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Velnati S, Centonze S, Rossino G, Purghè B, Antona A, Racca L, Mula S, Ruffo E, Malacarne V, Malerba M, Manfredi M, Graziani A, Baldanzi G. Wiskott-Aldrich syndrome protein interacts and inhibits diacylglycerol kinase alpha promoting IL-2 induction. Front Immunol 2023; 14:1043603. [PMID: 37138877 PMCID: PMC10149931 DOI: 10.3389/fimmu.2023.1043603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 03/30/2023] [Indexed: 05/05/2023] Open
Abstract
Background Phosphorylation of diacylglycerol by diacylglycerol-kinases represents a major inhibitory event constraining T cell activation upon antigen engagement. Efficient TCR signalling requires the inhibition of the alpha isoform of diacylglycerol kinase, DGKα, by an unidentified signalling pathway triggered by the protein adaptor SAP. We previously demonstrated that, in SAP absence, excessive DGKα activity makes the T cells resistant to restimulation-induced cell death (RICD), an apoptotic program counteracting excessive T cell clonal expansion. Results Herein, we report that the Wiskott-Aldrich syndrome protein (WASp) inhibits DGKα through a specific interaction of the DGKα recoverin homology domain with the WH1 domain of WASp. Indeed, WASp is necessary and sufficient for DGKα inhibition, and this WASp function is independent of ARP2/3 activity. The adaptor protein NCK-1 and the small G protein CDC42 connect WASp-mediated DGKα inhibition to SAP and the TCR signalosome. In primary human T cells, this new signalling pathway is necessary for a full response in terms of IL-2 production, while minimally affecting TCR signalling and restimulation-induced cell death. Conversely, in T cells made resistant to RICD by SAP silencing, the enhanced DAG signalling due to DGKα inhibition is sufficient to restore apoptosis sensitivity. Conclusion We discover a novel signalling pathway where, upon strong TCR activation, the complex between WASp and DGKα blocks DGKα activity, allowing a full cytokine response.
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Affiliation(s)
- Suresh Velnati
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), Università del Piemonte Orientale, Novara, Italy
| | - Sara Centonze
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), Università del Piemonte Orientale, Novara, Italy
- Department of Heath Sciences, Università del Piemonte Orientale, Novara, Italy
- *Correspondence: Sara Centonze,
| | - Giulia Rossino
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center (MBC), University of Turin, Turin, Italy
| | - Beatrice Purghè
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), Università del Piemonte Orientale, Novara, Italy
| | - Annamaria Antona
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
| | - Luisa Racca
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), Università del Piemonte Orientale, Novara, Italy
| | - Sabrina Mula
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center (MBC), University of Turin, Turin, Italy
| | - Elisa Ruffo
- Department of Surgery and Immunology, University of Pittsburgh, Pittsburgh, PA, United States
| | - Valeria Malacarne
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center (MBC), University of Turin, Turin, Italy
| | - Mario Malerba
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Respiratory Unit, Sant’Andrea Hospital, Vercelli, Italy
| | - Marcello Manfredi
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), Università del Piemonte Orientale, Novara, Italy
| | - Andrea Graziani
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center (MBC), University of Turin, Turin, Italy
| | - Gianluca Baldanzi
- Department of Translational Medicine, Universitàdel Piemonte Orientale, Novara, Italy
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), Università del Piemonte Orientale, Novara, Italy
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Ochiai S, Hayakawa I, Ohashi E, Hamano S, Miyata Y, Sakuma H, Hogetsu K, Gocho Y, Ogura M, Uchiyama T, Abe Y. Fatal X-linked lymphoproliferative disease type 1-associated limbic encephalitis with positive anti-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor antibody. Brain Dev 2022; 44:630-634. [PMID: 35778314 DOI: 10.1016/j.braindev.2022.06.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/31/2022] [Accepted: 06/15/2022] [Indexed: 11/16/2022]
Abstract
BACKGROUND X-linked lymphoproliferative disease type 1 (XLP1) is a rare monogenic immune dysregulation disorder caused by a deficiency of a signaling lymphocyte activation molecule-associated protein (SAP). While many patients with XLP1 present with fatal hemophagocytic lymphohistiocytosis upon Epstein Barr virus (EBV) infection, a small fraction present with limbic encephalitis in the absence of EBV infection. It is poorly understood why SAP deficiency may cause limbic encephalitis in XLP1. CASE A 12-year-old boy presented with seizures, changes in personality, memory loss, and cognitive deficits during treatment for interstitial pneumonia. A diagnosis of limbic encephalitis was made. Despite treatment against CD8+ T cell-mediated autoimmunity with intravenous methylprednisolone, dexamethasone, intravenous immunoglobulin, plasma exchange, cyclosporine, weekly etoposide, mycophenolate mofetil, and adalimumab, encephalitis progressed until the patient died after one month of treatment intitiation. Post-mortem genetic testing revealed a de novo SH2D1A truncating mutation. Tests for EBV infection were negative. Initial spinal fluid revealed markedly elevated protein levels, mild pleocytosis, and elevation of two chemokines (C-X-C motif chemokine ligand [CXCL] 10 and CXCL 13). Moreover, initial spinal fluid was tested positive for anti-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) autoantibody. DISCUSSION In XLP1-associated limbic encephalitis, anti-AMPAR autoantibody production by the dysregulated immune system due to SAP deficiency might be a pathogenic mechanism of central nervous system manifestations. In addition to the standard treatment for XLP1, targeted treatment against B-cell-mediated immunity might be indicated for patients with XLP1-associated limbic encephalitis.
