Macrophage Dynamics in Wound Healing Processes
Summary
Macrophages orchestrate wound healing through dynamic plasticity, mediating inflammation, debris clearance and tissue regeneration. In acute wounds they adopt a pro-inflammatory profile to remove pathogens and apoptotic cells, then transition to anti-inflammatory states that promote matrix deposition, angiogenesis and re-epithelialisation. This continuum is controlled by local cytokines, metabolic cues and epigenetic networks. In chronic or diabetic wounds the M1-to-M2 shift is delayed, causing prolonged inflammation and impaired efferocytosis. Advances have identified microRNA programmes and epigenetic modifications in haematopoietic stem cells that pre-determine macrophage fate. Live-imaging studies have revealed macrophages’ real-time interactions with endothelium, driving vessel sprouting and regression. These insights underpin novel therapies—from tailored biomaterials and exosome-based treatments to targeted molecular interventions—aimed at recalibrating macrophage dynamics for improved healing outcomes.
Research from Nature Portfolio
Recent foundational work has uncovered an epigenetic mechanism by which a metabolic disorder shapes macrophage behaviour. Dysregulated oxidant stress in haematopoietic stem cells elevates Dnmt1, causing hypermethylation of key transcription factors and skewing differentiation towards pro-inflammatory macrophages while reducing overall macrophage numbers in wounds. This HSC-autonomous programming not only impairs efferocytosis but also delays the crucial M1-to-M2 shift, thus prolonging the inflammatory phase. These findings highlight an intrinsic link between systemic metabolic states and local immune cell function, offering new targets for epigenetic reprogramming to restore effective wound repair.
Macrophage Dynamics in Wound Healing Processes publication trend
The graph below shows the total number of articles in macrophage dynamics in wound healing processes across all publications each year (not limited to Nature Index journals).
Technical terms
Polarization: The process by which macrophages adopt distinct functional states (e.g. pro-inflammatory M1 and anti-inflammatory M2) in response to stimuli.
Efferocytosis: The clearance of apoptotic cells by macrophages, a key trigger for resolution of inflammation and tissue repair.
Epigenetic reprogramming: Heritable modifications to DNA or chromatin (such as methylation by Dnmt1) that alter gene expression without changing the DNA sequence.
Exosomes: Small extracellular vesicles released by cells that transport proteins, lipids and nucleic acids, mediating intercellular communication.
MicroRNA: Short non-coding RNA molecules that regulate gene expression post-transcriptionally, influencing macrophage activation and function.
References
- Diabetes impairs wound healing by Dnmt1-dependent dysregulation of hematopoietic stem cells differentiation towards macrophages. Nature Communications (2018).
- Lean adipose tissue macrophage derived exosome confers immunoregulation to improve wound healing in diabetes. Journal of Nanobiotechnology (2023).
- Macrophage plasticity: signaling pathways, tissue repair, and regeneration. MedComm (2024).
- Live imaging of wound angiogenesis reveals macrophage orchestrated vessel sprouting and regression. The EMBO Journal (2018).
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