Transgenic overexpression of Reg protein caused gastric cell proliferation and differentiation along parietal cell and chief cell lineages

Youichi Miyaoka, Yasunori Kadowaki, Shunji Ishihara, Takayuki Ose, Hiroyuki Fukuhara, Hideaki Kazumori, Shin Takasawa, Hiroshi Okamoto, Tsutomu Chiba, Yoshikazu Kinoshita

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Reg (regenerating gene product) was originally identified as a growth factor involved in pancreatic regeneration. During the healing course of gastric erosion, Reg expression is highly increased in the enterochromaffin-like (ECL) cells surrounding the ulcer crater, suggesting its role as a regulator of gastric mucosal regeneration. However, there has been no direct in vivo evidence of a growth-promoting role of Reg for the gastric mucosal cells. In the current study, Reg-transgenic mice were created and gastric mucosa were analysed for histological changes. Transgenic mice showed a marked increase in the thickness of the fundic mucosa. Anti-proliferating cell nuclear antigen (PCNA) staining of the fundic mucosa demonstrated the enlargement of the proliferating neck zone and the lower PCNA-negative zone. Histological analysis employing antibodies against cell-type markers revealed expansion of the chief cell and parietal cell populations and no change in the number of surface mucus-producing cells, ECL cells, or G cells. In conclusion, Reg has a growth-promoting effect on gastric progenitor cells and an activity to direct the differentiation of the cells into chief cell and parietal cell lineages. This was in contrast to other factors, all of which had been shown to drive differentiation towards mucus producing cells in vivo. In the injured gastric mucosa, Reg may play a unique and important part in the reconstruction of the properly organized mucosal architecture.

Original languageEnglish
Pages (from-to)3572-3579
Number of pages8
JournalOncogene
Volume23
Issue number20
DOIs
Publication statusPublished - 2004 Apr 29

Keywords

  • Gastric cells
  • Growth factor
  • Reg
  • Transgenic mice

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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