miR-142 controls metabolic reprogramming that regulates dendritic cell activation.

Area of Science:

• Immunology
• Cellular Metabolism
• Molecular Biology

Background:

• Dendritic cells (DCs) are key immune regulators that undergo metabolic reprogramming.
• This metabolic shift, from oxidative phosphorylation (OXPHOS) to glycolysis, is essential for mounting effective immune responses.
• The precise mechanisms controlling this metabolic reprogramming in DCs remain largely unknown.

Purpose of the Study:

• To elucidate the role of microRNA-142 (miR-142) in DC metabolic reprogramming.
• To investigate how miR-142 influences the immunogenic and tolerogenic functions of DCs.
• To identify the molecular targets and pathways regulated by miR-142 in DCs.

Main Methods:

• Utilized loss- and gain-of-function experiments for miR-142 in DCs.
• Assessed DC metabolic profiles, including shifts between OXPHOS and glycolysis.
• Analyzed T cell activation in vitro and in vivo models of sepsis and alloimmunity.
• Investigated the regulation of fatty acid (FA) oxidation and carnitine palmitoyltransferase -1a (CPT1a).

Main Results:

• miR-142 is essential for the metabolic switch from OXPHOS to glycolysis in DCs.
• Absence of miR-142 leads to impaired glycolysis and reduced pro-inflammatory cytokine production.
• DCs lacking miR-142 exhibit diminished capacity to activate T cells in vitro and in vivo.
• miR-142 directly targets CPT1a, a key regulator of FA oxidation, thereby controlling the metabolic shift.

Conclusions:

• miR-142 is a critical regulator of DC metabolic reprogramming, driving the shift towards glycolysis.
• This miR-142-mediated metabolic reprogramming is vital for promoting DC immunogenicity and T cell activation.
• Targeting miR-142 offers a potential strategy to modulate DC function in immune and disease contexts.