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Glycobiology Advance Access originally published online on January 3, 2003
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Glycobiology, 2003, Vol. 13, No. 5 363-366
© 2003 Oxford University Press

Distinct localization of MUC5B glycoforms in the human salivary glands

E.C.I. Veerman1,3, P.A.M. van den Keijbus3, K. Nazmi3, W. Vos4, J.E. van der Wal2,4, E. Bloemena4, J.G.M. Bolscher3 and A.V. Nieuw Amerongen3

3 Department of Dental Basic Sciences, Section of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (acta), Vrije Universiteit, Van Der Boechorststraat 7, 1081 Bt Amsterdam, the Netherlands
4 Department of Pathology, VUMC, De Boelelaan 1107, 1084 HV Amsterdam, The Netherlands

Received on September 25, 2002; revised on November 19, 2002; accepted on December 4, 2002

Salivary mucins, encoded by the MUC5B gene, make up a heterogeneous family of molecules, which are secreted by several glands, including the submandibular, sublingual, and palatine glands. Previous studies have shown that heterogeneity in the salivary mucin population is related to its multiglandular origin. In the present study we address the question to what extent the mucin (MUC5B) population from a single human salivary gland is made up of different glycoforms. Using monoclonal antibodies to defined protein and sulfated carbohydrate epitopes specific to MUC5B, we conduct an immunohistochemical study of different salivary gland types, including submandibular, sublingual, and labial glands. In all tissues studied we found a mosaic expression pattern of sulfo-Lewis a antigen, recognized by mAb F2, which in salivary glands is exclusively present on MUC5B. On the other hand, mucous acini were uniformly labeled by mAb EU-MUC5Bb, evoked against a peptide-stretch of the tandem repeat region of MUC5B. Double staining with both antibodies confirmed the presence of MUC5B-positive/sulfo-Lewis a-positive cells, as well as MUC5B-positive/sulfo-Lewis a-negative cells within one glandular unit. These results indicate that one and the same salivary gland synthesizes different MUC5B glycoforms.

2 Present address: Department of Pathology, University Hospital Groningen, P.O. Box 30.001, 9700 RB Groningen, The Netherlands

1 To whom correspondence should be addressed; e-mail: eci.veerman.obc.acta{at}med.vu.nl


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