Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA350005 | ENA |
REPOSITORIES: ENA
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Project description:Professional phagocytes (such as macrophages) and non-professional phagocytes (such as epithelial cells) clear billions of apoptotic cells and particles on a daily basis. Since these phagocytes reside in proximity in most tissues, whether cross-communication exists between them during cell clearance, and how this might impact inflammation are not known. Here, we show that macrophages, via the release of a soluble growth factor and microvesicles, redirect the type of particles engulfed by non-professional phagocytes and influence their inflammatory response. During apoptotic cell engulfment or in response to inflammation-associated cytokines, macrophages released insulin-like growth factor 1 (IGF-1). The binding of IGF-1 to its receptor on non-professional phagocytes redirected their phagocytosis, such that uptake of larger apoptotic cells was dampened while engulfment of microvesicles was enhanced. Macrophages were refractory to this IGF-1 mediated engulfment modulation. Macrophages also released microvesicles, whose uptake by epithelial cells, enhanced by IGF-1, led to decreased inflammatory responses by epithelial cells. Consistent with these observations, deletion of IGF-1 receptor in airway epithelial cells led to exacerbated lung inflammation after allergen exposure. These genetic and functional studies reveal a novel IGF-1 and microvesicle-dependent communication between macrophages and epithelial cells that can critically influence the magnitude of tissue inflammation in vivo.
2016-11-01 | GSE89049 | GEO
Project description:Recognition and removal of apoptotic cells by professional phagocytes, including dendritic cells and macrophages, preserve self-tolerance and prevent chronic inflammation and autoimmune pathologies. However the diverse array of phagocytes residing within different tissues combined with the necessarily prompt nature of apoptotic cell clearance has made it difficult to study this process in situ. Thus, the full spectrum of functions executed by tissue resident phagocytes in response to homeostatic apoptosis remains unclear. We used microarrays to characterize the transcriptome within murine intestinal dendritic cells and macrophages both before and after in situ phagocytosis of apoptotic intestinal epithelial cells.
2016-11-10 | GSE85682 | GEO
Project description:On a daily basis, we turnover billions of apoptotic cells that are removed by professional and non-professional phagocytes1-10. While characterizing the transcriptional program of phagocytes, we discovered a novel solute carrier family (SLC) gene signature (33 SLC members) that is specifically modified during engulfment of apoptotic cells (efferocytosis) but not during antibody-mediated phagocytosis. When we assessed the functional relevance of these SLCs, we noted robust induction of an aerobic glycolysis program in engulfing phagocytes, initiated by SLC2A1-mediated glucose uptake, and suppression of oxidative phosphorylation program. Interestingly, the different steps of phagocytosis10,11, i.e. smell (‘find-me’ signals / sensing factors released by apoptotic cells), taste (phagocyte- apoptotic cell contact), and ingestion (corpse internalization), activated different molecules to promote this glycolytic process. Further, lactate, a natural by-product of aerobic glycolysis12,13, was released from engulfing phagocytes via SLC16A1, an SLC member activated after corpse uptake. While glycolysis within phagocytes contributed to actin polymerization and the continued uptake of corpses, the lactate released via SLC16A1 influenced the establishment of an anti-inflammatory environment. Collectively, these data reveal a novel SLC program activated during efferocytosis, identify a previously unknown reliance on aerobic glycolysis during apoptotic cell uptake, and that glycolytic byproducts of efferocytosis can also influence other cells in the microenvironment.
