Caspase-3 serves as an intracellular immune receptor specific for lipopolysaccharide in oyster Crassostrea gigas

Apoptosis is a form of programmed cell death process controlled by a family of cysteine proteases called caspases, which plays a crucial role in the immune system homeostasis. The apoptosis and the detailed regulation mechanism have been well studied in vertebrate, but the information in lower anima...

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Bibliographic Details
Published in:Developmental & Comparative Immunology
Main Authors: Xu, Jiachao, Jiang, Shuai, Li, Yiqun, Li, Meijia, Cheng, Qi, Zhao, Depeng, Yang, Bin, Jia, Zhihao, Wang, Lingling, Song, Linsheng
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Crassostrea Gigas
Caspase-3
Intracellular Immune Receptor
Lps
Immune Response
Apoptosis
Pacific
Crassostrea gigas
Pacific oyster
Online Access:http://ir.qdio.ac.cn/handle/337002/126232
https://doi.org/10.1016/j.dci.2016.03.015
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Summary:Apoptosis is a form of programmed cell death process controlled by a family of cysteine proteases called caspases, which plays a crucial role in the immune system homeostasis. The apoptosis and the detailed regulation mechanism have been well studied in vertebrate, but the information in lower animals, especially invertebrates, is still very limited. In the present study, Caspase-3 in the Pacific oyster Crassostrea gigas (designated CgCaspase-3) was enriched by lipopolysaccharide (LPS) affinity chromatography and further identified by MALDI-TOF/TOF-mass spectrometry. The binding activity of CgCaspase-3 to LPS was confirmed by enzyme-linked immunosorbent assay, and surface plasmon resonance analysis revealed its high binding specificity and moderate binding affinity (K-D = 1.08 x 10(-6) M) to LPS. The recombinant CgCaspase-3 exhibited high proteolytic activity to substrate Ac-DEVD-pNA and relatively weak activity to substrate Ac-DMQD-pNA and Ac-VDQQD-pNA. The binding of CgCaspase-3 to LPS significantly inhibited its proteolytic activity toward AC-DEVD-pNA in vitro. The over-expression of CgCaspase-3 leaded to the phosphatidylserine exposure on the external plasma membrane and the cleavage of poly (ADP-ribose) polymerase, which reduced cell viability, and finally induced cell apoptosis. But the cell apoptosis mediated by CgCaspase-3 in vivo was significantly inhibited by the treatment of LPS. These results collectively indicated that CgCaspase-3 could serve as an intracellular LPS receptor, and the interaction of LPS with CgCaspase-3 specifically inhibited the cell apoptosis induced by CgCaspase-3. (C) 2016 Elsevier Ltd. All rights reserved.

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