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Zabrodskaya Y, Tsvetkov V, Shurygina AP, Vasyliev K, Shaldzhyan A, Gorshkov A, Kuklin A, Fedorova N, Egorov V. How the immune mousetrap works: Structural evidence for the immunomodulatory action of a peptide from influenza NS1 protein. Biophys Chem 2024; 307:107176. [PMID: 38219420 DOI: 10.1016/j.bpc.2024.107176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 01/08/2024] [Indexed: 01/16/2024]
Abstract
One of the critical stages of the T-cell immune response is the dimerization of the intramembrane domains of T-cell receptors (TCR). Structural similarities between the immunosuppressive domains of viral proteins and the transmembrane domains of TCR have led several authors to hypothesize the mechanism of immune response suppression by highly pathogenic viruses: viral proteins embed themselves in the membrane and act on the intramembrane domain of the TCRalpha subunit, hindering its functional oligomerization. It has also been suggested that this mechanism is used by influenza A virus in NS1-mediated immunosuppression. We have shown that the peptide corresponding to the primary structure of the potential immunosuppressive domain of NS1 protein (G51) can reduce concanavalin A-induced proliferation of PBMC cells, as well as in vitro, G51 can affect the oligomerization of the core peptide corresponding to the intramembrane domain of TCR, using AFM and small-angle neutron scattering. The results obtained using in cellulo and in vitro model systems suggest the presence of functional interaction between the NS1 fragment and the intramembrane domain of the TCR alpha subunit. We have proposed a possible scheme for such interaction obtained by computer modeling. This suggests the existence of another NS1-mediated mechanism of immunosuppression in influenza.
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Affiliation(s)
- Yana Zabrodskaya
- Institute of Biomedical Systems and Biotechnology, Peter the Great Saint Petersburg Polytechnic University, 29 Ulitsa Polytechnicheskaya, St. Petersburg 194064, Russia; Smorodintsev Research Institute of Influenza, Russian Ministry of Health, 15/17 Ulitsa Prof. Popova, St. Petersburg 197376, Russia.
| | - Vladimir Tsvetkov
- Smorodintsev Research Institute of Influenza, Russian Ministry of Health, 15/17 Ulitsa Prof. Popova, St. Petersburg 197376, Russia; Federal Research and Clinical Center for Physical Chemical Medicine, 1a Ulitsa Malaya Pirogovskaya, Moscow 119435, Russia; Center for Mathematical Modeling in Drug Development, I.M. Sechenov First Moscow State Medical University, Moscow 119146, Russia
| | - Anna-Polina Shurygina
- Smorodintsev Research Institute of Influenza, Russian Ministry of Health, 15/17 Ulitsa Prof. Popova, St. Petersburg 197376, Russia
| | - Kirill Vasyliev
- Smorodintsev Research Institute of Influenza, Russian Ministry of Health, 15/17 Ulitsa Prof. Popova, St. Petersburg 197376, Russia
| | - Aram Shaldzhyan
- Smorodintsev Research Institute of Influenza, Russian Ministry of Health, 15/17 Ulitsa Prof. Popova, St. Petersburg 197376, Russia
| | - Andrey Gorshkov
- Smorodintsev Research Institute of Influenza, Russian Ministry of Health, 15/17 Ulitsa Prof. Popova, St. Petersburg 197376, Russia
| | - Alexander Kuklin
- International Intergovernmental Organization Joint Institute for Nuclear Research, 6 Ulitsa Joliot-Curie, Dubna 141980, Russia; Moscow Institute of Physics and Technology (State University), 9 Institutskiy pereulok, 141701 Dolgoprudny, Moscow Region, Russia
| | - Natalya Fedorova
- Petersburg Nuclear Physics Institute Named by B. P. Konstantinov of National Research Center, Kurchatov Institute, 1 mkr. Orlova Roshcha, Gatchina 188300, Russia
| | - Vladimir Egorov
- Institute of Experimental Medicine, 12 Ulitsa Akademika Pavlova, St. Petersburg 197376, Russia
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Vanniasinghe AS, Manolios N, Schibeci S, Lakhiani C, Kamali-Sarvestani E, Sharma R, Kumar V, Moghaddam M, Ali M, Bender V. Targeting fibroblast-like synovial cells at sites of inflammation with peptide targeted liposomes results in inhibition of experimental arthritis. Clin Immunol 2014; 151:43-54. [PMID: 24513809 DOI: 10.1016/j.clim.2014.01.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 01/10/2014] [Accepted: 01/10/2014] [Indexed: 02/04/2023]
Abstract
In this study we examined a synovium-specific targeted liposomal drug delivery system for its ability to localize and release its drug cargo to inflamed joints. Targeted liposomes were tested in vitro for binding to synovial fibroblast like (FLS) and endothelial cells using flow cytometry and in vivo for localization to joints using a rat model of adjuvant induced arthritis (AIA). Targeted liposomes were then loaded with anti-arthritic medications and examined for clinical efficacy in AIA. Targeted liposomes specifically bound to rabbit FLS and human FLS and showed a 7-10 fold increase in vivo localization in affected joints compared to unaffected joints. Histological sections from rats treated with prednisone and a new immunosuppressive peptide CP showed minimal inflammation. This report substantiates the ability of the novel FLS sequence to target liposomal drug delivery and offers an alternative therapeutic approach for the treatment of arthritis.
