RIP1-dependent linear and nonlinear recruitments of caspase-8 and RIP3 respectively to necrosome specify distinct cell death outcomes
Xiang Li , Chuan-Qi Zhong , Rui Wu , Xiaozheng Xu , Zhang-Hua Yang , Shaowei Cai , Xiurong Wu , Xin Chen , Zhiyong Yin , Qingzu He , Dianjie Li , Fei Xu , Yihua Yan , Hong Qi , Changchuan Xie , Jianwei Shuai , Jiahuai Han
Protein Cell ›› 2021, Vol. 12 ›› Issue (11) : 858 -876.
RIP1-dependent linear and nonlinear recruitments of caspase-8 and RIP3 respectively to necrosome specify distinct cell death outcomes
There remains a significant gap in our quantitative understanding of crosstalk between apoptosis and necroptosis pathways. By employing the SWATH-MS technique, we quantified absolute amounts of up to thousands of proteins in dynamic assembling/deassembling of TNF signaling complexes. Combining SWATH-MS-based network modeling and experimental validation, we found that when RIP1 level is below ∼1000 molecules/cell (mpc), the cell solely undergoes TRADDdependent apoptosis. When RIP1 is above ∼1000 mpc, pro-caspase-8 and RIP3 are recruited to necrosome respectively with linear and nonlinear dependence on RIP1 amount, which well explains the co-occurrence of apoptosis and necroptosis and the paradoxical observations that RIP1 is required for necroptosis but its increase down-regulates necroptosis. Higher amount of RIP1 (>∼46,000 mpc) suppresses apoptosis, leading to necroptosis alone. The relation between RIP1 level and occurrence of necroptosis or total cell death is biphasic. Our study provides a resource for encoding the complexity of TNF signaling and a quantitative picture how distinct dynamic interplay among proteins function as basis sets in signaling complexes, enabling RIP1 to play diverse roles in governing cell fate decisions.
necrosome / protein complexes quantification / RIP1 / SWATH-MS / network modeling
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The Author(s)
Supplementary files
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