Abstract
Aquaporins (AQP) are a family of channel proteins expressed in the cell membranes of many tissue types. As water channels, they enable the selective permeation of water molecules and thus play an important role in water transport through the plasma membrane. There are numerous AQP sub-types, among which AQP5 is expressed in the salivary glands. The expression and localization of AQP5 in different salivary gland cells of animal models during fetal development and after birth have enabled the physiological functions of AQP5 to be elucidated, but subsequent changes in the adult phase are unknown. It is known that saliva production tends to decrease with age, but it is unclear how AQP5 activity and function changes developmentally, from young to old including gender differences. In the present study, we sampled the parotid, submandibular, and sublingual glands from young (8 weeks old) and aged (12 months old) mice of both sexes to study the effects of age- and sex-related differences in AQP5 expression. Positive fluorescence immunostaining was detected in the membranes of cells from all gland types, and this was enhanced in juvenile mice from both sexes. Western blot analyses revealed that AQP5 expression levels tended to decrease with age in both male and female animals. Conversely, AQP5 gene expression levels did not change significantly with aging, but were found to be high in submandibular gland cells of both sexes, in parotid gland cells of older female mice, and in the sublingual gland cells of young male mice.
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This study was supported in part by JSPS KAKENHI Numbers 16OH2684 and 18OH5386.
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Matsuyama, K., Fujikawa, K., Matsuki-Fukushima, M. et al. Ontogenetic development of the water channel protein AQP5 in mouse salivary gland tissue. Cell Tissue Res 392, 705–714 (2023). https://doi.org/10.1007/s00441-023-03762-w
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DOI: https://doi.org/10.1007/s00441-023-03762-w