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Affiliation(s)
- A S Vanniasinghe
- Department of Rheumatology, Westmead Hospital, Sydney, Australia.
| | - N Manolios
- Department of Rheumatology, Westmead Hospital, Sydney, Australia
| | - S Schibeci
- Institute of Clinical Pathology and Medical Research, Westmead Hospital, Sydney, Australia
| | - C Lakhiani
- Department of Rheumatology, Westmead Hospital, Sydney, Australia
| | | | - R Sharma
- Institute of Clinical Pathology and Medical Research, Westmead Hospital, Sydney, Australia
| | - V Kumar
- Department of Nuclear Medicine & PET Westmead Hospital, Sydney, Australia
| | - M Moghaddam
- CSIRO Molecular & Health Technologies, Sydney, Australia
| | - M Ali
- Department of Rheumatology, Westmead Hospital, Sydney, Australia
| | - V Bender
- Department of Rheumatology, Westmead Hospital, Sydney, Australia
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Matalon E, Faingold O, Eisenstein M, Shai Y, Goldfarb D. The topology, in model membranes, of the core peptide derived from the T-cell receptor transmembrane domain. Chembiochem 2013; 14:1867-75. [PMID: 23881822 DOI: 10.1002/cbic.201300191] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Indexed: 01/16/2023]
Abstract
The T-cell receptor-CD3 complex (TCR-CD3) serves a critical role in protecting organisms from infectious agents. The TCR is a heterodimer composed of α- and β-chains, which are responsible for antigen recognition. Within the transmembrane domain of the α-subunit, a region has been identified to be crucial for the assembly and function of the TCR. This region, termed core peptide (CP), consists of nine amino acids (GLRILLLKV), two of which are charged (lysine and arginine) and are crucial for the interaction with CD3. Earlier studies have shown that a synthetic peptide corresponding to the CP sequence can suppress the immune response in animal models of T-cell-mediated inflammation, by disrupting proper assembly of the TCR. As a step towards the understanding of the source of the CP activity, we focused on CP in egg phosphatidylcholine/cholesterol (9:1, mol/mol) model membranes and determined its secondary structure, oligomerization state, and orientation with respect to the membrane. To achieve this goal, 15-residue segments of TCRα, containing the CP, were synthesized and spin-labeled at different locations with a nitroxide derivative. Electron spin-echo envelope modulation spectroscopy was used to probe the position and orientation of the peptides within the membrane, and double electron-electron resonance measurements were used to probe its conformation and oligomerization state. We found that the peptide is predominantly helical in a membrane environment and tends to form oligomers (mostly dimers) that are parallel to the membrane plane.
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Affiliation(s)
- Erez Matalon
- Department of Chemical Physics, Weizmann Institute of Science, 234 Hertzl St, Rehovot, 7632700 (Israel)
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Manolios N, Ali M, Bender V. T-cell antigen receptor (TCR) transmembrane peptides: A new paradigm for the treatment of autoimmune diseases. Cell Adh Migr 2010; 4:273-83. [PMID: 20431344 DOI: 10.4161/cam.4.2.11909] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Cell surface membranes are generally considered as inert and hydrophobic providing a stable physical barrier that anchor proteins and maintain cellular homeostasis between the intra- and the extra-cellular environment. The integral proteins that transverse membranes do so once or multiple times and can function alone or as part of a larger complex. Far from being inert, there is a multiplicity of biophysical factors that drive protein-protein and protein-lipid interactions within membranes that are being increasingly recognised as very important for cellular function. Unravelling these "hot-spots" on the contact surface of transmembrane (TM) proteins and targeting peptides to these sites to interrupt the cohesive interaction between the proteins provides both an enormous challenge and a huge therapeutic potential that as yet remains unrecognized. Indeed, with biopharmaceutical research on the rise, TM peptides may prove a useful innovation. Using the T-cell antigen receptor (TCR) as a model system of multi-subunits interacting at the TM via electrostatic charges the potential for peptides as therapeutic agents to interfere with normal immune responses is discussed. The principles of such can be extended to other similar receptor systems including those involved in cancer or infection.
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Affiliation(s)
- Nicholas Manolios
- Department of Rheumatology, Westmead Hospital, Westmead, NSW, Australia.
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