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Pease JE, Sozzani S. Atypical chemoattractants and their receptors: A potential gateway to novel therapeutic strategies. Cytokine 2024; 178:156580. [PMID: 38538412 DOI: 10.1016/j.cyto.2024.156580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Affiliation(s)
- James Edward Pease
- National Heart & Lung Institute, Imperial College London, South Kensington, London, UK.
| | - Silvano Sozzani
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Institute Pasteur-Italia, Rome, Italy.
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Lowry E, Chellappa RC, Penaranda B, Sawant KV, Wakamiya M, Garofalo RP, Rajarathnam K. CXCL17 is a proinflammatory chemokine and promotes neutrophil trafficking. J Leukoc Biol 2024; 115:1177-1182. [PMID: 38298146 PMCID: PMC11135614 DOI: 10.1093/jleuko/qiae028] [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: 11/25/2023] [Revised: 01/17/2024] [Accepted: 01/19/2024] [Indexed: 02/02/2024] Open
Abstract
CXCL17, a novel member of the CXC chemokine class, has been implicated in several human pathologies, but its role in mediating immune response is not well understood. Characteristic features of immune response include resident macrophages orchestrating successive and structured recruitment of neutrophils and monocytes to the insult site. Here, we show that Cxcl17 knockout (KO) mice, compared with the littermate wild-type control mice, were significantly impaired in peritoneal neutrophil recruitment post-lipopolysaccharide (LPS) challenge. Further, the KO mice show dysregulated Cxcl1, Cxcr2, and interleukin-6 levels, all of which directly impact neutrophil recruitment. Importantly, the KO mice showed no difference in monocyte recruitment post-LPS challenge or in peritoneal macrophage levels in both unchallenged and LPS-challenged mice. We conclude that Cxcl17 is a proinflammatory chemokine and that it plays an important role in the early proinflammatory response by promoting neutrophil recruitment to the insult site.
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Affiliation(s)
- Emily Lowry
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
| | - Rani C Chellappa
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
| | - Brigith Penaranda
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
| | - Kirti V Sawant
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
| | - Maki Wakamiya
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
| | - Roberto P Garofalo
- Department of Microbiology and Immunology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
- Department of Pediatrics, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
- Institute for Human Infections and Immunity, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
| | - Krishna Rajarathnam
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
- Department of Microbiology and Immunology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
- Institute for Human Infections and Immunity, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555, United States
- Sealy Center for Structural Biology and Molecular Biophysics, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX, United States
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Li D, Wan X, Yun Y, Li Y, Duan W. Genes Selectively Expressed in Rat Organs. Curr Genomics 2024; 25:261-297. [PMID: 39156728 PMCID: PMC11327808 DOI: 10.2174/0113892029273121240401060228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 11/24/2023] [Accepted: 12/05/2023] [Indexed: 08/20/2024] Open
Abstract
Background Understanding organic functions at a molecular level is important for scientists to unveil the disease mechanism and to develop diagnostic or therapeutic methods. Aims The present study tried to find genes selectively expressed in 11 rat organs, including the adrenal gland, brain, colon, duodenum, heart, ileum, kidney, liver, lung, spleen, and stomach. Materials and Methods Three normal male Sprague-Dawley (SD) rats were anesthetized, their organs mentioned above were harvested, and RNA in the fresh organs was extracted. Purified RNA was reversely transcribed and sequenced using the Solexa high-throughput sequencing technique. The abundance of a gene was measured by the expected value of fragments per kilobase of transcript sequence per million base pairs sequenced (FPKM). Genes in organs with the highest expression level were sought out and compared with their median value in organs. If a gene in the highest expressed organ was significantly different (p < 0.05) from that in the medianly expressed organ, accompanied by q value < 0.05, and accounted for more than 70% of the total abundance, the gene was assumed as the selective gene in the organ. Results & Discussion The Kyoto Encyclopedia of Genes and Genomes (KEGG), and Gene Ontology (GO) pathways were enriched by the highest expressed genes. Based on the criterion, 1,406 selective genes were screened out, 1,283 of which were described in the gene bank and 123 of which were waiting to be described. KEGG and GO pathways in the organs were partly confirmed by the known understandings and a good portion of the pathways needed further investigation. Conclusion The novel selective genes and organic functional pathways are useful for scientists to unveil the mechanisms of the organs at the molecular level, and the selective genes' products are candidate disease markers for organs.
