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    Cancer Lett. 2004 Apr 30;207(2):139-47.

    Expression and localization of ecto-nucleotide pyrophosphatase/phosphodiesterase I-1 (E-NPP1/PC-1) and -3 (E-NPP3/CD203c/PD-Ibeta/B10/gp130(RB13-6)) in inflammatory and neoplastic bile duct diseases.

    Yano Y, Hayashi Y, Sano K, Nagano H, Nakaji M, Seo Y, Ninomiya T, Yoon S, Yokozaki H, Kasuga M.

    Department of Clinical Molecular Medicine, Division of Diabetes, Digestive, and Kidney Diseases, Kobe University Graduate School of Medicine, Kobe, Japan.

    Ecto-nucleotide pyrophosphatase/phosphodiesterase-I enzyme (E-NPP) consists of three closely related molecules: E-NPP1, E-NPP2 and E-NPP3. We investigated the expression and localization of E-NPP1 and -3 in human inflammatory and neoplastic bile duct diseases. Immunohistochemically E-NPP1 was located on the apical cytoplasmic side of cancer cells, whereas E-NPP3 was located in the apical plasma membrane. Western blot analysis revealed that the expression of E-NPP3, but not E-NPP1, was higher in tumor tissues than in surrounding tissues and the specific form of the E-NPP3 protein was readily detected in the sera of bile duct carcinoma (BDC) patients. Furthermore, it was confirmed that E-NPP3 was associated with migration ability by using of NIH3T3 cells that stably transfected with E-NPP3 cDNA. These results suggest that E-NPP3 is involved in the infiltration of neoplastic BDC and is possible to be a tumor marker.

    PMID: 15072822 [PubMed - indexed for MEDLINE]

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