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Diagbouga MR, Lemeille S, Morel S, Kwak BR. Impact of disrupted cyclic stretch in intracranial aneurysms: Insights from endothelial cell transcriptomic dataset. Data Brief 2024; 52:110014. [PMID: 38235173 PMCID: PMC10792734 DOI: 10.1016/j.dib.2023.110014] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 01/19/2024] Open
Abstract
Intracranial aneurysm (IA) rupture is a common cause of hemorrhagic stroke. The treatment of unruptured IAs is a challenging decision that requires delicate risk stratification. The rate of poor clinical outcomes after surgical intervention (aneurysm clipping) or endovascular coiling remains elevated (6.7% and 4.8%, respectively), and they do not provide an absolute guarantee to prevent IA growth and rupture. Currently, there is no pharmaceutical treatment to cure or stabilize IAs. Improving the current or developing new treatments for IA disease would require a better understanding of the cellular and molecular mechanisms occurring in the different stages of the disease. Hemodynamic forces play a critical role in IA disease. While the role of wall shear stress in IAs is well-established, the influence of cyclic circumferential stretch (CCS) still needs clarification. IAs are generally characterized by a lack of CCS. In this investigation, we sought to understand the effect of aneurysmal CCS on endothelial cell (EC) function and its potential significance in IA disease, hypothesizing that CCS can influence IA wall remodelling. RNA-seq data were generated from human umbilical vein ECs (HUVECs) exposed to physiological (6%) or aneurysmal CCS (static). We performed differential gene expression and pathway enrichment analysis. Additionally, we highlighted cell junction gene expression between static and 6% CCS to contribute to the debate about how cell junctions affect endothelium stability and integrity. Researchers in the vascular biology field may benefit from this transcriptomic profile to understand the effect of mechanical stretch on EC biology and its potential significance in vascular disease development.
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Affiliation(s)
- Mannekomba R. Diagbouga
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
- Geneva Center for Inflammation Research, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
| | - Sandrine Morel
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
- Geneva Center for Inflammation Research, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
- Division of Neurosurgery, Department of Clinical Neurosciences, Faculty of Medicine, Geneva University Hospitals and University of Geneva. Rue Gabrielle-Perret-Gentil 4, 1211 Geneva, Switzerland
| | - Brenda R. Kwak
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
- Geneva Center for Inflammation Research, Faculty of Medicine, University of Geneva. Rue Michel-Servet 1, 1211 Geneva, Switzerland
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2
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Martinez-Murillo PA, Huttner A, Lemeille S, Medaglini D, Ottenhoff THM, Harandi AM, Didierlaurent AM, Siegrist CA. Refined innate plasma signature after rVSVΔG-ZEBOV-GP immunization is shared among adult cohorts in Europe and North America. Front Immunol 2024; 14:1279003. [PMID: 38235127 PMCID: PMC10791923 DOI: 10.3389/fimmu.2023.1279003] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 12/07/2023] [Indexed: 01/19/2024] Open
Abstract
Background During the last decade Ebola virus has caused several outbreaks in Africa. The recombinant vesicular stomatitis virus-vectored Zaire Ebola (rVSVΔG-ZEBOV-GP) vaccine has proved safe and immunogenic but is reactogenic. We previously identified the first innate plasma signature response after vaccination in Geneva as composed of five monocyte-related biomarkers peaking at day 1 post-immunization that correlates with adverse events, biological outcomes (haematological changes and viremia) and antibody titers. In this follow-up study, we sought to identify additional biomarkers in the same Geneva cohort and validate those identified markers in a US cohort. Methods Additional biomarkers were identified using multiplexed protein biomarker platform O-link and confirmed by Luminex. Principal component analysis (PCA) evaluated if these markers could explain a higher variability of the vaccine response (and thereby refined the initial signature). Multivariable and linear regression models evaluated the correlations of the main components with adverse events, biological outcomes, and antibody titers. External validation of the refined signature was conducted in a second cohort of US vaccinees (n=142). Results Eleven additional biomarkers peaked at day 1 post-immunization: MCP2, MCP3, MCP4, CXCL10, OSM, CX3CL1, MCSF, CXCL11, TRAIL, RANKL and IL15. PCA analysis retained three principal components (PC) that accounted for 79% of the vaccine response variability. PC1 and PC2 were very robust and had different biomarkers that contributed to their variability. PC1 better discriminated different doses, better defined the risk of fever and myalgia, while PC2 better defined the risk of headache. We also found new biomarkers that correlated with reactogenicity, including transient arthritis (MCP-2, CXCL10, CXCL11, CX3CL1, MCSF, IL-15, OSM). Several innate biomarkers are associated with antibody levels one and six months after vaccination. Refined PC1 correlated strongly in both data sets (Geneva: r = 0.97, P < 0.001; US: r = 0.99, P< 0.001). Conclusion Eleven additional biomarkers refined the previously found 5-biomarker Geneva signature. The refined signature better discriminated between different doses, was strongly associated with the risk of adverse events and with antibody responses and was validated in a separate cohort.
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Affiliation(s)
- Paola Andrea Martinez-Murillo
- Center of Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Angela Huttner
- Center for Vaccinology, Geneva University Hospitals, Geneva, Switzerland
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Center for Clinical Research, Geneva University Hospitals, Geneva, Switzerland
| | - Sylvain Lemeille
- Center of Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Donata Medaglini
- Laboratory of Molecular Microbiology and Biotechnology, Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Tom H. M. Ottenhoff
- Department of Infectious Diseases, Leiden University Medical Center, Leiden, Netherlands
| | - Ali M. Harandi
- Department of Microbiology and Immunology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Vaccine Evaluation Centre, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - Arnaud M. Didierlaurent
- Center of Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Claire-Anne Siegrist
- Center of Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Center for Vaccinology, Geneva University Hospitals, Geneva, Switzerland
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3
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Roussel-Gervais A, Sgroi S, Cambet Y, Lemeille S, Seredenina T, Krause KH, Jaquet V. Genetic knockout of NTRK2 by CRISPR/Cas9 decreases neurogenesis and favors glial progenitors during differentiation of neural progenitor stem cells. Front Cell Neurosci 2023; 17:1289966. [PMID: 38161998 PMCID: PMC10757602 DOI: 10.3389/fncel.2023.1289966] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/22/2023] [Indexed: 01/03/2024] Open
Abstract
The tropomyosin receptor kinase B (TrkB) is encoded by the NTRK2 gene. It belongs to the family of transmembrane tyrosine kinases, which have key roles in the development and maintenance of the nervous system. Brain-derived neurotrophic factor (BDNF) and the neurotrophins NT3 and NT4/5 have high affinity for TrkB. Dysregulation of TrkB is associated to a large spectrum of diseases including neurodegeneration, psychiatric diseases and some cancers. The function of TrkB and its role in neural development have mainly been decrypted using transgenic mouse models, pharmacological modulators and human neuronal cell lines overexpressing NTRK2. In this study, we identified high expression and robust activity of TrkB in ReNcell VM, an immortalized human neural progenitor stem cell line and generated NTRK2-deficient (NTRK2-/-) ReNcell VM using the CRISPR/Cas9 gene editing technology. Global transcriptomic analysis revealed major changes in expression of specific genes responsible for neurogenesis, neuronal development and glial differentiation. In particular, key neurogenic transcription factors were massively down-regulated in NTRK2-/- cells, while early glial progenitor markers were enriched in NTRK2-/- cells compared to NTRK2+/+. This indicates a previously undescribed inhibitory role of TrkB on glial differentiation in addition to its well-described pro-neurogenesis role. Altogether, we have generated for the first time a human neural cell line with a loss-of-function mutation of NTRK2, which represents a reproducible and readily available cell culture system to study the role of TrkB during human neural differentiation, analyze the role of TrkB isoforms as well as validate TrkB antibodies and pharmacological agents targeting the TrkB pathway.
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Affiliation(s)
- Audrey Roussel-Gervais
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Stéphanie Sgroi
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Yves Cambet
- READS Unit, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Tamara Seredenina
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Karl-Heinz Krause
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Vincent Jaquet
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- READS Unit, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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4
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Vono M, Mastelic-Gavillet B, Mohr E, Östensson M, Persson J, Olafsdottir TA, Lemeille S, Pejoski D, Hartley O, Christensen D, Andersen P, Didierlaurent AM, Harandi AM, Lambert PH, Siegrist CA. C-type lectin receptor agonists elicit functional IL21-expressing Tfh cells and induce primary B cell responses in neonates. Front Immunol 2023; 14:1155200. [PMID: 37063899 PMCID: PMC10102809 DOI: 10.3389/fimmu.2023.1155200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 03/16/2023] [Indexed: 04/03/2023] Open
Abstract
IntroductionC-type lectin receptor (CLR) agonists emerged as superior inducers of primary B cell responses in early life compared with Toll-like receptor (TLR) agonists, while both types of adjuvants are potent in adults.MethodsHere, we explored the mechanisms accounting for the differences in neonatal adjuvanticity between a CLR-based (CAF®01) and a TLR4-based (GLA-SE) adjuvant administered with influenza hemagglutinin (HA) in neonatal mice, by using transcriptomics and systems biology analyses.ResultsOn day 7 after immunization, HA/CAF01 increased IL6 and IL21 levels in the draining lymph nodes, while HA/GLA-SE increased IL10. CAF01 induced mixed Th1/Th17 neonatal responses while T cell responses induced by GLA-SE had a more pronounced Th2-profile. Only CAF01 induced T follicular helper (Tfh) cells expressing high levels of IL21 similar to levels induced in adult mice, which is essential for germinal center (GC) formation. Accordingly, only CAF01- induced neonatal Tfh cells activated adoptively transferred hen egg lysozyme (HEL)-specific B cells to form HEL+ GC B cells in neonatal mice upon vaccination with HEL-OVA.DiscussionCollectively, the data show that CLR-based adjuvants are promising neonatal and infant adjuvants due to their ability to harness Tfh responses in early life.
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Affiliation(s)
- Maria Vono
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
- *Correspondence: Maria Vono,
| | - Beatris Mastelic-Gavillet
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Elodie Mohr
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Malin Östensson
- Department of Microbiology and Immunology, University of Gothenburg, Gothenburg, Sweden
| | - Josefine Persson
- Department of Microbiology and Immunology, University of Gothenburg, Gothenburg, Sweden
| | | | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - David Pejoski
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Oliver Hartley
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Dennis Christensen
- Vaccine Adjuvant Research, Department of Infectious Disease Immunology, Statens Serum Institut, Copenhagen, Denmark
| | - Peter Andersen
- Vaccine Adjuvant Research, Department of Infectious Disease Immunology, Statens Serum Institut, Copenhagen, Denmark
| | - Arnaud M. Didierlaurent
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Ali M. Harandi
- Department of Microbiology and Immunology, University of Gothenburg, Gothenburg, Sweden
- Vaccine Evaluation Center, British Columbia (BC) Children’s Hospital Research Institute, University of British Columbia, Vancouver, BC, Canada
| | - Paul-Henri Lambert
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Claire-Anne Siegrist
- Center for Vaccine Immunology, Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
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5
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Cardoso Dos Santos LM, Azar P, Lemeille S, Bochaton-Piallat ML. Role of smooth muscle-derived S100A4 in an atherosclerotic mouse model. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.3050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
S100A4, a small calcium binding protein, plays an important role in vascular smooth muscle cell (SMC) phenotypic switch but its implication in atherosclerotic plaque development and particularly in SMC phenotypic plasticity is not clear yet. By neutralizing S100A4 using a monoclonal antibody, we have previously shown a reduction in overall atherosclerotic burden. However, this strategy did not distinguish the different contribution between SMCs or other S100A4-expressing cells (e.g. macrophages).
Methods
Herein, we used a lineage tracing mouse model in which we induced a SMC specific deletion of S100A4 (SMC-S100A4Δ/Δ) in an ApoE−/− background. High cholesterol diet was maintained for 12 weeks, after which, SMC-S100A4Δ/Δ and control mice (SMC-S100A4wt/wt) were sacrificed and aortas processed for staining and single cell RNA sequencing (scRNA-seq).
Results
We showed that S100A4 deletion modulated plaque composition rather than plaque size. ScRNA-seq analysis from SMC-S100A4Δ/Δ and SMC-S100A4wt/wt showed a reduction in macrophages and dendritic cells and an increase in total SMCs, likely participating in fibrous cap stabilization. SMC populations showed a decrease in macrophage-like inflammatory phenotype and an increase in fibroblast-like repair phenotype, as well as retention of specific SMC markers, namely Acta2 and Myh11. Gene expression analysis revealed a reduction in the expression of inflammation markers, fatty acid metabolism, and extracellular matrix-related genes, and an increase in classical SMC markers and maintenance of the contractile phenotype.
Conclusion
We report an intrinsic function of S100A4 in the establishment of SMC fate within the plaque and, surprisingly, a global impact on the atherosclerotic plaque microenvironnement and inflammation status.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Swiss National Science Foundation
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Affiliation(s)
| | - P Azar
- University of Geneva, Dpt. of Pathology and Immunology , Geneva , Switzerland
| | - S Lemeille
- University of Geneva, Dpt. of Pathology and Immunology , Geneva , Switzerland
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6
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Diagbouga MR, Morel S, Lemeille S, Kwak BR. Aneurysmal cyclic circumferential stretch affects the expression of endothelial genes involved in vascular homeostasis. Cardiovasc Res 2022. [DOI: 10.1093/cvr/cvac066.196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Intracranial aneurysm (IA) rupture is a common cause of hemorrhagic stroke. IAs are present in 3 to 5% of the general population and the annual rupture rate of an IA has been estimated to 1%. Once formed, an IA can rupture immediately, grow before rupturing, or remain stable. Predicting the evolution of an unruptured IA is very difficult. Indeed, the biology of the IA wall is complex and the precise biomechanical processes leading to aneurysm wall rupture are not yet known. While the contribution of wall shear stress in IA disease has been demonstrated in several studies, the role of cyclic circumferential stretch (CCS) remains poorly understood.
