Distinct behavior of claudin-3 and -4 around lactation period in mammary alveolus in mice |
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Authors: | Ken Kobayashi Haruto Kumura |
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Institution: | (1) Laboratory of Dairy Food Science, Research Faculty of Agriculture, Hokkaido University, North 9, West 9, Sapporo 060-8589, Japan |
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Abstract: | Tight junctions (TJs) are the most apical junctional complexes and restrict the fluid flux through the paracellular pathway.
In the mammary glands, the tightness of TJs occurs shortly after parturition to prevent the leakage of milk components from
the lumen and the loosening of TJs is induced immediately after weaning. Claudins are transmembrane proteins, and their composition
at the apical-most regions determines the permeability of TJs. In this study, we investigated the localization and expression
patterns of claudin-3 and -4 in the mammary glands around the lactation period because it is unclear how claudins construct
mammary TJs in the apical-most regions. Our results showed that claudin-3 and -4 change not only their level of expression
but also their localization in the processes of parturition, lactation, and weaning. Claudin-3 was concentrated in the apical-most
regions during lactation, whereas claudin-4 gradually decreased at the beginning of lactation and increased drastically immediately
after weaning. The qualitative change of claudin-3 was also identified by western blotting analysis as an additional band
around the lactation period. In addition, parts of the mammary epithelial cells showed intensive positive reactions to claudin-4
in the lateral membrane and cytoplasm after weaning, concurrently with the involution mammary glands. These results indicate
that claudin-3 in the apical-most regions maintains the impermeable TJs during lactation, and claudin-4 contributes to the
permeability changes of TJs immediately after parturition and weaning. |
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