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An immunohistochemical study of inflammatory abdominal aortic aneurysms
G Pasquinelli1, P Preda, M Gargiulo
1Institute of Clinical Electron Microscopy, University of Bologna, S. Orsola Hospital, Italy.
Journal of Submicroscopic Cytology and Pathology
|January 1, 1993
Summary
Inflammatory abdominal aortic aneurysms (IAs) involve atherosclerosis with inflammation and fibrosis. Findings suggest a B-cell response may drive IA development in advanced atherosclerosis.
Area of Science:
- Vascular Biology
- Immunohistochemistry
- Pathology
Background:
- Inflammatory abdominal aortic aneurysms (IAs) are a distinct pathological entity.
- Understanding the cellular and molecular mechanisms of IA pathogenesis is crucial.
Purpose of the Study:
- To investigate the histological and immunohistochemical features of inflammatory abdominal aortic aneurysms.
- To elucidate the potential role of immune responses in IA development.
Main Methods:
- Light microscopy, transmission electron microscopy (TEM), and immunohistochemistry were used.
- Analysis included cellular infiltration, extracellular matrix changes, and immune cell markers.
Main Results:
- Atherosclerosis coexisted with adventitial fibrosis and inflammation (follicular and diffuse patterns).
- TEM revealed smooth muscle cell changes, collagen, and elastin alterations.
- Immunohistochemistry identified B-cells, T-cells, macrophages, and dendritic reticulum cells within the inflammatory infiltrate. Immune deposits (IgM, IgG, C3c) and HLA-DR expression were observed.
Conclusions:
- IAs exhibit a complex inflammatory infiltrate with B-cell predominance.
- Pathogenic B-cell responses to local antigens may contribute to IA development in patients with advanced atherosclerosis.