Purpose
The levels of CCS in saccular IAs are unknown but are generally considered very low or even absent. The goal of our study was to investigate the transcriptional response of endothelial cells (ECs) to absence of CCS and the potential impact on the endothelium function.
Methods
Human umbilical veins ECs (HUVECs) from 6 different donors were exposed to physiological CCS levels for cerebral arteries (6% stretch) or to aneurysmal CCS (0%) for 48h using the Flexcell strain unit FX-5000T, and unbiased transcriptomics were performed. The expression of selected genes was confirmed by qPCR.
Results
As a validation of our methodology, we verified the induction of eNOS phosphorylation after exposure of the ECs to physiological CCS. Stretched EC samples display a high similarity between each other while EC samples under aneurysmal CCS were spread-out on a multidimensional scaling plot. The differential gene expression of ECs exposed to aneurysmal or physiological CCS revealed 51 up-regulated genes and 49 down-regulated genes in absence of CCS. The gene set enrichment analysis identified 70 up-regulated and 38 down-regulated pathways in HUVECs exposed to aneurysmal CCS. Up-regulated pathways were involved in oxidative stress, angiogenic and inflammatory pathways, and the down-regulated pathways in proliferation and extracellular matrix-receptor interactions. We confirmed by qPCR the down-regulation by aneurysmal CCS of Gja4 and Gja5, genes coding for the gap junction proteins Connexin37 (Cx37) and Connexin40 (Cx40), respectively. Connexins (Cxs) are crucial proteins for endothelial homeostasis, vascular function, endothelial cell cycle regulation and inflammation, and their role in the context of IA disease will be further studied.
Conclusion
Our results indicate that physiological CCS prevents large deviation in ECs and regulate the expression of genes essential for maintaining vascular homeostasis. The down-regulation of endothelial Cx37 and Cx40 under aneurysmal CSS may contribute to the endothelial dysfunction associated with IA progression. Further investigation may help to better define the role of Cxs in aneurysmal disease and to understand the significance of absence of CCS in IA disease progression.
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Affiliation(s)
- MR Diagbouga
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology , Geneva , Switzerland
| | - S Morel
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology , Geneva , Switzerland
| | - S Lemeille
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology , Geneva , Switzerland
| | - BR Kwak
- University of Geneva, Faculty of Medicine, Department of Pathology and Immunology , Geneva , Switzerland
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7
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Cardoso Dos Santos LM, Azar P, Lemeille S, Bochaton-Piallat ML. Smooth muscle cell-specific deletion of S100A4 reroutes smooth muscle cell fate and modifies the inflammatory status of murine atherosclerotic lesions. Cardiovasc Res 2022. [DOI: 10.1093/cvr/cvac066.201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Other. Main funding source(s): Swiss National Science Foundation
Foundation Centre de Recherches Médicales Carlos and Elsie de Reuter
Background aims: S100A4, a small calcium binding protein, plays an important role in vascular smooth muscle cell (SMC) phenotypic switch but its implication in atherosclerotic plaque development and particularly in SMC phenotypic plasticity is not clear yet. By neutralizing S100A4 using a monoclonal antibody, we have previously shown a reduction in overall atherosclerotic burden. However, this strategy did not distinguish the different contribution between SMCs or other S100A4-expressing cells (e.g. macrophages).
Methods
Herein, we used a lineage tracing mouse model in which we induced a SMC specific deletion of S100A4 (SMC-S100A4Δ/Δ) in an ApoE-/- background. High cholesterol diet was maintained for 12 weeks, after which, SMC-S100A4Δ/Δ and control mice (SMC-S100A4wt/wt) were sacrificed and aortas processed for staining and single cell RNA sequencing (scRNA-seq).
Results
We showed that S100A4 deletion modulated plaque composition rather than plaque size. ScRNA-seq analysis from SMC-S100A4Δ/Δ and SMC-S100A4wt/wt showed a reduction in macrophages and dendritic cells and an increase in total SMCs, likely participating in fibrous cap stabilization. SMC populations showed a decrease in macrophage-like inflammatory phenotype and an increase in fibroblast-like repair phenotype, as well as retention of specific SMC markers, namely Acta2 and Myh11. Gene expression analysis revealed a reduction in the expression of inflammation markers, fatty acid metabolism, and extracellular matrix-related genes, and an increase in classical SMC markers and maintenance of the contractile phenotype.
Conclusion
We report an intrinsic function of S100A4 in the establishment of SMC fate within the plaque and, surprisingly, a global impact on the atherosclerotic plaque microenvironnement and inflammation status.
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Affiliation(s)
| | - P Azar
- University of Geneva, Dpt. of Pathology and Immunology , Geneva , Switzerland
| | - S Lemeille
- University of Geneva, Dpt. of Pathology and Immunology , Geneva , Switzerland
| | - ML Bochaton-Piallat
- University of Geneva, Dpt. of Pathology and Immunology , Geneva , Switzerland
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8
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Vincenti I, Page N, Steinbach K, Yermanos A, Lemeille S, Nunez N, Kreutzfeldt M, Klimek B, Di Liberto G, Egervari K, Piccinno M, Shammas G, Mariotte A, Fonta N, Liaudet N, Shlesinger D, Liuzzi AR, Wagner I, Saadi C, Stadelmann C, Reddy S, Becher B, Merkler D. Tissue-resident memory CD8 + T cells cooperate with CD4 + T cells to drive compartmentalized immunopathology in the CNS. Sci Transl Med 2022; 14:eabl6058. [PMID: 35417190 DOI: 10.1126/scitranslmed.abl6058] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In chronic inflammatory diseases of the central nervous system (CNS), immune cells persisting behind the blood-brain barrier are supposed to promulgate local tissue destruction. The drivers of such compartmentalized inflammation remain unclear, but tissue-resident memory T cells (TRM) represent a potentially important cellular player in this process. Here, we investigated whether resting CD8+ TRM persisting after cleared infection with attenuated lymphocytic choriomeningitis virus (LCMV) can initiate immune responses directed against cognate self-antigen in the CNS. We demonstrated that time-delayed conditional expression of the LCMV glycoprotein as neo-self-antigen by glia cells reactivated CD8+ TRM. Subsequently, CD8+ TRM expanded and initiated CNS inflammation and immunopathology in an organ-autonomous manner independently of circulating CD8+ T cells. However, in the absence of CD4+ T cells, TCF-1+ CD8+ TRM failed to expand and differentiate into terminal effectors. Similarly, in human demyelinating CNS autoimmune lesions, we found CD8+ T cells expressing TCF-1 that predominantly exhibited a TRM-like phenotype. Together, our study provides evidence for CD8+ TRM-driven CNS immunopathology and sheds light on why inflammatory processes may evade current immunomodulatory treatments in chronic autoimmune CNS conditions.
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Affiliation(s)
- Ilena Vincenti
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Nicolas Page
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Karin Steinbach
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Alexander Yermanos
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland.,Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland.,Institute of Microbiology, ETH Zurich, 8093 Zurich, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Nicolas Nunez
- Institute of Experimental Immunology, University of Zurich, Zurich 8057, Switzerland
| | - Mario Kreutzfeldt
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland.,Division of Clinical Pathology, Geneva University Hospital, 1211 Geneva, Switzerland
| | - Bogna Klimek
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Giovanni Di Liberto
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Kristof Egervari
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland.,Division of Clinical Pathology, Geneva University Hospital, 1211 Geneva, Switzerland
| | - Margot Piccinno
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Ghazal Shammas
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Alexandre Mariotte
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Nicolas Fonta
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Nicolas Liaudet
- Bioimaging core facility, University of Geneva, 1211 Geneva, Switzerland
| | - Danielle Shlesinger
- Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland
| | - Anna Rita Liuzzi
- Institute of Experimental Immunology, University of Zurich, Zurich 8057, Switzerland
| | - Ingrid Wagner
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Cynthia Saadi
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Christine Stadelmann
- Department of Neuropathology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Sai Reddy
- Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland
| | - Burkhard Becher
- Institute of Experimental Immunology, University of Zurich, Zurich 8057, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland.,Division of Clinical Pathology, Geneva University Hospital, 1211 Geneva, Switzerland
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9
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Roth M, Jaquet V, Lemeille S, Bonetti EJ, Cambet Y, François P, Krause KH. Transcriptomic Analysis of E. coli after Exposure to a Sublethal Concentration of Hydrogen Peroxide Revealed a Coordinated Up-Regulation of the Cysteine Biosynthesis Pathway. Antioxidants (Basel) 2022; 11:antiox11040655. [PMID: 35453340 PMCID: PMC9026346 DOI: 10.3390/antiox11040655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 03/24/2022] [Accepted: 03/25/2022] [Indexed: 12/13/2022] Open
Abstract
Hydrogen peroxide (H2O2) is a key defense component of host-microbe interaction. However, H2O2 concentrations generated by immune cells or epithelia are usually insufficient for bacterial killing and rather modulate bacterial responses. Here, we investigated the impact of sublethal H2O2 concentration on gene expression of E. coli BW25113 after 10 and 60 min of exposure. RNA-seq analysis revealed that approximately 12% of bacterial genes were strongly dysregulated 10 min following exposure to 2.5 mM H2O2. H2O2 exposure led to the activation of a specific antioxidant response and a general stress response. The latter was characterized by a transient down-regulation of genes involved in general metabolism, such as nucleic acid biosynthesis and translation, with a striking and coordinated down-regulation of genes involved in ribosome formation, and a sustained up-regulation of the SOS response. We confirmed the rapid transient and specific response mediated by the transcription factor OxyR leading to up-regulation of antioxidant systems, including the catalase-encoding gene (katG), that rapidly degrade extracellular H2O2 and promote bacterial survival. We documented a strong and transient up-regulation of genes involved in sulfur metabolism and cysteine biosynthesis, which are under the control of the transcription factor CysB. This strong specific transcriptional response to H2O2 exposure had no apparent impact on bacterial survival, but possibly replenishes the stores of oxidized cysteine and glutathione. In summary, our results demonstrate that different stress response mechanisms are activated by H2O2 exposure and highlight the cysteine synthesis as an antioxidant response in E. coli.
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Affiliation(s)
- Myriam Roth
- Department of Pathology and Immunology, Medical School, University of Geneva, 1211 Geneva, Switzerland; (V.J.); (S.L.); (K.-H.K.)
- Correspondence: ; Tel.: +41-223-794-257
| | - Vincent Jaquet
- Department of Pathology and Immunology, Medical School, University of Geneva, 1211 Geneva, Switzerland; (V.J.); (S.L.); (K.-H.K.)
- REaders, Assay Development & Screening Unit (READS Unit), Faculty of Medecine, University of Geneva, 1211 Geneva, Switzerland;
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Medical School, University of Geneva, 1211 Geneva, Switzerland; (V.J.); (S.L.); (K.-H.K.)
| | - Eve-Julie Bonetti
- Genomic Research Laboratory, Infectious Diseases Service, University Hospitals Geneva Medical Center, Michel-Servet 1, 1211 Geneva, Switzerland; (E.-J.B.); (P.F.)
| | - Yves Cambet
- REaders, Assay Development & Screening Unit (READS Unit), Faculty of Medecine, University of Geneva, 1211 Geneva, Switzerland;
| | - Patrice François
- Genomic Research Laboratory, Infectious Diseases Service, University Hospitals Geneva Medical Center, Michel-Servet 1, 1211 Geneva, Switzerland; (E.-J.B.); (P.F.)
| | - Karl-Heinz Krause
- Department of Pathology and Immunology, Medical School, University of Geneva, 1211 Geneva, Switzerland; (V.J.); (S.L.); (K.-H.K.)
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10
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Sakic A, Chaabane C, Ambartsumian N, Klingelhöfer J, Lemeille S, Kwak BR, Grigorian M, Bochaton-Piallat ML. Neutralization of S100A4 induces stabilization of atherosclerotic plaques: role of smooth muscle cells. Cardiovasc Res 2022; 118:141-155. [PMID: 33135065 PMCID: PMC8752361 DOI: 10.1093/cvr/cvaa311] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 10/20/2020] [Indexed: 01/20/2023] Open
Abstract
AIMS During atherosclerosis, smooth muscle cells (SMCs) accumulate in the intima where they switch from a contractile to a synthetic phenotype. From porcine coronary artery, we isolated spindle-shaped (S) SMCs exhibiting features of the contractile phenotype and rhomboid (R) SMCs typical of the synthetic phenotype. S100A4 was identified as a marker of R-SMCs in vitro and intimal SMCs, in pig and man. S100A4 exhibits intra- and extracellular functions. In this study, we investigated the role of extracellular S100A4 in SMC phenotypic transition. METHODS AND RESULTS S-SMCs were treated with oligomeric recombinant S100A4 (oS100A4), which induced nuclear factor (NF)-κB activation. Treatment of S-SMCs with oS100A4 in combination with platelet-derived growth factor (PDGF)-BB induced a complete SMC transition towards a pro-inflammatory R-phenotype associated with NF-κB activation, through toll-like receptor-4. RNA sequencing of cells treated with oS100A4/PDGF-BB revealed a strong up-regulation of pro-inflammatory genes and enrichment of transcription factor binding sites essential for SMC phenotypic transition. In a mouse model of established atherosclerosis, neutralization of extracellular S100A4 decreased area of atherosclerotic lesions, necrotic core, and CD68 expression and increased α-smooth muscle actin and smooth muscle myosin heavy chain expression. CONCLUSION We suggest that the neutralization of extracellular S100A4 promotes the stabilization of atherosclerotic plaques. Extracellular S100A4 could be a new target to influence the evolution of atherosclerotic plaques.
