What this means
BACKGROUND AND Lifelong exposure to elevated low-density lipoprotein cholesterol in familial hypercholesterolaemia (FH) patients not only increases the risk of atherosclerotic cardiovascular disease, but also affects other organs beyond the cardiovascular system. In a large FH cohort, this study investigated the effects of hypercholesterolaemia on the thymic output and explored whether lipid-lowering therapy can reverse these effects.
A plain-English summary is on its way. Until then, this is the start of the authors' own summary.
- Who it was tested in
- Not stated
- Kind of research
- A study
The science
- Original title
- Familial hypercholesterolaemia and thymic ageing in a Chinese cohort.
- Authors
- Li F, Zhang J, Deng J et al.
- Journal
- European heart journal
- Published
- Oct 20, 2026
- Study type
- Study
- PMID
- 42900678 ↗
Abstract
Background
Lifelong exposure to elevated low-density lipoprotein cholesterol in familial hypercholesterolaemia (FH) patients not only increases the risk of atherosclerotic cardiovascular disease, but also affects other organs beyond the cardiovascular system. In a large FH cohort, this study investigated the effects of hypercholesterolaemia on the thymic output and explored whether lipid-lowering therapy can reverse these effects.
What they did
According to the Dutch Lipid Clinic Network criteria, 562 heterozygous FH patients (236 treatment-naïve, 326 on lipid-lowering therapy) and 295 age-matched healthy controls (HCs) were enrolled. Thymic output was measured by circulating CD4+ recent thymic emigrants (RTEs) with flow cytometry, and T-cell receptor excision circles in sorted naïve CD4+ and CD8+ T cells. Repertoire diversity and clonal expansion were evaluated by T-cell receptor beta sequencing.
What they found
Compared with HCs, treatment-naïve FH patients displayed a significantly reduced percentage of CD4+ RTE among naïve CD4+ T cells, particularly in those aged 18-30 years or carrying highly pathogenic LDLR variants. T-cell receptor excision circle analysis supported reduced thymic output in both CD4+ and CD8+ naïve T cells. Quantified thymic ageing further showed that FH patients reached the median CD4+ RTE percentage of HCs ∼6 years earlier (males: 19.12 vs 25.51 years; females: 19.18 vs 25.58 years). Consistent with reduced thymic output, FH patients showed skewing towards high-frequency T-cell receptor beta clones. Statin-treated FH patients, particularly females, showed higher circulating CD4+ RTE levels than statin-naïve FH patients. Hypercholesterolaemia was associated with reduced thymic output, while statin-treated patients showed partially preserved circulating CD4+ RTE levels, supporting integrated metabolic and immunologic strategies for FH management.
The authors' abstract, grouped under plain headings from its own section labels.
Li F, Zhang J, Deng J et al. Familial hypercholesterolaemia and thymic ageing in a Chinese cohort. European heart journal. 2026. doi:10.1093/eurheartj/ehag810. PMID: 42900678. https://pubmed.ncbi.nlm.nih.gov/42900678/