Expression of glucagon-like peptide-1 receptor and glucose‑dependent insulinotropic polypeptide receptor is regulated by the glucose concentration in mouse osteoblastic MC3T3-E1 cells

  • Authors:
    • Emina Aoyama
    • Ippei Watari
    • Katarzyna Anna Podyma-Inoue
    • Masaki Yanagishita
    • Takashi Ono
  • View Affiliations

  • Published online on: May 27, 2014     https://doi.org/10.3892/ijmm.2014.1787
  • Pages: 475-482
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Abstract

Glucose-dependent insulinotropic polypeptide receptor (GIPR) and glucagon-like peptide-1 receptor (GLP‑1R) are incretin receptors that play important roles in regulating insulin secretion from pancreatic β cells. Incretin receptors are also thought to play a potential role in bone metabolism. Osteoblasts in animals and humans express GIPR; however, the presence of GLP-1R in these cells has not been reported to date. Thus, the aim of this study was to determine whether GLP-1R and GIPR are expressed in osteoblastic cells, and whether their expression levels are regulated by the extracellular glucose concentration. Mouse osteoblastic MC3T3-E1 cells were cultured in medium containing normal (5.6 mM) or high (10, 20 or 30 mM) glucose concentrations, with or without bone morphogenetic protein-2 (BMP-2). RT-PCR, western blot analysis and immunofluorescence were carried out to determine GIPR and GLP-1R mRNA and protein expression levels. Cell proliferation was also assessed. The GLP-1R and GIPR mRNA expression levels were higher in the MC3T3-E1 cells cultured in medium containing high glucose concentrations with BMP-2 compared with the cells cultured in medium containing normal glucose concentrations with or without BMP-2. GLP-1R protein expression increased following culture in high-glucose medium with BMP-2 compared with culture under normal glucose conditions. However, the cellular localization of GLP-1R was not affected by either glucose or BMP-2. In conclusion, our data demonstrate that the expression of GLP-1R and GIPR is regulated by glucose concentrations in MC3T3-E1 cells undergoing differentiation induced by BMP-2. Our results reveal the potential role of incretins in bone metabolism.
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August-2014
Volume 34 Issue 2

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Aoyama E, Watari I, Podyma-Inoue KA, Yanagishita M and Ono T: Expression of glucagon-like peptide-1 receptor and glucose‑dependent insulinotropic polypeptide receptor is regulated by the glucose concentration in mouse osteoblastic MC3T3-E1 cells. Int J Mol Med 34: 475-482, 2014.
APA
Aoyama, E., Watari, I., Podyma-Inoue, K.A., Yanagishita, M., & Ono, T. (2014). Expression of glucagon-like peptide-1 receptor and glucose‑dependent insulinotropic polypeptide receptor is regulated by the glucose concentration in mouse osteoblastic MC3T3-E1 cells. International Journal of Molecular Medicine, 34, 475-482. https://doi.org/10.3892/ijmm.2014.1787
MLA
Aoyama, E., Watari, I., Podyma-Inoue, K. A., Yanagishita, M., Ono, T."Expression of glucagon-like peptide-1 receptor and glucose‑dependent insulinotropic polypeptide receptor is regulated by the glucose concentration in mouse osteoblastic MC3T3-E1 cells". International Journal of Molecular Medicine 34.2 (2014): 475-482.
Chicago
Aoyama, E., Watari, I., Podyma-Inoue, K. A., Yanagishita, M., Ono, T."Expression of glucagon-like peptide-1 receptor and glucose‑dependent insulinotropic polypeptide receptor is regulated by the glucose concentration in mouse osteoblastic MC3T3-E1 cells". International Journal of Molecular Medicine 34, no. 2 (2014): 475-482. https://doi.org/10.3892/ijmm.2014.1787