Circadian metabolism regulates the macrophage inflammatory response

Abstract

Macrophages are an integral part of the innate immune system and coordinate host defense to microbial infections, as well as shaping the remodeling response after tissue injury. Metabolism is now appreciated to be a powerful and pervasive regulator of the identity and function of macrophages. Upon exposure to microbial ligands, macrophage inflammatory activation and the associated induction of phagocytosis, inflammatory responses, and other host defense activities are supported by dynamic changes to cellular metabolism. Of note, metabolic activity is robustly regulated in a circadian fashion, with many metabolic processes displaying peak activity in one phase of the circadian cycle and trough activity in an antiphase manner. Here, we review recent findings suggesting that circadian metabolism influences macrophage activities and particularly the inflammatory response. First, we summarize macrophage activities known to display time-of-day–dependent variation and their mechanistic basis. Second, we review metabolic processes that have been shown to be rhythmically regulated in macrophages and discuss how such circadian metabolism affects or is likely to affect macrophage activities. Third, we discuss the concept of entrainment of the macrophage clock, and consider how loss of rhythmic regulation of macrophage activities may contribute to pathophysiological conditions like shift work, obesity, and aging. Finally, we propose that circadian metabolism can be used to understand the rationale and mechanistic basis of dynamic regulation of inflammatory responses during infection.

Keywords

macrophage metabolism / circadian metabolism / circadian rhythm / immunometabolism / circadian immunometabolism / macrophage inflammatory responses

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2022 The Author(s) 2022. Published by Oxford University Press on behalf of Higher Education Press.