Effects of bone sialoprotein on pancreatic cancer cell growth, invasion and metastasis

• Published in: Cancer letters Vol. 245; no. 1; pp. 171 - 183
• Main Authors: Kayed, Hany, Kleeff, Jörg, Keleg, Shereen, Felix, Klaus, Giese, Thomas, Berger, Martin R, Büchler, Markus W, Friess, Helmut
• Format: Journal Article
• Language: English
• Published: Ireland Elsevier Ireland Ltd 08-01-2007; Elsevier Limited
• Subjects: Bones; Breast cancer; Carcinoma, Pancreatic Ductal - genetics; Carcinoma, Pancreatic Ductal - metabolism; Carcinoma, Pancreatic Ductal - pathology; Cell Adhesion; Cell culture; Cell Line, Tumor; Cell Movement - drug effects; Cell Proliferation - drug effects; Cell Survival - drug effects; Colleges & universities; DNA Methylation; Dose-Response Relationship, Drug; Gene Expression Regulation, Neoplastic; Glycoprotein; Hematology, Oncology and Palliative Medicine; Humans; Immunoblotting; Immunohistochemistry; Integrin-Binding Sialoprotein; Invasion; Metastasis; Migration; Molecular weight; Neoplasm Invasiveness; Neoplasm Metastasis; Pancreas; Pancreatic cancer; Pancreatic Neoplasms - genetics; Pancreatic Neoplasms - metabolism; Pancreatic Neoplasms - pathology; Pathogenesis; Proliferation; Promoter Regions, Genetic; Proteins; Radioimmunoassay; Recombinant Proteins - pharmacology; Reverse Transcriptase Polymerase Chain Reaction - methods; RNA, Messenger - genetics; RNA, Messenger - metabolism; Sialoglycoproteins - blood; Sialoglycoproteins - genetics; Sialoglycoproteins - metabolism; Germany; Metastasis; Proliferation; Invasion; Glycoprotein
• ISSN: 0304-3835; 1872-7980
• DOI: 10.1016/j.canlet.2006.01.002

Abstract Bone sialoprotein (BSP) is an acidic glycoprotein that plays an important role in cancer cell growth, migration and invasion. The expression, localization and possible function of BSP in chronic pancreatitis (CP) and pancreatic ductal adenocarcinoma (PDAC) were analyzed by QRT-PCR, laser capture microdissection, DNA microarray analysis, immunoblotting, radioimmunoassays and immunohistochemistry as well as cell growth, invasion, scattering, and adhesion assays. BSP mRNA was detected in 40.7% of normal, in 80% of CP and in 86.4% of PDAC samples. The median BSP mRNA levels were 6.1 and 0.9 copies/μl cDNA in PDAC and CP tissues, respectively, and zero copies/μl cDNA in normal pancreatic tissues. BSP was weakly present in the cytoplasm of islet cells and ductal cells in 20% of normal pancreatic tissues. BSP was localized in the tubular complexes of both CP and PDAC, as well as in pancreatic cancer cells. Five out of 8 pancreatic cancer cell lines expressed BSP mRNA. Recombinant BSP (rBSP) inhibited Capan-1 and SU8686 pancreatic cancer cell growth, with a maximal effect of −46.4±12.0% in Capan-1 cells and −45.7±14.5% in SU8686 cells. rBSP decreased the invasion of SU8686 cells by −59.1±11.2% and of Capan-1 cells by −13.3±3.8% ( P <0.05), whereas it did not affect scattering or adhesion of both cell lines. In conclusion, endogenous BSP expression levels in pancreatic cancer cells and low to absent BSP expression in the surrounding stromal tissue elements may indirectly act to enhance the proliferation and invasion of pancreatic cancer cells.