Abstract
The aim of the present study was to determine the possible expression of the mucin MUC16 in the lacrimal apparatus. Expression and distribution of MUC16 in lacrimal gland, accessory lacrimal glands, and nasolacrimal ducts was monitored by RT-PCR and immunohistochemistry. MUC16 was expressed and detected in all tissues investigated. Comparable to conjunctiva and cornea it was membrane-anchored in accessory lacrimal glands whereas in lacrimal gland acinar cells and columnar cells of the nasolacrimal ducts it was stored in intracytoplasmic vesicles without membrane-association. Subepithelial serous glands of the nasolacrimal ducts revealed staining of the secretion product. Intracelluar production of MUC16 is present in lacrimal gland and epithelial cells of the nasolacrimal ducts but it is not clear whether this MUC16 is secreted. MUC16 seems to be shedded or secreted from the epithelial surface of subepithelial serous glands of the nasolacrimal ducts. Our results show that MUC16 is present in the whole lacrimal apparatus. Its distribution pattern suggests different physiological functions with regard to tear film physiology and tear outflow. Moreover, the results demonstrate the existence of so far not recognized qualitative differences in the secretion product of main lacrimal gland and accessory lacrimal glands (glands of Krause).
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Acknowledgments
The authors thank Ute Beyer and Michaela Risch for expert technical assistance as well as Monica Berry, Academic Unit of Ophthalmology, University of Bristol, UK for her critical suggestions. Supported in part by the Deutsche Forschungs-gemeinschaft (DFG)—program grants PA 738/9-1 and PA 738/1-5, the BMBF—Wilhelm Roux Program, Halle, Germany—program grants FKZ 9/18, 12/08, and 13/08, as well as Sicca Forschungsförderung of Association of German Ophthalmologists.
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Jäger, K., Wu, G., Sel, S. et al. MUC16 in the lacrimal apparatus. Histochem Cell Biol 127, 433–438 (2007). https://doi.org/10.1007/s00418-006-0246-6
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DOI: https://doi.org/10.1007/s00418-006-0246-6