Abstract
Although cancer-associated fibroblasts (CAFs) mainly produce CXCL12 and stimulate CXCL12/CXCR4 signaling in cancer cells, the significance of this interaction in adenocarcinoma of the esophagogastric junction (AEG) was unclear. This study investigated the functional characteristics of CAF-derived CXCL12 in AEG. Immunohistochemical staining for CXCL12 was performed on sections from 123 AEG patients and analyzed against clinicopathological data. Newly isolated CAFs and normal fibroblasts were examined for phenotype. An invasion assay was performed with AEG cells co-cultured with CAFs isolated from AEG. CXCL12 expression was significantly associated with age, depth of invasion, lymphatic invasion, and lymph node metastases. High CXCL12 expression significantly correlated with poor prognosis. Isolated CAFs had abundant α-smooth muscle actin expression and showed various CXCL12 expression patterns. Notably, AEG cells co-cultured with CXCLhigh-expressing CAFs invaded more than when co-cultured with CXCLlow-expressing CAFs; these invasive properties were impeded by CXCR4 antagonist AMD3100. We demonstrated that AEG cells co-cultured with CXCL12high CAFs were significantly more invasive than those co-cultured with CXCL12low CAFs and that high CXCL12 expression correlates with poor prognosis in AEG patients. CXCL12 derived from CAFs in tumor microenvironment stimulates CXCL12/CXCR4 signaling in AEG cells and promotes their invasive ability, resulting in tumor progression.
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Acknowledgments
We would like to thank Yuko Taniguchi, Naomi Yokoyama, and Yoko Ogata for their technical assistance.
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The authors declare that they have no conflict of interest.
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Sugihara, H., Ishimoto, T., Yasuda, T. et al. Cancer-associated fibroblast-derived CXCL12 causes tumor progression in adenocarcinoma of the esophagogastric junction. Med Oncol 32, 168 (2015). https://doi.org/10.1007/s12032-015-0618-7
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DOI: https://doi.org/10.1007/s12032-015-0618-7