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In situ labelling of fragmented DNA in cutaneous necrotizing vasculitis
S Barduagni1, A Frezzolini, G Ferranti
1Department of Immunodermatology, Istituto Dermopatico dell'Immacolata, IDI, IRCCS, Rome, Italy.
Abstract:
Apoptosis is a biochemically and morphologically gene-regulated distinctive form of cell death playing a pivotal role in tissue homeostatic, viral infections and clearance of damaged cells. The process is initiated by a cascade of intercellular and intracellular signals through an intrinsic cell suicide program resulting in early DNA fragmentation characterized by nuclear and cytoplasmic condensation. Recently some authors have reported apoptosis to occur in several inflammatory skin diseases, such as lichenoid reactions and cutaneous lymphomas. The aim of our study is to investigate the apoptotic phenomenon in two different forms of cutaneous necrotizing vasculitis (CNV) affecting the postcapillary venules such as leukocytoclastic and lymphocytic cutaneous vasculitis. For this purpose, the in situ nick end labelling of fragmented DNA technique has been performed on lesional skin biopsies from patients with acute phase of the disease. In both leukocytoclastic and lymphocytic forms apoptotic bodies were detected, evidencing two different characteristic patterns of distribution, probably related to the different nature of cellular inflammatory infiltrate. Our results seem to account for the involvement of apoptotic phenomena in cutaneous vasculitis; furthermore, the evaluation of in situ DNA fragmentation could be a useful tool to discriminate different forms of the disease.
Insights
This study investigated apoptosis, a programmed cell death, in cutaneous necrotizing vasculitis. Apoptotic bodies were found in both leukocytoclastic and lymphocytic forms, suggesting apoptosis
Area of Science:
- Dermatology
- Cell Biology
- Pathology
Background:
- Apoptosis, or programmed cell death, is crucial for tissue homeostasis and clearing damaged cells.
- Recent research indicates apoptosis occurs in inflammatory skin conditions like cutaneous lymphomas.
- Cutaneous necrotizing vasculitis (CNV) involves inflammation of postcapillary venules.
Purpose of the Study:
- To investigate the role and patterns of apoptosis in two forms of cutaneous necrotizing vasculitis: leukocytoclastic and lymphocytic.
- To determine if DNA fragmentation analysis can differentiate between these vasculitis forms.
Main Methods:
- Utilized the in situ nick end labeling (TUNEL) technique.
- Analyzed lesional skin biopsies from patients in the acute phase of CNV.
- Examined both leukocytoclastic and lymphocytic cutaneous vasculitis.
Main Results:
- Apoptotic bodies were detected in both leukocytoclastic and lymphocytic forms of CNV.
- Distinct distribution patterns of apoptotic bodies were observed, potentially linked to infiltrate differences.
- Evidence suggests apoptosis is involved in the pathogenesis of cutaneous vasculitis.
Conclusions:
- Apoptosis plays a role in cutaneous necrotizing vasculitis.
- In situ DNA fragmentation analysis may aid in distinguishing between different forms of the disease.
- Further research into apoptotic pathways in CNV is warranted.