Abstract
Procaspase-8 activation at the death-inducing signaling complex (DISC) triggers extrinsic apoptotic pathway. Procaspase-8 activation takes place in the death effector domain (DED) filaments and is regulated by c-FLIP proteins, in particular, by the long isoform c-FLIPL. Recently, the first-in-class chemical probe targeting the caspase-8/c-FLIPL heterodimer was reported. This rationally designed small molecule, FLIPin, enhances caspase-8 activity after initial heterodimer processing. Here, we used a kinetic mathematical model to gain an insight into the mechanisms of FLIPin action in a complex with DISC, in particular, to unravel the effects of FLIPin at different stoichiometry and composition of the DED filament. Analysis of this model has identified the optimal c-FLIPL to procaspase-8 ratios in different cellular landscapes favoring the activity of FLIPin. We predicted that the activity FLIPin is regulated via different mechanisms upon c-FLIPL downregulation or upregulation. Our study demonstrates that a combination of mathematical modeling with system pharmacology allows development of more efficient therapeutic approaches and prediction of optimal treatment strategies.
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Abbreviations
- DED:
-
death effector domain
- DISC:
-
death-inducing signaling complex
- DR:
-
death receptor
- FLIPin:
-
FLIP inhibitor
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Funding
This work was supported by the Russian Foundation for Basic Research (projects nos. 19-54-45015, 18-04-00207) and by the Russian State Budget Project (AAAA-A17-117092070032-4).
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The authors declare that they have no conflicts of interest. This article does not contain any studies involving human participants or animals performed by any of the authors.
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Ivanisenko, N.V., Lavrik, I.N. Mathematical Modeling Reveals the Importance of the DED Filament Composition in the Effects of Small Molecules Targeting Caspase-8/c-FLIPL Heterodimer. Biochemistry Moscow 85, 1134–1144 (2020). https://doi.org/10.1134/S0006297920100028
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DOI: https://doi.org/10.1134/S0006297920100028