Differential regulation of the biosynthesis of glucose transporters by the PI3-K and MAPK pathways of insulin signaling by treatment with novel compounds from Liriope platyphylla

  • Authors:
    • Yoen Kyung Lee
    • Ji Eun Kim
    • So Hee Nam
    • Jun Seo Goo
    • Sun Il Choi
    • Young Hwan Choi
    • Chang Jun Bae
    • Jong Min Woo
    • Jung Sik Cho
    • Dae Youn Hwang
  • View Affiliations

  • Published online on: December 14, 2010     https://doi.org/10.3892/ijmm.2010.581
  • Pages: 319-327
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Abstract

The insulin signaling pathway, involving protein kinase B (PKB) and mitogen-activated protein kinase (MAPK), mediates the biological response to insulin and several growth factors and cytokines. To investigate the correlation between glucose transporter (Glut) biosynthesis and the insulin signaling pathway activated by novel compounds of Liriope platyphylla (LP9M80-H), alterations in Glut and key protein expression in the insulin signaling pathway were analyzed in the liver and brain of ICR mice treated with LP9M80-H. An in vitro assay showed that the highest level of insulin concentration was observed in the LP9M80-H-treated group, followed by the LP-H, LP-M, LP-E, and LP9M80-C-treated groups. Therefore, LP9M80-H was selected for use in studying the detailed mechanism of the insulin signaling pathway in animal systems. In an in vivo experiment, LP9M80-H induced a significant increase in glucose levels and a decrease of insulin concentration in the blood of mice, while their body weight remained constant over 5 days. The expression level of Glut-3 was down-regulated in the liver, or maintained at the same level in the brain of LP9MH80-H-treated mice. These changes corresponded to the phosphorylation of the p38 protein rather than to ERK and JNK in the MAPK signaling pathway. In addition, the expression level of Glut-1 increased significantly after LP9MH80-H treatment of both insulin target tissues in mice. Western blot analysis showed that Akt in the PI3-K pathway mainly participated in Glut-1 biosynthesis. Thus, these results suggest the possibility that the LP9M80-H-induced regulation of Glut-1 and Glut-3 biosynthesis may be mediated by the Akt and p38 MAPK signaling of the insulin signaling pathway in the liver and brain of mice.

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March 2011
Volume 27 Issue 3

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

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Spandidos Publications style
Lee YK, Kim JE, Nam SH, Goo JS, Choi SI, Choi YH, Bae CJ, Woo JM, Cho JS, Hwang DY, Hwang DY, et al: Differential regulation of the biosynthesis of glucose transporters by the PI3-K and MAPK pathways of insulin signaling by treatment with novel compounds from Liriope platyphylla. Int J Mol Med 27: 319-327, 2011
APA
Lee, Y.K., Kim, J.E., Nam, S.H., Goo, J.S., Choi, S.I., Choi, Y.H. ... Hwang, D.Y. (2011). Differential regulation of the biosynthesis of glucose transporters by the PI3-K and MAPK pathways of insulin signaling by treatment with novel compounds from Liriope platyphylla. International Journal of Molecular Medicine, 27, 319-327. https://doi.org/10.3892/ijmm.2010.581
MLA
Lee, Y. K., Kim, J. E., Nam, S. H., Goo, J. S., Choi, S. I., Choi, Y. H., Bae, C. J., Woo, J. M., Cho, J. S., Hwang, D. Y."Differential regulation of the biosynthesis of glucose transporters by the PI3-K and MAPK pathways of insulin signaling by treatment with novel compounds from Liriope platyphylla". International Journal of Molecular Medicine 27.3 (2011): 319-327.
Chicago
Lee, Y. K., Kim, J. E., Nam, S. H., Goo, J. S., Choi, S. I., Choi, Y. H., Bae, C. J., Woo, J. M., Cho, J. S., Hwang, D. Y."Differential regulation of the biosynthesis of glucose transporters by the PI3-K and MAPK pathways of insulin signaling by treatment with novel compounds from Liriope platyphylla". International Journal of Molecular Medicine 27, no. 3 (2011): 319-327. https://doi.org/10.3892/ijmm.2010.581