Lack of tolerogenic CD11c+ cells drives early atherosclerosis [RNA-seq]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE275805 | GEO | 2025/08/31
REPOSITORIES: GEO
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Project description:Atherosclerosis is a chronic disease characterized by both dysregulated lipid metabolism and a sustained inflammatory reaction. To study exuberant inflammation as the main trigger of atherosclerosis, we established a novel in vivo approach to induce predominantly “immune-triggered atherosclerosis” for early atherogenesis independent of lipid dysregulation. Bone marrow from CD11c.DTR-GFP mice, which express the receptor for diphtheria toxin (DT) under control of the CD11c promoter, was transplanted into female C57BL/6 mice, and long-term depletion of antigen-presenting CD11c+ cells following DT administration was achieved without affecting lipid homeostasis. These mice exhibited enhanced atherosclerosis (~300%) in comparison to mice without CD11c+ cell depletion. Interestingly, we observed an altered immune cell composition within the aortic wall, including a decrease in tolerogenic DCs, a shift towards inflammatory Ly6G+/Ly6C+ monocytes and increased CD25+/FoxP3+ T cells, whereby the intracellular cytokine profile showed an increase of TNF- α, INF-γ and IL-17. We furthermore detected a pronounced systemic inflammatory response with increased levels of TNF-α, INFγ, IL-17 and IL-1β. Thus, CD11c+ cells are the decisive cellular brake preventing an exuberant inflammatory response in early atherogenesis. Here, we describe a novel tool for studying the role of immune cells and associated mechanisms in atherosclerosis in mice with intact lipid metabolism.
2025-08-31 | GSE275865 | GEO
Project description:Scavenger receptors Stabilin-1 (Stab1) and Stabilin-2 (Stab2) are preferentially expressed by liver sinusoidal endothelial cells. They mediate the clearance of circulating plasma molecules controlling distant organ homeostasis. Studies suggest that Stab1 and Stab2 may impact atherosclerosis. Although subsets of tissue macrophages also express Stab1, hematopoietic Stab1 deficiency does not modulate atherogenesis. Here, we comprehensively studied how targeting Stab1 and Stab2 affects atherosclerosis. Methods: ApoE-KO mice were interbred with Stab1-KO and Stab2-KO mice and fed a Western diet (WD). For antibody targeting, Ldlr-KO mice were also used. Plasma proteomics were performed in Stabilin-deficient mice and candidates were independently confirmed. Ligand binding studies comprised GST-pull down and endocytosis assays. Plasma proteome effects on monocytes were studied by single cell RNA sequencing in vivo, and by gene expression analyses of Stabilin-ligand-stimulated and plasma-stimulated bone marrow-derived monocytes/macrophages in vitro. Results: Spontaneous and WD-associated atherogenesis was significantly reduced in ApoE-Stab1- and ApoE-Stab2-KO. Similarly, inhibition of Stab1 or Stab2 by monoclonal antibodies significantly reduced WD-associated atherosclerosis in ApoE-KO and Ldlr-KO. While neither plasma lipid levels nor circulating immune cell numbers were decisively altered, plasma proteomics revealed a switch in the plasma proteome, consisting of 231 dysregulated proteins comparing Wildtype with Stab1/2 single and Stab1/2-double KO, and of 43 proteins comparing ApoE-, ApoE-Stab1- and ApoE-Stab2-KO. Among this broad spectrum of common, but also disparate scavenger receptor ligands, Periostin, Reelin and TGFBi, known to modulate atherosclerosis, were independently confirmed as novel circulating ligands of Stab1/2. scRNA-Seq of circulating myeloid cells of ApoE-, ApoE-Stab1- and ApoE-Stab2-KO showed transcriptomic alterations in patrolling (Ccr2-/Cx3cr1++/Ly6Clo) and inflammatory (Ccr2+/Cx3cr1+/Ly6Chi) monocytes including downregulation of pro-atherogenic transcription factor Egr1. Ligand exposure did not alter Egr1 expression in vitro, but exposure of Wildtype bone marrow-derived monocytes/macrophages to plasma from ApoE-Stab1- and ApoE-Stab2-KO mice showed a reverted pro-atherogenic macrophage activation as compared to ApoE-KO plasma including downregulation of Egr1. Conclusions: Inhibition of Stab1/Stab2 mediates an anti-inflammatory switch in the plasma proteome which includes direct Stabilin ligands. The altered plasma proteome suppresses both patrolling and inflammatory macrophages and, thus, systemically protects against atherogenesis. Altogether, anti-Stab1- and anti-Stab2-targeted therapies provide a novel approach for the future treatment of atherosclerosis.
