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    Physiology and diseases of tissue-resident macrophages

    2023-08-23 17:00:38TomiLazarovetal
    四川生理科學(xué)雜志 2023年6期

    Tomi Lazarov,et al.

    Embryo-derived tissue-resident macrophages are the first representatives of the haematopoietic lineage to emerge in metazoans.In mammals,resident macrophages originate from early yolk sac progenitors and are specified into tissue-specific subsets during organogenesis-establishing stable spatial and functional relationships with specialized tissue cells-and persist in adults.Resident macrophages are an integral part of tissues together with specialized cells: for instance,microglia reside with neurons in brain,osteoclasts reside with osteoblasts in bone,and fat-associated macrophages reside with white adipocytes in adipose tissue.This ancillary cell type,which is developmentally and functionally distinct from haematopoietic stem cell and monocyte-derived macrophages,senses and integrates local and systemic information to provide specialized tissue cells with the growth factors,nutrient recycling and waste removal that are critical for tissue growth,homeostasis and repair.Resident macrophages contribute to organogenesis,promote tissue regeneration following damage and contribute to tissue metabolism and defence against infectious disease.A correlate is that genetic or environment-driven resident macrophage dysfunction is a cause of degenerative,metabolic and possibly inflammatory and tumoural diseases.In this Review,we aim to provide a conceptual outline of our current understanding of macrophage physiology and its importance in human diseases,which may inform and serve the design of future studies.

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