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- W3148299310 abstract "IL-6 is synthesized in human pampilloma virus (HPV)-transformed cervical carcinoma cell lines and is supposed to stimulate these cells in an autocrine manner. We studied IL-6 production and responsiveness in nonmalignant HPV-transformed keratinocytes and cervical carcinoma cells in detail. IL-6 was detected in cervical carcinomas in situ. Correspondingly, HPV-positive carcinoma cell lines expressed high IL-6 levels. However, these carcinoma cell lines showed low responsiveness to IL-6 as revealed by low constitutive STAT3 binding activity, which was not further enhanced by exogenous IL-6. In contrast, in vitro-transformed nonmalignant keratinocytes without endogenous IL-6 production strongly responded to exogenous IL-6 with activation of STAT3. STAT3 protein expression levels were comparable in both responsive and nonresponsive cell lines. Also, gp130, the upstream signal-transducing receptor subunit conveying IL-6 signals into the cell, was expressed in all tested cell lines. However, the IL-6 binding subunit gp80 was lost in the malignant cells. Addition of soluble gp80 was sufficient to restore IL-6 responsiveness in carcinoma cells as shown by enhanced activation of STAT3 binding activity. As a consequence of the restored IL-6 responsiveness, carcinoma cells strongly produced the chemokine monocyte chemoattractant protein-1 (MCP-1). Our data demonstrate that cervical carcinoma cells producing high amounts of IL-6 only weakly respond to IL-6 in an autocrine manner due to limited gp80 expression. While production of IL-6 might contribute to a local immunosuppressive effect, silencing an autocrine IL-6 response prevents constitutive production of the mononuclear cell-attracting chemokine MCP-1. Both mechanisms might help the tumor to escape the immune system." @default.
- W3148299310 created "2021-04-13" @default.
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- W3148299310 date "2021-03-28" @default.
- W3148299310 modified "2023-10-16" @default.
- W3148299310 title "17 Lupus treatment in the next decade: the next decade is upon us" @default.
- W3148299310 doi "https://doi.org/10.1136/lupus-2021-la.17" @default.
- W3148299310 hasPublicationYear "2021" @default.
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