SIRT1 decreases Lox-1-mediated foam cell formation in atherogenesis

Sokrates Stein ¹, Christine Lohmann , Nicola Schäfer

⁰Cardiovascular Research, Institute of Physiology, Zurich University and Cardiology, Cardiovascular Center, University Hospital Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.

European Heart Journal +

|

April 27, 2010

View abstract on PubMed

Summary

Sirtuin 1 (SIRT1) protects against atherosclerosis by inhibiting foam cell formation in macrophages. Activating SIRT1 may offer a new therapeutic strategy for preventing atherosclerosis.

Area Of Science

Cardiovascular Research
Molecular Biology
Cellular Metabolism

Background

Atherogenesis involves endothelial activation, macrophage infiltration, and foam cell formation.
Sirtuin 1 (SIRT1), a class III deacetylase, has critical metabolic functions.
The role of SIRT1 in plaque macrophages and its impact on atherogenesis require further investigation.

Purpose Of The Study

To analyze the role of SIRT1 in plaque macrophages.
To determine SIRT1's function in the process of atherogenesis.

Main Methods

Utilized partial SIRT1 deletion in atherosclerotic mouse models.
Investigated peritoneal macrophage behavior in heterozygous SIRT1 mice.
Performed bone marrow-restricted SIRT1 deletion to confirm macrophage-specific effects.
Examined the impact of SIRT1 on oxidized low-density lipoprotein (oxLDL) uptake and the NF-κB signaling pathway.

Main Results

SIRT1 deletion in macrophages exacerbates atherosclerosis.
Macrophages from heterozygous SIRT1 mice show increased accumulation of oxLDL, promoting foam cell formation.
SIRT1 deletion in bone marrow-derived macrophages is sufficient to reduce atherogenesis.
SIRT1 suppresses oxLDL uptake by downregulating lectin-like oxLDL receptor-1 (Lox-1) expression via NF-κB pathway inhibition.

Conclusions

SIRT1 exhibits protective effects against atherosclerosis.
Reduced macrophage foam cell formation is a key mechanism of SIRT1's protective action.
Pharmacological activation of SIRT1 presents a potential novel anti-atherosclerotic therapeutic strategy.

Related Concept Videos