CUB Domain-containing Protein 1 (CDCP1) Is Down-regulated by Active Hexose-correlated Compound in Human Pancreatic Cancer Cells

BACKGROUND/AIM We have previously reported that treatment of pancreatic cancer cells with active hexose-correlated compound (AHCC), an extract of a basidiomycete mushroom, decreases the levels of tumor-associated proteins including heat-shock protein 27 (HSP27), heat shock factor 1 (HSF1) and sex-determining region Y-box 2 (SOX2). The transmembrane glycoprotein, CUB domain-containing protein 1 (CDCP1) has been reported to be up-regulated in various cancers, and be associated with invasion and metastasis. The aim of this study was to examine the effect of AHCC on the expression of CDCP1 in KLM1-R cells. MATERIALS AND METHODS Gemcitabine-resistant pancreatic cancer cells (KLM1-R) were treated with AHCC (10 mg/ml) for 48 h. Western blot analysis of cell extracts with anti-CDCP1 or anti-actin antibodies was performed to assess the expression of CDCP1. RESULTS Expression of CDCP1 was reduced by AHCC treatment of KLM1-R cells, whereas expression of actin was not affected. The ratio of intensities of CDCP1/actin in AHCC-treated KLM1-R cells was significantly suppressed (p