Activation of the ribosomal protein L13 gene in human gastrointestinal cancer

  • Authors:
    • Toshihisa Kobayashi
    • Yasushi Sasaki
    • Yuichiro Oshima
    • Hiroyuki Yamamoto
    • Hiroaki Mita
    • Hiromu Suzuki
    • Minoru Toyota
    • Takashi Tokino
    • Fumio Itoh
    • Kohzoh Imai
    • Yasuhisa Shinomura
  • View Affiliations

  • Published online on: July 1, 2006     https://doi.org/10.3892/ijmm.18.1.161
  • Pages: 161-170
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Abstract

Although ribosomal proteins are major components of ribosomes, recent data have shown them to have extra-ribosomal functions apart from ribosome and protein bio-synthesis. In our earlier study, we showed that ribosomal protein L13 mRNA was up-regulated in response to DNA damage in hamster cells. We report here that L13 expression is up-regulated in human gastrointestinal cancers. We also examined the biological role of L13 on human cancer cells. Knocking down L13 expression using small interfering RNA (siRNA) resulted in drastic attenuation of cancer cell growth with significant G1 and G2/M arrest of the cell cycle. More-over, L13 siRNA significantly enhanced the cellular sensitivity to certain DNA damaging agents and, concordantly, L13-overexpressing cells demonstrated greater chemoresistance compared to parent cells, suggesting an inverse correlation between L13 expression and chemosensitivity. By using semiquantitative RT-PCR, we analyzed expression of L13 in freshly resected cancer tissue of the stomach, colorectum and liver. Up-regulation of L13 mRNA expression was observed in10 (28%) of 36 gastric, 19 (41%) of 46 colorectal and 5 (20%) of 25 liver cancer tissue samples compared to adjacent normal tissue samples. We also found that increased expression of the L13 gene correlated with clinical staging in gastric cancers. The results of this study suggest that L13 plays an essential role in the progression of some gastrointestinal malignancies.

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July 2006
Volume 18 Issue 1

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

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Spandidos Publications style
Kobayashi T, Sasaki Y, Oshima Y, Yamamoto H, Mita H, Suzuki H, Toyota M, Tokino T, Itoh F, Imai K, Imai K, et al: Activation of the ribosomal protein L13 gene in human gastrointestinal cancer. Int J Mol Med 18: 161-170, 2006
APA
Kobayashi, T., Sasaki, Y., Oshima, Y., Yamamoto, H., Mita, H., Suzuki, H. ... Shinomura, Y. (2006). Activation of the ribosomal protein L13 gene in human gastrointestinal cancer. International Journal of Molecular Medicine, 18, 161-170. https://doi.org/10.3892/ijmm.18.1.161
MLA
Kobayashi, T., Sasaki, Y., Oshima, Y., Yamamoto, H., Mita, H., Suzuki, H., Toyota, M., Tokino, T., Itoh, F., Imai, K., Shinomura, Y."Activation of the ribosomal protein L13 gene in human gastrointestinal cancer". International Journal of Molecular Medicine 18.1 (2006): 161-170.
Chicago
Kobayashi, T., Sasaki, Y., Oshima, Y., Yamamoto, H., Mita, H., Suzuki, H., Toyota, M., Tokino, T., Itoh, F., Imai, K., Shinomura, Y."Activation of the ribosomal protein L13 gene in human gastrointestinal cancer". International Journal of Molecular Medicine 18, no. 1 (2006): 161-170. https://doi.org/10.3892/ijmm.18.1.161