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Erschienen in: Journal of Clinical Immunology 2/2012

01.04.2012

PTX3 Is Located at the Membrane of Late Apoptotic Macrophages and Mediates the Phagocytosis of Macrophages

verfasst von: Tangmeng Guo, Li Ke, Benling Qi, Jingjing Wan, Jing Ge, Lijuan Bai, Bei Cheng

Erschienen in: Journal of Clinical Immunology | Ausgabe 2/2012

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Abstract

Apoptotic macrophages are removed by neighboring phagocytes (efferocytosis), which is an important event in advanced atherosclerosis. Recent reports have elucidated some key molecular regulators in efferocytosis including complement C1q, MFGE8, and MERTK. However, it remains unknown whether the long pentraxin 3 (PTX3), which is an important molecule that is involved in apoptotic cell clearance in the immune response, plays a part in efferocytosis during advanced atherosclerosis. In this study, we modeled macrophage apoptosis in advanced plaques by incubating macrophages (peritoneal macrophages isolated from C57 mice) with free cholesterol (free cholesterol-induced apoptotic macrophages, FC-AMs). FC-AMs were added to a monolayer of fresh phagocytes to study the engulfment response. We observed that PTX3 was mainly located at the membrane of late apoptotic macrophages. The anti-PTX3 monoclonal Ab 16B5 inhibited the engulfment of late apoptotic macrophages by phagocytes in a dose-dependent manner (from 14.63% inhibition at 5 μg/ml to 26.19% inhibition at 50 μg/ml). These results suggest that PTX3 located at the membrane of late apoptotic macrophages mediates their phagocytosis by phagocytes in a cell model of advanced atherosclerosis.
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Metadaten
Titel
PTX3 Is Located at the Membrane of Late Apoptotic Macrophages and Mediates the Phagocytosis of Macrophages
verfasst von
Tangmeng Guo
Li Ke
Benling Qi
Jingjing Wan
Jing Ge
Lijuan Bai
Bei Cheng
Publikationsdatum
01.04.2012
Verlag
Springer US
Erschienen in
Journal of Clinical Immunology / Ausgabe 2/2012
Print ISSN: 0271-9142
Elektronische ISSN: 1573-2592
DOI
https://doi.org/10.1007/s10875-011-9615-6

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