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Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus
Published on: September 19, 2013
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Myeloid apolipoprotein E controls dendritic cell antigen presentation and T cell activation
Fabrizia Bonacina1, David Coe2, Guosu Wang2
1Department of Pharmacological and Biomolecular Sciences (DisFeB), Università Degli Studi di Milano, Milan, 20133, Italy.
Nature Communications
|August 8, 2018
Summary
Apolipoprotein E (apoE) deficiency impairs cholesterol homeostasis in dendritic cells (DCs), boosting T-cell activation. Myeloid apoE regulates DC antigen presentation, offering potential for immune disease management.
Area of Science:
- Immunology
- Cell Biology
- Metabolic Diseases
Background:
- Cholesterol homeostasis is crucial for immune cell function.
- Apolipoprotein E (apoE) plays a role in lipid metabolism and has been implicated in immune responses.
Purpose of the Study:
- To investigate the role of apolipoprotein E (apoE) in dendritic cell (DC) function and immune regulation.
- To determine how apoE deficiency and its isoforms affect antigen presentation and T-cell activation.
Main Methods:
- Utilized wild-type (WT) and apoE knockout (KO) bone marrow chimera models.
- Assessed cholesterol accumulation in DC cell membranes.
- Measured MHC-II-dependent antigen presentation and CD4+ T-cell activation.
- Compared immune responses in humans with different apoE isoforms.
Main Results:
- ApoE deficiency causes cholesterol accumulation in DC membranes, enhancing antigen presentation and CD4+ T-cell activation.
- Hematopoietic apoE exhibits immunomodulatory functions independent of hypercholesterolemia.
- Individuals with apoE4 isoform show increased activated T cells due to enhanced DC antigen presentation, which is reversible with WT apoE3.
Conclusions:
- Myeloid-derived apoE is a key regulator of DC antigen presentation.
- Targeting apoE may offer therapeutic strategies for immune-related diseases.
- Understanding apoE's role in cholesterol homeostasis provides insights into immune cell modulation.
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