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Purpura cerebri in gram-negative septicaemia. A histological and immunohistochemical study
1Institute of Neuropathology, Free University Berlin, FRG.
Abstract:
Two cases with brain purpura following Gram-negative septicaemia were examined morphologically and immunohistochemically. The brain lesions, including ball and ring haemorrhages, a few days old, with some microglial cells accumulated around the older foci, were restricted to the white matter. Immunohistochemically, scanty deposits of IgG, IgA and IgM mainly in the macrophages in brain, kidneys and lungs were found, whereas staining with antibodies directed against IgE and complement (C3, C4) remained negative. In the brain, immunoglobulin deposits were located mainly in the macrophages, furthermore, in and around the walls of a few intact (non-haemorrhagic) vessels; within the perivascular haemorrhagic foci no deposits could be demonstrated. The relevance of these observations to the pathogenesis of brain purpura is discussed.
Insights
Brain purpura following Gram-negative septicaemia involves white matter lesions. Immunoglobulin deposits were found in macrophages, not directly in haemorrhagic areas, suggesting a role in pathogenesis.
Area of Science:
- Neuropathology
- Immunopathology
- Infectious Diseases
Background:
- Gram-negative septicaemia can lead to severe complications, including neurological manifestations.
- Brain purpura is a rare but serious condition characterized by haemorrhagic lesions in the brain.
- Understanding the underlying mechanisms of brain purpura is crucial for effective treatment.
Observation:
- Morphological examination revealed brain lesions, specifically ball and ring haemorrhages, predominantly in the white matter.
- Microglial cells were observed accumulating around older haemorrhagic foci.
- Immunohistochemical analysis showed scanty deposits of IgG, IgA, and IgM, primarily within macrophages in the brain, kidneys, and lungs.
Findings:
- Immunoglobulin deposits were mainly located in macrophages and around intact vessels in the brain.
- No immunoglobulin deposits were detected within the perivascular haemorrhagic foci.
- Staining for IgE and complement components (C3, C4) was negative.
Implications:
- These findings suggest that macrophages play a significant role in the deposition of immunoglobulins in brain purpura.
- The absence of deposits in haemorrhagic areas may indicate a complex pathogenesis not solely driven by direct antibody-mediated vascular damage.
- Further research is warranted to elucidate the precise role of these immunoglobulin deposits and macrophages in the development of Gram-negative septicaemia-associated brain purpura.