ABCB10 Loss Reduces CD4⁺ T Cell Activation and Memory Formation

Area of Science:

• Immunology
• Cellular Metabolism
• Mitochondrial Biology

Background:

• T cell activation requires metabolic shifts.
• The role of mitochondrial transporter ABCB10 in T cell immunity is largely unknown.
• ABCB10 is implicated in heme biosynthesis and metabolism.

Purpose of the Study:

• To investigate the function of ABCB10 in T cell development and activation.
• To determine the impact of ABCB10 loss on T cell responses to infection and transformation.
• To explore the mechanistic basis of ABCB10's role in T cell metabolism.

Main Methods:

• Analysis of primary mouse T cells (CD4+ and CD8+) with ABCB10 loss.
• In vitro T cell activation assays and cytokine profiling.
• In vivo viral infection models.
• CRISPR-mediated gene disruption in human Jurkat T cells.
• Metabolic assays, including assessment of aerobic glycolysis.

Main Results:

• ABCB10 is dispensable for T cell development but essential for specific cytokine production in activated CD4+ T cells.
• Loss of ABCB10 enhances CD8+ T cell expansion during viral infection but impairs CD4+ T cell responses.
• ABCB10 deficiency in CD4+ T cells leads to defective Ag-specific memory formation and recall responses.
• ABCB10 disruption in Jurkat T cells impairs the metabolic switch to aerobic glycolysis upon activation.
• Similar defects in cytokine expression were observed in mouse and human T cells lacking ABCB10.

Conclusions:

• ABCB10 plays a selective role in CD4+ T cell cytokine responses and memory formation.
• Targeting ABCB10 may offer a strategy to modulate aberrant T cell activation.
• ABCB10 is critical for metabolic adaptation of T cells during activation.