Related Experiment Video
Updated: Feb 22, 2026
Isolation of Adipose Tissue Immune Cells
Published on: May 22, 2013
Lipoprotein Lipase Maintains Microglial Innate Immunity in Obesity
Yuanqing Gao1, Andrés Vidal-Itriago1, Martin J Kalsbeek1
1Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, the Netherlands.
Abstract:
Consumption of a hypercaloric diet upregulates microglial innate immune reactivity along with a higher expression of lipoprotein lipase (Lpl) within the reactive microglia in the mouse brain. Here, we show that knockdown of the Lpl gene specifically in microglia resulted in deficient microglial uptake of lipid, mitochondrial fuel utilization shifting to glutamine, and significantly decreased immune reactivity. Mice with knockdown of the Lpl gene in microglia gained more body weight than control mice on a high-carbohydrate high-fat (HCHF) diet. In these mice, microglial reactivity was significantly decreased in the mediobasal hypothalamus, accompanied by downregulation of phagocytic capacity and increased mitochondrial dysmorphologies. Furthermore, HCHF-diet-induced POMC neuronal loss was accelerated. These results show that LPL-governed microglial immunometabolism is essential to maintain microglial function upon exposure to an HCHF diet. In a hypercaloric environment, lack of such an adaptive immunometabolic response has detrimental effects on CNS regulation of energy metabolism.
Insights
Lipoprotein lipase (LPL) in microglia is crucial for managing brain immune responses and energy metabolism during high-fat diets. Its deficiency impairs lipid uptake, alters metabolism, and exacerbates diet-induced brain changes.
Area of Science:
- Neuroimmunology
- Metabolic Neuroscience
- Cellular Metabolism
Background:
- Hypercaloric diets increase microglial immune reactivity and lipoprotein lipase (LPL) expression in the brain.
- Microglial LPL's role in regulating brain metabolism and immune responses under obesogenic conditions is unclear.
Purpose of the Study:
- To investigate the function of microglial lipoprotein lipase (LPL) in mediating brain responses to a high-carbohydrate, high-fat (HCHF) diet.
- To determine the impact of LPL knockdown in microglia on energy metabolism, immune reactivity, and neuronal health.
Main Methods:
- Utilized a mouse model with targeted knockdown of the Lpl gene specifically in microglia.
- Administered a high-carbohydrate, high-fat (HCHF) diet to assess metabolic and neurological changes.
- Analyzed microglial lipid uptake, mitochondrial function, immune reactivity, and POMC neuronal survival.
Main Results:
- Microglial LPL knockdown impaired lipid uptake and shifted mitochondrial metabolism towards glutamine utilization.
- Mice with microglial LPL knockdown exhibited decreased microglial immune reactivity and phagocytic capacity.
- These mice showed increased body weight gain, hypothalamic inflammation, mitochondrial dysfunction, and accelerated POMC neuronal loss on the HCHF diet.
Conclusions:
- Microglial LPL-governed immunometabolism is essential for adapting to HCHF diets and maintaining brain functions.
- Disruption of this adaptive response negatively impacts central nervous system regulation of energy metabolism and neuronal integrity.
