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Ningoo M, Cruz-Encarnación P, Khilnani C, Heeger PS, Fribourg M. T-cell receptor sequencing reveals selected donor-reactive CD8 + T cell clones resist antithymocyte globulin depletion after kidney transplantation. Am J Transplant 2024; 24:755-764. [PMID: 38141722 PMCID: PMC11070313 DOI: 10.1016/j.ajt.2023.12.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 11/21/2023] [Accepted: 12/19/2023] [Indexed: 12/25/2023]
Abstract
High frequencies of donor-reactive memory T cells in the periphery of transplant candidates prior to transplantation are linked to the development of posttransplant acute rejection episodes and reduced allograft function. Rabbit antithymocyte globulin (rATG) effectively depletes naïve CD4+ and CD8+ T cells for >6 months posttransplant, but rATG's effects on human donor-reactive T cells have not been carefully determined. To address this, we performed T cell receptor β-chain sequencing on peripheral blood mononuclear cells aliquots collected pretransplant and serially posttransplant in 7 kidney transplant recipients who received rATG as induction therapy. We tracked the evolution of the donor-reactive CD4+ and CD8+ T cell repertoires and identified stimulated pretransplant, CTV-(surface dye)-labeled, peripheral blood mononuclear cells from each patient with donor cells or third-party cells. Our analyses showed that while rATG depleted CD4+ T cells in all tested subjects, a subset of donor-reactive CD8+ T cells that were present at high frequencies pretransplant, consistent with expanded memory cells, resisted rATG depletion, underwent posttransplant expansion and were functional. Together, our data support the conclusion that a subset of human memory CD8+ T cells specifically reactive to donor antigens expand in vivo despite induction therapy with rATG and thus have the potential to mediate allograft damage.
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Affiliation(s)
- Mehek Ningoo
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Pamela Cruz-Encarnación
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Calla Khilnani
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Peter S Heeger
- Comprehensive Transplant Center, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Miguel Fribourg
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York, New York, USA.
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Fueyo-González F, Vilanova G, Ningoo M, Marjanovic N, González-Vera JA, Orte Á, Fribourg M. Small-molecule TIP60 inhibitors enhance regulatory T cell induction through TIP60-P300 acetylation crosstalk. iScience 2023; 26:108491. [PMID: 38094248 PMCID: PMC10716589 DOI: 10.1016/j.isci.2023.108491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 08/12/2023] [Accepted: 11/14/2023] [Indexed: 12/29/2023] Open
Abstract
Foxp3 acetylation is essential to regulatory T (Treg) cell stability and function, but pharmacologically increasing it remains an unmet challenge. Here, we report that small-molecule compounds that inhibit TIP60, an acetyltransferase known to acetylate Foxp3, unexpectedly increase Foxp3 acetylation and Treg induction. Utilizing a dual experimental/computational approach combined with a newly developed FRET-based methodology compatible with flow cytometry to measure Foxp3 acetylation, we unraveled the mechanism of action of these small-molecule compounds in murine and human Treg induction cell cultures. We demonstrate that at low-mid concentrations they activate TIP60 to acetylate P300, a different acetyltransferase, which in turn increases Foxp3 acetylation, thereby enhancing Treg cell induction. These results reveal a potential therapeutic target relevant to autoimmunity and transplant.
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Affiliation(s)
- Francisco Fueyo-González
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Immunology Institute Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Guillermo Vilanova
- LaCàN, Universitat Politècnica de Catalunya-BarcelonaTech, 08034 Barcelona Spain
| | - Mehek Ningoo
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Immunology Institute Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Nada Marjanovic
- Deparment of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Juan A. González-Vera
- Deparment of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Nanoscopy-UGR Laboratory, Departamento de Fisicoquímica, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071 Granada, Spain
| | - Ángel Orte
- Deparment of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Nanoscopy-UGR Laboratory, Departamento de Fisicoquímica, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071 Granada, Spain
| | - Miguel Fribourg
- Translational Transplant Research Center, Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Immunology Institute Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
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Fueyo-González F, McGinty M, Ningoo M, Anderson L, Cantarelli C, Andrea Angeletti, Demir M, Llaudó I, Purroy C, Marjanovic N, Heja D, Sealfon SC, Heeger PS, Cravedi P, Fribourg M. Interferon-β acts directly on T cells to prolong allograft survival by enhancing regulatory T cell induction through Foxp3 acetylation. Immunity 2022; 55:459-474.e7. [PMID: 35148827 PMCID: PMC8917088 DOI: 10.1016/j.immuni.2022.01.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 06/18/2021] [Accepted: 01/13/2022] [Indexed: 12/19/2022]
Abstract
Type I interferons (IFNs) are pleiotropic cytokines with potent antiviral properties that also promote protective T cell and humoral immunity. Paradoxically, type I IFNs, including the widely expressed IFNβ, also have immunosuppressive properties, including promoting persistent viral infections and treating T-cell-driven, remitting-relapsing multiple sclerosis. Although associative evidence suggests that IFNβ mediates these immunosuppressive effects by impacting regulatory T (Treg) cells, mechanistic links remain elusive. Here, we found that IFNβ enhanced graft survival in a Treg-cell-dependent murine transplant model. Genetic conditional deletion models revealed that the extended allograft survival was Treg cell-mediated and required IFNβ signaling on T cells. Using an in silico computational model and analysis of human immune cells, we found that IFNβ directly promoted Treg cell induction via STAT1- and P300-dependent Foxp3 acetylation. These findings identify a mechanistic connection between the immunosuppressive effects of IFNβ and Treg cells, with therapeutic implications for transplantation, autoimmunity, and malignancy.
