Abstract
The production of interleukin-6 (IL-6) has been discovered in a variety of human tumors. Here we report the expression of IL-6, IL-6 receptor α (IL-6Rα), and gp130 in human esophageal carcinoma tissues. We further demonstrate that IL-6 protects an esophageal carcinoma cell line CE48T/VGH from apoptosis induced by staurosporine. IL-6 stimulation induced a rapid phosphorylation of gp130 and STAT3, and a dominant-negative STAT3 completely abolished the antiapoptotic effect. IL-6 also activated ERK 1/2 in CE48T/VGH cells. Inhibition of the ERK activation by PD98059 and transfection of a dominant-negative ERK2 completely blocked the protection of IL-6 against apoptosis. Thus, both STAT and MAP kinase pathways are responsible for the IL-6-delivered survival signal in human esophageal carcinoma cells. In contrast, PI3-K inhibitors only partially attenuated the effect of IL-6, suggesting that PI3-K does not play a major role in the antiapoptotic signal of IL-6 in our system. To investigate whether IL-6 could induce the production of antiapoptotic molecules, proteins of the Bcl-2 family were measured. While Bcl-2, Bcl-xL,, and Bax were not affected, Mcl-1 was induced by IL-6 in human esophageal carcinoma cells. Our results suggest that IL-6 may contribute to the progression of esophageal cancers in an autocrine or paracrine manner.
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Acknowledgements
We thank Dr Jen-Ping Chang, Dr Pyng-Jing Lin, Dr Biing-Shiun Huang, Dr Yi-Ming Chen, and Dr Yi-Jen Chen for providing the surgical specimens. We also thank Dr Ming-Ji Fann and Dr Ruey-Hwa Chen for their valuable suggestions. We appreciate Ms Shiang-Lien Lu for her excellent secretarial assistance. This work was supported in part by Grants NSC88-2314-B075-013 from the National Science Council and VTY89-P5-45 from VTY Joint Research Program, Tsou's Foundation, Taiwan, Republic of China.
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Leu, CM., Wong, FH., Chang, C. et al. Interleukin-6 acts as an antiapoptotic factor in human esophageal carcinoma cells through the activation of both STAT3 and mitogen-activated protein kinase pathways. Oncogene 22, 7809–7818 (2003). https://doi.org/10.1038/sj.onc.1207084
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DOI: https://doi.org/10.1038/sj.onc.1207084
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