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Affiliation(s)
- Dan Li
- The Department of Pharmacology, School of Basic Medicine, Kunming Medical University, Kunming, 650500, China
| | - Xulian Wan
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, 650500, China
| | - Yu Yun
- The Department of Pharmacology, School of Basic Medicine, Kunming Medical University, Kunming, 650500, China
| | - Yongkun Li
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, 650500, China
| | - Weigang Duan
- School of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, 650500, China
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Aleotti A, Goulty M, Lewis C, Giorgini F, Feuda R. The origin, evolution, and molecular diversity of the chemokine system. Life Sci Alliance 2024; 7:e202302471. [PMID: 38228369 DOI: 10.26508/lsa.202302471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/15/2023] [Accepted: 12/18/2023] [Indexed: 01/18/2024] Open
Abstract
Chemokine signalling performs key functions in cell migration via chemoattraction, such as attracting leukocytes to the site of infection during host defence. The system consists of a ligand, the chemokine, usually secreted outside the cell, and a chemokine receptor on the surface of a target cell that recognises the ligand. Several noncanonical components interact with the system. These include a variety of molecules that usually share some degree of sequence similarity with canonical components and, in some cases, are known to bind to canonical components and/or to modulate cell migration. Whereas canonical components have been described in vertebrate lineages, the distribution of the noncanonical components is less clear. Uncertainty over the relationships between canonical and noncanonical components hampers our understanding of the evolution of the system. We used phylogenetic methods, including gene-tree to species-tree reconciliation, to untangle the relationships between canonical and noncanonical components, identify gene duplication events, and clarify the origin of the system. We found that unrelated ligand groups independently evolved chemokine-like functions. We found noncanonical ligands outside vertebrates, such as TAFA "chemokines" found in urochordates. In contrast, all receptor groups are vertebrate-specific and all-except ACKR1-originated from a common ancestor in early vertebrates. Both ligand and receptor copy numbers expanded through gene duplication events at the base of jawed vertebrates, with subsequent waves of innovation occurring in bony fish and mammals.
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Affiliation(s)
- Alessandra Aleotti
- https://ror.org/04h699437 Neurogenetics Group, University of Leicester, Leicester, UK
- https://ror.org/04h699437 Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Matthew Goulty
- https://ror.org/04h699437 Neurogenetics Group, University of Leicester, Leicester, UK
- https://ror.org/04h699437 Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Clifton Lewis
- https://ror.org/04h699437 Neurogenetics Group, University of Leicester, Leicester, UK
- https://ror.org/04h699437 Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Flaviano Giorgini
- https://ror.org/04h699437 Neurogenetics Group, University of Leicester, Leicester, UK
- https://ror.org/04h699437 Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Roberto Feuda
- https://ror.org/04h699437 Neurogenetics Group, University of Leicester, Leicester, UK
- https://ror.org/04h699437 Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
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Giblin SP, Ranawana S, Hassibi S, Birchenough HL, Mincham KT, Snelgrove RJ, Tsuchiya T, Kanegasaki S, Dyer D, Pease JE. CXCL17 binds efficaciously to glycosaminoglycans with the potential to modulate chemokine signaling. Front Immunol 2023; 14:1254697. [PMID: 37942327 PMCID: PMC10628517 DOI: 10.3389/fimmu.2023.1254697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/09/2023] [Indexed: 11/10/2023] Open
Abstract
Introduction CXCL17 is a mucosally secreted protein, and the most recently identified human chemokine, an assignment based on protein fold prediction and chemotactic activity for leukocytes. However, these credentials have been the subject of much recent discussion and no experimental evidence has been presented regarding the definitive structure of CXCL17. In this study, we evaluated the structural and chemoattractant credentials of CXCL17 to better characterize this molecule, and gain deeper insights into its functional role as a glycosaminoglycan (GAG) binding protein. Methods In the absence of structural information, in silico modeling techniques assessed the likelihood of CXCL17 adopting a chemokine fold. Recombinant CXCL17 was synthesized in mammalian and prokaryotic systems. Modified Boyden chamber and real-time chemotaxis assays assessed the ability of CXCL17 to promote chemotaxis of murine splenocytes, human neutrophils, and CXCR1 transfectants. The efficacy of CXCL17 binding to GAGs was quantified with solid-phase assays and bio-layer interferometry techniques. Results All modeling efforts failed to support classification of CXCL17 as a chemokine based on its predicted conformation. Recombinant CXCL17 was observed to dimerize as a function of concentration, a characteristic of several chemokines. Contrary to a previous report, CXCL17 was not chemotactic for murine splenocytes, although it was a low-potency chemoattractant for human neutrophils at micromolar concentrations, several orders of magnitude higher than those required for CXCL8. As anticipated owing to its highly basic nature, CXCL17 bound to GAGs robustly, with key C-terminal motifs implicated in this process. While inactive via CXCR1, CXCL17 was found to inhibit CXCR1-mediated chemotaxis of transfectants to CXCL8 in a dose-dependent manner. Discussion In summary, despite finding little evidence for chemokine-like structure and function, CXCL17 readily bound GAGs, and could modulate chemotactic responses to another chemokine in vitro. We postulate that such modulation is a consequence of superior GAG binding, and that C-terminal fragments of CXCL17 may serve as prototypic inhibitors of chemokine function.
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Affiliation(s)
- Sean P. Giblin
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Sashini Ranawana
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Shyreen Hassibi
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Holly L. Birchenough
- Wellcome Centre for Cell-Matrix Research, Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
| | - Kyle T. Mincham
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Robert J. Snelgrove
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Tomoko Tsuchiya
- Research Institute, National Center for Global Health and Medicine, Shinjuku-ku, Japan
| | | | - Douglas Dyer
- Wellcome Centre for Cell-Matrix Research, Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
- Geoffrey Jefferson Brain Research Centre, Manchester Academic Health Science Centre, Northern Care Alliance NHS Group, University of Manchester, Manchester, United Kingdom
| | - James E. Pease
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
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