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Cutaneous and systemic vasculitis: cellular players and pathogenetic aspects
1Servizio di Anatomia Patologica, Azienda Ospedaliera Carlo Poma, Mantova, Italy - angelo.cassisa@aopoma.it.
Insights
This paper explores vasculitis, a condition involving vascular wall damage and inflammation. It highlights the complex roles of various cells, including endothelial cells and neutrophils, in the immune response within blood vessels.
Area of Science:
- Immunology
- Pathology
- Vascular Biology
Background:
- Vasculitis involves vascular wall damage, inflammation, and remodeling.
- Histopathological classification depends on vessel size and inflammatory cell type.
- Emerging research reveals complex cellular pathophysiology in vessel walls.
Purpose of the Study:
- To discuss the complex pathophysiology of cellular components in the vascular wall.
- To highlight the active immunological roles of endothelial cells.
- To explore unexpected roles of perivascular microenvironment cells in vasculitis.
Main Methods:
- Literature review of cellular components in vasculitis.
- Analysis of endothelial cell and neutrophil functions.
- Examination of perivascular microenvironment cell involvement.
Main Results:
- Endothelial cells actively modulate immune responses.
- Neutrophils have more complex roles than previously thought.
- Inflammation spread within the vascular wall can occur through various pathways.
Conclusions:
- Vasculitis involves intricate cellular interactions within the vascular wall.
- A deeper understanding of cellular roles is crucial for understanding vasculitis.
- The paper aims to discuss these complex cellular concepts in detail.
Abstract:
Vascular wall damage, inflammatory cell recruitment and subsequent structural remodelling define a vasculitic process. Histopathological classification of vasculitis is based on the caliber of the vessel involved and on the prevalent type of inflammatory cells (neutrophils in acute forms, lymphocytic for chronic, histiocytic for granulomatous). A large amount of information is emerging from the literature on the complex pathophysiology of the cellular components of vessel wall. For instance, endothelial cells not only have the task to cover the inner surface of the vascular system but they also play an active role in tuning the immunological response in a very sophisticated way. Neutrophils are not only terminally differentiated cells sacrificed for a valuable cause. Cellular types of the perivascular microenvironment play roles one time not expected. The spread of the inflammatory process into the vascular wall is not necessarily inside-out. These and other selected concepts will be discussed in this paper.
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