paneth cells participate in acquired immunity. J Mol Hist 36, 331–335 (2005). https://doi.org/10.1007/s10735-005-9003-8
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DOI: https://doi.org/10.1007/s10735-005-9003-8