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MESH Headings
- Actins/metabolism
- Animals
- Antibodies, Neutralizing/pharmacology
- Antigens, CD/metabolism
- Antigens, Differentiation, Myelomonocytic/metabolism
- Aorta/drug effects
- Aorta/metabolism
- Aorta/pathology
- Aortic Diseases/drug therapy
- Aortic Diseases/genetics
- Aortic Diseases/metabolism
- Aortic Diseases/pathology
- Atherosclerosis/drug therapy
- Atherosclerosis/genetics
- Atherosclerosis/metabolism
- Atherosclerosis/pathology
- Becaplermin/pharmacology
- Cells, Cultured
- Disease Models, Animal
- Humans
- Mice, Inbred C57BL
- Mice, Knockout, ApoE
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Myosin Heavy Chains/metabolism
- Phenotype
- Plaque, Atherosclerotic
- S100 Calcium-Binding Protein A4/antagonists & inhibitors
- S100 Calcium-Binding Protein A4/metabolism
- S100 Calcium-Binding Protein A4/pharmacology
- Signal Transduction
- Smooth Muscle Myosins/metabolism
- Sus scrofa
- Toll-Like Receptor 4/metabolism
- Mice
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Affiliation(s)
- Antonija Sakic
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Chiraz Chaabane
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Noona Ambartsumian
- Department of Neuroscience, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen, Denmark
| | - Jörg Klingelhöfer
- Department of Neuroscience, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen, Denmark
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Brenda R Kwak
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Mariam Grigorian
- Department of Neuroscience, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen, Denmark
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11
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Morel S, Schilling S, Diagbouga MR, Delucchi M, Bochaton-Piallat ML, Lemeille S, Hirsch S, Kwak BR. Effects of Low and High Aneurysmal Wall Shear Stress on Endothelial Cell Behavior: Differences and Similarities. Front Physiol 2021; 12:727338. [PMID: 34721060 PMCID: PMC8551710 DOI: 10.3389/fphys.2021.727338] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 09/21/2021] [Indexed: 12/13/2022] Open
Abstract
Background: Intracranial aneurysms (IAs) result from abnormal enlargement of the arterial lumen. IAs are mostly quiescent and asymptomatic, but their rupture leads to severe brain damage or death. As the evolution of IAs is hard to predict and intricates medical decision, it is essential to improve our understanding of their pathophysiology. Wall shear stress (WSS) is proposed to influence IA growth and rupture. In this study, we investigated the effects of low and supra-high aneurysmal WSS on endothelial cells (ECs). Methods: Porcine arterial ECs were exposed for 48 h to defined levels of shear stress (2, 30, or 80 dyne/cm2) using an Ibidi flow apparatus. Immunostaining for CD31 or γ-cytoplasmic actin was performed to outline cell borders or to determine cell architecture. Geometry measurements (cell orientation, area, circularity and aspect ratio) were performed on confocal microscopy images. mRNA was extracted for RNAseq analysis. Results: ECs exposed to low or supra-high aneurysmal WSS were more circular and had a lower aspect ratio than cells exposed to physiological flow. Furthermore, they lost the alignment in the direction of flow observed under physiological conditions. The effects of low WSS on differential gene expression were stronger than those of supra-high WSS. Gene set enrichment analysis highlighted that extracellular matrix proteins, cytoskeletal proteins and more particularly the actin protein family were among the protein classes the most affected by shear stress. Interestingly, most genes showed an opposite regulation under both types of aneurysmal WSS. Immunostainings for γ-cytoplasmic actin suggested a different organization of this cytoskeletal protein between ECs exposed to physiological and both types of aneurysmal WSS. Conclusion: Under both aneurysmal low and supra-high WSS the typical arterial EC morphology molds to a more spherical shape. Whereas low WSS down-regulates the expression of cytoskeletal-related proteins and up-regulates extracellular matrix proteins, supra-high WSS induces opposite changes in gene expression of these protein classes. The differential regulation in EC gene expression observed under various WSS translate into a different organization of the ECs’ architecture. This adaptation of ECs to different aneurysmal WSS conditions may affect vascular remodeling in IAs.
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Affiliation(s)
- Sandrine Morel
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Neurosurgery Division, Department of Clinical Neurosciences, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Sabine Schilling
- Institute of Applied Simulation, Zurich University of Applied Sciences, Wädenswil, Switzerland.,Institute of Tourism and Mobility, Lucerne School of Business, Lucerne University of Applied Sciences and Arts, Lucerne, Switzerland
| | - Mannekomba R Diagbouga
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Matteo Delucchi
- Institute of Applied Simulation, Zurich University of Applied Sciences, Wädenswil, Switzerland
| | | | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Sven Hirsch
- Institute of Applied Simulation, Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - Brenda R Kwak
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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12
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Vu DL, Martinez-Murillo P, Pigny F, Vono M, Meyer B, Eberhardt CS, Lemeille S, Von Dach E, Blanchard-Rohner G, Eckerle I, Huttner A, Siegrist CA, Kaiser L, Didierlaurent AM. Longitudinal Analysis of Inflammatory Response to SARS-CoV-2 in the Upper Respiratory Tract Reveals an Association with Viral Load, Independent of Symptoms. J Clin Immunol 2021; 41:1723-1732. [PMID: 34581925 PMCID: PMC8476983 DOI: 10.1007/s10875-021-01134-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 09/05/2021] [Indexed: 12/23/2022]
Abstract
Background SARS-CoV-2 infection leads to high viral loads in the upper respiratory tract that may be determinant in virus dissemination. The extent of intranasal antiviral response in relation to symptoms is unknown. Understanding how local innate responses control virus is key in the development of therapeutic approaches. Methods SARS-CoV-2-infected patients were enrolled in an observational study conducted at the Geneva University Hospitals, Switzerland, investigating virological and immunological characteristics. Nasal wash and serum specimens from a subset of patients were collected to measure viral load, IgA specific for the S1 domain of the spike protein, and a cytokine panel at different time points after infection; cytokine levels were analyzed in relation to symptoms. Results Samples from 13 SARS-CoV-2-infected patients and six controls were analyzed. We found an increase in CXCL10 and IL-6, whose levels remained elevated for up to 3 weeks after symptom onset. SARS-CoV-2 infection also induced CCL2 and GM-CSF, suggesting local recruitment and activation of myeloid cells. Local cytokine levels correlated with viral load but not with serum cytokine levels, nor with specific symptoms, including anosmia. Some patients had S1-specific IgA in the nasal cavity while almost none had IgG. Conclusion The nasal epithelium is an active site of cytokine response against SARS-CoV-2 that can last more than 2 weeks; in this mild COVID-19 cohort, anosmia was not associated with increases in any locally produced cytokines. Supplementary Information The online version contains supplementary material available at 10.1007/s10875-021-01134-z.
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Affiliation(s)
- Diem-Lan Vu
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland.
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland.
- University of Geneva Medical School, Geneva, Switzerland.
| | - Paola Martinez-Murillo
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Fiona Pigny
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- University of Geneva Medical School, Geneva, Switzerland
| | - Maria Vono
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Benjamin Meyer
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Christiane S Eberhardt
- University of Geneva Medical School, Geneva, Switzerland
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Elodie Von Dach
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- University of Geneva Medical School, Geneva, Switzerland
| | - Géraldine Blanchard-Rohner
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
- Unit of Immunology and Vaccinology, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Isabella Eckerle
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Angela Huttner
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- University of Geneva Medical School, Geneva, Switzerland
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Claire-Anne Siegrist
- University of Geneva Medical School, Geneva, Switzerland
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland
| | - Laurent Kaiser
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- University of Geneva Medical School, Geneva, Switzerland
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
| | - Arnaud M Didierlaurent
- Department of Pathology and Immunology, Faculty of Medicine, Center of Vaccinology, University of Geneva, Geneva, Switzerland.
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland.
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13
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Diagbouga MR, Morel S, Cayron AF, Haemmerli J, Georges M, Hierck BP, Allémann E, Lemeille S, Bijlenga P, Kwak BR. Primary cilia control endothelial permeability by regulating expression and location of junction proteins. Cardiovasc Res 2021; 118:1583-1596. [PMID: 33974072 PMCID: PMC9074981 DOI: 10.1093/cvr/cvab165] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 05/09/2021] [Indexed: 12/12/2022] Open
Abstract
Aims Wall shear stress (WSS) determines intracranial aneurysm (IA) development. Polycystic kidney disease (PKD) patients have a high IA incidence and risk of rupture. Dysfunction/absence of primary cilia in PKD endothelial cells (ECs) may impair mechano-transduction of WSS and favour vascular disorders. The molecular links between primary cilia dysfunction and IAs are unknown. Methods and results Wild-type and primary cilia-deficient Tg737orpk/orpk arterial ECs were submitted to physiological (30 dynes/cm2) or aneurysmal (2 dynes/cm2) WSS, and unbiased transcriptomics were performed. Tg737orpk/orpk ECs displayed a fivefold increase in the number of WSS-responsive genes compared to wild-type cells. Moreover, we observed a lower trans-endothelial resistance and a higher endothelial permeability, which correlated with disorganized intercellular junctions in Tg737orpk/orpk cells. We identified ZO-1 as a central regulator of primary cilia-dependent endothelial junction integrity. Finally, clinical and histological characteristics of IAs from non-PKD and PKD patients were analysed. IAs in PKD patients were more frequently located in the middle cerebral artery (MCA) territory than in non-PKD patients. IA domes from the MCA of PKD patients appeared thinner with less collagen and reduced endothelial ZO-1 compared with IA domes from non-PKD patients. Conclusion Primary cilia dampen the endothelial response to aneurysmal low WSS. In absence of primary cilia, ZO-1 expression levels are reduced, which disorganizes intercellular junctions resulting in increased endothelial permeability. This altered endothelial function may not only contribute to the severity of IA disease observed in PKD patients, but may also serve as a potential diagnostic tool to determine the vulnerability of IAs.
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Affiliation(s)
| | - Sandrine Morel
- Department of Pathology and Immunology.,Department of Clinical Neurosciences-Neurosurgery Division, Faculty of Medicine, University of Geneva, Switzerland
| | - Anne F Cayron
- Department of Pathology and Immunology.,School of Pharmaceutical Sciences, University of Geneva, Switzerland.,Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland
| | - Julien Haemmerli
- Department of Clinical Neurosciences-Neurosurgery Division, Faculty of Medicine, University of Geneva, Switzerland
| | - Marc Georges
- Department of Clinical Neurosciences-Neurosurgery Division, Faculty of Medicine, University of Geneva, Switzerland
| | - Beerend P Hierck
- Department of Anatomy and Embryology, Leiden University Medical Center, the Netherlands
| | - E Allémann
- School of Pharmaceutical Sciences, University of Geneva, Switzerland.,Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Switzerland
| | | | - Philippe Bijlenga
- Department of Clinical Neurosciences-Neurosurgery Division, Faculty of Medicine, University of Geneva, Switzerland
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14
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Badaoui M, Zoso A, Idris T, Bacchetta M, Simonin J, Lemeille S, Wehrle-Haller B, Chanson M. Vav3 Mediates Pseudomonas aeruginosa Adhesion to the Cystic Fibrosis Airway Epithelium. Cell Rep 2021; 32:107842. [PMID: 32640241 DOI: 10.1016/j.celrep.2020.107842] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 04/13/2020] [Accepted: 06/09/2020] [Indexed: 01/08/2023] Open
Abstract
Pseudomonas aeruginosa (Pa) represents the leading cause of airway infection in cystic fibrosis (CF). Early airways colonization can be explained by enhanced adhesion of Pa to the respiratory epithelium. RNA sequencing (RNA-seq) on fully differentiated primary cultures of airway epithelial cells from CF and non-CF donors predict that VAV3, β1 INTEGRIN, and FIBRONECTIN genes are significantly enriched in CF. Indeed, Vav3 is apically overexpressed in CF, associates with active β1 integrin luminally exposed, and increases fibronectin deposition. These luminal microdomains, rich in fibronectin and β1 integrin and regulated by Vav3, mediate the increased Pa adhesion to the CF epithelium. Interestingly, Vav3 inhibition normalizes the CF-dependent fibronectin and β1-integrin ectopic expression, improves the CF epithelial integrity, and prevents the enhanced Pa trapping to the CF epithelium. Through its capacity to promote a luminal complex with active β1 integrin and fibronectin that favors bacteria trapping, Vav3 may represent a new target in CF.
