Monocytes and macrophages have crucial and distinct roles in tissue homeostasis and immunity, but they also contribute to a broad spectrum of pathologies and are thus attractive therapeutic targets
Scientist in laboratory examinates samples and chemical fluids.
Florent Ginhoux & Steffen Jung
Monocytes and macrophages have crucial and distinct roles in tissue homeostasis and immunity, but they also contribute to a broad spectrum of pathologies and are thus attractive therapeutic targets. Potential intervention strategies that aim to manipulate these cells will require an in-depth understanding of their origins and the mechanisms that ensure their homeostasis. Recent evidence shows that monocytes do not substantially contribute to most tissue macrophage populations in the steady state or during certain types of inflammation. Rather, most tissue macrophage populations in mice are derived from embryonic precursors, are seeded before birth and can maintain themselves in adults by self-renewal. In this Review, we discuss the evidence that has dramatically changed our understanding of monocyte and macrophage development, and the maintenance of these cells in the steady state.
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