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Tumor Biology

, Volume 35, Issue 4, pp 3447–3453 | Cite as

Reduced mRNA expression levels of MBD2 and MBD3 in gastric carcinogenesis

  • Thaís Brilhante Pontes
  • Elizabeth Suchi Chen
  • Carolina Oliveira Gigek
  • Danielle Queiroz Calcagno
  • Fernanda Wisnieski
  • Mariana Ferreira Leal
  • Samia Demachki
  • Paulo Pimentel Assumpção
  • Ricardo Artigiani
  • Laércio Gomes Lourenço
  • Rommel Rodriguez Burbano
  • Marília Arruda Cardoso SmithEmail author
Research Article

Abstract

Aberrant methylation has been reported in several neoplasias, including gastric cancer. The methyl-CpG-binding domain (MBD) family proteins have been implicated in the chromatin remodeling process, leading to the modulation of gene expression. To evaluate the role of MBD2 and MBD3 in gastric carcinogenesis and the possible association with clinicopathological characteristics, we assessed the mRNA levels and promoter methylation patterns in gastric tissues. In this study, MBD2 and MBD3 mRNA levels were determined by RT-qPCR in 28 neoplastic and adjacent nonneoplastic and 27 gastritis and non-gastritis samples. The promoter methylation status was determined by bisulfite sequencing, and we found reduced MBD2 and MBD3 levels in the neoplastic samples compared with the other groups. Moreover, a strong correlation between the MBD2 and MBD3 expression levels was observed in each set of paired samples. Our data also showed that the neoplastic tissues exhibited higher MBD2 promoter methylation than the other groups. Interestingly, the non-gastritis group was the only one with positive methylation in the MBD3 promoter region. Furthermore, a weak correlation between gene expression and methylation was observed. Therefore, our data suggest that DNA methylation plays a minor role in the regulation of MBD2 and MBD3 expression, and the presence of methylation at CpGs that interact with transcription factor complexes might also be involved in the modulation of these genes. Moreover, reduced mRNA expression of MBD2 and MBD3 is implicated in gastric carcinogenesis, and thus, further investigations about these genes should be conducted for a better understanding of the role of abnormal methylation involved in this neoplasia.

Keywords

Methyl-binding domain proteins Gastric cancer DNA methylation Gene expression 

Notes

Acknowledgments

This research was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil), Coordenadoria de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES, Brazil), and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Brazil).

Conflict of interests

None

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2013

Authors and Affiliations

  • Thaís Brilhante Pontes
    • 1
  • Elizabeth Suchi Chen
    • 1
  • Carolina Oliveira Gigek
    • 1
  • Danielle Queiroz Calcagno
    • 1
  • Fernanda Wisnieski
    • 1
  • Mariana Ferreira Leal
    • 1
  • Samia Demachki
    • 2
  • Paulo Pimentel Assumpção
    • 3
  • Ricardo Artigiani
    • 4
  • Laércio Gomes Lourenço
    • 5
  • Rommel Rodriguez Burbano
    • 6
  • Marília Arruda Cardoso Smith
    • 1
    Email author
  1. 1.Disciplina de Genética, Departamento de Morfologia e GenéticaUniversidade Federal de São PauloSão PauloBrazil
  2. 2.Serviço de Patologia, Hospital Universitário João de Barros BarretoUniversidade Federal do ParáBelémBrazil
  3. 3.Serviço de Cirurgia, Hospital Universitário João de Barros BarretoUniversidade Federal do ParáBelémBrazil
  4. 4.Departamento de PatologiaUniversidade Federal de São PauloSão PauloBrazil
  5. 5.Disciplina de Gastroenterologia Cirúrgica, Departamento de CirurgiaUniversidade Federal de São PauloSão PauloBrazil
  6. 6.Laboratório de Citogenética Humana, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémBrazil

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