{"id":{"repo_id":"utswmed","oai_identifier":"oai:utswmed-ir.tdl.org:2152.5/1587"},"canonical_url":"https://search.dev.ndltd.org/etd/utswmed/oai:utswmed-ir.tdl.org:2152.5/1587","repository":{"repo_id":"utswmed","name":"University of Texas Southwestern Medical Center","base_url":"https://utswmed-ir.tdl.org/server/oai/request"},"display":{"title":"Actin Regulatory Dynamics Required for T Cell Activation: A Quantitative and Systems-Level Perspective","abstract":"T cell activation occurs through interaction with an antigen-presenting cell (APC). Upon activation, signaling ensues with the coordination of dozens of diverse signaling molecules in space and time, a feature of cell signaling we call ‘spatiotemporal patterning’. We performed a systems-scale analysis of the spatiotemporal patterning of T cell signaling and have found that it is highly diverse. Over 50 signaling sensors were imaged in live primary T cells activated with APCs under various physiological stimulation conditions, and no two signaling intermediates showed the same dynamic localization. The activation environment controlled spatiotemporal features of T cell signaling and specific spatiotemporal features correlated with efficient T cell activation. To identify underlying cell biological mechanisms controlling spatiotemporal organization of signaling, we complimented our live cell imaging with microscopy across multiple scales and identified a dense transient F-actin network that extends from a highly interdigitated T cell:APC interface several micrometers deep into the T cell lamellum. Systems-scale imaging revealed a large network of proximal T cell signaling intermediates that localized to the lamellal actin network and shared the spatial, temporal, and mobility features of F-actin. Interference with lamellal actin dynamics modulated the activity of the associated proteins and impaired IL-2 production. These data strongly suggest that the transient deep F-actin network by controlling lamellal localization modulates the activity of a substantial part of the T cell signal transduction system. As a next step in understanding how spatiotemporal dynamics of signaling controls T cell activation, we have developed a quantitative 4D analysis approach for signaling networks and coupled it with traditional cell biological techniques to uncover higher order mechanisms of the control of actin dynamics by CD28 co-stimulation during T cell activation. A group of nine actin regulatory proteins that mediate actin polymerization, capping, and severing were assessed and CD28 co-stimulation was required for their sustained activity at the T cell:APC interface. WAVE2 and Cofilin were especially sensitive to blockade of CD28 signaling. Functional relevance of the loss of WAVE2 and Cofilin enrichment was shown by the treatment of T cells with constitutively active Rac1 and Cofilin, which bypassed the requirement of co-stimulation for normal actin dynamics and AKT activation. This study highlights how a systems analysis of actin regulation could identify mechanisms that are inaccessible to more traditional single protein/gene approaches.","abstract_html":"T cell activation occurs through interaction with an antigen-presenting cell (APC). Upon activation, signaling ensues with the coordination of dozens of diverse signaling molecules in space and time, a feature of cell signaling we call ‘spatiotemporal patterning’. We performed a systems-scale analysis of the spatiotemporal patterning of T cell signaling and have found that it is highly diverse. Over 50 signaling sensors were imaged in live primary T cells activated with APCs under various physiological stimulation conditions, and no two signaling intermediates showed the same dynamic localization. The activation environment controlled spatiotemporal features of T cell signaling and specific spatiotemporal features correlated with efficient T cell activation. To identify underlying cell biological mechanisms controlling spatiotemporal organization of signaling, we complimented our live cell imaging with microscopy across multiple scales and identified a dense transient F-actin network that extends from a highly interdigitated T cell:APC interface several micrometers deep into the T cell lamellum. Systems-scale imaging revealed a large network of proximal T cell signaling intermediates that localized to the lamellal actin network and shared the spatial, temporal, and mobility features of F-actin. Interference with lamellal actin dynamics modulated the activity of the associated proteins and impaired IL-2 production. These data strongly suggest that the transient deep F-actin network by controlling lamellal localization modulates the activity of a substantial part of the T cell signal transduction system. As a next step in understanding how spatiotemporal dynamics of signaling controls T cell activation, we have developed a quantitative 4D analysis approach for signaling networks and coupled it with traditional cell biological techniques to uncover higher order mechanisms of the control of actin dynamics by CD28 co-stimulation during T cell activation. A group of nine actin regulatory proteins that mediate actin polymerization, capping, and severing were assessed and CD28 co-stimulation was required for their sustained activity at the T cell:APC interface. WAVE2 and Cofilin were especially sensitive to blockade of CD28 signaling. Functional relevance of the loss of WAVE2 and Cofilin enrichment was shown by the treatment of T cells with constitutively active Rac1 and Cofilin, which bypassed the requirement of co-stimulation for normal actin dynamics and AKT activation. This study highlights how a systems analysis of actin regulation could identify mechanisms that are inaccessible to more traditional single protein/gene approaches.","abstract_has_math":false,"creators":["Roybal, Kole Thomas 1982-"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Ward, E. Sally","Wülfing, Christoph","Rosen, Michael K.","Pasare, Chandrashekhar"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-06-01T20:10:08Z","date_published":"2015-06-01T20:10:08Z","updated_at":"2026-07-24T05:52:20Z","subjects":["Actins","Signal Transduction","T-Lymphocytes"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2152.5/1587","910559209"],"render_values":[{"text":"https://hdl.handle.net/2152.5/1587","href":"https://hdl.handle.net/2152.5/1587","code":true},{"text":"910559209","href":null,"code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/2152.5/ETD-UTSWMED-2013-05-91","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ward, E. 