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Interfacial actin protrusions mechanically enhance killing by cytotoxic T cells

Journal Article · · Science Immunology

Cytotoxic T lymphocytes (CTLs) kill by forming immunological synapses with target cells and secreting toxic proteases and the pore-forming protein perforin into the intercellular space. Immunological synapses are highly dynamic structures that boost perforin activity by applying mechanical force against the target cell. Here, we used high-resolution imaging and microfabrication to investigate how CTLs exert synaptic forces and coordinate their mechanical output with perforin secretion. Using micropatterned stimulatory substrates that enable synapse growth in three dimensions, we found that perforin release occurs at the base of actin-rich protrusions that extend from central and intermediate locations within the synapse. These protrusions, which depended on the cytoskeletal regulator WASP and the Arp2/3 actin nucleation complex, were required for synaptic force exertion and efficient killing. They also mediated physical deformation of the target cell surface during CTL–target cell interactions. Here our results reveal the mechanical basis of cellular cytotoxicity and highlight the functional importance of dynamic, three-dimensional architecture in immune cell-cell interfaces.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1508745
Report Number(s):
BNL--211580-2019-JAAM
Journal Information:
Science Immunology, Journal Name: Science Immunology Journal Issue: 33 Vol. 4; ISSN 2470-9468
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

References (64)

