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Phosphorylcholine-targeting immunization reduces atherosclerosis.

Giuseppina Caligiuri¹, Jamila Khallou-Laschet, Marta Vandaele

¹Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris 6, Paris, France. giuseppina.caligiuri@umrs681.jussieu.fr

Journal of the American College of Cardiology

|August 7, 2007

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Phosphorylcholine (PC) immunization significantly reduced experimental atherosclerosis by over 40% in mice. This immune response also decreased foam cell formation, suggesting PC immunization is atheroprotective.

Area of Science:

Immunology
Cardiovascular Research
Atherosclerosis Research

Background:

Immunization against oxidized lipoprotein (oxLDL) or Streptococcus pneumoconiae has shown to reduce atherosclerosis.
Phosphorylcholine (PC) is a key epitope recognized by antibodies targeting both pneumococcus and oxLDL.
PC-specific antibodies are hypothesized to play a significant role in atherogenesis.

Purpose of the Study:

To evaluate the impact of phosphorylcholine (PC) immunization on experimental atherosclerosis.
To investigate the role of PC-specific antibodies in the development of atherosclerosis.

Main Methods:

Apolipoprotein E knockout mice were immunized with PC over a 4-month period.
Serum antibody titers (anti-PC, anti-oxLDL), B cell populations, and atherosclerotic lesion characteristics were analyzed.

Related Experiment Videos

In vitro assays assessed the effect of PC-immune serum on macrophage foam cell formation.

Main Results:

PC immunization led to a 3-fold increase in anti-PC and anti-oxLDL antibody titers.
Atherosclerotic lesions in the aortic root were reduced by over 40% in PC-immunized mice.
PC-immune serum inhibited oxLDL-induced foam cell formation in macrophages in vitro.

Conclusions:

Phosphorylcholine immunization elicits a specific humoral immune response.
This response demonstrates atheroprotective effects in vivo by reducing atherosclerotic lesions.
PC immunization also reduces foam cell formation in vitro, indicating a potential therapeutic strategy.