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Affiliation(s)
- Francisco Fueyo-González
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Mitchell McGinty
- Carter Immunology Center, University of Virginia, Charlottesville, VA 22903, USA
| | - Mehek Ningoo
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Lisa Anderson
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Chiara Cantarelli
- UO Nefrologia, Azienda Ospedaliero-Universitaria Parma, Parma, Italy
| | - Andrea Angeletti
- Division of Nephrology, Dialysis, Transplantation, IRCCS Giannina Gaslini, Genoa, Italy
| | - Markus Demir
- Department of Anesthesiology, University of Cologne, Cologne, Germany
| | - Inés Llaudó
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Carolina Purroy
- Department of Nephrology, Complejo Hospitalario de Navarra, Navarra, Spain
| | - Nada Marjanovic
- Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Department of Neurology, Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - David Heja
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Stuart C Sealfon
- Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Department of Neurology, Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Peter S Heeger
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Paolo Cravedi
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA
| | - Miguel Fribourg
- Division of Nephrology, Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York City, NY, USA; Immunology Institute Icahn School of Medicine at Mount Sinai, New York City, NY, USA.
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Ningoo M, Plant LD, Greka A, Logothetis DE. PIP 2 regulation of TRPC5 channel activation and desensitization. J Biol Chem 2021; 296:100726. [PMID: 33933453 PMCID: PMC8191310 DOI: 10.1016/j.jbc.2021.100726] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 04/20/2021] [Accepted: 04/28/2021] [Indexed: 10/27/2022] Open
Abstract
Transient receptor potential canonical type 5 (TRPC5) ion channels are expressed in the brain and kidney and have been identified as promising therapeutic targets whose selective inhibition can protect against diseases driven by a leaky kidney filter, such as focal segmental glomerular sclerosis. TRPC5 channels are activated not only by elevated levels of extracellular Ca2+or lanthanide ions but also by G protein (Gq/11) stimulation. Phosphatidylinositol 4,5-bisphosphate (PIP2) hydrolysis by phospholipase C enzymes leads to PKC-mediated phosphorylation of TRPC5 channels and their subsequent desensitization. However, the roles of PIP2 in activation and maintenance of TRPC5 channel activity via its hydrolysis product diacyl glycerol (DAG), as well as the mechanism of desensitization of TRPC5 activity by DAG-stimulated PKC activity, remain unclear. Here, we designed experiments to distinguish between the processes underlying channel activation and inhibition. Employing whole-cell patch-clamp, we used an optogenetic tool to dephosphorylate PIP2 and assess channel-PIP2 interactions influenced by activators, such as DAG, or inhibitors, such as PKC phosphorylation. Using total internal reflection microscopy, we assessed channel cell surface density. We show that PIP2 controls both the PKC-mediated inhibition and the DAG- and lanthanide-mediated activation of TRPC5 currents via control of gating rather than channel cell surface density. These mechanistic insights promise to aid in the development of more selective and precise inhibitors to block TRPC5 channel activity and illuminate new opportunities for targeted therapies for a group of chronic kidney diseases for which there is currently a great unmet need.
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Affiliation(s)
- Mehek Ningoo
- Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts, USA
| | - Leigh D Plant
- Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts, USA; Center for Drug Discovery, Northeastern University, Boston, Massachusetts, USA
| | - Anna Greka
- Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA; Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | - Diomedes E Logothetis
- Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts, USA; Center for Drug Discovery, Northeastern University, Boston, Massachusetts, USA; Department of Chemistry and Chemical Biology, College of Science, Northeastern University, Boston, Massachusetts, USA.
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