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Affiliation(s)
- Mehdi Badaoui
- Faculty of Medicine, Department of Pediatrics, Gynecology & Obstetrics, University of Geneva, Geneva 1211, Switzerland; Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland
| | - Alice Zoso
- Faculty of Medicine, Department of Pediatrics, Gynecology & Obstetrics, University of Geneva, Geneva 1211, Switzerland; Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland
| | - Tahir Idris
- Faculty of Medicine, Department of Pediatrics, Gynecology & Obstetrics, University of Geneva, Geneva 1211, Switzerland; Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland
| | - Marc Bacchetta
- Faculty of Medicine, Department of Pediatrics, Gynecology & Obstetrics, University of Geneva, Geneva 1211, Switzerland; Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland
| | - Juliette Simonin
- Faculty of Medicine, Department of Pediatrics, Gynecology & Obstetrics, University of Geneva, Geneva 1211, Switzerland; Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland
| | - Sylvain Lemeille
- Faculty of Medicine, Department of Pathology and Immunology, University of Geneva, Geneva 1211, Switzerland
| | - Bernhard Wehrle-Haller
- Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland
| | - Marc Chanson
- Faculty of Medicine, Department of Pediatrics, Gynecology & Obstetrics, University of Geneva, Geneva 1211, Switzerland; Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva 1211, Switzerland.
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15
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Sakic A, Chaabane C, Ambartsumian N, Klingelhöfer J, Lemeille S, Kwak B, Grigorian M, Bochaton-Piallat ML. Neutralization of S100A4 induces stabilization of atherosclerotic plaques: role of smooth muscle cells. Atherosclerosis 2020. [DOI: 10.1016/j.atherosclerosis.2020.10.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Vetter P, Eberhardt CS, Meyer B, Martinez Murillo PA, Torriani G, Pigny F, Lemeille S, Cordey S, Laubscher F, Vu DL, Calame A, Schibler M, Jacquerioz F, Blanchard-Rohner G, Siegrist CA, Kaiser L, Didierlaurent AM, Eckerle I. Daily Viral Kinetics and Innate and Adaptive Immune Response Assessment in COVID-19: a Case Series. mSphere 2020; 5:e00827-20. [PMID: 33177214 PMCID: PMC7657589 DOI: 10.1128/msphere.00827-20] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 10/22/2020] [Indexed: 01/08/2023] Open
Abstract
Viral shedding patterns and their correlations with immune responses are still poorly characterized in mild coronavirus (CoV) disease 2019 (COVID-19). We monitored shedding of viral RNA and infectious virus and characterized the immune response kinetics of the first five patients quarantined in Geneva, Switzerland. High viral loads and infectious virus shedding were observed from the respiratory tract despite mild symptoms, with isolation of infectious virus and prolonged positivity by reverse transcriptase PCR (RT-PCR) until days 7 and 19 after symptom onset, respectively. Robust innate responses characterized by increases in activated CD14+ CD16+ monocytes and cytokine responses were observed as early as 2 days after symptom onset. Cellular and humoral severe acute respiratory syndrome (SARS)-CoV-2-specific adaptive responses were detectable in all patients. Infectious virus shedding was limited to the first week after symptom onset. A strong innate response, characterized by mobilization of activated monocytes during the first days of infection and SARS-CoV-2-specific antibodies, was detectable even in patients with mild disease.IMPORTANCE This work is particularly important because it simultaneously assessed the virology, immunology, and clinical presentation of the same subjects, whereas other studies assess these separately. We describe the detailed viral and immune profiles of the first five patients infected by SARS-CoV-2 and quarantined in Geneva, Switzerland. Viral loads peaked at the very beginning of the disease, and infectious virus was shed only during the early acute phase of disease. No infectious virus could be isolated by culture 7 days after onset of symptoms, while viral RNA was still detectable for a prolonged period. Importantly, we saw that all patients, even those with mild symptoms, mount an innate response sufficient for viral control (characterized by early activated cytokines and monocyte responses) and develop specific immunity as well as cellular and humoral SARS-CoV-2-specific adaptive responses, which already begin to decline a few months after the resolution of symptoms.
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Affiliation(s)
- Pauline Vetter
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Christiane S Eberhardt
- Center for Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
- Division of General Pediatrics, Geneva University Hospitals, Geneva, Switzerland
- Emory Vaccine Center, Emory University, Atlanta, Georgia, USA
| | - Benjamin Meyer
- Center for Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Paola Andrea Martinez Murillo
- Center for Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Giulia Torriani
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Fiona Pigny
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Sylvain Lemeille
- Center for Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Samuel Cordey
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Florian Laubscher
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Diem-Lan Vu
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Adrien Calame
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Manuel Schibler
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Frederique Jacquerioz
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Géraldine Blanchard-Rohner
- Center for Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
- Division of General Pediatrics, Geneva University Hospitals, Geneva, Switzerland
| | - Claire-Anne Siegrist
- Center for Vaccinology, Department of Pathology and Immunology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
- Division of General Pediatrics, Geneva University Hospitals, Geneva, Switzerland
| | - Laurent Kaiser
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Arnaud M Didierlaurent
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Emory Vaccine Center, Emory University, Atlanta, Georgia, USA
| | - Isabella Eckerle
- Geneva Centre for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland
- Division of Infectious Diseases, Geneva University Hospitals, Geneva, Switzerland
- Laboratory of Virology, Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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17
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Lemeille S, Paschaki M, Baas D, Morlé L, Duteyrat JL, Ait-Lounis A, Barras E, Soulavie F, Jerber J, Thomas J, Zhang Y, Holtzman MJ, Kistler WS, Reith W, Durand B. Interplay of RFX transcription factors 1, 2 and 3 in motile ciliogenesis. Nucleic Acids Res 2020; 48:9019-9036. [PMID: 32725242 PMCID: PMC7498320 DOI: 10.1093/nar/gkaa625] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 07/08/2020] [Accepted: 07/16/2020] [Indexed: 12/16/2022] Open
Abstract
Cilia assembly is under strict transcriptional control during animal development. In vertebrates, a hierarchy of transcription factors (TFs) are involved in controlling the specification, differentiation and function of multiciliated epithelia. RFX TFs play key functions in the control of ciliogenesis in animals. Whereas only one RFX factor regulates ciliogenesis in C. elegans, several distinct RFX factors have been implicated in this process in vertebrates. However, a clear understanding of the specific and redundant functions of different RFX factors in ciliated cells remains lacking. Using RNA-seq and ChIP-seq approaches we identified genes regulated directly and indirectly by RFX1, RFX2 and RFX3 in mouse ependymal cells. We show that these three TFs have both redundant and specific functions in ependymal cells. Whereas RFX1, RFX2 and RFX3 occupy many shared genomic loci, only RFX2 and RFX3 play a prominent and redundant function in the control of motile ciliogenesis in mice. Our results provide a valuable list of candidate ciliary genes. They also reveal stunning differences between compensatory processes operating in vivo and ex vivo.
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Affiliation(s)
- Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Marie Paschaki
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Dominique Baas
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Laurette Morlé
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Jean-Luc Duteyrat
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Aouatef Ait-Lounis
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Emmanuèle Barras
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Fabien Soulavie
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Julie Jerber
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Joëlle Thomas
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
| | - Yong Zhang
- Department of Medicine and Department of Cell Biology, Washington University School of Medicine, St. Louis, Missouri
| | - Michael J Holtzman
- Department of Medicine and Department of Cell Biology, Washington University School of Medicine, St. Louis, Missouri
| | - W Stephen Kistler
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, United States of America
| | - Walter Reith
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Bénédicte Durand
- Univ Lyon, Université Claude Bernard Lyon-1, CNRS UMR-5310, INSERM U-1217, Institut NeuroMyoGène, F-69008, Lyon, France
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18
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Sofoluwe A, Zoso A, Bacchetta M, Lemeille S, Chanson M. Immune response of polarized cystic fibrosis airway epithelial cells infected with Influenza A virus. J Cyst Fibros 2020; 20:655-663. [PMID: 32873524 DOI: 10.1016/j.jcf.2020.08.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 08/05/2020] [Accepted: 08/23/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Cystic fibrosis (CF), a genetic disease caused by mutations of the cystic fibrosis transmembrane conductance regulator (CFTR) gene, is characterized by dysfunction of the immune response in the airway epithelium that leads to prolonged infection, colonization and exacerbated inflammation. In this study, we determined the gene expression profile of airway epithelial cells knockdown for CFTR (CFTR KD) in response to bacterial and viral challenges. METHODS In a first approach, polarized CFTR KD and their control counterpart (CFTR CTL) cells were stimulated with P. aeruginosa-derived virulence factor flagellin. Next, we developed a model of Influenza A virus (IAV) infection in CTL and CFTR KD polarized cells. mRNA was collected for transcriptome analysis. RESULTS Beside the expected pro-inflammatory response, Gene Set Enrichment Analysis highlighted key molecular pathways and players involved in IAV and anti-viral interferon signaling. Although IAV replication was similar in both cell types, multiplex gene expression analysis revealed changes of key immune genes dependent on time of infection that were found to be CFTR-dependent and/or IAV-dependent. Interferons are key signaling proteins/cytokines in the antibacterial and antiviral response. To evaluate their impact on the altered gene expression profile in CFTR responses to pathogens, we measured transcriptome changes after exposure to Type I-, Type II- and Type III-interferons. CONCLUSIONS Our findings reveal target genes in understanding the defective immune response in the CF airway epithelium in the context of viral infection. Information provided in this study would be useful to understand the dysfunctional immune response of the CF airway epithelium during infection.
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Affiliation(s)
- Aderonke Sofoluwe
- Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva, Switzerland
| | - Alice Zoso
- Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva, Switzerland
| | - Marc Bacchetta
- Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva, Switzerland
| | - Sylvain Lemeille
- Faculty of Medicine, Department of Pathology & Immunology, University of Geneva, Geneva, Switzerland
| | - Marc Chanson
- Faculty of Medicine, Department of Cell Physiology & Metabolism, University of Geneva, Geneva, Switzerland.
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19
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Goldstein JD, Bassoy EY, Caruso A, Palomo J, Rodriguez E, Lemeille S, Gabay C. IL-36 signaling in keratinocytes controls early IL-23 production in psoriasis-like dermatitis. Life Sci Alliance 2020; 3:e202000688. [PMID: 32345660 PMCID: PMC7190273 DOI: 10.26508/lsa.202000688] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/15/2020] [Accepted: 04/16/2020] [Indexed: 01/04/2023] Open
Abstract
IL-36R signaling plays an important role in the pathogenesis of psoriasis. We ought to assess the specific function of IL-36R in keratinocytes for the pathology of Aldara-induced psoriasis-like dermatitis. Il36r ΔK mice presenting deletion of IL-36R in keratinocytes were similarly resistant to Aldara-induced ear inflammation as Il36r -/- mice, but acanthosis was only prevented in Il36r -/- mice. FACS analysis revealed that IL-36R signaling in keratinocytes is mandatory for early neutrophil infiltration in Aldara-treated ears. RNASeq and qRT-PCR experiments demonstrated the crucial role of IL-36R signaling in keratinocytes for induction of IL-23, IL-17, and IL-22 at early time points. Taken together, our results demonstrate that IL-36R signaling in keratinocytes plays a major role in the induction of Aldara-induced psoriasis-like dermatitis by triggering early production of IL-23/IL-17/IL-22 cytokines and neutrophil infiltration.
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Affiliation(s)
- Jérémie D Goldstein
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
| | - Esen Y Bassoy
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
| | - Assunta Caruso
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
| | - Jennifer Palomo
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
| | - Emiliana Rodriguez
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
| | - Cem Gabay
- Department of Pathology-Immunology, University of Geneva Faculty of Medicine, Geneva, Switzerland
- Division of Rheumatology, Department of Medicine, University Hospitals of Geneva, Geneva, Switzerland
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20
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Ronzoni FL, Lemeille S, Kuzyakiv R, Sampaolesi M, Jaconi ME. Human fetal mesoangioblasts reveal tissue-dependent transcriptional signatures. Stem Cells Transl Med 2020; 9:575-589. [PMID: 31975556 PMCID: PMC7180296 DOI: 10.1002/sctm.19-0209] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 12/22/2019] [Indexed: 01/01/2023] Open
Abstract
Mesoangioblasts (MABs) derived from adult skeletal muscles are well‐studied adult stem/progenitor cells that already entered clinical trials for muscle regeneration in genetic diseases; however, the transcriptional identity of human fetal MABs (fMABs) remains largely unknown. Herein we analyzed the transcriptome of MABs isolated according to canonical markers from fetal atrium, ventricle, aorta, and skeletal muscles (from 9.5 to 13 weeks of age) to uncover specific gene signatures correlating with their peculiar myogenic differentiation properties inherent to their tissue of origin. RNA‐seq analysis revealed for the first time that human MABs from fetal aorta, cardiac (atrial and ventricular), and skeletal muscles display subsets of differentially expressed genes likely representing distinct expression signatures indicative of their original tissue. Identified GO biological processes and KEGG pathways likely account for their distinct differentiation outcomes and provide a set of critical genes possibly predicting future specific differentiation outcomes. This study reveals novel information regarding the potential of human fMABs that may help to improve specific differentiation outcomes relevant for therapeutic muscle regeneration.
