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Weimershaus M, Mauvais FX, Saveanu L, Adiko C, Babdor J, Abramova A, Montealegre S, Lawand M, Evnouchidou I, Huber KJ, Chadt A, Zwick M, Vargas P, Dussiot M, Lennon-Dumenil AM, Brocker T, Al-Hasani H, van Endert P. Innate Immune Signals Induce Anterograde Endosome Transport Promoting MHC Class I Cross-Presentation. Cell Rep 2018; 24:3568-3581. [DOI: 10.1016/j.celrep.2018.08.041] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 06/14/2018] [Accepted: 08/15/2018] [Indexed: 12/22/2022] Open
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Lawand M, Evnouchidou I, Baranek T, Montealegre S, Tao S, Drexler I, Saveanu L, Si-Tahar M, van Endert P. Impact of the TAP-like transporter in antigen presentation and phagosome maturation. Mol Immunol 2018; 113:75-86. [PMID: 29941219 DOI: 10.1016/j.molimm.2018.06.268] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 04/23/2018] [Accepted: 06/14/2018] [Indexed: 02/06/2023]
Abstract
Cross-presentation is thought to require transport of proteasome-generated peptides by the TAP transporters into MHC class I loading compartments for most antigens. However, a proteasome-dependent but TAP-independent pathway has also been described. Depletion of the pool of recycling cell surface MHC class I molecules available for loading with cross-presented peptides might partly or largely account for the critical role of TAP in cross-presentation of phagocytosed antigens. Here we examined a potential role of the homodimeric lysosomal TAP-like transporter in cross-presentation and in presentation of endogenous peptides by MHC class II molecules. We find that TAP-L is strongly recruited to dendritic cell phagosomes at a late stage, when internalized antigen and MHC class I molecules have been degraded or sorted away from phagosomes. Cross-presentation of a receptor-targeted antigen in vitro and of a phagocytosed antigen in vivo, as well as presentation of a cytosolic antigen by MHC class II molecules, is not affected by TAP-L deficiency. However, accumulation in vitro of a peptide optimally adapted to TAP-L selectivity in purified phagosomes is abolished by TAP-L deficiency. Unexpectedly, we find that TAP-L deficiency accelerates phagosome maturation, as reflected in increased Lamp2b recruitment and enhanced proteolytic degradation of phagocytosed antigen and in vitro transported peptides. Although additional experimentation will be required to definitely conclude on the role of TAP-L in transport of peptides presented by MHC class I and class II molecules, our data suggest that the principal role of TAP-L in dendritic cells may be related to regulation of phagosome maturation.
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Affiliation(s)
- Myriam Lawand
- Institut National de la Sante et de la Recherche Médicale, Unité 1151; Université Paris Descartes, Faculté de médecine; Centre National de la Recherche Scientifique, UMR8253; 149 rue de Sèvres, 75743 Paris Cedex 15, France
| | - Irini Evnouchidou
- Institut National de la Sante et de la Recherche Médicale, Unité 1151; Université Paris Descartes, Faculté de médecine; Centre National de la Recherche Scientifique, UMR8253; 149 rue de Sèvres, 75743 Paris Cedex 15, France
| | - Thomas Baranek
- Institut National de la Santé et de la Recherche Médicale, Unité 1100, Université F. Rabelais, Faculté de médecine, Centre d'études des pathologies respiratoires, 10 Boulevard Tonnellé, 37032 Tours Cedex, France
| | - Sebastian Montealegre
- Institut National de la Sante et de la Recherche Médicale, Unité 1151; Université Paris Descartes, Faculté de médecine; Centre National de la Recherche Scientifique, UMR8253; 149 rue de Sèvres, 75743 Paris Cedex 15, France
| | - Sha Tao
- Institut für Virologie, Universitätsklinikum Düsseldorf, Heinrich-Heine Universität, 40225 Düsseldorf, Germany
| | - Ingo Drexler
- Institut für Virologie, Universitätsklinikum Düsseldorf, Heinrich-Heine Universität, 40225 Düsseldorf, Germany
| | - Loredana Saveanu
- Institut National de la Sante et de la Recherche Médicale, Unité 1151; Université Paris Descartes, Faculté de médecine; Centre National de la Recherche Scientifique, UMR8253; 149 rue de Sèvres, 75743 Paris Cedex 15, France
| | - Mustapha Si-Tahar
- Institut National de la Santé et de la Recherche Médicale, Unité 1100, Université F. Rabelais, Faculté de médecine, Centre d'études des pathologies respiratoires, 10 Boulevard Tonnellé, 37032 Tours Cedex, France
| | - Peter van Endert
- Institut National de la Sante et de la Recherche Médicale, Unité 1151; Université Paris Descartes, Faculté de médecine; Centre National de la Recherche Scientifique, UMR8253; 149 rue de Sèvres, 75743 Paris Cedex 15, France.
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Papakyriakou A, Zervoudi E, Tsoukalidou S, Mauvais FX, Sfyroera G, Mastellos DC, van Endert P, Theodorakis EA, Vourloumis D, Stratikos E. 3,4-diaminobenzoic acid derivatives as inhibitors of the oxytocinase subfamily of M1 aminopeptidases with immune-regulating properties. J Med Chem 2015; 58:1524-43. [PMID: 25635706 DOI: 10.1021/jm501867s] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Members of the oxytocinase subfamily of M1 aminopeptidases (ERAP1, ERAP2, and IRAP) play important roles in both the adaptive and innate human immune responses. Their enzymatic activity can contribute to the pathogenesis of several major human diseases ranging from viral and parasitic infections to autoimmunity and cancer. We have previously demonstrated that diaminobenzoic acid derivatives show promise as selective inhibitors for this group of aminopeptidases. In this study, we have thoroughly explored a series of 3,4-diaminobenzoic acid derivatives as inhibitors of this class of enzymes, achieving submicromolar inhibitors for ERAP2 (IC50 = 237 nM) and IRAP (IC50 = 105 nM). Cell-based analysis indicated that the lead compounds can be effective in downregulating macrophage activation induced by lipopolysaccharide and interferon-γ as well as cross-presentation by bone marrow-derived dendritic cells. Our results indicate that this class of inhibitors may be useful for the targeted downregulation of immune responses.
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Affiliation(s)
- Athanasios Papakyriakou
- National Center for Scientific Research "Demokritos" , Aghia Paraskevi, 15310 Athens, Greece
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