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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.

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

    Abstract

    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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