2025-01-21 | PXD029342 | Pride
Project description:Atherosclerosis is a chronic inflammatory disease. Lesion progression is primarily mediated by cells of the monocyte/macrophage lineage. Interleukin-17A is a pro-inflammatory cytokine, which modulates immune cell trafficking and is involved inflammation in (auto)immune and infectious diseases. But the role of IL-17A still remains controversial. In the current study we investigated effects of IL-17A on advanced murine and human atherosclerosis, the common disease phenotype in clinical care. 26-weeks old apolipoprotein E-deficient (Apoe-/-) mice were fed a standard chow diet and treated either with IL-17A mAb (n=15) or irrelevant immunoglobulin (n=10) for 16 weeks. Furthermore, essential mechanisms of IL-17A in atherogenesis were studied in vitro. Inhibition of IL-17A markedly prevented atherosclerotic lesion progression (P=0.001) by reducing inflammatory burden and cellular infiltration (P=0.01) and improved lesion stability (P=0.01). In vitro experiments showed that IL-17A plays a role in chemoattractance, monocyte adhesion, sensitization of antigen-presenting cells toward pathogen-derived TLR4 ligands. Also, IL-17A induced a unique transcriptome pattern in monocyte-derived macrophages distinct from known macrophage types. Stimulation of human carotid plaque tissue ex vivo with IL-17A induced a pro-inflammatory milieu and up-regulation of molecules expressed by the IL-17A-induced macrophage subtype. We here show for the first time that functional blockade of IL-17A prevents atherosclerotic lesion progression and induces plaque stabilization in advanced lesions in Apoe-/- mice. The underlying mechanisms involve reduced inflammation and distinct effects of IL-17A on monocyte / macrophage lineage. In addition, translational experiments underline the relevance for the human system. Effects of IL-17A on human monocyte-derived macrophages were assessed (n=2 per group).
2014-10-01 | E-GEOD-60824 | biostudies-arrayexpress
Project description:Objectives: Pinolenic acid (PNLA), an omega-6 polyunsaturated fatty acid from pine nuts, has anti-inflammatory and anti-atherogenic effects. We aimed to investigate the direct anti-inflammatory effect and anti-atherogenic effects of PNLA on activated purified CD14 monocytes from peripheral blood of patients with rheumatoid arthritis (RA) in vitro. Methods: Flow cytometry was used to assess the proportions of CD14 monocytes expressing TNF-α, IL-6, IL-1β, and IL-8 in purified monocytes from patients with RA after lipopolysaccharide (LPS) stimulation with/without PNLA pre-treatment. The whole genomic transcriptome (WGT) profile of PNLA-treated, and LPS-activated monocytes from patients with active RA was investigated by RNA-sequencing. Results: PNLA reduced percentage of monocytes expressing cytokines: TNF-a by 23% (p=0.048), IL-6 by 25% (p=0.011), IL-1B by 23% (p=0.050), IL-8 by 20% (p=0.066). Pathway analysis identified upstream activation of peroxisomes proliferator-activated receptors (PPARs), sirtuin3, and let7miRNA, KLF15 which are anti-inflammatory and antioxidative. In contrast, DAP3, LIF and STAT3, which are involved in TNF-a, and IL-6 signal transduction, were inhibited. Canonical Pathway analysis showed that PNLA inhibited oxidative phosphorylation (p=9.14E-09) and mitochondrial dysfunction (p=4.18E-08), while the sirtuin (SIRTs) signalling pathway was activated (p=8.89E-06) which interfere with the pathophysiologic process of atherosclerosis. Many miRNAs were modulated by PNLA suggesting potential post-transcriptional regulation of metabolic and immune response that has not been described previously. Multiple miRNAs target pyruvate dehydrogenase kinase-4 (PDK4), single-immunoglobulin interleukin-1 receptor molecule (SIGIRR), mitochondrially encoded ATP synthase membrane subunit 6 (MT-ATP6) and Acetyl-CoA Acyltranferase2 (ACAA2); genes implicated in regulation of lipid and cell metabolism, inflammation, and mitochondrial dysfunction. Conclusion: PNLA has potential anti-atherogenic and immune-metabolic effects on monocytes that are pathogenic in RA and atherosclerosis. Dietary PNLA supplementation regulates key miRNAs that are involved in metabolic, mitochondrial, and inflammatory pathways.
