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Sano, Emiko; Kazaana, Akira; Tadakuma, Hisashi; Takei, Toshiaki; Yoshimura, Sodai; Hanashima, Yuya; Ozawa, Yoshinari; Yoshino, Atsuo; Suzuki, Yutaka; Ueda, Takuya
Biochimica et biophysica acta. Molecular cell research, June 2021, 2021-Jun, 2021-06-00, 20210601, Volume: 1868, Issue: 7Journal Article
Interleukin-6 (IL-6) enhanced TNF-α and TRAIL/Apo2L induced cell death in various human cancer cells derived from malignant glioma, melanoma, breast cancer and leukemia, although the effect was not detected with IL-6 alone. The effects of IL-6 using SKBR3 cells were associated with the generation of apoptotic cells as analyzed by fluorescence microscopy and flow cytometry. IL-6 activated p53 and upregulated TRAIL death receptors (DR-4 and DR-5) and stimulated the TNF-α and TRAIL dependent extrinsic apoptotic pathway without activation of the p53 mediated intrinsic apoptotic pathway. TNF-α and TRAIL induced cleavage of caspase-8 and caspase-3 was more enhanced by IL-6, although these caspases were not cleaved by IL-6 alone. The dead cell generation elicited by the combination with IL-6 was blocked by anti-human TRAIL R2/TNFRSF10B Fc chimera antibody which can neutralize the DR-5 mediated death signal. These findings indicate that IL-6 could contribute to the enhancement of TNF-α or TRAIL induced apoptosis through p53 dependent upregulation of DR-4 and DR-5. The data suggest that a favorable therapeutic interaction could occur between TNF-α or TRAIL and IL-6, and provide an experimental basis for rational clinical treatments in various cancers. •IL-6 enhanced TNF-α and TRAIL/Apo2L induced cell death in human cancer cells.•IL-6 promotes cell death through p53 dependent upregulation of death receptors.•IL-6 sensitizes fas and TRAIL mediated extrinsic apoptotic pathway.•IL-6 enhanced the cleavage of caspase-8 and caspase-9 promoted by TNF-α and TRAIL.
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