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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1993 Aug;84(8):879–884. doi: 10.1111/j.1349-7006.1993.tb02061.x

Expression of Amphiregulin, a Novel Gene of the Epidermal Growth Factor Family, in Human Gastric Carcinomas

Yasuhiko Kitadai 1,2, Wataru Yasui 1, Hiroshi Yokozaki 1, Hiroki Kuniyasu 1, Ayse Ayhan 1, Ken Haruma 2, Goro Kajiyama 2, Gibbes R Johnson 3, Eiichi Tahara 1,✉
PMCID: PMC5919273  PMID: 8407551

Abstract

The expression of mRNA for amphiregulin (AR), a novel gene of the epidermal growth factor family, was examined in 8 human gastric carcinoma cell lines and 32 gastric carcinoma tissues as well as corresponding normal mucosa. Of the 8 gastric carcinoma cell lines, 7 expressed 1.4 kb AR mRNA at various levels. The expression of AR mRNA by TMK‐1 and MKN‐28 cells was increased by treatment with epidermal growth factor or transforming growth factor α. In surgical cases, all the gastric carcinoma tissues and their adjacent normal mucosa expressed AR mRNA. Interestingly, 20 (62.5%) out of 32 tumors expressed AR mRNA at higher levels than their corresponding normal mucosas (tumor/normal ≥1.2). No obvious correlation was observed between the AR mRNA levels and the histological types or tumor staging of gastric carcinoma. Immunohistochemically, AR protein was localized to the cytoplasm and/or nucleus in tumor cells. These results suggest that AR produced by tumor cells may be involved in the pathogenesis and/or progression of human gastric carcinoma.

Keywords: Amphiregulin, Gastric carcinoma, Growth factor

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