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Youness A, Cenac C, Faz-López B, Grunenwald S, Barrat FJ, Chaumeil J, Mejía JE, Guéry JC. TLR8 escapes X chromosome inactivation in human monocytes and CD4 + T cells. Biol Sex Differ 2023; 14:60. [PMID: 37723501 PMCID: PMC10506212 DOI: 10.1186/s13293-023-00544-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 09/04/2023] [Indexed: 09/20/2023] Open
Abstract
BACKGROUND Human endosomal Toll-like receptors TLR7 and TLR8 recognize self and non-self RNA ligands, and are important mediators of innate immunity and autoimmune pathogenesis. TLR7 and TLR8 are, respectively, encoded by adjacent X-linked genes. We previously established that TLR7 evades X chromosome inactivation (XCI) in female immune cells. Whether TLR8 also evades XCI, however, has not yet been explored. METHOD In the current study, we used RNA fluorescence in situ hybridization (RNA FISH) to directly visualize, on a single-cell basis, primary transcripts of TLR7 and TLR8 relative to X chromosome territories in CD14+ monocytes and CD4+ T lymphocytes from women, Klinefelter syndrome (KS) men, and euploid men. To assign X chromosome territories in cells lacking robust expression of a XIST compartment, we designed probes specific for X-linked genes that do not escape XCI and therefore robustly label the active X chromosome. We also assessed whether XCI escape of TLR8 was associated with sexual dimorphism in TLR8 protein expression by western blot and flow cytometry. RESULTS Using RNA FISH, we show that TLR8, like TLR7, evades XCI in immune cells, and that cells harboring simultaneously TLR7 and TLR8 transcript foci are more frequent in women and KS men than in euploid men, resulting in a sevenfold difference in frequency. This transcriptional bias was again observable when comparing the single X of XY males with the active X of cells from females or KS males. Interestingly, TLR8 protein expression was significantly higher in female mononuclear blood cells, including all monocyte subsets, than in male cells. CONCLUSIONS TLR8, mirroring TLR7, escapes XCI in human monocytes and CD4+ T cells. Co-dependent transcription from the active X chromosome and escape from XCI could both contribute to higher TLR8 protein abundance in female cells, which may have implications for the response to viruses and bacteria, and the risk of developing inflammatory and autoimmune diseases.
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Affiliation(s)
- Ali Youness
- Institut Toulousain des Maladies Infectieuses et Inflammatoires (INFINITY), UMR 1291 INSERM, CNRS, Hôpital Purpan, Université de Toulouse, 31024 Toulouse, France
| | - Claire Cenac
- Institut Toulousain des Maladies Infectieuses et Inflammatoires (INFINITY), UMR 1291 INSERM, CNRS, Hôpital Purpan, Université de Toulouse, 31024 Toulouse, France
| | - Berenice Faz-López
- Institut Toulousain des Maladies Infectieuses et Inflammatoires (INFINITY), UMR 1291 INSERM, CNRS, Hôpital Purpan, Université de Toulouse, 31024 Toulouse, France
| | - Solange Grunenwald
- Service d’Endocrinologie, Maladies Métaboliques et Nutrition, Hôpital Larrey, Centre Hospitalier Universitaire (CHU) de Toulouse, 31059 Toulouse, France
| | - Franck J. Barrat
- Hospital for Special Surgery, HSS Research Institute and David Z. Rosensweig Genomics Research Center, New York, NY 10021 USA
- Department of Microbiology and Immunology, Weill Cornell Medical College of Cornell University, New York, NY 10021 USA
| | - Julie Chaumeil
- INSERM, CNRS, Université Paris Cité, Institut Cochin, 75014 Paris, France
| | - José Enrique Mejía
- Institut Toulousain des Maladies Infectieuses et Inflammatoires (INFINITY), UMR 1291 INSERM, CNRS, Hôpital Purpan, Université de Toulouse, 31024 Toulouse, France
| | - Jean-Charles Guéry
- Institut Toulousain des Maladies Infectieuses et Inflammatoires (INFINITY), UMR 1291 INSERM, CNRS, Hôpital Purpan, Université de Toulouse, 31024 Toulouse, France
