Persistent accumulation of interferon-γ-producing CD8+CD56+ T cells in blood from patients with coronary artery disease

Area of Science:

• Immunology
• Cardiovascular Disease Research

Background:

• Emerging evidence suggests CD8(+) T cell alterations in coronary artery disease (CAD).
• CD8(+)CD56(+) T cells represent a distinct T cell subset with potential roles in immune responses.

Purpose of the Study:

• To investigate differences in CD8(+)CD56(+) T cell distribution and phenotype in patients with varying clinical manifestations of CAD.
• To compare these cells between acute coronary syndrome (ACS), stable angina (SA), and control groups.

Main Methods:

• Flow cytometry was used to analyze CD8(+)CD56(+) T cells in blood samples from ACS (n=30), SA (n=34), and control (n=36) patients.
• Assessment included surface marker expression, apoptosis, and intracellular cytokine production (IFN-γ, TNF).
• Samples were collected pre- and post-intervention (3 and 12 months).

Main Results:

• Proportions of CD8(+)CD56(+) T cells were significantly higher in ACS and SA patients compared to controls, persisting up to 12 months.
• These cells exhibited lower CD28 expression and reduced apoptosis compared to CD8(+)CD56(-) T cells.
• While both subsets produced IFN-γ and TNF, IFN-γ was more concentrated in CD8(+)CD56(+) T cells.

Conclusions:

• Persistent accumulation of CD8(+)CD56(+) T cells in CAD patients resembles immunological aging.
• These cells contribute to an expanded IFN-γ(+) pool, potentially promoting atherosclerosis.
• Understanding these T cell alterations may offer insights into CAD pathogenesis and progression.