Related Experiment Video
Updated: Aug 15, 2026
Quantitative Analysis and Characterization of Atherosclerotic Lesions in the Murine Aortic Sinus
Published on: December 7, 2013
Coronary atherosclerosis revisited. A pathologist's view
Insights
Early coronary atherosclerosis involves intimal changes and smooth muscle cell proliferation, not just advanced calcified lesions. Understanding these initial stages is key to grasping atherogenesis and its potential link to coronary artery spasms.
Area of Science:
- Cardiovascular Pathology
- Vascular Biology
- Atherosclerosis Research
Background:
- Traditional views of coronary atherosclerosis focused on advanced lesions with calcifications.
- Studying coronary arteries in individuals without obstructive disease offers insights into early atherogenesis.
- Normal coronary arteries reveal discrete intimal changes, including internal elastic lamina splitting and smooth muscle cell proliferation.
Purpose of the Study:
- To investigate the early histological changes in coronary arteries.
- To understand the fundamental processes of atherogenesis.
- To explore the relationship between early atherosclerotic changes and vascular tone.
Main Methods:
- Histological examination of coronary arteries from patients without clinical evidence of obstructive coronary artery disease.
- Analysis of intimal changes, including internal elastic lamina integrity and cellular composition.
- Correlation of early lesion features with the development of the musculo-elastic layer.
Main Results:
- Early intimal changes involve internal elastic lamina splitting and vascular smooth muscle cell proliferation, forming a musculo-elastic layer.
- This musculo-elastic layer transforms into a fibrous texture over time.
- The histological features of the musculo-elastic layer are observed at the base of early atherosclerotic plaques.
- Endothelial cell barrier dysfunction may be critical in this process.
- Atherogenesis mechanisms may also influence vascular tone, potentially causing coronary artery spasms.
Conclusions:
- The basic lesion in coronary atherosclerosis is likely a proliferation of vascular smooth muscle cells, possibly in response to injury.
- Early atherosclerotic changes and mechanisms of atherogenesis may contribute to coronary artery spasms.
- A simple classification of angina pectoris into organic and spastic may be an oversimplification.
Abstract:
For many years the paradigm of coronary atherosclerosis, set by pathologists, was the far-advanced lesion containing extensive atheromatosis with calcifications. From the point of view of understanding atherogenesis, however, it is much more rewarding to study the coronary artery in patients without clinical evidence of obstructive coronary artery disease. In fact, the normal coronary artery is most revealing in showing discrete intimal changes, which consist of a splitting of the internal elastic lamina accompanied by a proliferation of vascular smooth muscle cells. This process eventually results in the formation of the musculo-elastic layer. In time the cellular and muscular appearance of this layer gradually transforms into a more densely packed fibrous texture. It is of interest, from a point of view of atherogenesis, that the early atherosclerotic lesions often display the histologic features of the musculo-elastic layer at the base of the plaque. Hence, these observations support the concept that the basic lesion in coronary atherosclerosis is a proliferation of vascular smooth muscle cells, most likely as a response to injury. To this extent a dysfunction of the endothelial cell barrier may by crucial. The observations also indicate that the mechanisms involved in atherogenesis also may alter vascular tone and hence, may contribute to a "spastic state" of the coronary arteries. A classification of angina pectoris, on the basis of pathogenesis into organic and spastic may thus prove to be simplistic.
Related Concept Videos
01:30Coronary Artery Disease I: Introduction
01:26Coronary Artery Disease II: Pathophysiology
01:19Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations
01:30Atherosclerosis I: Introduction
01:27Atherosclerosis II: Clinical Manifestations and Diagnostic Tests
01:26Atherosclerosis III: Management