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The metabolite α-KG induces GSDMC-dependent pyroptosis through death receptor 6-activated caspase-8

Open access
Zhang, Jia-yuan, Zhou, Bo, Sun, Ru-yue, Ai, Yuan-li, Cheng, Kang, Li, Fu-nan, Wang, Bao-rui, Liu, Fan-jian, Jiang, Zhi-hong, Wang, Wei-jia, Zhou, Dawang, Chen, Hang-zi, Wu, Qiao·2021·Cell Research

Abstract

Pyroptosis is a form of regulated cell death mediated by gasdermin family members, among which the function of GSDMC has not been clearly described. Herein, we demonstrate that the metabolite α-ketoglutarate (α-KG) induces pyroptosis through caspase-8-mediated cleavage of GSDMC. Treatment with DM-αKG, a cell-permeable derivative of α-KG, elevates ROS levels, which leads to oxidation of the plasma membrane-localized death receptor DR6. Oxidation of DR6 triggers its endocytosis, and then recruits both pro-caspase-8 and GSDMC to a DR6 receptosome through protein-protein interactions. The DR6 receptosome herein provides a platform for the cleavage of GSDMC by active caspase-8, thereby leading to pyroptosis. Moreover, this α-KG-induced pyroptosis could inhibit tumor growth and metastasis in mouse models. Interestingly, the efficiency of α-KG in inducing pyroptosis relies on an acidic environment in which α-KG is reduced by MDH1 and converted to L-2HG that further boosts ROS levels. Treatment with lactic acid, the end product of glycolysis, builds an improved acidic environment to facilitate more production of L-2HG, which makes the originally pyroptosis-resistant cancer cells more susceptible to α-KG-induced pyroptosis. This study not only illustrates a pyroptotic pathway linked with metabolites but also identifies an unreported principal axis extending from ROS-initiated DR6 endocytosis to caspase-8-mediated cleavage of GSDMC for potential clinical application in tumor therapy.

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Metadata

Authors
Zhang, J.-Y., Zhou, B., Sun, R.-Y., Ai, Y.-L., Cheng, K., Li, F.-N., Wang, B.-R., Liu, F.-J., Jiang, Z.-H., Wang, W.-J., Zhou, D., Chen, H.-Z., & Wu, Q.
Venue
Cell Research
Published
2021-05-19
Volume
31
Issue
9
Pages
980-997
ISSN
  • 1001-0602 (ISSN-L)
  • 1748-7838
OpenAlex
W3163560329
Cited by
392
References
17
FWCI
15.50
Type
journal article
Language
en
Open access
hybrid

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Zhang, J.-Y., Zhou, B., Sun, R.-Y., Ai, Y.-L., Cheng, K., Li, F.-N., Wang, B.-R., Liu, F.-J., Jiang, Z.-H., Wang, W.-J., Zhou, D., Chen, H.-Z., & Wu, Q. (2021). The metabolite α-KG induces GSDMC-dependent pyroptosis through death receptor 6-activated caspase-8. Cell Research. https://doi.org/10.1038/s41422-021-00506-9

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