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The process of atherogenesis--cellular and molecular interaction: from experimental animal models to humans
Insights
Atherosclerosis, a chronic inflammatory disease, involves the buildup of plaque in artery walls. This process, driven by immune cells and lipids, transforms a protective response into a disease state.
Area of Science:
- Cardiovascular Biology
- Immunology
- Pathology
Background:
- Atherogenesis is a complex arterial wall disorder.
- It involves immune cell adhesion, migration, and differentiation.
- Lipid accumulation and foam cell formation are key features.
Purpose of the Study:
- To elucidate the cellular and molecular mechanisms of atherogenesis.
- To understand the role of chronic inflammation in this process.
Main Methods:
- The study describes the sequential cellular events in atherogenesis.
- It highlights the involvement of monocytes, lymphocytes, macrophages, and smooth muscle cells.
- The role of cytokines and growth factors is emphasized.
Main Results:
- Monocytes differentiate into macrophages, ingesting low-density lipoproteins (LDL) to form foam cells.
- Fatty streaks are formed by foam cells and T lymphocytes.
- Vascular smooth muscle cells contribute to plaque formation.
Conclusions:
- Atherosclerosis is characterized by chronic inflammation and fibroproliferation.
- An excessive protective inflammatory response can lead to the disease state.
- Understanding these mechanisms is crucial for developing therapeutic strategies.
Abstract:
Atherogenesis is a disorder of the artery wall that involves: adhesion of monocytes and lymphocytes to the endothelial cell surface; migration of monocytes into the sub-endothelial space and differentiation into macrophages; ingestion of low density lipoproteins and modified or oxidised low density lipoproteins by macrophages by several pathways, including a scavenger pathway, leading to accumulation of cholesterol esters and formation of "foam cells". These foam cells together with T lymphocytes form the fatty streak. Vascular smooth muscle cells migrate from the media into the intima and proliferate with the formation of atherosclerotic plaques. These processes which involve cell adhesion, migration, differentiation, proliferation and cell interaction with the extracellular matrix are regulated by a complex network/cascade of cytokines and growth regulatory peptides. Thus, atherosclerosis may be the result of a specialised chronic inflammatory fibroproliferative process which has become excessive and in its excess this protective response has become the disease state.