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Affiliation(s)
- Flavio L Ronzoni
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Rostyslav Kuzyakiv
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Maurilio Sampaolesi
- Stem Cell Institute, KU Leuven, Leuven, Belgium.,Department of Public Health, Forensic and Experimental Medicine, University of Pavia, Pavia, Italy.,Center for Health Technologies (CHT), University of Pavia, Pavia, Italy
| | - Marisa E Jaconi
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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21
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Blaskovic S, Donati Y, Zanetti F, Ruchonnet-Métrailler I, Lemeille S, Cremona TP, Schittny JC, Barazzone-Argiroffo C. Gestation and lactation exposure to nicotine induces transient postnatal changes in lung alveolar development. Am J Physiol Lung Cell Mol Physiol 2020; 318:L606-L618. [PMID: 31967849 DOI: 10.1152/ajplung.00228.2019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Harmful consequences of cigarette smoke (CS) exposure during lung development can already manifest in infancy. In particular, early life exposure to nicotine, the main component of CS, was shown to affect lung development in animal models. We aimed to characterize the effect of nicotine on alveoli formation. We analyzed the kinetics of normal alveolar development during the alveolarization phase and then looked at the effect of nicotine in a mouse model of gestational and early life exposure. Immunohistochemical staining revealed that the wave of cell proliferation [i.e., vascular endothelial cells, alveolar epithelial cells (AEC) type II and mesenchymal cell] occurs at postnatal day (pnd) 8 in control and nicotine-exposed lungs. However, FACS analysis of individual epithelial alveolar cells revealed nicotine-induced transient increase of AEC type I proliferation and decrease of vascular endothelial cell proliferation at pnd8. Furthermore, nicotine increased the percentage of endothelial cells at pnd2. Transcriptomic data also showed significant changes in nicotine samples compared with the controls on cell cycle-associated genes at pnd2 but not anymore at pnd16. Accordingly, the expression of survivin, involved in cell cycle regulation, also follows a different kinetics in nicotine lung extracts. These changes resulted in an increased lung size detected by stereology at pnd16 but no longer in adult age, suggesting that nicotine can act on the pace of lung maturation. Taken together, our results indicate that early life nicotine exposure could be harmful to alveolar development independently from other toxicants contained in CS.
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Affiliation(s)
- Sanja Blaskovic
- Department of Pediatrics, Gynecology, and Obstetrics, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Switzerland
| | - Yves Donati
- Department of Pediatrics, Gynecology, and Obstetrics, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Switzerland
| | - Filippo Zanetti
- Department of Pediatrics, Gynecology, and Obstetrics, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Switzerland
| | - Isabelle Ruchonnet-Métrailler
- Department of Pediatrics, Gynecology, and Obstetrics, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Switzerland
| | - Tiziana P Cremona
- Molecular and Integrative Physiological Sciences Program, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
| | | | - Constance Barazzone-Argiroffo
- Department of Pediatrics, Gynecology, and Obstetrics, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Switzerland
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22
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Martin P, Palmer G, Rodriguez E, Palomo J, Lemeille S, Goldstein J, Gabay C. Intracellular IL-1 Receptor Antagonist Isoform 1 Released from Keratinocytes upon Cell Death Acts as an Inhibitor for the Alarmin IL-1α. J Immunol 2020; 204:967-979. [PMID: 31932497 DOI: 10.4049/jimmunol.1901074] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 11/25/2019] [Indexed: 01/26/2023]
Abstract
The inflammatory effects of IL-1α/β are controlled by IL-1R antagonist (IL-1Ra). One IL-1Ra isoform is secreted, whereas three other isoforms (intracellular IL-1Ra [icIL-1Ra] 1, 2, and 3) are supposed to remain intracellular because of the absence of a signal peptide. In contrast to the well-characterized function of the secreted isoform, the biological role of the intracellular isoforms remains largely unclear. icIL-1Ra1 represents the major isoform in keratinocytes. We created icIL-1Ra1-/- mice and investigated the role of icIL-1Ra1 in Aldara (5% imiquimod)-induced psoriasis-like skin inflammation. Naive icIL-1Ra1-/- mice bred habitually and exhibited a normal phenotype. icIL-1Ra1 deficiency aggravated Aldara-induced skin inflammation, as demonstrated by increased ear thickness and increased mRNA levels of key proinflammatory cytokines. No intracellular effect of icIL-1Ra1 could be detected in isolated keratinocytes using RNA-sequencing analysis; however, Aldara treatment led to caspase 1/11-, caspase 8-, and RIPK3-independent keratinocyte cell death accompanied by the release of both icIL-1Ra1 and IL-1α. Furthermore, blocking IL-1α attenuated the clinical severity of Aldara-induced ear thickening in icIL-1Ra1-/- mice. Our data suggest that upon keratinocyte damage icIL-1Ra1 acts extracellularly as an antagonist of the alarmin IL-1α to immediately counteract its inflammatory effects.
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Affiliation(s)
- Praxedis Martin
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and.,Division of Rheumatology, Department of Internal Medicine Specialties, University Hospitals, 1211 Geneva 4, Switzerland
| | - Gaby Palmer
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and.,Division of Rheumatology, Department of Internal Medicine Specialties, University Hospitals, 1211 Geneva 4, Switzerland
| | - Emiliana Rodriguez
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and.,Division of Rheumatology, Department of Internal Medicine Specialties, University Hospitals, 1211 Geneva 4, Switzerland
| | - Jennifer Palomo
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and.,Division of Rheumatology, Department of Internal Medicine Specialties, University Hospitals, 1211 Geneva 4, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and
| | - Jérémie Goldstein
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and.,Division of Rheumatology, Department of Internal Medicine Specialties, University Hospitals, 1211 Geneva 4, Switzerland
| | - Cem Gabay
- Department of Pathology and Immunology, School of Medicine, University of Geneva, 1211 Geneva 4, Switzerland; and .,Division of Rheumatology, Department of Internal Medicine Specialties, University Hospitals, 1211 Geneva 4, Switzerland
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23
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Martí i Líndez AA, Dunand-Sauthier I, Conti M, Gobet F, Núñez N, Hannich JT, Riezman H, Geiger R, Piersigilli A, Hahn K, Lemeille S, Becher B, De Smedt T, Hugues S, Reith W. Mitochondrial arginase-2 is a cell‑autonomous regulator of CD8+ T cell function and antitumor efficacy. JCI Insight 2019; 4:132975. [PMID: 31751318 DOI: 10.1172/jci.insight.132975] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 11/13/2019] [Indexed: 01/21/2023] Open
Abstract
As sufficient extracellular arginine is crucial for T cell function, depletion of extracellular arginine by elevated arginase 1 (Arg1) activity has emerged as a hallmark immunosuppressive mechanism. However, the potential cell-autonomous roles of arginases in T cells have remained unexplored. Here, we show that the arginase isoform expressed by T cells, the mitochondrial Arg2, is a cell-intrinsic regulator of CD8+ T cell activity. Both germline Arg2 deletion and adoptive transfer of Arg2-/- CD8+ T cells significantly reduced tumor growth in preclinical cancer models by enhancing CD8+ T cell activation, effector function, and persistence. Transcriptomic, proteomic, and high-dimensional flow cytometry characterization revealed a CD8+ T cell-intrinsic role of Arg2 in modulating T cell activation, antitumor cytoxicity, and memory formation, independently of extracellular arginine availability. Furthermore, specific deletion of Arg2 in CD8+ T cells strongly synergized with PD-1 blockade for the control of tumor growth and animal survival. These observations, coupled with the finding that pharmacologic arginase inhibition accelerates activation of ex vivo human T cells, unveil Arg2 as a potentially new therapeutic target for T cell-based cancer immunotherapies.
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Affiliation(s)
| | - Isabelle Dunand-Sauthier
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Mark Conti
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Florian Gobet
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Nicolás Núñez
- Institute of Experimental Immunology, University of Zurich, Zurich, Switzerland
| | - J Thomas Hannich
- Department of Biochemistry, NCCR Chemical Biology, University of Geneva, Geneva, Switzerland
| | - Howard Riezman
- Department of Biochemistry, NCCR Chemical Biology, University of Geneva, Geneva, Switzerland
| | - Roger Geiger
- Institute for Research in Biomedicine, Università della Svizzera italiana, Bellinzona, Switzerland
| | - Alessandra Piersigilli
- Histology Core Facility, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.,Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Kerstin Hahn
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Burkhard Becher
- Institute of Experimental Immunology, University of Zurich, Zurich, Switzerland
| | - Thibaut De Smedt
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Stéphanie Hugues
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Walter Reith
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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24
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Page N, Klimek B, De Roo M, Steinbach K, Soldati H, Lemeille S, Wagner I, Kreutzfeldt M, Di Liberto G, Vincenti I, Lingner T, Salinas G, Brück W, Simons M, Murr R, Kaye J, Zehn D, Pinschewer DD, Merkler D. Expression of the DNA-Binding Factor TOX Promotes the Encephalitogenic Potential of Microbe-Induced Autoreactive CD8 + T Cells. Immunity 2019; 50:763. [PMID: 30893589 DOI: 10.1016/j.immuni.2019.02.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Denis JF, Diagbouga MR, Molica F, Hautefort A, Linnerz T, Watanabe M, Lemeille S, Bertrand JY, Kwak BR. KLF4-Induced Connexin40 Expression Contributes to Arterial Endothelial Quiescence. Front Physiol 2019; 10:80. [PMID: 30809154 PMCID: PMC6379456 DOI: 10.3389/fphys.2019.00080] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 01/24/2019] [Indexed: 12/11/2022] Open
Abstract
Shear stress, a blood flow-induced frictional force, is essential in the control of endothelial cell (EC) homeostasis. High laminar shear stress (HLSS), as observed in straight parts of arteries, assures a quiescent non-activated endothelium through the induction of Krüppel-like transcription factors (KLFs). Connexin40 (Cx40)-mediated gap junctional communication is known to contribute to a healthy endothelium by propagating anti-inflammatory signals between ECs, however, the molecular basis of the transcriptional regulation of Cx40 as well as its downstream effectors remain poorly understood. Here, we show that flow-induced KLF4 regulated Cx40 expression in a mouse EC line. Chromatin immunoprecipitation in ECs revealed that KLF4 bound to three predicted KLF consensus binding sites in the Cx40 promoter. HLSS-dependent induction of Cx40 expression was confirmed in primary human ECs. The downstream effects of Cx40 modulation in ECs exposed to HLSS were elucidated by an unbiased transcriptomics approach. Cell cycle progression was identified as an important downstream target of Cx40 under HLSS. In agreement, an increase in the proportion of proliferating cell nuclear antigen (PCNA)-positive ECs and a decrease in the proportion of ECs in the G0/G1 phase were observed under HLSS after Cx40 silencing. Transfection of communication-incompetent HeLa cells with Cx40 demonstrated that the regulation of proliferation by Cx40 was not limited to ECs. Using a zebrafish model, we finally showed faster intersegmental vessel growth and branching into the dorsal longitudinal anastomotic vessel in embryos knock-out for the Cx40 orthologs Cx41.8 and Cx45.6. Most significant effects were observed in embryos with a mutant Cx41.8 encoding for a channel with reduced gap junctional function. Faster intersegmental vessel growth in Cx41.8 mutant embryos was associated with increased EC proliferation as assessed by PH3 immunostaining. Our data shows a novel evolutionary-conserved role of flow-driven KLF4-dependent Cx40 expression in endothelial quiescence that may be relevant for the control of atherosclerosis and diseases involving sprouting angiogenesis.
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Affiliation(s)
- Jean-François Denis
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | | | - Filippo Molica
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Aurélie Hautefort
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Tanja Linnerz
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | | | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Julien Y Bertrand
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Brenda R Kwak
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland.,Department of Medical Specializations - Cardiology, University of Geneva, Geneva, Switzerland
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26
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Page N, Klimek B, De Roo M, Steinbach K, Soldati H, Lemeille S, Wagner I, Kreutzfeldt M, Di Liberto G, Vincenti I, Lingner T, Salinas G, Brück W, Simons M, Murr R, Kaye J, Zehn D, Pinschewer DD, Merkler D. Expression of the DNA-Binding Factor TOX Promotes the Encephalitogenic Potential of Microbe-Induced Autoreactive CD8 + T Cells. Immunity 2019; 48:937-950.e8. [PMID: 29768177 DOI: 10.1016/j.immuni.2018.04.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 11/30/2017] [Accepted: 04/02/2018] [Indexed: 12/11/2022]
Abstract
Infections are thought to trigger CD8+ cytotoxic T lymphocyte (CTL) responses during autoimmunity. However, the transcriptional programs governing the tissue-destructive potential of CTLs remain poorly defined. In a model of central nervous system (CNS) inflammation, we found that infection with lymphocytic choriomeningitis virus (LCMV), but not Listeria monocytogenes (Lm), drove autoimmunity. The DNA-binding factor TOX was induced in CTLs during LCMV infection and was essential for their encephalitogenic properties, and its expression was inhibited by interleukin-12 during Lm infection. TOX repressed the activity of several transcription factors (including Id2, TCF-1, and Notch) that are known to drive CTL differentiation. TOX also reduced immune checkpoint sensitivity by restraining the expression of the inhibitory checkpoint receptor CD244 on the surface of CTLs, leading to increased CTL-mediated damage in the CNS. Our results identify TOX as a transcriptional regulator of tissue-destructive CTLs in autoimmunity, offering a potential mechanistic link to microbial triggers.
