Article (Scientific journals)
The Extended N-Terminal Domain Confers Atypical Chemokine Receptor Properties to CXCR3-B.
D'Uonnolo, Giulia; Reynders, Nathan; Meyrath, Max et al.
2022In Frontiers in Immunology, 13, p. 868579
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Keywords :
ACKR2; ACKR3; CXCL10/IP-10; CXCL11/I-TAC; CXCR3B; arrestin; isoform; scavenger; Chemokine CXCL11; Chemokines; beta-Arrestins; Alternative Splicing; Chemokine CXCL11/metabolism; beta-Arrestins/metabolism; beta-Arrestins/pharmacology; Chemokines/metabolism; Signal Transduction; Immunology; Immunology and Allergy
Abstract :
[en] The chemokine receptor CXCR3 plays a critical role in immune cell recruitment and activation. CXCR3 exists as two main isoforms, CXCR3-A and CXCR3-B, resulting from alternative splicing. Although the two isoforms differ only by the presence of an N-terminal extension in CXCR3-B, they have been attributed divergent functional effects on cell migration and proliferation. CXCR3-B is the more enigmatic isoform and the mechanisms underlying its function and signaling remain elusive. We therefore undertook an in-depth cellular and molecular comparative study of CXCR3-A and CXCR3-B, investigating their activation at different levels of the signaling cascades, including G protein coupling, β-arrestin recruitment and modulation of secondary messengers as well as their downstream gene response elements. We also compared the subcellular localization of the two isoforms and their trafficking under resting and stimulated conditions along with their ability to internalize CXCR3-related chemokines. Here, we show that the N-terminal extension of CXCR3-B drastically affects receptor features, modifying its cellular localization and preventing G protein coupling, while preserving β-arrestin recruitment and chemokine uptake capacities. Moreover, we demonstrate that gradual truncation of the N terminus leads to progressive recovery of surface expression and G protein coupling. Our study clarifies the molecular basis underlying the divergent effects of CXCR3 isoforms, and emphasizes the β-arrestin-bias and the atypical nature of CXCR3-B.
Disciplines :
Biochemistry, biophysics & molecular biology
Pharmacy, pharmacology & toxicology
Author, co-author :
D'Uonnolo, Giulia;  Immuno-Pharmacology and Interactomics, Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg ; Faculty of Science, Technology and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
Reynders, Nathan;  Immuno-Pharmacology and Interactomics, Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg ; Faculty of Science, Technology and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
Meyrath, Max;  Immuno-Pharmacology and Interactomics, Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg
Abboud, Dayana  ;  Université de Liège - ULiège > Département de pharmacie
Uchański, Tomasz;  Immuno-Pharmacology and Interactomics, Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg
Laeremans, Toon;  Confo Therapeutics, Ghent, Belgium
Volkman, Brian F;  Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, United States
Janji, Bassam;  Tumor Immunotherapy and Microenvironment, Department of Oncology, Luxembourg Institute of Health, Luxembourg City, Luxembourg
Hanson, Julien  ;  Université de Liège - ULiège > GIGA > GIGA Molecular Biology of Diseases - Molecular Pharmacology
Szpakowska, Martyna;  Immuno-Pharmacology and Interactomics, Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg ; Tumor Immunotherapy and Microenvironment, Department of Oncology, Luxembourg Institute of Health, Luxembourg City, Luxembourg
Chevigné, Andy ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques ; Immuno-Pharmacology and Interactomics, Department of Infection and Immunity, Luxembourg Institute of Health, Esch-sur-Alzette, Luxembourg
Language :
English
Title :
The Extended N-Terminal Domain Confers Atypical Chemokine Receptor Properties to CXCR3-B.
Publication date :
2022
Journal title :
Frontiers in Immunology
eISSN :
1664-3224
Publisher :
Frontiers Media SA, Switzerland
Volume :
13
Pages :
868579
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FNR - Fonds National de la Recherche [LU]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
EU - European Union [BE]
COST - European Cooperation in Science and Technology [BE]
Funding text :
H2020 Marie Skłodowska-Curie Actions
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since 04 July 2022

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