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Speca S, Farhat MM, Jendoubi M, Guerrier T, Sanges S, Staumont-Sallé D, Hachulla E, Dubucquoi S, Sobanski V, Collet A, Launay D. Intravenous immunoglobulins improve skin fibrosis in experimental models of systemic sclerosis. Sci Rep 2023; 13:15102. [PMID: 37700078 PMCID: PMC10497569 DOI: 10.1038/s41598-023-42464-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 09/11/2023] [Indexed: 09/14/2023] Open
Abstract
Systemic sclerosis (SSc) is the most severe systemic autoimmune disease with currently no cure. Intravenous immunoglobulins (IVIg) are an attractive candidate in this disease to counteract inflammation and fibrosis but data are scarce and conflicting. This study, assessed the effects of IVIg in a murine HOCl-induced model of SSc. We showed that IVIg prevented skin inflammation and fibrosis, by mitigating the immune cell infiltration (p = 0.04), proinflammatory cytokines gene overexpression (IL1β, p = 0.04; TNFα, p = 0.04; IL6, p = 0.05), skin and dermal thickening (p = 0.003 at d21 and p = 0.0003 at d42), the expression markers of fibrosis, such as αSMA (p = 0.031 for mRNA and p = 0.05 for protein), collagen (p = 0.05 for mRNA and p = 0.04 for protein, p = 0.05 for the hydroxyproline content) and fibronectin (p = 0.033 for mRNA). Moreover, IVIg prevented HOCl-induced alterations in splenic cell homeostasis. When administered in curative mode, despite their ability to reduce skin and dermal thickness (p < 0.0001 and p = 0.0002), IVIg showed partial or more mixed effects on skin inflammation and established fibrosis. These data favor further clinical trials in SSc patients on the potential efficiency of early and/or repeated IVIg administration.
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Affiliation(s)
- Silvia Speca
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
| | - Meryem-Maud Farhat
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Département de Médecine Interne Et Immunologie Clinique, Centre de Référence Des Maladies Auto-Immunes Systémiques Rares du Nord Et Nord-Ouest de France (CeRAINO), CHU Lille, Lille, France
| | - Manel Jendoubi
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
| | - Thomas Guerrier
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
| | - Sébastien Sanges
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Département de Médecine Interne Et Immunologie Clinique, Centre de Référence Des Maladies Auto-Immunes Systémiques Rares du Nord Et Nord-Ouest de France (CeRAINO), CHU Lille, Lille, France
| | - Delphine Staumont-Sallé
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Service de Dermatologie, CHU Lille, Lille, France
| | - Eric Hachulla
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Département de Médecine Interne Et Immunologie Clinique, Centre de Référence Des Maladies Auto-Immunes Systémiques Rares du Nord Et Nord-Ouest de France (CeRAINO), CHU Lille, Lille, France
| | - Sylvain Dubucquoi
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Institut d'Immunologie, Centre de Biologie Pathologie, CHU Lille, Lille, France
| | - Vincent Sobanski
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Département de Médecine Interne Et Immunologie Clinique, Centre de Référence Des Maladies Auto-Immunes Systémiques Rares du Nord Et Nord-Ouest de France (CeRAINO), CHU Lille, Lille, France
| | - Aurore Collet
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France
- Institut d'Immunologie, Centre de Biologie Pathologie, CHU Lille, Lille, France
| | - David Launay
- University of Lille, Inserm, CHU Lille, U1286-INFINITE-Institute for Translational Research in Inflammation, Lille, France.
- Département de Médecine Interne Et Immunologie Clinique, Centre de Référence Des Maladies Auto-Immunes Systémiques Rares du Nord Et Nord-Ouest de France (CeRAINO), CHU Lille, Lille, France.
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