2022-03-24 | E-MTAB-11585 | biostudies-arrayexpress
Project description:Exciting discoveries related to IL-1R/TLR signaling in development of atherosclerosis plaque have triggered intense interest in the molecular mechanisms by which innate immune signaling modulates the onset and development of atherosclerosis. Previous studies have clearly shown the definitive role of proinflammatory cytokine IL-1 in the development of atherosclerosis. Recent studies have provided direct evidence supporting a link between innate immunity and atherogenesis. While it is still controversial about whether infectious pathogens contribute to cardiovascular diseases, direct genetic evidence indicates the importance of IL-1R/TLR signaling in atherogenesis. In this study, we examined the role of IRAK4 kinase activity in modified LDL-mediated signaling using bone marrow-derived macrophage as well as in vivo model of atherosclerosis. First, we found that the IRAK4 kinase activity was required for modified LDL-induced NFκB activation and expression of a subset of proinflammatory genes, but not for the activation of MAPKs in bonemarrow-derived macrophage. IRAK4 kinase inactive knock-in (IRAK4KI) mice were bred onto ApoE-/- mice to generate IRAK4KI/ApoE-/- mice. Importantly, the aortic sinus lesion formation was impaired in IRAK4KI/ApoE-/- mice compared to that in ApoE-/- mice. Furthermore, proinflammatory cytokine production was reduced in the aortic sinus region of IRAK4KI/ApoE-/- mice compared to that in ApoE-/- mice. Taken together, our results indicate that the IRAK4 kinase plays an important role in modified LDL-mediated signaling and the development of atherosclerosis, suggesting that pharmacological inhibition of IRAK4 kinase activity might be a feasible approach in the development of anti-atherosclerosis drugs. To identify global changes in gene expression, we examined gene expression profiles of macrophages from wild-type and IRAK4 kinase-inactive knock-in mice in response to acLDL stimulation using the Illumina microarray with probes for 23,000 transcripts. Bone marrow-derived macrophages from wild-type and IRAK4 kinase-inactive knock-in mice were treated with acLDL for 24 hours.
2010-10-23 | E-GEOD-24894 | biostudies-arrayexpress
Project description:Exciting discoveries related to IL-1R/TLR signaling in development of atherosclerosis plaque have triggered intense interest in the molecular mechanisms by which innate immune signaling modulates the onset and development of atherosclerosis. Previous studies have clearly shown the definitive role of proinflammatory cytokine IL-1 in the development of atherosclerosis. Recent studies have provided direct evidence supporting a link between innate immunity and atherogenesis. While it is still controversial about whether infectious pathogens contribute to cardiovascular diseases, direct genetic evidence indicates the importance of IL-1R/TLR signaling in atherogenesis. In this study, we examined the role of IRAK4 kinase activity in modified LDL-mediated signaling using bone marrow-derived macrophage as well as in vivo model of atherosclerosis. First, we found that the IRAK4 kinase activity was required for modified LDL-induced NFκB activation and expression of a subset of proinflammatory genes, but not for the activation of MAPKs in bonemarrow-derived macrophage. IRAK4 kinase inactive knock-in (IRAK4KI) mice were bred onto ApoE-/- mice to generate IRAK4KI/ApoE-/- mice. Importantly, the aortic sinus lesion formation was impaired in IRAK4KI/ApoE-/- mice compared to that in ApoE-/- mice. Furthermore, proinflammatory cytokine production was reduced in the aortic sinus region of IRAK4KI/ApoE-/- mice compared to that in ApoE-/- mice. Taken together, our results indicate that the IRAK4 kinase plays an important role in modified LDL-mediated signaling and the development of atherosclerosis, suggesting that pharmacological inhibition of IRAK4 kinase activity might be a feasible approach in the development of anti-atherosclerosis drugs.
