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Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [ATAC-seq 72h post-LPS]

ABSTRACT: Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis.

ORGANISM(S): Mus musculus

PROVIDER: GSE319365 | GEO | 2026/02/20

REPOSITORIES: GEO

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Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [RNA-seq]

Project description:Recent studies suggest that training of innate immune cells such as tissue-resident macrophages by repeated noxious stimuli can heighten host defense responses. However, it remains unclear whether trained immunity of tissue-resident macrophages also comprises enhanced injury resolution capacity to counterbalance the heightened inflammatory responses. Here, we studied lung-resident alveolar macrophages (AMs) pre-challenged with either the bacterial endotoxin or with Pseudomonas aeruginosa and observed that these trained AMs showed greater resilience to pathogen-induced cell death. Transcriptomic analysis, and functional assays showed greater capacity of trained AMs to efferocytosis of cellular- debris, and facilitate injury resolution. Single-cell high-dimensional mass-cytometry analysis and lineage tracing demonstrated that training induces an expansion of a MERTKhiMarcohiCD163+F4/80low lung-resident AMs subset with pro-resolving phenotypes. Training epigenetically reprogrammed AMs to express a higher level of the transcription factor KLF4 which in turn upregulates the efferocytosis receptor MERTK. Adoptive transfer of these trained AMs restricted inflammatory lung injury in recipient mice exposed to lethal Pseudomonas aeruginosa. Thus, our study has identified a unique subset of tissue-resident trained macrophages which prevent hyper-inflammation and restore tissue homeostasis following pathogen challenge.

2023-08-16 | GSE231218 | GEO

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [ATAC-seq]

2023-08-16 | GSE231217 | GEO

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis.

Project description:Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis.

| PRJNA962998 | ENA

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [2]

Project description:Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [2]

| PRJNA1423170 | ENA

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [RNA-seq]

Project description:Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [RNA-seq]

| PRJNA963000 | ENA

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [ATAC-seq]

Project description:Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [ATAC-seq]

| PRJNA963001 | ENA

Trained immunity of alveolar macrophages enhances injury resolution via KLF4-MERTK-mediated efferocytosis.

Project description:Recent studies suggest that training of innate immune cells such as tissue-resident macrophages by repeated noxious stimuli can heighten host defense responses. However, it remains unclear whether trained immunity of tissue-resident macrophages also enhances injury resolution to counterbalance the heightened inflammatory responses. Here, we studied lung-resident alveolar macrophages (AMs) prechallenged with either the bacterial endotoxin or with Pseudomonas aeruginosa and observed that these trained AMs showed greater resilience to pathogen-induced cell death. Transcriptomic analysis and functional assays showed greater capacity of trained AMs for efferocytosis of cellular debris and injury resolution. Single-cell high-dimensional mass cytometry analysis and lineage tracing demonstrated that training induces an expansion of a MERTKhiMarcohiCD163+F4/80low lung-resident AM subset with a proresolving phenotype. Reprogrammed AMs upregulated expression of the efferocytosis receptor MERTK mediated by the transcription factor KLF4. Adoptive transfer of these trained AMs restricted inflammatory lung injury in recipient mice exposed to lethal P. aeruginosa. Thus, our study has identified a subset of tissue-resident trained macrophages that prevent hyperinflammation and restore tissue homeostasis following repeated pathogen challenges.

| S-EPMC10450795 | biostudies-literature

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis.

Project description:This SuperSeries is composed of the SubSeries listed below.

2023-08-16 | GSE231219 | GEO

Trained immunity of alveolar macrophages promotes injury resolution by enhancing KLF4-MERTK-mediated efferocytosis [2]

Project description:This SuperSeries is composed of the SubSeries listed below.

2026-02-12 | GSE319375 | GEO

Macrophage MERTK mediates pressure overload-induced heart failure via type I interferon response

Project description:Macrophages play a critical role in the pathogenesis and progression of heart failure, wherein sustained cardiomyocyte apoptosis is a key feature. The MER proto-oncogene tyrosine kinase (MERTK) is a critical receptor that mediates the efferocytosis of apoptotic cells by macrophages. However, the role and mechanism of action of MERTK in pressure overload-induced heart failure remains unclear. Here, we demonstrate that MERTK expression was upregulated in cardiac tissue macrophages of mice with pressure overload-induced heart failure. Deletion of MERTK ameliorated transverse aortic constriction (TAC)- and Ang II-induced cardiac hypertrophy and heart failure. This protective effect was associated with reduced type I interferon signaling and was reversed by interferon receptor activation. Efferocytosis assays were performed to demonstrate that mitochondrial double-stranded RNA from apoptotic cardiomyocytes activated Toll-like receptor 3 in macrophages, promoting Interferon beta (IFNb) expression. In vitro experiment identified that IFNb sensitized cardiomyocytes to Ang II stimulation by augmenting the P53 pathway, suppressing Ang II-induced protective mitophagy and promoting cardiomyocyte apoptosis. In conclusion, macrophage MERTK receptor exacerbated post-TAC heart failure and cardiac hypertrophy by mediating the phagocytosis of apoptotic cardiomyocytes and promoting IFNb expression. This study provides novel insights into the role of macrophage MERTK-mediated efferocytosis and type I interferon response in the pathogenesis of heart failure. These findings highlight an unrecognized function of MERTK in pressure overload-induced cardiac remodeling and identify IFNb as a key downstream effector of MERTK in this pathological process

2025-09-01 | GSE306545 | GEO

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