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Intramural platelet deposition in cerebral vasculopathy of systemic lupus erythematosus
Insights
Platelet fragments are incorporated into small cerebral vessel walls in systemic lupus erythematosus (SLE), contributing to vessel thickening. This finding is prominent in longstanding cases of central nervous system (CNS) SLE.
Area of Science:
- Neuropathology
- Immunology
- Vascular Biology
Background:
- Neuropsychiatric symptoms in systemic lupus erythematosus (SLE) are often linked to cerebral small vessel vasculitis.
- Antiphospholipid antibodies are implicated in triggering these vasculitic episodes.
Purpose of the Study:
- To investigate the hypothesis that platelet thrombi and vascular endothelium fragments integrate into the walls of small cerebral vessels in patients with SLE.
- To correlate these findings with the histopathological changes observed in central nervous system (CNS) SLE.
Main Methods:
- Analysis of necropsy brain tissue from six CNS SLE cases and 15 controls.
- Histochemical and immunocytochemical staining, including antibodies for platelet membrane glycoprotein IIIa (CD61) and vascular endothelium (CD31).
Main Results:
- Platelet membrane fragments were identified within the walls of small cortical and meningeal vessels in four out of six CNS SLE cases.
- These findings were associated with small vessel hyalinization and thickening, characteristic of longstanding CNS SLE.
- Similar platelet fragment deposition was not observed in SLE cases with acute vasculitis or short clinical histories.
Conclusions:
- The incorporation of platelet fragments into small cerebral vessel walls is a significant pathological feature in longstanding CNS SLE.
- This process likely contributes to the observed thickening and irregularity of these vessels.
- Concurrent thrombus formation may play a role in facilitating the incorporation of these fragments.
Aims:
To test the hypothesis that fragments of platelet thrombi and vascular endothelium are incorporated into the walls of small cerebral vessels in systemic lupus erythematosus (SLE).
Methods:
Six varied necropsy cases of central nervous system (CNS) SLE and 15 controls were studied. The controls were selected to represent a wide range of diseases in which the cerebral circulation is compromised. Tissue sections were stained by standard histochemical and immunocytochemical methods, the latter using antibodies to platelet membrane glycoprotein IIIa (CD61), and vascular endothelium (CD31).
Results:
In four of six cases of CNS SLE characterised by small vessel hyalinization and thickening, fragments of platelet membrane were found in the walls of small cortical and meningeal vessels. Similar findings were not evident in two other SLE cases that were characterised by relatively short clinical histories and an acute vasculitis. One control case of severe polyarteritis nodosa showed platelet fragment deposition in arteries larger than the vessels so affected in SLE.
Conclusions:
Previous studies have suggested that neuropsychiatric symptoms in SLE may be related to repeated episodes of vasculitis in small cerebral vessels that are triggered by antiphospholipid antibodies. Concurrent thrombus formation might facilitate the incorporation of platelet fragments into small vessel walls. This process contributes to the thickening and irregularity of small vessels, a major feature of longstanding cases of CNS SLE.