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Specific autoantigens in experimental autoimmunity-associated atherosclerosis.

Aksam J Merched1, Danièle Daret2, Lan Li2

  • 1Department of Pharmaceutical Sciences, and INSERM U1053, University of Bordeaux, Bordeaux, France Department of Cell Biology, Baylor College of Medicine, Houston, Texas, USA aksam.merched@u-bordeaux.fr.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
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Autoimmunity accelerates atherosclerosis by targeting vascular proteins. Researchers identified specific autoantigens in a mouse model, revealing potential diagnostic and therapeutic targets for related cardiovascular diseases.

Keywords:
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Area of Science:

  • Immunology
  • Cardiovascular Research
  • Atherosclerosis

Background:

  • Autoimmune diseases are linked to increased cardiovascular morbidity, suggesting autoimmunity's role in atherosclerosis.
  • Understanding the mechanisms of accelerated atherosclerosis in autoimmunity is crucial for developing targeted interventions.

Purpose of the Study:

  • To investigate the mechanisms behind autoimmunity-associated accelerated atherosclerosis.
  • To identify specific vascular autoantigens targeted by autoimmunity in this context.

Main Methods:

  • A mouse model was created by bone marrow transplantation from FcγRIIB knockout mice into LDL receptor knockout mice.
  • Cellular and molecular mechanisms of atherogenesis were characterized.
  • Serologic proteomic studies were employed to identify aortic autoantigens.

Main Results:

  • Autoimmune mice exhibited significantly more aggressive atherosclerosis compared to controls.
  • FcγRIIB(-/-) macrophages displayed reduced phagocytic capabilities (46-72%).
  • Proteomic analysis identified autoantibodies targeting 25 atherosclerotic lesion proteins, including adhesion, cytoskeleton, and extracellular matrix components.

Conclusions:

  • Autoimmunity drives accelerated atherosclerosis through specific autoantigens.
  • These identified autoantigens and the vascular autoimmunosome represent potential targets for diagnostics and immunotherapeutics in autoimmunity-associated cardiovascular diseases.