Abstract
Amino acids have various physiological activities that influence processes such as intestinal regeneration, EGF secretion, protein synthesis, and cell growth. Salivary glands are exposed to nutrients that influence their proliferation and regeneration. Glycine is included in saliva in large quantities and reportedly has important roles in antibacterial activities and the inhibition of tumor growth and as a precursor of nucleotide synthesis in cell proliferation. We have investigated the effects of glycine on the proliferation and differentiation of salivary glands by using mouse salivary-gland-derived progenitor (mSGP) cells. In cultures of mSGP cells, cell proliferation is suppressed in the presence of glycine, whereas it is promoted by its removal. Glycine promotes three-dimensional formations of mSGP cells, which are negative for immature markers and positive for differentiation markers. In cell-cycle analysis, cell-cycle progression is delayed at the S-phase by glycine supplementation. Glycine also suppresses the phosphorylation of p42/p44MAPK. These results suggest that glycine suppresses the proliferation and promotes the differentiation of mSGP cells, and that it has inhibitory effects on growth factor signaling and cell-cycle progression. Glycine might therefore be a physiological activator that regulates the proliferation and differentiation of salivary glands.
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Acknowledgment
We thank AJINOMOTO for assistance with the supply of δ media and amino-acid-free medium, Yuichirou Hisatomi for assistance with the supply of mouse SGP cells, Tatsuko Kubo for assistance with the preparation of tissue for histology, and Kaede Yanagida and Dr. Kevin Boru for assistance with writing the manuscript.
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This work was supported in part by the Advanced Education Program for Integrated Clinical, Basic and Social Medicine, Graduate School of Medical Sciences, Kumamoto University (Support Program for Improving Graduate School Education, MEXT, Japan).
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Supplementary Fig. 1
Apoptosis analysis by flow cytometry. The number of cleaved-caspase positive cells and propidium ionide (PI) positive cells was determined by flow cytometry after treatment of mSGP cells with glycine. (a) PI positive cells (b) Cleaved-caspase positive cells. The number of both the cleaved-caspase positive cells and PI positive cells remained unaffected in either the presence or absence of glycine. (GIF 48.0 KB)
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Nakamura, Y., Matsumoto, S., Mochida, T. et al. Glycine regulates proliferation and differentiation of salivary-gland-derived progenitor cells. Cell Tissue Res 336, 203–212 (2009). https://doi.org/10.1007/s00441-009-0767-0
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DOI: https://doi.org/10.1007/s00441-009-0767-0