Downregulation of regenerating islet-derived 3 alpha (REG3A) in primary human gastric adenocarcinomas

Bongkun Choi, Yousin Suh, Woo Ho Kim, Laurence Christa, Joobae Park, Chang Dae Bae

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Gastric carcinoma is considered to be one of the most prevalent cancers worldwide. We have performed differential-display polymerase chain reaction (DD-PCR) in order to compare the gene expression profile of gastric carcinoma and that of a normal stomach, in an attempt to identifiy differentially expressed genes associated with primary human gastric cancers. One of the down-regulated genes in gastric cancers was identified as regenerating islet-derived 3 alpha (REG3A), also known as hepatocarcinoma-intestine-pancreas/ pancreatitis-associated protein (HIP/PAP). REG3A exhibited relatively high expression levels in normal gastric mucosa. However, REG3A was found to be down-regulated in 67% (20 out of 30 samples) of primary human gastric cancers, as determined by RT-PCR. In addition, REG3A mRNA expression was not detected in stomach cancer cell lines, SNU cells. Immunohistochemical analysis further confirmed the down-regulation of REG3A expression in primary human gastric cancers. Treatment with the demethylating agent, 5-aza-2′-deoxycytidine (5-Aza-dC) resulted in the restoration of REG3A mRNA expression in the gastric cancer cell line, indicating that the transcriptional silencing of REG3A in SNU cell lines was caused by DNA methylation. Taken together, these data indicate that REG3A is down-regulated in most primary human gastric cancer cells, and might be useful in the diagnosis of gastric cancer. Further characterization of the differentially expressed gene, REG3A, should lead to a better understanding of the changes occurring at the molecular level during the development and progression of primary human gastric cancer.

Original languageEnglish (US)
Pages (from-to)796-804
Number of pages9
JournalExperimental and Molecular Medicine
Volume39
Issue number6
StatePublished - Dec 31 2007
Externally publishedYes

Fingerprint

Stomach Neoplasms
Stomach
Adenocarcinoma
Down-Regulation
Cells
Genes
decitabine
Messenger RNA
Polymerase chain reaction
Gene expression
Restoration
Cell Line
Display devices
Carcinoma
Polymerase Chain Reaction
DNA Methylation
Gastric Mucosa
Transcriptome
Intestines
Pancreas

Keywords

  • DNA methylation
  • Gene expression profiling
  • Gene expression regulation, neoplastic
  • Pancreatitis-associated protein
  • Reg3a protein
  • Stomach neoplasms

ASJC Scopus subject areas

  • Biochemistry
  • Genetics

Cite this

Downregulation of regenerating islet-derived 3 alpha (REG3A) in primary human gastric adenocarcinomas. / Choi, Bongkun; Suh, Yousin; Kim, Woo Ho; Christa, Laurence; Park, Joobae; Bae, Chang Dae.

In: Experimental and Molecular Medicine, Vol. 39, No. 6, 31.12.2007, p. 796-804.

Research output: Contribution to journalArticle

Choi, Bongkun ; Suh, Yousin ; Kim, Woo Ho ; Christa, Laurence ; Park, Joobae ; Bae, Chang Dae. / Downregulation of regenerating islet-derived 3 alpha (REG3A) in primary human gastric adenocarcinomas. In: Experimental and Molecular Medicine. 2007 ; Vol. 39, No. 6. pp. 796-804.
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