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Affiliation(s)
- Nicolas Page
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Bogna Klimek
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Mathias De Roo
- Department of Anesthesiology, Pharmacology and Intensive Care, Geneva University Hospital, Switzerland; Department of Basic Neuroscience, University of Geneva Medical School, Geneva, Switzerland
| | - Karin Steinbach
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Hadrien Soldati
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Ingrid Wagner
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Mario Kreutzfeldt
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Giovanni Di Liberto
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Ilena Vincenti
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Thomas Lingner
- Microarray and Deep-Sequencing Core Facility, University Medical Center Göttingen, Göttingen, Germany
| | - Gabriela Salinas
- Microarray and Deep-Sequencing Core Facility, University Medical Center Göttingen, Göttingen, Germany
| | - Wolfgang Brück
- Institute of Neuropathology, Georg-August University Göttingen, 37075 Göttingen, Germany
| | - Mikael Simons
- Institute of Neuronal Cell Biology, Technical University Munich, Munich, Germany; German Center for Neurodegenerative Disease, 6250 Munich, Germany; Munich Cluster for Systems Neurology, 81377 Munich, Germany
| | - Rabih Murr
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland; Institute for Genetics and Genomics in Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - Jonathan Kaye
- Research Division of Immunology, Departments of Biomedical Sciences and Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Dietmar Zehn
- Division of Animal Physiology and Immunology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Daniel D Pinschewer
- Division of Experimental Virology, Department of Biomedicine, Haus Petersplatz, University of Basel, Basel, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland; Division of Clinical Pathology, Geneva University Hospital, Geneva, Switzerland.
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Humbert M, Guery L, Brighouse D, Lemeille S, Hugues S. Intratumoral CpG-B Promotes Antitumoral Neutrophil, cDC, and T-cell Cooperation without Reprograming Tolerogenic pDC. Cancer Res 2018; 78:3280-3292. [PMID: 29588348 DOI: 10.1158/0008-5472.can-17-2549] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 02/13/2018] [Accepted: 03/22/2018] [Indexed: 11/16/2022]
Abstract
Cancer immunotherapies utilize distinct mechanisms to harness the power of the immune system to eradicate cancer cells. Therapeutic vaccines, aimed at inducing active immune responses against an existing cancer, are highly dependent on the immunological microenvironment, where many immune cell types display high levels of plasticity and, depending on the context, promote very different immunologic outcomes. Among them, plasmacytoid dendritic cells (pDC), known to be highly immunogenic upon inflammation, are maintained in a tolerogenic state by the tumor microenvironment. Here, we report that intratumoral (i.t.) injection of established solid tumors with CpG oligonucleotides-B (CpG-B) inhibits tumor growth. Interestingly, control of tumor growth was independent of tumor-associated pDC, which remained refractory to CpG-B stimulation and whose depletion did not alter the efficacy of the treatment. Instead, tumor growth inhibition subsequent to i.t. CpG-B injection depended on the recruitment of neutrophils into the milieu, resulting in the activation of conventional dendritic cells, subsequent increased antitumor T-cell priming in draining lymph nodes, and enhanced effector T-cell infiltration in the tumor microenvironment. These results reinforce the concept that i.t. delivery of TLR9 agonists alters the tumor microenvironment by improving the antitumor activity of both innate and adaptive immune cells.Significance: Intratumoral delivery of CpG-B disrupts the tolerogenic tumor microenvironment and inhibits tumor growth. Cancer Res; 78(12); 3280-92. ©2018 AACR.
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Affiliation(s)
- Marion Humbert
- Department of Pathology and Immunology, University of Geneva Medical School, Geneva, Switzerland
| | - Leslie Guery
- Department of Pathology and Immunology, University of Geneva Medical School, Geneva, Switzerland
| | - Dale Brighouse
- Department of Pathology and Immunology, University of Geneva Medical School, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva Medical School, Geneva, Switzerland
| | - Stephanie Hugues
- Department of Pathology and Immunology, University of Geneva Medical School, Geneva, Switzerland.
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28
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Fernandez M, Sutterlüty-Fall H, Schwärzler C, Lemeille S, Boehncke WH, Merat R. Overexpression of the human antigen R suppresses the immediate paradoxical proliferation of melanoma cell subpopulations in response to suboptimal BRAF inhibition. Cancer Med 2017; 6:1652-1664. [PMID: 28573821 PMCID: PMC5504324 DOI: 10.1002/cam4.1091] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 04/07/2017] [Accepted: 04/11/2017] [Indexed: 12/15/2022] Open
Abstract
Tumor plasticity and the heterogeneous response of melanoma cells to targeted therapies are major limits for the long‐term efficacy of this line of therapy. Targeting tumor plasticity is theoretically possible through the modulation of the expression of RNA‐binding proteins which can affect many different compensatory mechanisms of the adaptive response of malignant cells to targeted therapies. Human antigen R (HuR) is a modulator of gene expression and a transacting factor in the mRNA‐processing machinery used in the cell stress response, and is a potential target for reducing tumor plasticity. In this experiment, we exploit the inherent heterogeneous response of the A375 melanoma line to suboptimal BRAF inhibition as a model of immediate adaptive response. We first observe that HuR overexpression can prevent the heterogeneous response and thus the immediate paradoxical proliferation induced by low‐doses vemurafenib treatment. We then use single‐cell mass cytometry to characterize subpopulations, including those that paradoxically proliferate, based on their proliferation rate and the expression patterns of markers involved in the reversible adaptive resistance to BRAF inhibition and/or recognized as HuR targets involved in cell cycle regulation. Under suboptimal BRAF inhibition, HuR overexpression affects these subpopulations and their expression pattern with contrasting responses depending on their proliferation rate: faster‐proliferating vemurafenib‐sensitive or ‐resistant subpopulations showed higher death tendency and reduced size, and slower‐proliferating subpopulations showed an attenuated resistant expression response and their paradoxical proliferation was inhibited. These observations pave the way to new therapeutic strategies for preventing the heterogeneous response of tumors to targeted therapies.
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Affiliation(s)
- Marylise Fernandez
- Department of Pathology and Immunology, University of Geneva, Switzerland
| | | | - Christoph Schwärzler
- Flow Cytometry Core Facility, Ecole Polytechnique Fédérale de Lausanne, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva, Switzerland
| | - Wolf-Henning Boehncke
- Department of Pathology and Immunology, University of Geneva, Switzerland.,Division of Dermatology, University Hospital of Geneva, Switzerland
| | - Rastine Merat
- Department of Pathology and Immunology, University of Geneva, Switzerland.,Division of Dermatology, University Hospital of Geneva, Switzerland
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29
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Giraud C, Hausmann S, Lemeille S, Prados J, Redder P, Linder P. The C-terminal region of the RNA helicase CshA is required for the interaction with the degradosome and turnover of bulk RNA in the opportunistic pathogen Staphylococcus aureus. RNA Biol 2015; 12:658-74. [PMID: 25997461 PMCID: PMC4615653 DOI: 10.1080/15476286.2015.1035505] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Staphylococcus aureus is a versatile opportunistic pathogen that adapts readily to a variety of different growth conditions. This adaptation requires a rapid regulation of gene expression including the control of mRNA abundance. The CshA DEAD-box RNA helicase was previously shown to be required for efficient turnover of the agr quorum sensing mRNA. Here we show by transcriptome-wide RNA sequencing and microarray analyses that CshA is required for the degradation of bulk mRNA. Moreover a subset of mRNAs is significantly stabilised in absence of CshA. Deletion of the C-terminal extension affects RNA turnover similar to the full deletion of the cshA gene. In accordance with RNA decay data, the C-terminal region of CshA is required for an RNA-independent interaction with components of the RNA degradation machinery. The C-terminal truncation of CshA reduces its ATPase activity and this reduction cannot be compensated at high RNA concentrations. Finally, the deletion of the C-terminal extension does affect growth at low temperatures, but to a significantly lesser degree than the full deletion, indicating that the core of the helicase can assume a partial function and opening the possibility that CshA is involved in different cellular processes.
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Affiliation(s)
- Caroline Giraud
- a Department of Microbiology and Molecular Medicine ; Medical Faculty; University of Geneva ; Michel Servet , Geneva , Switzerland
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30
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Yingping F, Lemeille S, González A, Risoul V, Denis Y, Richaud P, Lamrabet O, Fillat MF, Zhang CC, Latifi A. The Pkn22 Ser/Thr kinase in Nostoc PCC 7120: role of FurA and NtcA regulators and transcript profiling under nitrogen starvation and oxidative stress. BMC Genomics 2015. [PMID: 26220092 PMCID: PMC4518582 DOI: 10.1186/s12864-015-1703-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background The filamentous cyanobacterium Nostoc sp. strain PCC 7120 can fix N2 when combined nitrogen is not available. Furthermore, it has to cope with reactive oxygen species generated as byproducts of photosynthesis and respiration. We have previously demonstrated the synthesis of Ser/Thr kinase Pkn22 as an important survival response of Nostoc to oxidative damage. In this study we wished to investigate the possible involvement of this kinase in signalling peroxide stress and nitrogen deprivation. Results Quantitative RT-PCR experiments revealed that the pkn22 gene is induced in response to peroxide stress and to combined nitrogen starvation. Electrophoretic motility assays indicated that the pkn22 promoter is recognized by the global transcriptional regulators FurA and NtcA. Transcriptomic analysis comparing a pkn22-insertion mutant and the wild type strain indicated that this kinase regulates genes involved in important cellular functions such as photosynthesis, carbon metabolism and iron acquisition. Since metabolic changes may lead to oxidative stress, we investigated whether this is the case with nitrogen starvation. Our results rather invalidate this hypothesis thereby suggesting that the function of Pkn22 under nitrogen starvation is independent of its role in response to peroxide stress. Conclusions Our analyses have permitted a more complete functional description of Ser/Thr kinase in Nostoc. We have decrypted the transcriptional regulation of the pkn22 gene, and analysed the whole set of genes under the control of this kinase in response to the two environmental changes often encountered by cyanobacteria in their natural habitat: oxidative stress and nitrogen deprivation. Electronic supplementary material The online version of this article (doi:10.1186/s12864-015-1703-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Fan Yingping
- Aix-Marseille University and CNRS, Laboratoire de Chimie Bactérienne - UMR7283, IMM, 31 Chemin Joseph Aiguier, 13402, Marseille cedex 20, France.
| | - Sylvain Lemeille
- Department of Microbiology and Molecular Medicine, CMU, Medical Faculty, University of Geneva, Genève, 1211, Switzerland.
| | - Andrés González
- Departamento de Bioquímica y Biología Molecular y Celular, Universidad de Zaragoza, 50009, Zaragoza, Spain.
| | - Véronique Risoul
- Aix-Marseille University and CNRS, Laboratoire de Chimie Bactérienne - UMR7283, IMM, 31 Chemin Joseph Aiguier, 13402, Marseille cedex 20, France.
| | - Yann Denis
- Plate-forme Transcriptome FR3479, IMM-CNRS, Marseille, France.
| | - Pierre Richaud
- CEA, DSV, IBEB, SBVME, Saint-Paul-lez-Durance, F-13108, France. .,CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France. .,Aix Marseille Université, BVME UMR7265, Marseille, F-13284, France.
| | - Otmane Lamrabet
- Aix-Marseille University and CNRS, Laboratoire de Chimie Bactérienne - UMR7283, IMM, 31 Chemin Joseph Aiguier, 13402, Marseille cedex 20, France.
| | - Maria F Fillat
- Departamento de Bioquímica y Biología Molecular y Celular, Universidad de Zaragoza, 50009, Zaragoza, Spain.
| | - Cheng-Cai Zhang
- Aix-Marseille University and CNRS, Laboratoire de Chimie Bactérienne - UMR7283, IMM, 31 Chemin Joseph Aiguier, 13402, Marseille cedex 20, France.
| | - Amel Latifi
- Aix-Marseille University and CNRS, Laboratoire de Chimie Bactérienne - UMR7283, IMM, 31 Chemin Joseph Aiguier, 13402, Marseille cedex 20, France.
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31
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Kistler WS, Baas D, Lemeille S, Paschaki M, Seguin-Estevez Q, Barras E, Ma W, Duteyrat JL, Morlé L, Durand B, Reith W. RFX2 Is a Major Transcriptional Regulator of Spermiogenesis. PLoS Genet 2015; 11:e1005368. [PMID: 26162102 PMCID: PMC4498915 DOI: 10.1371/journal.pgen.1005368] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 06/17/2015] [Indexed: 11/21/2022] Open
Abstract
Spermatogenesis consists broadly of three phases: proliferation of diploid germ cells, meiosis, and finally extensive differentiation of the haploid cells into effective delivery vehicles for the paternal genome. Despite detailed characterization of many haploid developmental steps leading to sperm, only fragmentary information exists on the control of gene expression underlying these processes. Here we report that the RFX2 transcription factor is a master regulator of genes required for the haploid phase. A targeted mutation of Rfx2 was created in mice. Rfx2-/- mice are perfectly viable but show complete male sterility. Spermatogenesis appears to progress unperturbed through meiosis. However, haploid cells undergo a complete arrest in spermatid development just prior to spermatid elongation. Arrested cells show altered Golgi apparatus organization, leading to a deficit in the generation of a spreading acrosomal cap from proacrosomal vesicles. Arrested cells ultimately merge to form giant multinucleated cells released to the epididymis. Spermatids also completely fail to form the flagellar axoneme. RNA-Seq analysis and ChIP-Seq analysis identified 139 genes directly controlled by RFX2 during spermiogenesis. Gene ontology analysis revealed that genes required for cilium function are specifically enriched in down- and upregulated genes showing that RFX2 allows precise temporal expression of ciliary genes. Several genes required for cell adhesion and cytoskeleton remodeling are also downregulated. Comparison of RFX2-regulated genes with those controlled by other major transcriptional regulators of spermiogenesis showed that each controls independent gene sets. Altogether, these observations show that RFX2 plays a major and specific function in spermiogenesis. Failure of spermatogenesis, which is presumed to often result from genetic defects, is a common cause of male sterility. Although numerous genes associated with defects in male spermatogenesis have been identified, numerous cases of genetic male infertility remain unelucidated. We report here that the transcription factor RFX2 is a master regulator of gene expression programs required for progression through the haploid phase of spermatogenesis. Male RFX2-deficient mice are completely sterile. Spermatogenesis progresses through meiosis, but haploid cells undergo a complete block in development just prior to spermatid elongation. Gene expression profiling and ChIP-Seq analysis revealed that RFX2 controls key pathways implicated in cilium/flagellum formation, as well as genes implicated in microtubule and vesicle associated transport. The set of genes activated by RFX2 in spermatids exhibits virtually no overlap with those controlled by other known transcriptional regulators of spermiogenesis, establishing RFX2 as an essential new player in this developmental process. RFX2-deficient mice should therefore represent a valuable new model for deciphering the regulatory networks that direct sperm formation, and thereby contribute to the identification of causes of human male infertility.
