Regulation of myo-inositol biosynthesis by p53-ISYNA1 pathway

  • Authors:
    • Tomoyuki Koguchi
    • Chizu Tanikawa
    • Jinichi Mori
    • Yoshiyuki Kojima
    • Koichi Matsuda
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  • Published online on: March 24, 2016     https://doi.org/10.3892/ijo.2016.3456
  • Pages: 2415-2424
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Abstract

In response to various cellular stresses, p53 exerts its tumor suppressive effects such as apoptosis, cell cycle arrest, and senescence through the induction of its target genes. Recently, p53 was shown to control cellular homeostasis by regulating energy metabolism, glycolysis, antioxidant effect, and autophagy. However, its function in inositol synthesis was not reported. Through a microarray screening, we found that five genes related with myo-inositol metabolism were induced by p53. DNA damage enhanced intracellular myo-inositol content in HCT116 p53+/+ cells, but not in HCT116 p53-/- cells. We also indicated that inositol 3-phosphate synthase (ISYNA1) which encodes an enzyme essential for myo-inositol biosynthesis as a direct target of p53. Activated p53 regulated ISYNA1 expression through p53 response element in the seventh exon. Ectopic ISYNA1 expression increased myo-inositol levels in the cells and suppressed tumor cell growth. Knockdown of ISYNA1 caused resistance to adriamycin treatment, demonstrating the role of ISYNA1 in p53-mediated growth suppression. Furthermore, ISYNA1 expression was significantly associated with p53 mutation in bladder, breast cancer, head and neck squamous cell carcinoma, lung squamous cell carcinoma, and pancreatic adenocarcinoma. Our findings revealed a novel role of p53 in myo-inositol biosynthesis which could be a potential therapeutic target.
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June-2016
Volume 48 Issue 6

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Koguchi T, Tanikawa C, Mori J, Kojima Y and Matsuda K: Regulation of myo-inositol biosynthesis by p53-ISYNA1 pathway. Int J Oncol 48: 2415-2424, 2016.
APA
Koguchi, T., Tanikawa, C., Mori, J., Kojima, Y., & Matsuda, K. (2016). Regulation of myo-inositol biosynthesis by p53-ISYNA1 pathway. International Journal of Oncology, 48, 2415-2424. https://doi.org/10.3892/ijo.2016.3456
MLA
Koguchi, T., Tanikawa, C., Mori, J., Kojima, Y., Matsuda, K."Regulation of myo-inositol biosynthesis by p53-ISYNA1 pathway". International Journal of Oncology 48.6 (2016): 2415-2424.
Chicago
Koguchi, T., Tanikawa, C., Mori, J., Kojima, Y., Matsuda, K."Regulation of myo-inositol biosynthesis by p53-ISYNA1 pathway". International Journal of Oncology 48, no. 6 (2016): 2415-2424. https://doi.org/10.3892/ijo.2016.3456