PLEKHO2 inhibits TNFα-induced cell death by suppressing RIPK1 activation |
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| Authors: | Chenchen Zhou Xueli Zhang Cuiping Yang Yuan He Luo Zhang |
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| Institution: | 1.Department of Biomedical Engineering, the Fifth medical Centre, Chinese PLA General Hospital, Beijing, 100071 China ;2.Department of pathology, the Fifth medical Centre, Chinese PLA General Hospital, Beijing, 100071 China ;3.Department of Respiratory and Critical Care Medicine, the Fifth medical Centre, Chinese PLA General Hospital, Beijing, 100071 China ;4.Research Center of Bioengineering, the Medical Innovation Research Division of Chinese PLA General Hospital, Beijing, 100039 China |
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| Abstract: | Receptor interaction protein kinase 1 (RIPK1) plays a diverse role in tumor necrosis factor α (TNFα) signalings. The ubiquitination of RIPK1 is essential for NF-κB activation, whereas its kinase activity promotes apoptosis and necroptosis. However, the mechanisms underlying have not been fully illuminated. Here we report that PH domain-containing family O member 2 (PLEKHO2) inhibits RIPK1-dependent cell death and is necessary for NF-κB activation in response to TNFα. Cells of PLKEHO2 deficiency are more susceptible to TNF-α induced apoptosis and necroptosis with increased RIPK1 activation, which is consistent with the observation that the susceptibility of PLEKHO2−/− cells is effectively prevented by treatment of RIPK1 kinase inhibitor. Moreover, PLEKHO2 deficient cells exhibit compromised RIPK1 ubiquitination and NF-κB activation in response to TNFα. Ultimately, PLEKHO2-deficient mice display greatly increased hepatotoxicity and lethality after TNFα-induced hepatitis. In summary, our study revealed that PLEKHO2 is a novel inhibitor of apoptosis and necroptosis, which plays a key role in regulating RIPK1 ubiquitination and activationSubject terms: Apoptosis, Ubiquitylation |
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