Transcription factor SOX2 up-regulates stomach-specific pepsinogen A gene expression

  • Yasuyo Tani
  • Yoshimitsu Akiyama
  • Hiroshi Fukamachi
  • Kazuyoshi Yanagihara
  • Yasuhito Yuasa
Original Paper



Transcription factor SOX2 is expressed in normal gastric mucosae but not in the normal colon. We aimed to clarify the role of SOX2 with reference to pepsinogen expression in the gastrointestinal epithelium.


We analyzed expression of SOX2 and pepsinogens, differentiation markers of the stomach, in ten gastric cancer (GC) and ten colorectal cancer (CRC) cell lines. The effects of over-expression and down-regulation of SOX2 on pepsinogen expression were also examined.


Six GC and five CRC cell lines showed SOX2 expression on RT-PCR. Expression of pepsinogen A was detectable in eight GC and seven CRC cell lines, whereas the majority of the cell lines expressed pepsinogen C. Over-expression of SOX2 up-regulated expression of pepsinogen A but not that of pepsinogen C in 293T human embryonic kidney cells, and some GC and CRC cell lines. Moreover, pepsinogen A expression was significantly reduced by SOX2 RNA interference in two GC cell lines.


These data suggest that SOX2 plays an important role in regulation of pepsinogen A, and ectopic expression of SOX2 may be associated with abnormal differentiation of colorectal cancer cells.


SOX2 Pepsinogen A/C Gastric cancer Colorectal cancer Ectopic expression 



This work was supported in part by Grants-in-Aid for Scientific Research on Priority Areas from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Y.Y. and Y.A.). We also thank Ms. Hiromi Nagasaki and Dr. Artit Jinawath for their helpful suggestions.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Yasuyo Tani
    • 1
  • Yoshimitsu Akiyama
    • 1
  • Hiroshi Fukamachi
    • 1
  • Kazuyoshi Yanagihara
    • 2
  • Yasuhito Yuasa
    • 1
  1. 1.Department of Molecular Oncology, Graduate School of Medicine and DentistryTokyo Medical and Dental UniversityTokyoJapan
  2. 2.Central Animal LaboratoryNational Cancer Center Research InstituteTokyoJapan

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