CD8(+)CD25(+) T cells reduce atherosclerosis in apoE(-/-) mice

Area of Science:

• Immunology
• Cardiovascular Research

Background:

• CD8(+) T cells are implicated in atherosclerosis.
• The specific role of CD8(+)CD25(+) T cells in this disease is unknown.
• CD8(+)CD25(+) T cells are known to suppress immune signaling.

Purpose of the Study:

• To investigate the phenotype and function of CD8(+)CD25(+) T cells in experimental atherosclerosis.
• To determine the atheroprotective potential of CD8(+)CD25(+) T cells.

Main Methods:

• Atherosclerosis was induced in apoE(-/-) mice on a hypercholesterolemic diet.
• Flow cytometry and CFSE-based proliferation assays were used for characterization.
• Adoptive transfer experiments were performed.

Main Results:

• CD8(+)CD25(+) T cells were identified within atherosclerotic plaques.
• These cells exhibited suppressive functions.
• Depletion of CD8(+)CD25(+) T cells enhanced CD8(+)CD25(-) T cell cytolytic activity.
• Adoptive transfer reduced CD4(+) T cell proliferation and atherosclerosis.

Conclusions:

• CD8(+)CD25(+) T cells play an athero-protective role in experimental atherosclerosis.
• This T cell subset may represent a novel therapeutic target for atherosclerosis.