西亚试剂：Caenorhabditis elegans transthyretin-like protein TTR-52 me

发布时间：2026-01-04

Caenorhabditis elegans transthyretin-like protein TTR-52 mediates recognition of apoptotic cells by the CED-1 phagocyte receptor
Xiaochen Wang1,2, Weida Li2,4, Dongfeng Zhao2,4, Bin Liu2,4, Yong Shi1,4, Baohui Chen2, Hengwen Yang1, Pengfei Guo2, Xin Geng1, Zhihong Shang1, Erin Peden1, Eriko Kage-Nakadai3, Shohei Mitani3 & Ding Xue1

During apoptosis, dying cells are swiftly removed by phagocytes. It is not fully understood how apoptotic cells are recognized by phagocytes. Here we report the identification and characterization of the Caenorhabditis elegans ttr-52 gene, which encodes a transthyretin-like protein and is required for efficient cell corpse engulfment. The TTR-52 protein is expressed in, and secreted from, C. elegans endoderm and clusters around apoptotic cells. Genetic analysis indicates that TTR-52 acts in the cell corpse engulfment pathway mediated by CED-1, CED-6 and CED-7 and affects clustering of the phagocyte receptor CED-1 around apoptotic cells. TTR-52 recognizes surface-exposed phosphatidylserine (PtdSer) in vivo and binds to both PtdSer and the extracellular domain of CED-1 in vitro. TTR-52 is therefore the first bridging molecule identified in C. elegans that mediates recognition of apoptotic cells by crosslinking the PtdSer 'eat me' signal with the phagocyte receptor CED-1.

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