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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
Published on: January 31, 2025
601
Autophagy impairment is involved in midazolam-induced lipid droplet accumulation and consequent phagocytosis decrease
Xiao-Ling Zhu1, Hui-Wen Zhang1, Wen-Jing Peng1
1Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Key Laboratory of Anesthesiology and Perioperative Medicine of Anhui Higher Education Institutes, Anhui Medical University, China.
Biochemical and Biophysical Research Communications
|January 7, 2023
Summary
Midazolam, an anesthetic, increases lipid droplets and impairs microglial phagocytosis, potentially causing central nervous system (CNS) complications. Promoting autophagy may mitigate these adverse effects.
Area of Science:
- Neuroscience
- Cell Biology
- Anesthesiology
Background:
- Anesthetics are linked to postoperative central nervous system (CNS) complications like delirium and cognitive dysfunction.
- Microglia play a critical role in CNS health, but anesthetic effects on their energy metabolism and function remain unclear.
- Understanding how anesthetics impact microglial lipid metabolism and phagocytosis is key to developing new therapeutic strategies for CNS disorders.
Purpose of the Study:
- To investigate the effects of midazolam, a common anesthetic, on lipid droplet accumulation and phagocytosis in immortalized microglial BV2 cells.
- To explore the role of autophagy in mediating midazolam's impact on microglial function.
- To identify potential therapeutic targets for mitigating anesthetic-induced CNS side effects.
Main Methods:
- Assessed lipid droplets using flow cytometry and triglyceride quantification.
- Evaluated microglial phagocytosis by measuring latex bead uptake.
- Analyzed autophagy via western blot and microscopy.
- Investigated the role of phosphorylated TFEB (transcription factor EB) and rapamycin in modulating autophagy.
Main Results:
- Midazolam treatment led to increased lipid droplet accumulation and decreased phagocytic activity in BV2 cells.
- Inhibiting lipid droplet accumulation partially restored microglial phagocytosis.
- Midazolam disrupted autophagic degradation by increasing phosphorylated TFEB.
- Promoting autophagy reversed midazolam-induced lipid droplet accumulation and phagocytosis reduction.
Conclusions:
- Autophagy is a potential therapeutic target for reducing anesthetic-induced lipid droplet accumulation in microglia.
- Normal lipid droplet degradation is essential for maintaining microglial phagocytosis and preventing CNS side effects of anesthetics.
- Targeting autophagy may offer a novel approach to attenuate midazolam's adverse effects on the central nervous system.
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