Physical and functional characterisation of apoptotic cell-derived extracellular vesicles

Hawkins, Lois, Alghareeb, Khaled, Nadella, Vinod, Chauhan, Parbata, Bland, Charlotte E. and Devitt, Andrew (2014). Physical and functional characterisation of apoptotic cell-derived extracellular vesicles. IN: British Society for Immunology (BSI) annual congress. UK, 2014-12-01 - 2014-12-04.

Abstract

Damaged, aged or unwanted cells are removed from the body by an active process known as apoptosis. This highly orchestrated programme results in the exposure of 'flags' at the dying cell surface and the release of attractive signals to recruit phagocytes. Together these changes ensure efficient phagocytic removal of dying cells and prevention of inflammatory and autoimmune disorders. Extracellular vesicles (EV) are released from a variety of cells (both viable and apoptotic) and they serve as a novel means of intercellular communication. They range in size: 70-100nm ('exosomes') through 100-1000nm ('microparticles') to large vesicles released from dying cells ('apoptotic bodies'). Release of apoptotic cell-derived extracellular vesicles (acdEV) of less than 1000nm is an important mechanism by which phagocytes are attracted to sites of cell death. Using a variety of approaches we characterize the release, physical characteristics and function of acdEV. Using fluorescence microscopy we demonstrate release of ICAM-3 on acdEV from dying leukocytes and, through the use of resistive pulse technology (qNano, IZON Science), we accurately size and quantitate acdEV release. The function of acdEV is revealed through the use of both horizontal chemotaxis assays (Dunn chambers) and vertical transwell migration assays (Cell-IQ, CM Technologies). These assays reveal potent chemoattractive capacity of acdEV and associated ICAM-3. Additionally we demonstrate an additional novel function of acdEV as anti-inflammatory immune-modulators. These data support an integrated approach to the physical and functional analyses of EV.

Divisions: Life & Health Sciences > Biosciences
Life & Health Sciences
Event Title: British Society for Immunology (BSI) annual congress
Event Type: Other
Event Location: UK
Event Dates: 2014-12-01 - 2014-12-04
Published Date: 2014
Authors: Hawkins, Lois
Alghareeb, Khaled
Nadella, Vinod
Chauhan, Parbata
Bland, Charlotte E.
Devitt, Andrew ( 0000-0002-4651-6761)

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License: Creative Commons Attribution


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