CD36 as a Context-Dependent Regulator of Metabolic Switching in Acute and Chronic Hypoxia.

CD36 is a multifunctional scavenger receptor involved in long-chain fatty acid (LCFA) uptake, binding of oxidized lipids, and interactions with extracellular matrix proteins such as thrombospondin-1. Through association with Src family kinases, integrins, and adaptor proteins, it also modulates signaling, migration, inflammation, angiogenesis, and phagocytosis. Hypoxia, a common feature of solid tumors, inflamed tissues, and ischemic organs, remodels CD36 expression, localization, and function through hypoxia-inducible factor (HIF) signaling and stress-activated kinases. These effects change cellular metabolism, intercellular lipid trafficking, and cell behavior (migration, phagocytosis, angiogenesis, immune phenotype) in a manner that is highly dependent on tissue type, duration of hypoxia, and metabolic context, with important implications for disease progression. In acute hypoxia, CD36 regulation often contributes to rapid metabolic adaptation, whereas in chronic hypoxia, it may promote sustained lipid accumulation, inflammation, maladaptive remodeling, or tumor progression. In this review, we aim to highlight the regulation and function of CD36 in hypoxia in different tissues, conditions, and metabolic states, emphasizing the distinct roles of CD36 in acute versus chronic hypoxia and its potential therapeutic implications. For example, hypoxia typically downregulates CD36 in ischemic cardiomyocytes to limit lipotoxic fatty acid influx, whereas in hepatocytes, adipocytes, and tumor-associated macrophages, it upregulates CD36-mediated lipid uptake to sustain steatotic, inflammatory, or protumorigenic metabolism, illustrating the tissue-specific nature of this regulation.