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Generation of Monocyte-Derived Dendritic Cells with Differing Sialylated Phenotypes
Published on: October 20, 2023
Role of fatty-acid synthesis in dendritic cell generation and function
Adeel Rehman1, Keith C Hemmert, Atsuo Ochi
1Department of Surgery, S. Arthur Localio Laboratory, New York University School of Medicine, New York, NY 10016, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|March 29, 2013
Summary
Inhibiting fatty-acid synthesis impairs dendritic cell (DC) development but enhances their immune function by inducing endoplasmic reticulum stress. This finding has implications for designing DC vaccines for immunotherapy.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Dendritic cells (DCs) are crucial antigen-presenting cells (APCs) regulating immune responses.
- The specific role of fatty-acid synthesis in DC development and function remains largely unknown.
- Understanding these processes is vital for advancing immunotherapy strategies.
Purpose of the Study:
- To investigate the impact of inhibiting fatty-acid synthesis on dendritic cell development and function.
- To explore the underlying mechanisms, including endoplasmic reticulum (ER) stress, involved in these processes.
- To assess the potential of these findings for developing novel DC-based vaccines.
Main Methods:
- Utilized mouse models and human peripheral blood mononuclear cells (PBMCs) to study DC development.
- Employed blockade of fatty-acid synthesis and measured cellular apoptosis, protein expression (caspase-3, BCL-xL, cyclin B1), and cytokine production (IL-12, MCP-1).
- Assessed DC immunogenicity by measuring T cell activation, CTL responses, and NK cell activation, alongside ER stress markers and signaling pathways (MAPK, Akt).
Main Results:
- Blockade of fatty-acid synthesis significantly reduced DC development (dendropoiesis) in both mice and humans.
- Inhibition led to increased precursor cell apoptosis and altered expression of key regulatory proteins.
- DCs exhibited decreased expression of MHC class II and co-stimulatory molecules but enhanced pro-inflammatory cytokine production and T cell activation capacity.
- Fatty-acid synthesis inhibition induced ER stress, which was linked to enhanced DC immunogenicity, a effect mitigated by 4-phenylbutyrate.
Conclusions:
- Fatty-acid synthesis is essential for normal dendritic cell development.
- Inhibition of fatty-acid synthesis enhances DC immunogenicity, partly through ER stress induction.
- These findings provide critical insights into DC biology and offer potential avenues for improving DC vaccine design in immunotherapy.
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