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Affiliation(s)
- Satoru Ochiai
- Division of Neurology, National Center for Child Health and Development, Tokyo, Japan; Department of Pediatrics, Teikyo University, Tokyo, Japan
| | - Itaru Hayakawa
- Division of Neurology, National Center for Child Health and Development, Tokyo, Japan; Department of Pediatrics, University of Tokyo, Tokyo, Japan.
| | - Eri Ohashi
- Division of Neurology, National Center for Child Health and Development, Tokyo, Japan
| | - Sho Hamano
- Department of Pediatrics, Kyorin University School of Medicine, Tokyo, Japan
| | - Yohane Miyata
- Department of Pediatrics, Kyorin University School of Medicine, Tokyo, Japan
| | - Hiroshi Sakuma
- Department of Brain & Neurosciences, Tokyo Metropolitan Institute of Medical Sciences, Tokyo, Japan
| | - Keita Hogetsu
- Children's Cancer Center, National Center for Child Health and Development, Tokyo, Japan
| | - Yoshihiro Gocho
- Children's Cancer Center, National Center for Child Health and Development, Tokyo, Japan
| | - Masao Ogura
- Department of Nephrology, National Center for Child Health and Development, Tokyo, Japan
| | - Toru Uchiyama
- Department of Human Genetics, National Center for Child Health and Development, Tokyo, Japan
| | - Yuichi Abe
- Division of Neurology, National Center for Child Health and Development, Tokyo, Japan
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Centonze S, Baldanzi G. Diacylglycerol Kinases in Signal Transduction. Int J Mol Sci 2022; 23:ijms23158423. [PMID: 35955558 PMCID: PMC9369165 DOI: 10.3390/ijms23158423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Accepted: 07/27/2022] [Indexed: 11/25/2022] Open
Affiliation(s)
- Sara Centonze
- Department of Translational Medicine, University of Piemonte Orientale, 28100 Novara, Italy;
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), University of Piemonte Orientale, 28100 Novara, Italy
| | - Gianluca Baldanzi
- Department of Translational Medicine, University of Piemonte Orientale, 28100 Novara, Italy;
- Center for Translational Research on Allergic and Autoimmune Diseases (CAAD), University of Piemonte Orientale, 28100 Novara, Italy
- Correspondence: ; Tel.: +39-0321-660-527
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Takahashi D, Yonezawa K, Okizaki Y, Caaveiro JMM, Ueda T, Shimada A, Sakane F, Shimizu N. Ca 2+ -induced structural changes and intramolecular interactions in N-terminal region of diacylglycerol kinase alpha. Protein Sci 2022; 31:e4365. [PMID: 35762720 PMCID: PMC9202544 DOI: 10.1002/pro.4365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 05/09/2022] [Accepted: 05/27/2022] [Indexed: 11/05/2022]
Abstract
Diacylglycerol kinases (DGKs) are multi-domain lipid kinases that modulate the levels of lipid messengers, diacylglycerol, and phosphatidic acid. Recently, increasing attention has been paid to its α isozyme (DGKα) as a potential target for cancer immunotherapy. However, little progress has been made on the structural biology of DGKs, and a detailed understanding of the Ca2+ -triggered activation of DGKα, for which the N-terminal domains likely play a critical role, remains unclear. We have recently shown that Ca2+ binding to DGKα-EF induces conformational changes from a protease-susceptible "open" conformation in the apo state to a well-folded one in its holo state. Here, we further studied the structural properties of DGKα N-terminal (RVH and EF) domains using a series of biophysical techniques. We first revealed that the N-terminal RVH domain is a novel Ca2+ -binding domain, but the Ca2+ -induced conformational changes mainly occur in the EF domain. This was corroborated by NMR experiments showing that the EF domain adopts a molten-globule like structure in the apo state. Further analyses using SEC-SAXS and NMR indicate that the partially unfolded EF domain interacts with RVH domain, likely via hydrophobic interactions in the absence of Ca2+ , and this interaction is modified in the presence of Ca2+ . Taken together, these results present novel insights into the structural rearrangement of DGKα N-terminal domains upon binding to Ca2+ , which is essential for the activation of the enzyme.
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Affiliation(s)
- Daisuke Takahashi
- Department of Protein Structure, Function, and Design, Graduate School of Pharmaceutical ScienceKyushu UniversityFukuokaJapan
| | - Kento Yonezawa
- Photon Factory, Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)TsukubaJapan
- Center for Digital Green‐Innovation (CDG)Nara Institute of Science and Technology (NAIST)IkomaJapan
| | - Yuki Okizaki
- Department of Protein Structure, Function, and Design, Graduate School of Pharmaceutical ScienceKyushu UniversityFukuokaJapan
| | - Jose M. M. Caaveiro
- Department of Global Healthcare, Graduate School of Pharmaceutical ScienceKyushu UniversityFukuokaJapan
| | - Tadashi Ueda
- Department of Protein Structure, Function, and Design, Graduate School of Pharmaceutical ScienceKyushu UniversityFukuokaJapan
| | - Atsushi Shimada
- Division of Structural Biology, Medical Institute of BioregulationKyushu UniversityFukuokaJapan
| | - Fumio Sakane
- Department of Chemistry, Graduate School of ScienceChiba UniversityChibaJapan
| | - Nobutaka Shimizu
- Photon Factory, Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)TsukubaJapan
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