Macrophages on demand: How tissue trauma shapes their role

Macrophages, renowned for their plasticity, are central to both the immune response and tissue repair following physical trauma. This review delineates how tissue trauma dynamically modulates macrophage function across organs, highlighting their dichotomous roles in promoting inflammation versus regeneration. After injury, macrophages shift along a continuum from pro-inflammatory to pro-regenerative states, influenced by local and systemic cues, injury type, and microenvironmental factors, including damage-associated molecular patterns, and cytokines leading to pronounced organ-specific differences. The temporal and spatial dynamics of macrophage recruitment - from resident pools or via monocyte influx - dictate not only healing outcomes but also the risk of organ dysfunction and chronic inflammation. Emerging immunomodulatory strategies, encompassing stem cell therapies, pharmacological phenotype modulation, and microbiome-targeted approaches, underscore the clinical potential of precise macrophage-targeted interventions. Understanding macrophage adaptability post-trauma is crucial for devising organ- and context-specific therapies to optimize tissue repair and minimize adverse outcomes.