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Anti-Malondialdehyde Low-Density Lipoprotein Antibodies and Valvular Calcification: A Substudy of the SCOT-HEART

Adam Hartley1, Michelle C Williams2, Amit Kaura1

  • 1National Heart and Lung Institute Imperial College London UK.

Journal of the American Heart Association
|November 3, 2025
PubMed

Insights

Natural antibodies targeting malondialdehyde-modified low-density lipoprotein (MDA-LDL) were linked to reduced prevalence of aortic and mitral valve calcification. These findings suggest novel biomarkers for screening patients with valvular disease.

Area of Science:

  • Cardiology
  • Immunology
  • Biomarkers

Background:

  • Coronary computed tomography (CT) is vital for assessing valvular disease, particularly aortic and mitral valve conditions.
  • Natural antibodies against malondialdehyde-modified low-density lipoprotein (MDA-LDL) are associated with reduced atherosclerosis and cardiovascular events.
  • This study investigates the link between aortic and mitral valve calcification and anti-MDA-LDL antibodies (IgG and IgM).

Purpose of the Study:

  • To explore the association between aortic and mitral valve calcification and natural antibodies against MDA-LDL.
  • To determine if IgG and IgM anti-MDA-LDL antibody levels correlate with the prevalence of valve calcification.

Main Methods:

  • A substudy of the SCOT-HEART trial was conducted.
  • Blood biomarkers, including anti-MDA-LDL antibodies, were measured using enzyme-linked immunosorbent assays.
  • Data were analyzed in tertiles, adjusted for the ASSIGN cardiovascular risk score.

Main Results:

  • In 830 patients, the highest tertile of IgM anti-MDA-LDL was associated with lower prevalence of aortic valve calcification (OR 0.59) and mitral valve calcification (OR 0.26).
  • The highest tertile of IgG anti-MDA-LDL was linked to a lower prevalence of mitral valve calcification (OR 0.36) but not aortic calcification.
  • These associations were observed in patients with a high burden of cardiovascular risk factors.

Conclusions:

  • Anti-MDA-LDL antibody levels show an association with a reduced prevalence of both aortic and mitral valve calcification.
  • These novel biomarkers may aid in screening patients for valve calcification.
  • The findings offer insights into potential pathological relationships in valvular disease.
Abstract

Keywords:
anti‐oxidized LDL antibodiesatherosclerosiscoronary CT angiographyoxidized LDLvalvular calcification

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