Human NK Cell Cytoskeletal Dynamics and Cytotoxicity Are Regulated by LIM Kinase
NK cells provide immune surveillance and host protection against viruses and tumors through their cytotoxic effector function. Cytoskeletal rearrangement is necessary for NK cell lytic granule trafficking and immune synapse formation to trigger apoptosis of targeted cells. LIM kinase (LIMK) regulate...
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Published in | The Journal of immunology (1950) Vol. 205; no. 3; pp. 801 - 810 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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01.08.2020
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Abstract | NK cells provide immune surveillance and host protection against viruses and tumors through their cytotoxic effector function. Cytoskeletal rearrangement is necessary for NK cell lytic granule trafficking and immune synapse formation to trigger apoptosis of targeted cells. LIM kinase (LIMK) regulates F-actin remodeling by phosphorylating cofilin to inhibit actin severing and depolymerization. In this study, in human NK cells, the glucocorticoid dexamethasone downregulated LIMK expression, F-actin accumulation at the immune synapse, lytic granule trafficking, and cytotoxicity. In contrast, the specialized proresolving mediator lipoxin A
promoted NK cell LIMK expression, lytic granule polarization to the immune synapse and cytotoxicity. Using a LIMK inhibitor, we show that LIMK activity is necessary for NK cell cytotoxicity, including lipoxin A
's proresolving actions. Together, our findings identify LIMK as an important control mechanism for NK cell cytoskeletal rearrangement that is differentially regulated by glucocorticoids and specialized proresolving mediators to influence NK cell cytotoxicity. |
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AbstractList | NK cells provide immune surveillance and host protection against viruses and tumors through their cytotoxic effector function. Cytoskeletal rearrangement is necessary for NK cell lytic granule trafficking and immune synapse formation to trigger apoptosis of targeted cells. LIM kinase (LIMK) regulates F-actin remodeling by phosphorylating cofilin to inhibit actin severing and depolymerization. In this study, in human NK cells, the glucocorticoid dexamethasone downregulated LIMK expression, F-actin accumulation at the immune synapse, lytic granule trafficking, and cytotoxicity. In contrast, the specialized proresolving mediator lipoxin A4 promoted NK cell LIMK expression, lytic granule polarization to the immune synapse and cytotoxicity. Using a LIMK inhibitor, we show that LIMK activity is necessary for NK cell cytotoxicity, including lipoxin A4’s proresolving actions. Together, our findings identify LIMK as an important control mechanism for NK cell cytoskeletal rearrangement that is differentially regulated by glucocorticoids and specialized proresolving mediators to influence NK cell cytotoxicity. NK cells provide immune surveillance and host protection against viruses and tumors through their cytotoxic effector function. Cytoskeletal rearrangement is necessary for NK cell lytic granule trafficking and immune synapse formation to trigger apoptosis of targeted cells. LIM kinase (LIMK) regulates F-actin remodeling by phosphorylating cofilin to inhibit actin severing and depolymerization. In this study, in human NK cells, the glucocorticoid dexamethasone downregulated LIMK expression, F-actin accumulation at the immune synapse, lytic granule trafficking, and cytotoxicity. In contrast, the specialized proresolving mediator lipoxin A promoted NK cell LIMK expression, lytic granule polarization to the immune synapse and cytotoxicity. Using a LIMK inhibitor, we show that LIMK activity is necessary for NK cell cytotoxicity, including lipoxin A 's proresolving actions. Together, our findings identify LIMK as an important control mechanism for NK cell cytoskeletal rearrangement that is differentially regulated by glucocorticoids and specialized proresolving mediators to influence NK cell cytotoxicity. |
Author | Fuhlbrigge, Mary E Walker, Katherine H Kılıç, Ayşe Reilly, Roisin B Levy, Bruce D Duvall, Melody G |
Author_xml | – sequence: 1 givenname: Melody G orcidid: 0000-0002-4173-3628 surname: Duvall fullname: Duvall, Melody G organization: Division of Critical Care Medicine, Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115; and – sequence: 2 givenname: Mary E surname: Fuhlbrigge fullname: Fuhlbrigge, Mary E organization: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115 – sequence: 3 givenname: Roisin B orcidid: 0000-0001-8628-4080 surname: Reilly fullname: Reilly, Roisin B organization: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115 – sequence: 4 givenname: Katherine H orcidid: 0000-0003-1198-8125 surname: Walker fullname: Walker, Katherine H organization: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115 – sequence: 5 givenname: Ayşe surname: Kılıç fullname: Kılıç, Ayşe organization: Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115 – sequence: 6 givenname: Bruce D orcidid: 0000-0001-9515-5731 surname: Levy fullname: Levy, Bruce D email: blevy@bwh.harvard.edu organization: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115; blevy@bwh.harvard.edu |
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SubjectTerms | Cytoskeleton - immunology Dexamethasone - pharmacology Humans Killer Cells, Natural - immunology Lim Kinases - immunology Lipoxins - antagonists & inhibitors Lipoxins - immunology |
Title | Human NK Cell Cytoskeletal Dynamics and Cytotoxicity Are Regulated by LIM Kinase |
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