Abstract
The granular convoluted tubule of the mouse submandibular gland contains a wide variety of biologically active proteins, including several kallikreins. The tubule is under multihormonal regulation, and is sexually dimorphic, being larger in males than in females. Correspondingly, levels of its various protein secretory products are more abundant in males than in females. However, isoelectric focussing studies show that the true tissue kallikrein, mK1, is more abundant in the female than in the male submandibular gland. In this study, an antiserum was prepared with restricted immunoreactivity for mouse mK1, and possibly other kallikrein family members of low abundance in the mouse submandibular gland, and used for the immunocytochemical staining of the granular convoluted tubule cells in the submandibular gland of adult male and female mice, by indirect enzyme-labeled and immunogold-labeled antibody methods for light and electron microscopy, respectively. The distribution of immunoreactive tubule cells showed an unusual sexual dimorphism. In males only a few scattered slender tubule cells were strongly stained, while the more typical large tubule cells were only occasionally weakly positive, and many of them were not stained. By contrast, in females slender tubule cells were not seen, and about two thirds of the more typical tubule cells showed moderate to strong immunostaining. Immunoelectron microscopy revealed that immunostaining was confined to the secretion granules in granular convoluted tubule cells in both sexes. The slender tubule cells of males had many strongly stained small apical secretion granules and occasional basal infoldings; in the weakly positive larger more typical tubule cells not all secretion granules were positive, and there was intergranular variation in the intensity of staining of positive granules. In females, although more tubule cells were stained, intergranular variations in staining intensity were also noted. In both sexes, many tubule cells did not contain any secretion granules that showed immunogold labeling for kallikreins. These findings establish that, in contrast to the situation for the majority of granular convoluted tubules proteins, mK1 and possibly other minor kallikrein family members are more abundant in the granular convoluted tubules of female mice, and that there is considerable variation in the content of these kallikreins not only between different tubule cells, but also in individual secretion granules in any given tubule cell in either sex.
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Kurabuchi, S., Ta da, J., Gresik, E.W. et al. An Unusual Sexually Dimorphic Mosaic Distribution of a Subset of Kallikreins in the Granular Convoluted Tubule of the Mouse Submandibular Gland Detected by an Antibody with Restricted Immunoreactivity. Histochem J 31, 19–28 (1999). https://doi.org/10.1023/A:1003506302065
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DOI: https://doi.org/10.1023/A:1003506302065