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Upon activation, signaling ensues with the coordination of dozens of diverse signaling molecules in space and time, a feature of cell signaling we call ‘spatiotemporal patterning’. We performed a systems-scale analysis of the spatiotemporal patterning of T cell signaling and have found that it is highly diverse. Over 50 signaling sensors were imaged in live primary T cells activated with APCs under various physiological stimulation conditions, and no two signaling intermediates showed the same dynamic localization. The activation environment controlled spatiotemporal features of T cell signaling and specific spatiotemporal features correlated with efficient T cell activation. To identify underlying cell biological mechanisms controlling spatiotemporal organization of signaling, we complimented our live cell imaging with microscopy across multiple scales and identified a dense transient F-actin network that extends from a highly interdigitated T cell:APC interface several micrometers deep into the T cell lamellum. Systems-scale imaging revealed a large network of proximal T cell signaling intermediates that localized to the lamellal actin network and shared the spatial, temporal, and mobility features of F-actin. Interference with lamellal actin dynamics modulated the activity of the associated proteins and impaired IL-2 production. These data strongly suggest that the transient deep F-actin network by controlling lamellal localization modulates the activity of a substantial part of the T cell signal transduction system. As a next step in understanding how spatiotemporal dynamics of signaling controls T cell activation, we have developed a quantitative 4D analysis approach for signaling networks and coupled it with traditional cell biological techniques to uncover higher order mechanisms of the control of actin dynamics by CD28 co-stimulation during T cell activation. A group of nine actin regulatory proteins that mediate actin polymerization, capping, and severing were assessed and CD28 co-stimulation was required for their sustained activity at the T cell:APC interface. WAVE2 and Cofilin were especially sensitive to blockade of CD28 signaling. Functional relevance of the loss of WAVE2 and Cofilin enrichment was shown by the treatment of T cells with constitutively active Rac1 and Cofilin, which bypassed the requirement of co-stimulation for normal actin dynamics and AKT activation. This study highlights how a systems analysis of actin regulation could identify mechanisms that are inaccessible to more traditional single protein/gene approaches."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Actin Regulatory Dynamics Required for T Cell Activation: A Quantitative and Systems-Level Perspective"]}]}],"canonical_facts":{"dc:contributor":["Ward, E. Sally","Wülfing, Christoph","Rosen, Michael K.","Pasare, Chandrashekhar"],"dc:creator":["Roybal, Kole Thomas 1982-"],"dc:date":["2015-06-01T20:10:08Z","2013-05","2013-02-04","May 2013","2015-06-01T20:09:41Z"],"dc:description":["T cell activation occurs through interaction with an antigen-presenting cell (APC). Upon activation, signaling ensues with the coordination of dozens of diverse signaling molecules in space and time, a feature of cell signaling we call ‘spatiotemporal patterning’. We performed a systems-scale analysis of the spatiotemporal patterning of T cell signaling and have found that it is highly diverse. Over 50 signaling sensors were imaged in live primary T cells activated with APCs under various physiological stimulation conditions, and no two signaling intermediates showed the same dynamic localization. The activation environment controlled spatiotemporal features of T cell signaling and specific spatiotemporal features correlated with efficient T cell activation. To identify underlying cell biological mechanisms controlling spatiotemporal organization of signaling, we complimented our live cell imaging with microscopy across multiple scales and identified a dense transient F-actin network that extends from a highly interdigitated T cell:APC interface several micrometers deep into the T cell lamellum. Systems-scale imaging revealed a large network of proximal T cell signaling intermediates that localized to the lamellal actin network and shared the spatial, temporal, and mobility features of F-actin. Interference with lamellal actin dynamics modulated the activity of the associated proteins and impaired IL-2 production. These data strongly suggest that the transient deep F-actin network by controlling lamellal localization modulates the activity of a substantial part of the T cell signal transduction system. As a next step in understanding how spatiotemporal dynamics of signaling controls T cell activation, we have developed a quantitative 4D analysis approach for signaling networks and coupled it with traditional cell biological techniques to uncover higher order mechanisms of the control of actin dynamics by CD28 co-stimulation during T cell activation. A group of nine actin regulatory proteins that mediate actin polymerization, capping, and severing were assessed and CD28 co-stimulation was required for their sustained activity at the T cell:APC interface. WAVE2 and Cofilin were especially sensitive to blockade of CD28 signaling. Functional relevance of the loss of WAVE2 and Cofilin enrichment was shown by the treatment of T cells with constitutively active Rac1 and Cofilin, which bypassed the requirement of co-stimulation for normal actin dynamics and AKT activation. This study highlights how a systems analysis of actin regulation could identify mechanisms that are inaccessible to more traditional single protein/gene approaches."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2152.5/ETD-UTSWMED-2013-05-91","https://hdl.handle.net/2152.5/1587","910559209"],"dc:language":["en"],"dc:subject":["Actins","Signal Transduction","T-Lymphocytes"],"dc:title":["Actin Regulatory Dynamics Required for T Cell Activation: A Quantitative and Systems-Level Perspective"],"dc:type":["Thesis","Text"]},"updated_at":"2026-07-24T05:52:20Z"}