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Affiliation(s)
- W. Stephen Kistler
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, United States of America
- * E-mail: (WSK); (BD)
| | - Dominique Baas
- Centre de Génétique et de Physiologie Moléculaire et Cellulaire, CNRS UMR 5534, Université Claude Bernard Lyon-1, Villeurbanne, Lyon, France
| | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Marie Paschaki
- Centre de Génétique et de Physiologie Moléculaire et Cellulaire, CNRS UMR 5534, Université Claude Bernard Lyon-1, Villeurbanne, Lyon, France
| | - Queralt Seguin-Estevez
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Emmanuèle Barras
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
| | - Wenli Ma
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, United States of America
| | - Jean-Luc Duteyrat
- Centre de Génétique et de Physiologie Moléculaire et Cellulaire, CNRS UMR 5534, Université Claude Bernard Lyon-1, Villeurbanne, Lyon, France
| | - Laurette Morlé
- Centre de Génétique et de Physiologie Moléculaire et Cellulaire, CNRS UMR 5534, Université Claude Bernard Lyon-1, Villeurbanne, Lyon, France
| | - Bénédicte Durand
- Centre de Génétique et de Physiologie Moléculaire et Cellulaire, CNRS UMR 5534, Université Claude Bernard Lyon-1, Villeurbanne, Lyon, France
- * E-mail: (WSK); (BD)
| | - Walter Reith
- Department of Pathology and Immunology, University of Geneva Medical School, CMU, Geneva, Switzerland
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Yingping F, Lemeille S, Talla E, Janicki A, Denis Y, Zhang CC, Latifi A. Unravelling the cross-talk between iron starvation and oxidative stress responses highlights the key role of PerR (alr0957) in peroxide signalling in the cyanobacterium Nostoc PCC 7120. Environ Microbiol Rep 2014; 6:468-475. [PMID: 25646537 DOI: 10.1111/1758-2229.12157] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The cyanobacterial phylum includes oxygenic photosynthetic prokaryotes of a wide variety of morphologies, metabolisms and ecologies. Their adaptation to their various ecological niches is mainly achieved by sophisticated regulatory mechanisms and depends on a fine cross-talk between them. We assessed the global transcriptomic response of the filamentous cyanobacterium Nostoc PCC 7120 to iron starvation and oxidative stress. More than 20% of the differentially expressed genes in response to iron stress were also responsive to oxidative stress. These transcripts include antioxidant proteins-encoding genes that confirms that iron depletion leads to reactive oxygen accumulation. The activity of the Fe-superoxide dismutase was not significantly decreased under iron starvation, indicating that the oxidative stress generated under iron deficiency is not a consequence of (SOD) deficiency. The transcriptional data indicate that the adaptation of Nostoc to iron-depleted conditions displays important differences with what has been shown in unicellular cyanobacteria. While the FurA protein that regulates the response to iron deprivation has been well characterized in Nostoc, the regulators in charge of the oxidative stress response are unknown. Our study indicates that the alr0957 (perR) gene encodes the master regulator of the peroxide stress. PerR is a peroxide-sensor repressor that senses peroxide by metal-catalysed oxidation.
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Seguín-Estévez Q, Dunand-Sauthier I, Lemeille S, Iseli C, Ibberson M, Ioannidis V, Schmid CD, Rousseau P, Barras E, Geinoz A, Xenarios I, Acha-Orbea H, Reith W. Extensive remodeling of DC function by rapid maturation-induced transcriptional silencing. Nucleic Acids Res 2014; 42:9641-55. [PMID: 25104025 PMCID: PMC4150779 DOI: 10.1093/nar/gku674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The activation, or maturation, of dendritic cells (DCs) is crucial for the initiation of adaptive T-cell mediated immune responses. Research on the molecular mechanisms implicated in DC maturation has focused primarily on inducible gene-expression events promoting the acquisition of new functions, such as cytokine production and enhanced T-cell-stimulatory capacity. In contrast, mechanisms that modulate DC function by inducing widespread gene-silencing remain poorly understood. Yet the termination of key functions is known to be critical for the function of activated DCs. Genome-wide analysis of activation-induced histone deacetylation, combined with genome-wide quantification of activation-induced silencing of nascent transcription, led us to identify a novel inducible transcriptional-repression pathway that makes major contributions to the DC-maturation process. This silencing response is a rapid primary event distinct from repression mechanisms known to operate at later stages of DC maturation. The repressed genes function in pivotal processes--including antigen-presentation, extracellular signal detection, intracellular signal transduction and lipid-mediator biosynthesis--underscoring the central contribution of the silencing mechanism to rapid reshaping of DC function. Interestingly, promoters of the repressed genes exhibit a surprisingly high frequency of PU.1-occupied sites, suggesting a novel role for this lineage-specific transcription factor in marking genes poised for inducible repression.
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Affiliation(s)
- Queralt Seguín-Estévez
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
| | - Isabelle Dunand-Sauthier
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
| | - Christian Iseli
- Vital-IT, Swiss Institute of Bioinformatics, CH-1015 Lausanne, Switzerland
| | - Mark Ibberson
- Vital-IT, Swiss Institute of Bioinformatics, CH-1015 Lausanne, Switzerland
| | | | - Christoph D Schmid
- Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, CH-4051 Basel, Switzerland University of Basel, CH-4051 Basel, Switzerland
| | - Philippe Rousseau
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
| | - Emmanuèle Barras
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
| | - Antoine Geinoz
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
| | - Ioannis Xenarios
- Vital-IT, Swiss Institute of Bioinformatics, CH-1015 Lausanne, Switzerland
| | - Hans Acha-Orbea
- Department of Biochemistry, Faculty of Biology and Medicine, University of Lausanne, CH-1066 Epalinges, Switzerland
| | - Walter Reith
- Department of Pathology and Immunology, University of Geneva Medical School, CH-1211 Geneva, Switzerland
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Linder P, Lemeille S, Redder P. Transcriptome-wide analyses of 5'-ends in RNase J mutants of a gram-positive pathogen reveal a role in RNA maturation, regulation and degradation. PLoS Genet 2014; 10:e1004207. [PMID: 24586213 PMCID: PMC3937233 DOI: 10.1371/journal.pgen.1004207] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 01/13/2014] [Indexed: 11/19/2022] Open
Abstract
RNA decay and maturation have in recent years been recognised as major regulatory mechanisms in bacteria. In contrast to Escherichia coli, the Firmicute (Gram-positive) bacteria often do not encode the well-studied endonuclease RNase E, but instead rely on the endonucleases RNase Y, RNase J1 and RNase J2, of which the latter two have additionally been shown to have 5' to 3' exonucleolytic activity. We have previously demonstrated that these RNases could be deleted individually in the pathogenic Firmicute Staphylococcus aureus; however, we here present that, outside a narrow permissive window of growth conditions, deleting one or both of the RNase J genes presents serious difficulties for the cell. Moreover, an active site mutant of RNase J1 behaved like a deletion, whereas no phenotypes were detected for the RNase J2 active site mutant. Furthermore, in order to study the in vivo enzymatic activity of RNase J1 and J2, a method was developed to map the exact 5'-ends of mature and processed RNA, on a global scale. An enrichment of 5' RNA ends could be seen in the RNase J mutants, suggesting that their exonucleolytic activity is crucial for normal degradation of bulk RNA. Using the data to examine specific RNAs, we demonstrated that RNase J activity is needed for correct 5' maturation of both the 16S rRNA and the RNase P ribozyme, and can also inactivate the latter, possibly as quality control. Additional examples show that RNase J perform initial cleavages, apparently competing with ribosomes for access to mRNAs. The novel 5' mapping assay offers an exceptionally detailed view of RNase activity, and reveals that the roles of RNase J proteins are diverse, ranging from maturation and post-transcriptional regulation to degradation.
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Affiliation(s)
- Patrick Linder
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Sylvain Lemeille
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Peter Redder
- Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- * E-mail:
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35
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Rochaix JD, Lemeille S, Shapiguzov A, Samol I, Fucile G, Willig A, Goldschmidt-Clermont M. Protein kinases and phosphatases involved in the acclimation of the photosynthetic apparatus to a changing light environment. Philos Trans R Soc Lond B Biol Sci 2013; 367:3466-74. [PMID: 23148273 DOI: 10.1098/rstb.2012.0064] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Photosynthetic organisms are subjected to frequent changes in light quality and quantity and need to respond accordingly. These acclimatory processes are mediated to a large extent through thylakoid protein phosphorylation. Recently, two major thylakoid protein kinases have been identified and characterized. The Stt7/STN7 kinase is mainly involved in the phosphorylation of the LHCII antenna proteins and is required for state transitions. It is firmly associated with the cytochrome b(6)f complex, and its activity is regulated by the redox state of the plastoquinone pool. The other kinase, Stl1/STN8, is responsible for the phosphorylation of the PSII core proteins. Using a reverse genetics approach, we have recently identified the chloroplast PPH1/TAP38 and PBPC protein phosphatases, which counteract the activity of STN7 and STN8 kinases, respectively. They belong to the PP2C-type phosphatase family and are conserved in land plants and algae. The picture that emerges from these studies is that of a complex regulatory network of chloroplast protein kinases and phosphatases that is involved in light acclimation, in maintenance of the plastoquinone redox poise under fluctuating light and in the adjustment to metabolic needs.
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Affiliation(s)
- Jean-David Rochaix
- Departments of Molecular Biology and Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, Geneva 4, Switzerland.
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Pulimeno P, Mannic T, Sage D, Giovannoni L, Salmon P, Lemeille S, Giry-Laterriere M, Unser M, Bosco D, Bauer C, Morf J, Halban P, Philippe J, Dibner C. Autonomous and self-sustained circadian oscillators displayed in human islet cells. Diabetologia 2013; 56:497-507. [PMID: 23242133 PMCID: PMC3563957 DOI: 10.1007/s00125-012-2779-7] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 10/18/2012] [Indexed: 12/11/2022]
Abstract
AIMS/HYPOTHESIS Following on from the emerging importance of the pancreas circadian clock on islet function and the development of type 2 diabetes in rodent models, we aimed to examine circadian gene expression in human islets. The oscillator properties were assessed in intact islets as well as in beta cells. METHODS We established a system for long-term bioluminescence recording in cultured human islets, employing lentivector gene delivery of the core clock gene Bmal1 (also known as Arntl)-luciferase reporter. Beta cells were stably labelled using a rat insulin2 promoter fluorescent construct. Single-islet/cell oscillation profiles were measured by combined bioluminescence-fluorescence time-lapse microscopy. RESULTS Human islets synchronised in vitro exhibited self-sustained circadian oscillations of Bmal1-luciferase expression at both the population and single-islet levels, with period lengths of 23.6 and 23.9 h, respectively. Endogenous BMAL1 and CRY1 transcript expression was circadian in synchronised islets over 48 h, and antiphasic to REV-ERBα (also known as NR1D1), PER1, PER2, PER3 and DBP transcript circadian profiles. HNF1A and PDX1 exhibited weak circadian oscillations, in phase with the REV-ERBα transcript. Dispersed islet cells were strongly oscillating as well, at population and single-cell levels. Importantly, beta and non-beta cells revealed oscillatory profiles that were well synchronised with each other. CONCLUSIONS/INTERPRETATION We provide for the first time compelling evidence for high-amplitude cell-autonomous circadian oscillators displayed in human pancreatic islets and in dispersed human islet cells. Moreover, these clocks are synchronised between beta and non-beta cells in primary human islet cell cultures.
