Secreted Protein Acidic and Rich in Cysteine (SPARC) Enhances Cell Proliferation, Migration, and Epithelial Mesenchymal Transition, and SPARC Expression is Associated with Tumor Grade in Head and Neck Cancer

• Published in: International journal of molecular sciences 2017-07, Vol.18 (7), p.1556
• Main Authors: Chang, Chih-Hau, Yen, Meng-Chi, Liao, Ssu-Hui, Hsu, Yu-Ling, Lai, Chung-Sheng, Chang, Kao-Ping, Hsu, Ya-Ling
• Format: Article
• Language: English
• Subjects: Cell Line, Tumor; Cell Movement - drug effects; Cell Movement - genetics; Cell Proliferation - drug effects; Cell Proliferation - genetics; epithelial mesenchymal transition; Epithelial-Mesenchymal Transition - drug effects; Epithelial-Mesenchymal Transition - genetics; Gene Expression Regulation, Neoplastic - drug effects; head and neck cancer; Head and Neck Neoplasms - genetics; Head and Neck Neoplasms - pathology; Humans; migration; Models, Biological; Neoplasm Grading; Osteonectin - genetics; Osteonectin - metabolism; Osteonectin - pharmacology; Phenotype; proliferation; secreted protein acidic and rich in cysteine; Signal Transduction - drug effects
• ISSN: 1422-0067; 1422-0067
• DOI: 10.3390/ijms18071556

Secreted protein acidic and rich in cysteine (SPARC) is a secreted protein which is involved in various biological processes. SPARC expression is associated with tumor metastasis and poor prognosis in several types of cancer. However, the SPARC-induced signaling pathway was not fully understood in head and neck cancer. In this study, our results showed that SPARC treatment promoted cell proliferation and migration in head and neck cancer cell lines FaDu and Detroit 562. In addition, SPARC induced expression of epithelial mesenchymal transition (EMT) regulators, including Slug, Snail, and Twist in Detroit 562. The results of phospho-kinase array analysis showed that SPARC treatment increased phosphorylation of some molecules including protein kinase B (PKB/AKT), ribosomal S6 kinase (RSK), and extracellular signal-regulated kinases (ERK). The expression of SPARC-induced EMT regulator Slug was suppressed by AKT inhibitor, but not ERK and RSK inhibitors. The SPARC expression in grade IV tumor samples is higher when compared to that in grade I-III tumor samples. Our results suggest that SPARC treatment enhances the EMT signaling pathway via activation of AKT, and exogenous SPARC and tumor expressing SPARC might be associated with tumor progression in head and neck cancers.