2010-10-23 | GSE24894 | GEO
Project description:Developing strategies that promote the resolution of vascular inflammation and atherosclerosis remains a major therapeutic challenge. Here, we show that exosomes produced by naive bone marrow-derived macrophages (BMDM-exo) contain anti-inflammatory microRNA-99a/146b/378a that are further increased in exosomes produced by BMDM polarized with IL-4 (BMDM-IL-4-exo). These exosomal microRNAs suppress inflammation by targeting NF-kB and TNF-a signaling and foster M2 polarization in recipient macrophages. Repeated infusions of BMDM-IL-4-exo into Apoe_x0001_/_x0001_ mice fed a Western diet reduce excessive hematopoiesis in the bone marrow and thereby the number of myeloid cells in the circulation and macrophages in aortic root lesions. This also leads to a reduction in necrotic lesion areas that collectively stabilize atheroma. Thus, BMDM-IL-4-exo may represent a useful therapeutic approach for atherosclerosis and other inflammatory disorders by targeting NF-kB and TNF-a via microRNA cargo delivery.
2020-08-06 | GSE155745 | GEO
Project description:Dendritic cells (DCs) and macrophages (MPs) are important for immunological homeostasis in the colon. We found that F4/80hi CX3CR1hi (CD11b+CD103-) cells account for 80% of mouse colonic lamina propria (cLP) MHC-IIhi cells. Both CD11c+ and CD11c- cells within this population were identified as MPs based on multiple criteria, including a MP transcriptome revealed by microarray analysis. These MPs constitutively released high levels of IL-10 at least partially in response to the microbiota via an MyD88-independent mechanism. In contrast, cells expressing low to intermediate levels of F4/80 and CX3CR1 were identified as DCs, based on phenotypic and functional analysis and comprise three separate CD11chi cell populations: CD103+CX3CR1-CD11b- DCs, CD103+CX3CR1-CD11b+ DCs and CD103-CX3CR1intCD11b+ DCs. In non-inflammatory conditions, Ly6Chi monocytes differentiated primarily into CD11c+, but not CD11c- MPs. In contrast, during colitis, Ly6Chi monocytes massively invaded the colon and differentiated into pro-inflammatory CD103-CX3CR1intCD11b+ DCs, which produced high levels of IL-12, IL-23, iNOS and TNF. These findings demonstrate the dual capacity of Ly6Chi blood monocytes to differentiate into either regulatory MPs or inflammatory DCs in the colon, and that the balance of these immunologically antagonistic cell types is dictated by microenvironmental conditions. FACS sorted expression from normal controls
2011-12-21 | E-GEOD-27859 | biostudies-arrayexpress
Project description:Background: It is recognized that atherosclerosis can regresses at least in animal models. However, little is known about the mechanisms. We induced regression of advanced atherosclerosis in apolipoprotein E deficient (APOE/) mice and studied underlying mechanisms. Unexpectedly, our study led to the role of interleukin-7 (IL-7) in atherogenesis. Methods and Results: We treated APOE/ mice fed a high cholesterol diet for 30 weeks to induce advanced lesions with a helper-dependent adenoviral vector expressing human apoE3 (HDAd-gE3), and analyzed the regression of atherosclerosis after 41 weeks. Using microarray analysis, we identified IL-7 as one of most significantly affected genes by lowering cholesterol. To answer why IL-7 is downregulated by reduced cholesterol, we studied effects of IL-7 on endothelial cells (ECs). Our major findings were (1) long-term lowering cholesterol induced regression of advanced atherosclerosis. (2) Microarray analysis identified multiple signaling pathways affected by lowering cholesterol. (3) Correction for multiple