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Adaptive Immune Responses in Human Atherosclerosis.

Silvia Lee1,2, Benjamin Bartlett1,3, Girish Dwivedi1,3,4

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This review explores how T-cells and B-cells influence atherosclerosis. Certain immune cells promote disease, while others protect against it, offering potential biomarkers for monitoring plaque progression.

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Area of Science:

  • Immunology
  • Cardiovascular Medicine
  • Pathology

Background:

  • Atherosclerosis is a chronic inflammatory condition driven by lipid deposition in arteries.
  • Immune cell involvement, particularly T-cells and B-cells, is critical in plaque development and progression.

Purpose of the Study:

  • To review the roles of T-cells and B-cells in human atherosclerotic plaques.
  • To evaluate the potential of circulating immune cells as biomarkers for atherosclerosis monitoring.

Main Methods:

  • Review of existing literature on immune cell populations within atherosclerotic plaques.
  • Analysis of studies investigating the function of specific T-cell subsets (Th1, CD4+CD28null, NKT, Th2, Treg) and B-cells.
  • Examination of research on antigen recognition by intraplaque T-cells.

Main Results:

  • Proatherogenic roles identified for intraplaque T helper type 1 (Th1) cells, CD4+CD28null T-cells, and natural killer T-cells.
  • Atheroprotective roles suggested for Th2 cells and regulatory T-cells (Treg).
  • Intraplaque T-cells are activated by endogenous antigens (e.g., HSP60, oxLDL) and potentially pathogen-derived antigens.

Conclusions:

  • Specific T-cell subsets play opposing roles in atherosclerosis, influencing disease progression.
  • Circulating immune cell profiling may offer a non-invasive method to monitor atherosclerosis.
  • Further research is needed to validate cellular biomarkers for identifying vulnerable atherosclerotic lesions and guiding interventions.