Bone-derived SDF-1 stimulates IL-6 release via CXCR4, ERK and NF-kappa B pathways and promotes osteoclastogenesis in human oral cancer cells

作者：Tang Chih Hsin^*; Chuang Jing Yuan; Fong Yi Chin; Maa Ming Chei; Way Tzong Der; Hung Chien Hui

来源：Carcinogenesis, 2008, 29(8): 1483-1492.

DOI：10.1093/carcin/bgn045

Oral squamous cell carcinoma (SCC) has a striking tendency to invade to bone. The chemokine stromal cell-derived factor-1 (SDF-1) is constitutively secreted by osteoblasts and plays a key role in homing of hematopoietic cells to the bone marrow. Interleukin (IL)-6 plays an important role in osteoclastogenesis. Herein, we found that SDF-1 alpha increased the secretion of IL-6 in cultured human SCC cells, as shown by reverse transcriptase-polymerase chain reaction and enzyme-linked immunosorbent assay. SDF-1 alpha also increased the surface expression of chemokine receptor 4 (CXCR4) in SCC cells. CXCR4-neutralizing antibody, CXCR4-specific inhibitor (AMD3100) or small interfering RNA against CXCR4 inhibited SDF-1 alpha-induced increase IL-6 production. The transcriptional regulation of IL-6 by SDF-1 alpha was mediated by phosphorylation of extracellular signal-regulated kinases (ERKs) and activation of the nuclear factor-kappa B (NF-kappa B) components p65 and p50. The binding of p65 and p50 to the NF-kappa B element on the IL-6 promoter was enhanced by SDF-1 alpha. In addition, IL-6 antibody antagonized the SCC-conditioned medium-increased osteoclastogenesis. These results suggested that SDF-1 alpha from osteoblasts could induce release of IL-6 in human SCC cells via activation of CXCR4, ERK and NF-kappa B pathway and thereby promote osteoclastogenesis.

• 出版日期2008-8
• 单位河北医科大学; 中国医科大学