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MAIT Cells Promote Cholesterol Excretion Pathways Mitigating Atherosclerosis.

Hua Wang1, Pukar Kc1, Kaidi Zhang1

  • 1Sorbonne Université, National Institute of Health and Medical Research (INSERM) U1166, Paris, France (H.W., P.K.C., K.Z., C.M., S.G., C.N., M.G., P.L.).

Circulation Research
|March 26, 2025
PubMed
Summary
This summary is machine-generated.

Mucosal-associated invariant T (MAIT) cells protect against atherosclerosis by enhancing cholesterol excretion. This study reveals a novel immune mechanism for regulating cholesterol homeostasis and preventing cardiovascular disease.

Keywords:
atherosclerosischolesterol, dietarycoronary artery diseasehypercholesterolemiamucosal-associated invariant T cells

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Area of Science:

  • Immunology
  • Cardiovascular Research
  • Metabolic Disease

Background:

  • Reduced circulating mucosal-associated invariant T (MAIT) cells are observed in coronary artery disease.
  • The exact role and mechanisms of MAIT cells in atherosclerosis remain unclear.
  • Immune homeostasis is critical in atherosclerosis development.

Purpose of the Study:

  • To investigate the impact of MAIT cells on atherosclerosis.
  • To elucidate the mechanisms by which MAIT cells influence cholesterol metabolism.

Main Methods:

  • Utilized Vα19+/- Ldlr-/- (high MAIT cell frequency) and MR1-/- Ldlr-/- (MAIT cell deficient) mice on a high-cholesterol diet.
  • Analyzed circulating MAIT cell frequency and cholesterol levels in hypercholesterolemia patients.
  • Assessed jejunal gene expression related to cholesterol transport and Liver X receptor signaling.

Main Results:

  • Increased MAIT cells reduced very-low-density lipoprotein cholesterol (VLDL-C) via enhanced intestinal cholesterol excretion in mice.
  • MAIT cell deficiency led to higher total cholesterol and exacerbated atherosclerotic lesions.
  • MAIT cell frequency negatively correlated with VLDL-C and positively with HDL-C in patients.

Conclusions:

  • MAIT cells mediate VLDL-C clearance through intestinal cholesterol excretion, a novel mechanism.
  • Immunity plays a significant role in cholesterol homeostasis.
  • Targeting intestinal immunity offers a potential strategy for cholesterol-lowering and preventing atherosclerotic cardiovascular disease.