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Differential role of Wnt signaling and base excision repair pathways in gastric adenocarcinoma aggressiveness

Clinical and Experimental Medicine volume 17, pages 505–517 (2017)Cite this article

Abstract

Aberrant activation of Wnt and base excision repair (BER) signaling pathways are implicated in tumor progression and chemotherapy resistance in gastric adenocarcinoma. This study was conducted to clarify the role of E2F6 and RhoA, components of the Wnt signaling pathway, and SMUG1, a component of the BER pathway in gastric adenocarcinoma. Expression levels and clinicopathological significance of three biomarkers, namely E2F6, RhoA, and SMUG1, as potential signaling molecules involved in tumorigenesis and aggressive behavior, were examined using tissue microarray. Our analysis showed a relative increase in the expression of E2F6 in gastric adenocarcinoma with no lymph node metastasis (χ 2, P = 0.04 and OR, P = 0.08), while overexpression of RhoA and SMUG1 was found more often in the diffuse subtype of gastric adenocarcinoma as compared to the intestinal subtype (χ 2, P = 0.05, OR, P = 0.08 and χ 2, P = 0.001, OR, P = 0.009, respectively). Higher expression of RhoA was frequently seen in tumors with vascular invasion (χ 2, P = 0.01 and OR, P = 0.01). In addition, increased expression of SMUG1 was found more often in poorly differentiated tumors (χ 2, P = 0.01 and OR, P = 0.01). The distinct phenotype of E2F6Low/SMUG1High was more common in poorly differentiated tumors (P = 0.04) and with omental involvement (P = 0.01). The RhoAHigh/SMUG1High expression pattern was significantly more often found in diffuse subtype compared to the intestinal subtype (P = 0.001) as well as in poorly differentiated tumors (P = 0.004). The E2F6Low/SMUG1High and RhoAHigh/SMUG1High phenotypes can be considered as aggressive phenotypes of gastric adenocarcinoma. Our findings also demonstrated the synergistic effect of RhoA and SMUG1 in conferring tumor aggressiveness in diffuse subtype of gastric adenocarcinoma.

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Acknowledgements

This study was supported by Iran University of Medical Sciences [Project 94-04-126-26858 «Immunohistochemical expression of chemoresistant markers SMUG1, RhoA, and E2F6 in subtypes of Gastric cancer»].

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Affiliations

  1. Department of Molecular Medicine, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran

    Alireza Korourian & Zahra Madjd

  2. Oncopathology Research Center, Iran University of Medical Sciences (IUMS), Hemmat Street (Highway), Next to Milad Tower, Tehran, 14496-14530, Iran

    Raheleh Roudi, Ahmad Shariftabrizi, Elham Kalantari & Zahra Madjd

  3. Department of Nuclear Medicine and Molecular Imaging, State University of New York at Buffalo, Buffalo, NY, 14214, USA

    Ahmad Shariftabrizi

  4. Danesh Pathobiology Lab, Tehran, Iran

    Kambiz Sotoodeh

Authors
  1. Alireza Korourian
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  2. Raheleh Roudi
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  5. Kambiz Sotoodeh
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  6. Zahra Madjd
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Correspondence to Zahra Madjd.

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Korourian, A., Roudi, R., Shariftabrizi, A. et al. Differential role of Wnt signaling and base excision repair pathways in gastric adenocarcinoma aggressiveness. Clin Exp Med 17, 505–517 (2017). https://doi.org/10.1007/s10238-016-0443-0

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  • DOI: https://doi.org/10.1007/s10238-016-0443-0

Keywords

  • Gastric cancer
  • Wnt signaling pathway
  • Base excision repair
  • E2F6
  • RhoA
  • SMUG1