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Molecular control of activation and priming in macrophages
Christopher K Glass1, Gioacchino Natoli2
1Department of Cellular and Molecular Medicine and Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, California, USA.
Abstract:
In tissues, macrophages are exposed to metabolic, homeostatic and immunoregulatory signals of local or systemic origin that influence their basal functions and responses to danger signals. Signal-transduction pathways regulated by extracellular signals are coupled to distinct sets of broadly expressed stimulus-regulated transcription factors whose ability to elicit gene-expression changes is influenced by the accessibility of their binding sites in the macrophage genome. In turn, accessibility of macrophage-specific transcriptional regulatory elements (enhancers and promoters) is specified by transcription factors that determine the macrophage lineage or impose their tissue-specific properties. Here we review recent findings that advance the understanding of mechanisms underlying priming and signal-dependent activation of macrophages and discuss the effect of genetic variation on these processes.
Insights
Macrophages respond to tissue signals via transcription factors that control gene expression. Understanding how genetic variations affect these processes is crucial for macrophage biology and immune responses.
Area of Science:
- Immunology
- Cell Biology
- Genomics
Background:
- Macrophages are key immune cells influenced by diverse tissue signals.
- Their functions and responses are modulated by extracellular signals affecting transcription factors.
- Gene expression in macrophages is regulated by the accessibility of genomic binding sites.
Purpose of the Study:
- To review recent findings on macrophage priming and signal-dependent activation.
- To discuss the role of transcription factors in macrophage gene regulation.
- To explore the impact of genetic variation on macrophage signaling pathways.
Main Methods:
- Literature review of recent research findings.
- Analysis of signal-transduction pathways in macrophages.
- Examination of transcription factor binding site accessibility.
- Discussion of genetic variation's influence on macrophage processes.
Main Results:
- Extracellular signals activate specific transcription factors in macrophages.
- Accessibility of DNA binding sites is critical for stimulus-induced gene expression.
- Transcription factors define macrophage lineage and tissue-specific functions.
- Genetic variations can alter macrophage responses to signals.
Conclusions:
- Macrophage activation is a complex process involving signal-transduction and transcription factor dynamics.
- Genomic accessibility and genetic variation play significant roles in modulating macrophage functions.
- Further research into these mechanisms can inform therapeutic strategies for immune-related diseases.
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