testing revealed that IL-7 expression was downregulated, whereas gamma-sarcoglycan and α-actin were upregulated. (4) Oxidized LDL upregulated IL-7 expression in macrophages but not in aorta ECs or smooth muscle cells. (5) IL-7 increased the expression of cell adhesion molecules and chemokine in ECs and promoted monocyte adhesion to ECs. (6) Systemic elevation of IL-7 induced inflammatory response and recruited monocyte/macrophage to the lesions without increasing plasma cholesterol. Conclusion: Our finding suggest that IL-7 inflames endothelium and triggers the adhesion/recruitment of monocyte/macrophages to the atherosclerotic lesions and thus plays a direct role in development of atherosclerosis. Key Words: arteriosclerosis, gene therapy, hypercholesterolemia, interleukins, cell adhesion molecules Female APOE-/- mice (8 weeks of age) on a C57BL/6 background were purchased from Jackson Laboratory and were fed a diet containing 0.2% (w/w) cholesterol and 10% (v/w) coconut oil to induce atherosclerosis for 30 weeks. Mice were then divided into 3 groups, (n=15/group), treated with a tail vein injection of helper-dependent adenovirus expressing human apolipoprotein E3 (HDAd-gE3, 5 x 1012 viral particles/kg, n=11, vector), empty vector (HDAd-0, 5 x 1012 VP/kg, n=11, vector control) or phosphate buffered saline (PBS, vehicle) and sacrificed 10 days after. Three aortas extending sinus to arch were pooled for RNA extraction with an RNeasy kit (Qiagen). Sample ID 12031: E4: vector control (HDAd-0) 12043: E5: vector control 12046: V2: vector 12047: V3: vector 12048: V4: vector 12051: B1: vehicle (PBS) 12053: B3: vehicle 12054: B4: vehicle 12039: E3: vector control
2009-10-01 | E-GEOD-15914 | biostudies-arrayexpress
Project description:Background: It is recognized that atherosclerosis can regresses at least in animal models. However, little is known about the mechanisms. We induced regression of advanced atherosclerosis in apolipoprotein E deficient (APOE/) mice and studied underlying mechanisms. Unexpectedly, our study led to the role of interleukin-7 (IL-7) in atherogenesis. Methods and Results: We treated APOE/ mice fed a high cholesterol diet for 30 weeks to induce advanced lesions with a helper-dependent adenoviral vector expressing human apoE3 (HDAd-gE3), and analyzed the regression of atherosclerosis after 41 weeks. Using microarray analysis, we identified IL-7 as one of most significantly affected genes by lowering cholesterol. To answer why IL-7 is downregulated by reduced cholesterol, we studied effects of IL-7 on endothelial cells (ECs). Our major findings were (1) long-term lowering cholesterol induced regression of advanced atherosclerosis. (2) Microarray analysis identified multiple signaling pathways affected by lowering cholesterol. (3) Correction for multiple testing revealed that IL-7 expression was downregulated, whereas gamma-sarcoglycan and α-actin were upregulated. (4) Oxidized LDL upregulated IL-7 expression in macrophages but not in aorta ECs or smooth muscle cells. (5) IL-7 increased the expression of cell adhesion molecules and chemokine in ECs and promoted monocyte adhesion to ECs. (6) Systemic elevation of IL-7 induced inflammatory response and recruited monocyte/macrophage to the lesions without increasing plasma cholesterol. Conclusion: Our finding suggest that IL-7 inflames endothelium and triggers the adhesion/recruitment of monocyte/macrophages to the atherosclerotic lesions and thus plays a direct role in development of atherosclerosis. Key Words: arteriosclerosis, gene therapy, hypercholesterolemia, interleukins, cell adhesion molecules
2009-10-01 | GSE15914 | GEO