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Updated: Feb 15, 2026

Author Spotlight: Development and Evaluation of a Cationic Nanoemulsion-Encapsulated Retinoic Acid System for Mucosal Vaccination
Published on: February 23, 2024
Retinoic Acid Enhances Apolipoprotein E Synthesis in Human Macrophages
Vera Clemens1, Francesca Regen1, Nathalie Le Bret1
1Department of Psychiatry, Section Clinical Neurobiology, Campus Benjamin Franklin, Charité, University Medicine Berlin, Germany.
Abstract:
Apolipoprotein E (ApoE) represents a pivotal target in Alzheimer's disease (AD) and is modulated through retinoic acid (RA), an endogenous neuroprotective and anti-inflammatory compound. A major source of ApoE are microglia, which are pathologically activated in AD. Activated microglia are known to block RA signaling. This suggests a vicious cycle between inflammation, RA signaling, and ApoE homeostasis in AD pathogenesis. To test this hypothesis, we investigated effects of RA and proinflammatory activation on ApoE synthesis in primary human macrophage-derived microglial-like cells. Our results indicate that proinflammatory activation attenuates ApoE synthesis, an effect blocked by RA.
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