Alteration of mucins in the submandibular gland during aging in mice

Archives of Oral Biology
Akihiko KameyamaKimi Yamakoshi

Abstract

Mucins are large glycosylated glycoproteins that are produced in the salivary glands, and their changes may contribute to the development of xerostomia due to aging and the accompanying deterioration of oral hygiene. This study aimed to characterize the changes in the mucins produced in submandibular gland (SMG) during the aging process. SMG mucins derived from mice of each age were separated using supported molecular matrix electrophoresis (SMME). Subsequently, the membranes were stained with Alcian blue (AB) or blotted with MAL-II lectin. The SMME membranes stained with AB were subjected to densitometric analysis and glycan analysis. The detailed structures of O-glycan were investigated by tandem mass spectrometry (MS/MS). The SMG of mice secreted three mucins with different glycan profiles: age-specific mucin, youth-specific mucin, and a mucin expressed throughout life, and the expression patterns of these mucins change during aging. Additionally, age-specific mucin began to be detected at about 12 months of age. A mucin expressed throughout life and age-specific mucin had the same mass of major glycans but different structures. Furthermore, the proportion of mucin glycan species expressed throughout life changed during the ...Continue Reading

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Apr 20, 2021·Journal of Dental Research·G B Proctor, A M Shaalan

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