Overexpression of interleukin-6 in human basal cell carcinoma cell lines increases anti-apoptotic activity and tumorigenic potency

Oncogene
S H JeeM L Kuo

Abstract

Interleukin-6 (IL-6) is a pleiotropic cytokine that is capable of modulating the diverse functions of cells such as acute phase responses and inflammation. Excessive or insufficient production of IL-6 may contribute to certain diseases of the skin. The aim of this study was to investigate the possible role of IL-6 in the tumorigenesis of basal cell carcinoma (BCC). Initially, we transfected IL-6 expression vector, under the control of a CMV promoter, into human BCC cells and successfully obtained IL-6-overexpressing clones (BCC/IL-6-c1 and BCC/IL-6-c2) and a mixture (BCC/IL-6). DNA synthesis assay determined using (3)H-thymidine pulse incorporation revealed that IL-6-expressing BCC cells exhibited a much higher DNA synthesis rate than the neo control or parental BCC cells. We also detected a greater abundance of IL-6-expressing cell colonies formed in soft agar than in the vector control cells. Furthermore, BCC/IL-6 cells, but not vector control cells, were resistant to UV and photodynamic therapy (PDT)-induced apoptosis, as confirmed using DNA fragmentation and morphologic change analyses. Immunoblot analysis showed that Mcl-1, an anti-apoptotic protein, was specifically up-regulated IL-6 transfectants but not in the control c...Continue Reading

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