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(American Journal of Pathology. 1998;153:263-269.)
© 1998 American Society for Investigative Pathology

Regular Articles

Comparative Phenotypic Studies of Duct Epithelial Cell Lines Derived from Normal Human Pancreas and Pancreatic Carcinoma

Ni Liu* , Toru Furukawa , Masao Kobari and Ming-Sound Tsao*§

From the Division of Cellular and Molecular Biology,* Ontario Cancer Institute, and Department of Laboratory Medicine and Pathobiology and Department of Medical Biophysics,§ Toronto Hospital/Princess Margaret Hospital and University of Toronto, Toronto, Ontario, Canada; and Department of Molecular Pathology and First Department of Surgery, Tohoku University School of Medicine, Sendai, Miyagi, Japan

We have investigated the mRNA/protein expression of several tyrosine kinase receptors, growth factors, and p16^INK4A cyclin inhibitor in cell lines derived from normal human pancreatic duct epithelium (HPDE) and compared them with those of five pancreatic ductal carcinoma cell lines. Cultured HPDE cells express low levels of epidermal growth factor receptor (EGFR), erbB2, transforming growth factor (TGF)-, Met/hepatocyte growth factor receptor (HGFR), vascular endothelial growth factor (VEGF), and keratinocyte growth factor (KGF). They also expressed high levels of amphiregulin but did not express EGF and cripto. The expression levels were similar in primary normal HPDE cells and those expressing transfected E6E7 genes of human papilloma virus-16, but their immortalization appeared to enhance the expression of EGFR and Met/HGFR. In comparison, pancreatic carcinoma cell lines commonly demonstrated overexpression of EGFR, erbB2, TGF-, Met/HGFR, VEGF, and KGF, but they consistently showed marked down-regulation of amphiregulin mRNA expression. In contrast to all carcinoma cell lines that showed deletions of the p16 gene, HPDE cells consistently demonstrated normal p16 genotype and its mRNA expression. This is the first report that compares the phenotypic expression of cultured pancreatic ductal carcinoma cells with epithelial cell lines derived from normal human pancreatic ducts. The findings confirm that malignant transformation of human pancreatic duct cells commonly results in a deregulation of expression of various growth factors and receptors.

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