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Sialic acid as a protective barrier against neointima development
Luis A Cuniberti1, Verónica Martinez, Julieta Schachter
1Lipid and Atherosclerosis Research Laboratory, Department of Pathology, Favaloro University, Buenos Aires, Argentina. cuniberti@favaloro.edu.ar
Atherosclerosis
|July 26, 2005
Summary
Reducing arterial sialic acid (SA) accelerates intimal thickening and smooth muscle cell proliferation. This suggests SA plays a protective role against early atherosclerosis development.
Area of Science:
- Biochemistry
- Vascular Biology
- Pathology
Background:
- Arterial sialic acid (SA) is known to inhibit fibrinogen and low-density lipoprotein (LDL) binding to the vessel wall.
- This interaction suggests a protective role for SA against atherosclerosis.
Purpose of the Study:
- To investigate the impact of reduced SA levels on intimal thickening.
- To assess the effect of arterial desialylation on smooth muscle cell (SMC) proliferation and lipoprotein accumulation.
Main Methods:
- New Zealand white rabbits underwent carotid artery periarterial collaring.
- Arteries were perfused with neuraminidase to remove SA or vehicle as a control.
- Morphological and cellular changes were assessed at 7 and 14 days post-intervention.
Main Results:
- Neuraminidase reduced arterial SA by 16.7%.
- Desialylation significantly increased neointimal formation and SMC proliferation.
- Oxidized-LDL (ox-LDL) immunostaining was slightly elevated in desialylated arteries.
Conclusions:
- Mild reduction in arterial SA promotes intimal thickening.
- Enhanced SMC proliferation and potential facilitation of atherogenic lipoprotein accretion contribute to this effect.
- SA may play a crucial role in preventing neointimal development and protecting against atherosclerosis.