Atherosclerosis and innate immune signaling
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Updated: Aug 16, 2026

A Human Ex Vivo Atherosclerotic Plaque Model to Study Lesion Biology
Published on: May 6, 2014
Marc A Laberge1, Kathryn J Moore, Mason W Freeman
1Lipid Metabolism Unit, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.
Insights
Toll-like receptors (TLRs) activate innate immune pathways, driving chronic inflammation in atherosclerosis. Understanding TLRs and their ligands offers new therapeutic targets for this leading cause of death.
Area of Science:
- Immunology
- Cardiovascular Disease
- Pathogenesis of Atherosclerosis
Background:
- Atherosclerosis is a leading cause of mortality, characterized by arterial wall inflammation.
- Hypercholesterolemia and macrophage accumulation are linked to atherosclerosis, but inflammatory mechanisms are unclear.
- Innate and adaptive immune responses are key areas of study in atherosclerosis pathogenesis.
Purpose of the Study:
- To review the critical role of Toll-like receptors (TLRs) and their signaling pathways in atherosclerosis.
- To highlight the importance of identifying specific TLRs and their activating ligands in disease development.
- To explore the potential of targeting these pathways for therapeutic intervention.
Main Methods:
- Review of current scientific literature on Toll-like receptors and atherosclerosis.
- Analysis of innate immune signaling pathways involved in chronic inflammation.
- Discussion of recent findings linking TLRs to atherogenesis.
Main Results:
- Innate immune signaling pathways, particularly those involving Toll-like receptors (TLRs), are implicated in initiating and sustaining atherosclerosis.
- Activation of TLRs contributes to the chronic inflammatory cascade characteristic of the disease.
- Specific TLRs and their ligands are emerging as crucial factors in the development of atherosclerosis.
Conclusions:
- Toll-like receptors play a critical role in the pathogenesis of atherosclerosis.
- Further research into individual TLRs and their ligands is essential for understanding atherogenesis.
- Targeting TLR signaling pathways presents a promising strategy for therapeutic manipulation of atherosclerotic inflammation.
Abstract:
Atherosclerosis, the leading cause of death in developed countries, is characterized by chronic inflammation in the artery wall. It has been appreciated for decades that this disease is linked to hypercholesterolemia and the accumulation of macrophages in the artery wall, yet the exact mechanisms underlying this inflammatory process remain unclear. The role of innate and adaptive immune responses in the pathogenesis of atherosclerosis has been an area of intense study. It now appears that activation of innate immune signaling pathways designed to protect us from microbes may be responsible for initiating and feeding the chronic inflammatory cascade that characterizes this disease. In this review, we discuss the recent identification of Toll-like receptors and their downstream signaling pathways as critical contributors to atherosclerosis. Unraveling the contribution of individual Toll-like receptors and identifying the ligands that activate these pathways will be a central focus of atherosclerosis research in the next few years. The involvement of these pathways in atherogenesis will not only open up new avenues of investigation, but it also provides new targets for therapeutic manipulation that could ameliorate the atherosclerotic inflammatory response directly.
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