UNIT 14.36 Immunomagnetic Isolation of Pathogen‐Containing Phagosomes and Apoptotic Blebs from Primary Phagocytes. (2nd April 2014)

• Record Type: Journal Article
• Authors: Steinhäuser, Christine; Dallenga, Tobias; Tchikov, Vladimir; Schaible, Ulrich E.; Schütze, Stefan; Reiling, Norbert
• Is Part Of: Current protocols in immunology. Volume 105(2014)
• Page Start: 14.36.1
• Page End: 14.36.26
• Publication Date: 2014-04-02
• Subjects: macrophages -- primary cells -- mycobacteria -- phagosomes -- apoptotic vesicles -- isolation protocol; Immunology -- Laboratory manuals; Medical protocols; Immunologic Techniques; Medical protocols; Immunology; Laboratory manuals; Reference works; 571.96028
• DOI: 10.1002/0471142735.im1436s105
• Languages: English
• ISSNs: 1934-3671

Abstract

Abstract: Macrophages and polymorphonuclear neutrophils are professional phagocytes essential in the initial host response against intracellular pathogens such as Mycobacterium tuberculosis . Phagocytosis is the first step in phagocyte‐pathogen interaction, where the pathogen is engulfed into a membrane‐enclosed compartment termed a phagosome. Subsequent effector functions of phagocytes result in killing and degradation of the pathogen by promoting phagosome maturation, and, terminally, phago‐lysosome fusion. Intracellular pathogenic microbes use various strategies to avoid detection and elimination by phagocytes, including induction of apoptosis to escape host cells, thereby generating apoptotic blebs as shuttles to other cells for pathogens and antigens thereof. Hence, phagosomes represent compartments where host and pathogen become quite intimate, and apoptotic blebs are carrier bags of the pathogen's legacy. In order to investigate the molecular mechanisms underlying these interactions, both phagosomes and apoptotic blebs are required as purified subcellular fractions for subsequent analysis of their biochemical properties. Here, we describe a lipid‐based procedure to magnetically label surfaces of either pathogenic mycobacteria or apoptotic blebs for purification by a strong magnetic field in a novel free‐flow system. Curr. Protoc. Immunol . 105:14.36.1‐14.36.26. © 2014 by John Wiley & Sons, Inc.