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Background  Multiple drug resistance (MDR) of cancer cells is the main cause of intrinsic or acquired desensitization to chemotherapy in many cancers. A number of studies have found high expression of COX‐2 to be a factor for expression of MDR gene in several cancer. Furthermore, adipose tissue derived mesenchymal stem/stromal cells (ADSC) have been found to increase cyclo‐oxygenase‐2 (COX‐2) expression in some tumour cells. The mechanism for this, however, is not yet clear and needs further study.    Objective  The purpose of this study was to determine whether tumour necrosis factor‐alpha stimulated gene/protein 6 (TSG‐6) secreted from ADSCs is associated with an increase in MDR genes by inducing COX‐2 gene expression in melanoma and osteosarcoma cell lines.    Methods  ADSCs were transfected with TSG‐6 siRNA or Control RNA respected, and cancer cell line were transfected with COX‐2 siRNA or Control RNA respected. Using trans well coculture system, the interactions of ADSCs with tumour cells were investigated.    Results  Increased COX‐2 expression was observed in cancer cell co‐cultured with ADSCs. Additionally, we identified that COX‐2 expression was related to drug resistance genes (P‐glycoprotein, multidrug resistance‐associated protein). Transfecting canine ADSCs with small interfering RNA, TSG‐6 secreted from ADSCs was found to be a major factor in the regulation of COX‐2 expression and drug resistance genes in osteosarcoma and melanoma cell lines.    Conclusion  TSG‐6 mediated COX‐2 up‐regulation is a possible mechanism of chemoresistance development induced by ADSCs. These findings provide better understanding about the mechanism associated with ADSC‐induced chemoresistance in cancer.

veterinary medicine and science

Enhanced expression of cyclooxygenase‐2 related multi‐drug resistance gene in melanoma and osteosarcoma cell lines by TSG‐6 secreted from canine adipose‐derived mesenchymal stem/stromal cells