Reprogram to heal: Macrophage phenotypes as living therapeutics

Macrophages represent a crucial cell type within the immune system, exhibiting significant adaptability that allows for the transformation into various phenotypes in response to their surrounding environment. This review investigates the characteristics of various macrophage phenotypes and their functional roles in disease pathogenesis and resolution. The M1 phenotype, recognized for its inflammatory attributes, plays a pivotal role in combating infections and tumors; however, it may also contribute to tissue injury, persistent inflammation, and the pathogenesis of autoimmune and inflammatory diseases. Conversely, the M2 phenotype is associated with anti-inflammatory activities and tissue repair processes. But this is not the end of the story and researches illustrated novel phenotypes that may provide new approaches and therapeutic opportunities. Recent progress in characterizing distinct macrophage phenotypes has enabled the development of innovative therapeutic strategies for chronic inflammatory conditions, autoimmune disorders, and cancers. This review underscores the critical role of macrophage polarization, illustrating how various stimuli can influence macrophage fate and modify their responses. Additionally, it explores the implications of macrophage plasticity on disease progression and treatment efficacy. A comprehensive understanding of these dynamics is essential for the advancement of targeted immunotherapies, which possess the potential to transform treatment strategies for a variety of medical conditions.