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Breakdown of the blood-brain barrier in murine cerebral malaria
C M Thumwood1, N H Hunt, I A Clark
1Department of Experimental Pathology, John Curtin School of Medical Research, Australian National University, Canberra.
Abstract:
Cerebral malaria in A/J and CBA/H mice infected with Plasmodium berghei ANKA is accompanied by mononuclear cell infiltration, haemorrhage and cerebral endothelial cell damage. This damage is presumably one of the causes of the breakdown of the blood-brain barrier which was detected by measuring the movement of the dye Evans blue and radioisotope labelled albumin and erythrocytes. The density of brain tissue, measured by a Percoll gradient technique, was significantly reduced in mice exhibiting cerebral symptoms, suggesting the occurrence of cerebral oedema.
Insights
Cerebral malaria causes brain swelling and blood-brain barrier breakdown in mice. Researchers observed endothelial cell damage and increased fluid in the brain, indicating cerebral edema.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Cerebral malaria (CM) is a severe complication of Plasmodium infection.
- CM pathogenesis involves inflammation, endothelial damage, and blood-brain barrier (BBB) disruption.
- Understanding CM mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the pathological changes in the brain during experimental cerebral malaria (ECM) in mice.
- To assess the integrity of the blood-brain barrier (BBB) in ECM.
- To determine the presence and extent of cerebral edema in ECM.
Main Methods:
- Induction of ECM in A/J and CBA/H mice using Plasmodium berghei ANKA.
- Assessment of cerebral pathology, including mononuclear cell infiltration, hemorrhage, and endothelial cell damage.
- Evaluation of BBB permeability using Evans blue dye, radio-labeled albumin, and erythrocytes.
- Measurement of brain tissue density using a Percoll gradient technique.
Main Results:
- ECM was characterized by significant mononuclear cell infiltration, hemorrhage, and cerebral endothelial cell damage.
- Evidence of BBB breakdown was confirmed by the increased movement of tracers across the barrier.
- Brain tissue density was significantly reduced in symptomatic mice, indicative of cerebral edema.
Conclusions:
- Cerebral malaria in mice involves significant neuroinflammation and vascular damage.
- Blood-brain barrier dysfunction is a key feature of experimental cerebral malaria.
- Cerebral edema is a prominent pathological finding in this model, contributing to disease severity.