2018-11-30 | GSE119273 | GEO
Project description:Analysis of ex vivo isolated lymphatic endothelial cells from the dermis of patients to define type 2 diabetes-induced changes. Results preveal aberrant dermal lymphangiogenesis and provide insight into its role in the pathogenesis of persistent skin inflammation in type 2 diabetes. The ex vivo dLEC transcriptome reveals a dramatic influence of the T2D environment on multiple molecular and cellular processes, mirroring the phenotypic changes seen in T2D affected skin. The positively and negatively correlated dLEC transcripts directly cohere to prolonged inflammatory periods and reduced infectious resistance of patients´ skin. Further, lymphatic vessels might be involved in tissue remodeling processes during T2D induced skin alterations associated with impaired wound healing and altered dermal architecture. Hence, dermal lymphatic vessels might be directly associated with T2D disease promotion. Global gene expression profile of normal dermal lymphatic endothelial cells (ndLECs) compared to dermal lymphatic endothelial cells derived from type 2 diabetic patients (dLECs).Quadruplicate biological samples were analyzed from human lymphatic endothelial cells (4 x diabetic; 4 x non-diabetic). subsets: 1 disease state set (dLECs), 1 control set (ndLECs)
2012-06-01 | E-GEOD-38396 | biostudies-arrayexpress
Project description:Analysis of ex vivo isolated lymphatic endothelial cells from the dermis of patients to define type 2 diabetes-induced changes. Results preveal aberrant dermal lymphangiogenesis and provide insight into its role in the pathogenesis of persistent skin inflammation in type 2 diabetes. The ex vivo dLEC transcriptome reveals a dramatic influence of the T2D environment on multiple molecular and cellular processes, mirroring the phenotypic changes seen in T2D affected skin. The positively and negatively correlated dLEC transcripts directly cohere to prolonged inflammatory periods and reduced infectious resistance of patients´ skin. Further, lymphatic vessels might be involved in tissue remodeling processes during T2D induced skin alterations associated with impaired wound healing and altered dermal architecture. Hence, dermal lymphatic vessels might be directly associated with T2D disease promotion.
2012-06-02 | GSE38396 | GEO
Project description:Macrophages and dendritic cells have long been appreciated for their ability to migrate to and engulf dying cells and debris, including some of the billions of cells that are naturally eliminated from our body daily. However, a substantial amount of these dying cells are cleared by local tissue cells, so-called ‘non-professional phagocytes’, critical to preserve organismal fitness. How non-professional phagocytes are able to sense and digest nearby apoptotic corpses while still performing their normal tissue functions is unclear. Here, we explore the molecular mechanisms underlying this balancing act. Exploiting the cyclical bouts of tissue regeneration and degeneration during the hair cycle, we show that stem cells can transiently become non-professional phagocytes when confronted with dying cells. Adoption of this phagocytic state requires not only local lipids produced by apoptotic corpses, which are necessary for RXRα activation, but also tissue-specific retinoids able to activate RARg. The dual factor dependency enables tight regulation of the genes requisite to activate phagocytic apoptotic clearance. The tunable phagocytic program we describe here offers an attractive mechanism to offset phagocytic duties against the primary stem cell function of replenishing differentiated cells to preserve tissue integrity during homeostasis. Our findings have broad implications for other non-motile stem or progenitor cells which experience cell death in an immune-privileged niche.
2023-08-07 | GSE230523 | GEO
Project description:Phagocytosis is an essential process for the microbicidal function of professional phagocytes, in which phagosome maturation plays a critical role. Macrophage activation by interferons (IFN) increases their microbicidal activity, but delays phagosomal maturation. Here, we investigated the role of ubiquitylation in phagosome functions. We show that phagosomal proteins are ubiquitylated and that phagosomes contain diverse ubiquitin chain types, including atypical ubiquitin chains. IFN-γ activation of macrophages substantially enhanced phagosomal ubiquitylation of both innate immune response proteins and vesicle trafficking proteins. We identified the E3 ubiquitin ligase RNF115, which is enriched on phagosomes of IFN-γ activated macrophages, as an important regulator of phagosomal maturation. Loss of RNF115 protein or ubiquitin ligase activity facilitated enhanced phagosomal maturation, and increased cytokine responses to Staphylococcus aureus. Our data suggests that both innate immune signalling and phagolysosomal trafficking are controlled through ubiquitylation. In conclusion, we identify RNF115 and ubiquitylation as important regulators of innate immune signalling from the phagosome during bacterial infections.
2022-07-20 | PXD026843 | Pride
Project description:During lung infection Mycobacterium tuberculosis (Mtb) resides in macrophages and subverts the bactericidal mechanisms of these professional phagocytes. In this work we have analyzed by DNA microarray technique the global transcription profile of Mtb infecting primary human macrophages in order to identify putative bacterial pathogenic factors that can be relevant for the intracellular survival of Mtb. Keywords: time course
2007-12-18 | GSE6209 | GEO
Project description: Not available
| S-EPMC2531291 | biostudies-literature
Project description:RNA extracted at 240min. Samples are rRNA depleted. Expression measurement of Homo sapiens genes.
2019-07-31 | GSE114179 | GEO