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A Novel IgM-H-ficolin Complement Pathway to Attack Allogenic Cancer Cells in Vitro

Overview
Journal Sci Rep
Specialty Science
Date 2015 Jan 17
PMID 25592840
Citations 10
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Abstract

The pentameric serum IgMs are critical to immune defense and surveillance through cytotoxicity against microbes and nascent cancer cells. Ficolins, a group of oligomeric lectins with an overall structure similar to C1q and mannose-binding lectin (MBL) participate in microbe infection and apoptotic cell clearance by activating the complement lectin pathway or a primitive opsonophagocytosis. It remains unknown whether serum IgMs interplay with ficolins in cancer immunosurveillance. Here we report a natural cancer killing of different types of cancer cells by sera from a healthy human population mediated by a novel IgM-H-ficolin complement activation pathway. We demonstrate for the first time that H-ficolin bound to a subset of IgMs in positive human sera and IgM-H-ficolin deposited on cancer cells to activate complement attack in cancer cells. Our data suggest that the IgM-H-ficolin -mediated complement activation pathway may be another defensive strategy for human cancer immunosurveillance.

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