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Learn MoreHDL infusion reduces atherosclerosis in animal models and is being evaluated as a treatment in humans. While some studies have shown anti-inflammatory effects of HDL in macrophages, others have reported pro-inflammatory effects and there is no consensus on underlying mechanisms. Transcriptional profiling reveals that HDL-mediated cholesterol efflux leads to both pro- and anti-inflammatory effects in LPS-stimulated macrophages. While early anti-inflammatory effects reflect reduced TLR4 levels, late anti-inflammatory effects are due to reduced interferon receptor signaling. Pro-inflammatory effects occur late and are ER stress responses mediated by IRE1a/ASK1/p38 MAPK signaling under conditions of marked cholesterol depletion. rHDL infusions in hypercholesterolemic atherosclerotic mice produced moderate anti-inflammatory effects in lesional macrophages without pro-inflammatory gene expression changes suggesting a beneficial therapeutic effect of HDL in vivo. SOURCE: David,G,Thomas Columbia University
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