Abstract
Keratin 5 (K5) is a marker of basal progenitor cells in the epithelia of a number of organs. During prenatal development of the submandibular gland (SMG) in mice, K5+ progenitor cells in the developing epithelia play important roles in its organogenesis. Although K5+ cells are also present in the adult mouse SMG and may function in tissue regeneration, their histological localization has not yet investigated in detail. In the present study, we examined the immunohistochemical localization of K5 in the SMG in adult and postnatal developing mice. At birth, K5 immunoreactivity was detected in the entire duct system, in which it was localized in the basal cells of a double-layered epithelium, but was not detected in the terminal tubule or myoepithelial cells. At postnatal weeks 1–3, with the development of intercalated ducts (ID), striated ducts (SD), and excretory ducts (ED), K5-immunoreactive basal cells were gradually restricted to the ED and the proximal double-layered portions of the ID connecting to the SD. At the same time, K5 immunoreactivity appeared in myoepithelial cells, in which its positive ratio gradually increased. In adults, K5 immunoreactivity was localized to most myoepithelial cells, most basal cells in the ED, and a small number of ID cells at the boundary between the ID and SD in the female SMG or between the ID and granular convoluted tubules in the male SMG. These results suggest that K5 is a marker of differentiated myoepithelial cells and duct progenitor cells in the mouse SMG.
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Acknowledgments
The authors thank Mr. Shuichi Yamazaki for his technical assistance. This study was supported by Grants-in-Aid for Scientific Research # 20590187 and 26460270 from the Ministry of Education, Culture, Sports, Science and Technology of Japan to SI.
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Yamamoto, M., Nakata, H., Kumchantuek, T. et al. Immunohistochemical localization of keratin 5 in the submandibular gland in adult and postnatal developing mice. Histochem Cell Biol 145, 327–339 (2016). https://doi.org/10.1007/s00418-015-1392-5
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DOI: https://doi.org/10.1007/s00418-015-1392-5