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Apoptosis

Apoptosis

IF: 6.1
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mTOR pathway mediates endoplasmic reticulum stress-induced CD4+ T cell apoptosis in septic mice

Published:27 June 2022 DOI: 10.1007/s10495-022-01740-1
Guangxu Bai, Hao Wang, Na Cui

Abstract

Endoplasmic reticulum stress (ERS) has been well documented to participate in the pathophysiological processes of apoptosis in many diseases. Inhibition of ERS ameliorates pathological organ injury. However, the upstream signaling pathways and molecular regulatory mechanisms of which are still unknown. mTOR, an evolutionarily conserved protein kinase, is a key regulator of apoptosis. Hence, in this study, a classical cecal ligation and puncture (CLP) sepsis model was constructed by using the T cell-specific knockout mTOR and TSC1 (Tuberous Sclerosis Complex, the inhibitor of mTOR signaling pathway) mice to explore the underlying signaling pathway and molecular mechanism of host immune imbalance caused by apoptosis in sepsis. We found that mTOR may modulate septic T cell apoptosis by regulating Akt–IRE1–JNK pathway. To further clarify the possible mechanism, the specific inhibitors of PI3K-Akt and IRE1–JNK were used to intervene in mice before/after CLP, respectively. By analyzing the proteins of mTOR-ERS signaling pathway and the expression of apoptosis-related proteins and genes, we found that mTOR mediated the ER stress induced CD4+ T cell apoptosis in Septic mice by negatively regulating the Akt–IRE1–JNK-Caspase 3 signaling cascades. These results indicate that mTOR–Akt–IRE1α–JNK signaling pathway mediated the Endoplasmic reticulum stress induced CD4+ T cell apoptosis in Septic mice.

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