Wiskott-Aldrich syndrome protein: Emerging mechanisms in immunity journal September 2017
Dynamic Actin Polymerization Drives T Cell Receptor–Induced Spreading journal March 2001
The Immunological Synapse of CTL Contains a Secretory Domain and Membrane Bridges journal November 2001
Wiskott-Aldrich Syndrome Protein Regulates Lipid Raft Dynamics during Immunological Synapse Formation journal August 2002
Visualizing Dynamic Microvillar Search and Stabilization during Ligand Detection by T Cells journal February 2018
Opposing Effects of PKCθ and WASp on Symmetry Breaking and Relocation of the Immunological Synapse journal May 2007
Cytotoxic T Cells Use Mechanical Force to Potentiate Target Cell Killing journal March 2016
The Wiskott-Aldrich Syndrome Protein Contributes to the Assembly of the LFA-1 Nanocluster Belt at the Lytic Synapse journal January 2018
The WAVE2 Complex Regulates Actin Cytoskeletal Reorganization and CRAC-Mediated Calcium Entry during T Cell Activation journal January 2006
Role for the Abi/Wave Protein Complex in T Cell Receptor-Mediated Proliferation and Cytoskeletal Remodeling journal January 2006
Distinct Roles for the Actin Nucleators Arp2/3 and hDia1 during NK-Mediated Cytotoxicity journal December 2009
Distinct Roles for the Actin Nucleators Arp2/3 and hDia1 during NK-Mediated Cytotoxicity journal September 2010
Formins Regulate the Actin-Related Protein 2/3 Complex-Independent Polarization of the Centrosome to the Immunological Synapse journal February 2007
Transcellular Diapedesis Is Initiated by Invasive Podosomes journal June 2007
T Cell Costimulation via the Integrin VLA-4 Inhibits the Actin-Dependent Centralization of Signaling Microclusters Containing the Adaptor SLP-76 journal June 2008
Kinetics of Early T Cell Receptor Signaling Regulate the Pathway of Lytic Granule Delivery to the Secretory Domain journal October 2009
Actin Depletion Initiates Events Leading to Granule Secretion at the Immunological Synapse journal May 2015
Cytotoxic T lymphocyte mediated lysis without release of serine esterase journal November 1987
Centrosome polarization delivers secretory granules to the immunological synapse journal September 2006
Characterization of two classes of small molecule inhibitors of Arp2/3 complex journal August 2009
T cell killing does not require the formation of a stable mature immunological synapse journal March 2004
Imaging techniques for assaying lymphocyte activation in action journal December 2010
The ARP2/3 complex: an actin nucleator comes of age journal October 2006
Cytotoxic T lymphocytes kill multiple targets simultaneously via spatiotemporal uncoupling of lytic and stimulatory synapses journal July 2006
Mechanisms for segregating T cell receptor and adhesion molecules during immunological synapse formation in Jurkat T cells journal December 2007
CD4+ T-cell synapses involve multiple distinct stages journal September 2011
Diacylglycerol promotes centrosome polarization in T cells via reciprocal localization of dynein and myosin II journal July 2013
CD28 and CD3 have complementary roles in T-cell traction forces journal January 2014
Three-dimensional localization of T-cell receptors in relation to microvilli using a combination of superresolution microscopies journal September 2016
Cortical actin recovery at the immunological synapse leads to termination of lytic granule secretion in cytotoxic T lymphocytes journal July 2017
The WAVE2 complex regulates T cell receptor signaling to integrins via Abl- and CrkL–C3G-mediated activation of Rap1 journal September 2008
Formin-generated actomyosin arcs propel T cell receptor microcluster movement at the immune synapse journal October 2016
Annular PIP 3 accumulation controls actin architecture and modulates cytotoxicity at the immunological synapse journal November 2013
Antigen Receptor–Induced Activation and Cytoskeletal Rearrangement Are Impaired in Wiskott-Aldrich Syndrome Protein–Deficient Lymphocytes journal November 1999
Annular PIP 3 accumulation controls actin architecture and modulates cytotoxicity at the immunological synapse journal November 2013
The WAVE2 complex regulates T cell receptor signaling to integrins via Abl- and CrkL–C3G-mediated activation of Rap1 journal September 2008
Annular PIP 3 accumulation controls actin architecture and modulates cytotoxicity at the immunological synapse journal November 2013
Actin retrograde flow and actomyosin II arc contraction drive receptor cluster dynamics at the immunological synapse in Jurkat T cells journal March 2012
Actin retrograde flow and actomyosin II arc contraction drive receptor cluster dynamics at the immunological synapse in Jurkat T cells journal March 2012
Cell:cell interactions in the immune system journal December 2012
Cytotoxic immunological synapses: NK and CTL synapses journal April 2010
Wiskott-Aldrich syndrome: a comprehensive review: Wiskott-Aldrich syndrome journal March 2013
Lattice light-sheet microscopy: Imaging molecules to embryos at high spatiotemporal resolution journal October 2014
Visualizing dynamic microvillar search and stabilization during ligand detection by T cells journal May 2017
Diacylglycerol kinase   establishes T cell polarity by shaping diacylglycerol accumulation at the immunological synapse journal August 2014
Secretory Mechanisms in Cell-Mediated Cytotoxicity journal November 2007
How Do Cytotoxic Lymphocytes Kill Cancer Cells? journal November 2015
Cytoskeletal remodeling mediated by WASp in dendritic cells is necessary for normal immune synapse formation and T-cell priming journal September 2011
Abnormalities of follicular helper T-cell number and function in Wiskott-Aldrich syndrome journal June 2016
Wiskott-Aldrich syndrome protein is necessary for efficient IgG-mediated phagocytosis journal May 2000
The Wiskott-Aldrich syndrome protein regulates CTL cytotoxicity and is required for efficient killing of B cell lymphoma targets journal August 2010
WASp-dependent actin cytoskeleton stability at the dendritic cell immunological synapse is required for extensive, functional T cell contacts journal November 2015
Natural Killer Cell Lytic Granule Secretion Occurs through a Pervasive Actin Network at the Immune Synapse journal September 2011
Remodelling of Cortical Actin Where Lytic Granules Dock at Natural Killer Cell Immune Synapses Revealed by Super-Resolution Microscopy journal September 2011
Force Generation upon T Cell Receptor Engagement journal May 2011
The Variable Hinge Region of Novel PKCs Determines Localization to Distinct Regions of the Immunological Synapse journal April 2014
Actin retrograde flow and actomyosin II arc contraction drive receptor cluster dynamics at the immunological synapse in Jurkat T cells text January 2012
Cortical actin recovery at the immunological synapse leads to termination of lytic granule secretion in cytotoxic T lymphocytes. text January 2017
The Wiskott-Aldrich syndrome protein permits assembly of a focused immunological synapse enabling sustained T-cell receptor signaling journal June 2011
Docking of Lytic Granules at the Immunological Synapse in Human CTL Requires Vti1b-Dependent Pairing with CD3 Endosomes journal May 2011
Antigen Recognition Is Facilitated by Invadosome-like Protrusions Formed by Memory/Effector T Cells journal March 2012
Cutting Edge: The Wiskott-Aldrich Syndrome Protein Is Required for Efficient Phagocytosis of Apoptotic Cells journal April 2001
Differential Roles for Wiskott-Aldrich Syndrome Protein in Immune Synapse Formation and IL-2 Production journal July 2004
Actin foci facilitate activation of the phospholipase C-γ in primary T lymphocytes via the WASP pathway journal March 2015

Cited By (4)

Loss of ARPC1B impairs cytotoxic T lymphocyte maintenance and cytolytic activity. text January 2019
Actin Cytoskeleton Straddling the Immunological Synapse between Cytotoxic Lymphocytes and Cancer Cells journal May 2019
Mechanotransduction in T Cell Development, Differentiation and Function journal February 2020
Loss of ARPC1B impairs cytotoxic T lymphocyte maintenance and cytolytic activity journal October 2019

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