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Affiliation(s)
- P. Pulimeno
- Division of Endocrinology, Diabetes and Nutrition, University Hospital of Geneva (HUG), Aile Jura 4-771.2, Rue Gabrielle-Perret-Gentil, 4, CH-1211 Geneva, Switzerland
| | - T. Mannic
- Division of Endocrinology, Diabetes and Nutrition, University Hospital of Geneva (HUG), Aile Jura 4-771.2, Rue Gabrielle-Perret-Gentil, 4, CH-1211 Geneva, Switzerland
| | - D. Sage
- Biomedical Imaging Group, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - L. Giovannoni
- Division of Endocrinology, Diabetes and Nutrition, University Hospital of Geneva (HUG), Aile Jura 4-771.2, Rue Gabrielle-Perret-Gentil, 4, CH-1211 Geneva, Switzerland
| | - P. Salmon
- Department of Neurosciences, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - S. Lemeille
- Division of Endocrinology, Diabetes and Nutrition, University Hospital of Geneva (HUG), Aile Jura 4-771.2, Rue Gabrielle-Perret-Gentil, 4, CH-1211 Geneva, Switzerland
| | - M. Giry-Laterriere
- Department of Neurosciences, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - M. Unser
- Biomedical Imaging Group, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - D. Bosco
- Cell Isolation and Transplantation Centre, University Hospital, Geneva, Switzerland
| | - C. Bauer
- NCCR Frontiers in Genetics, Bioimaging Platform, Sciences II, University of Geneva, Geneva, Switzerland
| | - J. Morf
- Department of Molecular Biology, Sciences II, University of Geneva, Geneva, Switzerland
| | - P. Halban
- Department of Genetic Medicine and Development, University Medical Centre, University of Geneva, Geneva, Switzerland
| | - J. Philippe
- Division of Endocrinology, Diabetes and Nutrition, University Hospital of Geneva (HUG), Aile Jura 4-771.2, Rue Gabrielle-Perret-Gentil, 4, CH-1211 Geneva, Switzerland
| | - C. Dibner
- Division of Endocrinology, Diabetes and Nutrition, University Hospital of Geneva (HUG), Aile Jura 4-771.2, Rue Gabrielle-Perret-Gentil, 4, CH-1211 Geneva, Switzerland
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Lemeille S, Rochaix JD. State transitions at the crossroad of thylakoid signalling pathways. Photosynth Res 2010; 106:33-46. [PMID: 20217232 DOI: 10.1007/s11120-010-9538-8] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Accepted: 02/11/2010] [Indexed: 05/02/2023]
Abstract
In order to maintain optimal photosynthetic activity under a changing light environment, plants and algae need to balance the absorbed light excitation energy between photosystem I and photosystem II through processes called state transitions. Variable light conditions lead to changes in the redox state of the plastoquinone pool which are sensed by a protein kinase closely associated with the cytochrome b(6)f complex. Preferential excitation of photosystem II leads to the activation of the kinase which phosphorylates the light-harvesting system (LHCII), a process which is subsequently followed by the release of LHCII from photosystem II and its migration to photosystem I. The process is reversible as dephosphorylation of LHCII on preferential excitation of photosystem I is followed by the return of LHCII to photosystem II. State transitions involve a considerable remodelling of the thylakoid membranes, and in the case of Chlamydomonas, they allow the cells to switch between linear and cyclic electron flow. In this alga, a major function of state transitions is to adjust the ATP level to cellular demands. Recent studies have identified the thylakoid protein kinase Stt7/STN7 as a key component of the signalling pathways of state transitions and long-term acclimation of the photosynthetic apparatus. In this article, we present a review on recent developments in the area of state transitions.
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Affiliation(s)
- Sylvain Lemeille
- Department of Molecular Biology and Plant Biology, University of Geneva, 30, Quai Ernest Ansermet, 1211 Geneva, Switzerland
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Lemeille S, Turkina MV, Vener AV, Rochaix JD. Stt7-dependent phosphorylation during state transitions in the green alga Chlamydomonas reinhardtii. Mol Cell Proteomics 2010; 9:1281-95. [PMID: 20124224 PMCID: PMC2877987 DOI: 10.1074/mcp.m000020-mcp201] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Indexed: 11/06/2022] Open
Abstract
Photosynthetic organisms are able to adapt to changes in light conditions by balancing the light excitation energy between the light-harvesting systems of photosystem (PS) II and photosystem I to optimize the photosynthetic yield. A key component in this process, called state transitions, is the chloroplast protein kinase Stt7/STN7, which senses the redox state of the plastoquinone pool. Upon preferential excitation of photosystem II, this kinase is activated through the cytochrome b(6)f complex and required for the phosphorylation of the light-harvesting system of photosystem II, a portion of which migrates to photosystem I (state 2). Preferential excitation of photosystem I leads to the inactivation of the kinase and to dephosphorylation of light-harvesting complex (LHC) II and its return to photosystem II (state 1). Here we compared the thylakoid phosphoproteome of the wild-type strain and the stt7 mutant of Chlamydomonas under state 1 and state 2 conditions. This analysis revealed that under state 2 conditions several Stt7-dependent phosphorylations of specific Thr residues occur in Lhcbm1/Lhcbm10, Lhcbm4/Lhcbm6/Lhcbm8/Lhcbm9, Lhcbm3, Lhcbm5, and CP29 located at the interface between PSII and its light-harvesting system. Among the two phosphorylation sites detected specifically in CP29 under state 2, one is Stt7-dependent. This phosphorylation may play a crucial role in the dissociation of CP29 from PSII and/or in its association to PSI where it serves as a docking site for LHCII in state 2. Moreover, Stt7 was required for the phosphorylation of the thylakoid protein kinase Stl1 under state 2 conditions, suggesting the existence of a thylakoid protein kinase cascade. Stt7 itself is phosphorylated at Ser(533) in state 2, but analysis of mutants with a S533A/D change indicated that this phosphorylation is not required for state transitions. Moreover, we also identified phosphorylation sites that are redox (state 2)-dependent but independent of Stt7 and additional phosphorylation sites that are redox-independent.
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Affiliation(s)
- Sylvain Lemeille
- From the ‡Departments of Molecular Biology and Plant Biology, University of Geneva, 1211 Geneva, Switzerland and
| | - Maria V. Turkina
- ¶Division of Cell Biology, Department of Clinical and Experimental Medicine, Linköping University, SE-581 85 Linköping, Sweden
| | - Alexander V. Vener
- ¶Division of Cell Biology, Department of Clinical and Experimental Medicine, Linköping University, SE-581 85 Linköping, Sweden
| | - Jean-David Rochaix
- From the ‡Departments of Molecular Biology and Plant Biology, University of Geneva, 1211 Geneva, Switzerland and
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Lemeille S, Willig A, Depège-Fargeix N, Delessert C, Bassi R, Rochaix JD. Analysis of the chloroplast protein kinase Stt7 during state transitions. PLoS Biol 2009; 7:e45. [PMID: 19260761 PMCID: PMC2650728 DOI: 10.1371/journal.pbio.1000045] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Accepted: 01/12/2009] [Indexed: 11/18/2022] Open
Abstract
State transitions allow for the balancing of the light excitation energy between photosystem I and photosystem II and for optimal photosynthetic activity when photosynthetic organisms are subjected to changing light conditions. This process is regulated by the redox state of the plastoquinone pool through the Stt7/STN7 protein kinase required for phosphorylation of the light-harvesting complex LHCII and for the reversible displacement of the mobile LHCII between the photosystems. We show that Stt7 is associated with photosynthetic complexes including LHCII, photosystem I, and the cytochrome b6f complex. Our data reveal that Stt7 acts in catalytic amounts. We also provide evidence that Stt7 contains a transmembrane region that separates its catalytic kinase domain on the stromal side from its N-terminal end in the thylakoid lumen with two conserved Cys that are critical for its activity and state transitions. On the basis of these data, we propose that the activity of Stt7 is regulated through its transmembrane domain and that a disulfide bond between the two lumen Cys is essential for its activity. The high-light–induced reduction of this bond may occur through a transthylakoid thiol–reducing pathway driven by the ferredoxin-thioredoxin system which is also required for cytochrome b6f assembly and heme biogenesis. To grow optimally, photosynthetic organisms need to constantly adjust to changing light conditions. One of these adjustments, called state transitions, allows light energy to be redistributed between the two photosynthetic reaction center complexes in a cell's chloroplasts. These complexes act in concert with other components of the photosynthetic machinery to turn light energy into cellular energy. A key component in the regulation of state transitions is the chloroplast protein Stt7 (also known as STN7), which can modify other proteins by adding a phosphate group. When light levels change, the oxidation level of a pool of another chloroplast component, plastoquinone, changes, which in turn activates Stt7, inducing it to phosphorylate specific proteins of the light-harvesting complex of one reaction center. As a result, a portion of this light-harvesting complex is transferred from one photosynthetic reaction center to the other, thereby optimizing photosynthetic efficiency. Here, we have addressed the configuration of Stt7 within the thylakoid membrane of the chloroplast and the molecular mechanisms underlying its activation. Our data reveal that the level of Stt7 protein changes drastically under specific environmental conditions, that the protein does not need to be present in a one-to-one ratio with its targets for activity, and that it associates directly with a number of components of the photosynthetic machinery. The protein-modifying domain of Stt7 is exposed to the outer side of the thylakoid membrane, whereas the domain critical for regulation of its activity lies on the inner side of the thylakoid membrane. These results shed light on the molecular mechanisms that allow photosynthetic organisms to adjust to fluctuations in light levels. The Stt7/STN7 chloroplast protein is involved in the phosphorylation and remodeling of the light-harvesting apparatus of photosynthetic organisms and plays a key role in the acclimation of the photosynthetic machinery following changes in light levels.
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Affiliation(s)
- Sylvain Lemeille
- Department of Molecular Biology University of Geneva, Geneva, Switzerland
- Department of Plant Biology, University of Geneva, Geneva, Switzerland
| | - Adrian Willig
- Department of Molecular Biology University of Geneva, Geneva, Switzerland
- Department of Plant Biology, University of Geneva, Geneva, Switzerland
| | - Nathalie Depège-Fargeix
- Department of Molecular Biology University of Geneva, Geneva, Switzerland
- Department of Plant Biology, University of Geneva, Geneva, Switzerland
| | - Christian Delessert
- Department of Molecular Biology University of Geneva, Geneva, Switzerland
- Department of Plant Biology, University of Geneva, Geneva, Switzerland
| | - Roberto Bassi
- University of Verona, Faculty of Sciences, Verona, Italy
| | - Jean-David Rochaix
- Department of Molecular Biology University of Geneva, Geneva, Switzerland
- Department of Plant Biology, University of Geneva, Geneva, Switzerland
- * To whom correspondence should be addressed. E-mail:
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Abstract
We establish here that iron deficiency causes oxidative stress in the cyanobacterium Anabaena sp. strain PCC 7120. Iron starvation leads to a significant increase in reactive oxygen species, whose effect can be abolished by treatment with the antioxidant tempol (4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl). Oxidative stress induced by iron starvation could be a common feature of photosynthetic bacteria.
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Affiliation(s)
- Amel Latifi
- Laboratoire de Chimie Bactérienne, IBSM-CNRS, 31 chemin Joseph Aiguier, 13402 Marseille cedex 20, France.
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Abstract
A major task of contemporary biology is to understand and predict the functioning of regulatory networks. We use expression data to deduce the regulation network connecting the sigma factors of Synechocystis PCC6803, the most global regulators in bacteria. Synechocystis contains one group 1 (SigA) and four group 2 (SigB, SigC, SigD and SigE) sigma factors. From the relative abundance of the sig mRNA measured in the wild-type and the four group 2 sigma mutants, we derive a network of the influences of each sigma factor on the transcription of all other sigma factors. Internal or external stimuli acting on only one of the sigma factors will thus indirectly modify the expression of most of the others. From this model, we predict the control points through which the circadian time modulates the expression of the sigma factors. Our results show that the cross regulation between the group 1 and group 2 sigma factors is very important for the adaptation of the bacterium to different environmental and physiological conditions.
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Affiliation(s)
| | - Amel Latifi
- Laboratoire de chimie bactérienne, IBSM-CNRS31 chemin Joseph Aiguier, 13402 Marseille cedex 20, France
| | - Johannes Geiselmann
- To whom correspondence should be addressed. Tel: +33 4 76 63 74 96; Fax: +33 4 76 63 74 97;
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Abstract
Background The cyanobacterium Synechocystis PCC6803 contains one group 1 (sigA) and four group 2 (sigB, sigC, sigD and sigE) sigma factors. The activity of these multiple sigma factors determines the transcriptional program of this bacterium. We wanted to study the role of the group 2 sigma factors in Synechocystis. We have therefore constructed mutants of each of the group 2 sigma factors and investigated their crosstalk. Results We used quantitative RT-PCR analysis to measure the relative abundance of the sig mRNAs in the four sigma mutants. Our data indicate that a network of mutual transcriptional regulation links the expression of the sigma genes. Accordingly, an environmental stress acting on only one of the sigma factors will indirectly modify the expression of most of the other sigma factors. This was confirmed by the transcriptional analysis of the sig mRNAs as a function of nitrogen starvation. Conclusion Taken together, our observations suggest that the crosstalk regulation between all group 1 and group 2 genes could be important for the adaptation of the bacterium to different environmental and physiological conditions.
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Affiliation(s)
- Sylvain Lemeille
- Laboratoire Adaptation et Pathogénie des Microorganismes, Université Joseph Fourier Bâtiment Jean Roget – Faculté Médecine-Pharmacie. Domaine de la Merci. 38700 La Tronche, France
| | - Johannes Geiselmann
- Laboratoire Adaptation et Pathogénie des Microorganismes, Université Joseph Fourier Bâtiment Jean Roget – Faculté Médecine-Pharmacie. Domaine de la Merci. 38700 La Tronche, France
| | - Amel Latifi
- Laboratoire de chimie bactérienne, IBSM-CNRS, 31 chemin Joseph Aiguier. 13402 Marseille cedex 20, France
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