Endotoxin challenge leads to septic shock, multi-organ failure and death in mice. Permeability of the blood-brain barrier (BBB) is increased by endotoxemia. Serum amyloid P component (SAP) is a lipopolysaccharide (LPS)-binding protein that can modulate the host reactions during infections. It is controversial whether SAP can protect from LPS toxicity in vivo or not. We have tested the effect of human SAP on BBB permeability of Salmonella typhimurium LPS-injected mice. The animals showed signs of sickness behaviour including immobility, anorexia, and diarrhoea. Intraperitoneally administered LPS increased the BBB permeability for sodium fluorescein for about 4-fold, and for albumin for more than 2-fold in brain cortex. SAP, given intravenously, had no effect on basal BBB permeability for albumin, although it decreased sodium fluorescein extravasation to brain tissue. In LPS-treated mice, SAP administration alleviated the symptoms of septic shock, and significantly inhibited the enhanced BBB permeability for both tracers. Our data indicate that human SAP may counteract the toxic effects of LPS during septic shock.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.neulet.2003.08.028 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Basic Science and Pathogenesis.
Alzheimers Dement
December 2024
Eli Lilly and Company, Indianapolis, IN, USA.
Background: Anti-amyloid-β (Aβ) immunotherapy trials have shown amyloid-related imaging abnormalities (ARIA) as the most common and serious adverse events linked to pathological changes in cerebral vasculature. Nevertheless, the mechanisms underlying how amyloid immunotherapy triggers vascular damage, increases vascular permeability, and results in microhemorrhages remains unclear. Notably, activation of perivascular macrophages and infiltration of peripheral immune cells have been implicated in regulating cerebrovascular damage.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA.
Background: Vascular dysfunction, blood-brain barrier (BBB) dysregulation, and neuroinflammation are thought to participate in Alzheimer`s disease (AD) pathogenesis, though the mechanism is poorly understood. Among pathways of interest, AD pathology appears to affect vascular endothelial growth factor-A (VEGFA) signaling in a bidirectional manner. Higher VEGF levels are thought to have a protective role and slow cognitive decline.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Alzheimer's Center at Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA.
Background: Brain endothelial cell (EC) stress, including that induced by vascular amyloid β (Aβ) deposits in cerebral amyloid angiopathy (CAA) and Alzheimer's disease (AD), contributes to cerebral blood flow impairment, blood brain barrier (BBB) damage, neurovascular unit dysfunction, microhemorrhages and hypoperfusion, precipitating neurodegeneration and neuroinflammation processes. Epidemiological and experimental evidence suggests that hyperhomocysteinemia (Hhcy) contributes to increasing AD risk as well as CAA pathology. However, the cellular and molecular mechanisms through which Aβ and Hhcy drive EC and BBB dysfunction, whether the molecular effects of these challenges are additive or independent, and possible therapeutic strategies, remain to be determined.
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Tulane University, New Orleans, LA, USA.
Background: It is well established that genetic factors are implicated in the development of Alzheimer's disease (AD), but there is growing interest in how environmental factors like infection contribute to its progression. Recent evidence suggests that greater exposure to infections across the lifespan can potentiate the rate and severity of cognitive decline. In addition to contributing to mechanisms underlying the aggregation of Aβ fragments and phosphorylation of tau proteins, the infectious etiology of dementia may be caused by infectious agents triggering neuroinflammatory pathways and degradation of the blood-brain barrier (BBB).
View Article and Find Full Text PDFBasic Science and Pathogenesis.
Alzheimers Dement
December 2024
Alzheimer's Center at Lewis Katz School of Medicine, Temple University, Philadelphia, PA, USA.
Background: Alzheimer's disease (AD) is characterized- at both early and late stages- by neurovascular impairment. In AD, dysfunctional cerebral microvasculature is accompanied by an inflammatory response, contributing to Aβ and tau accumulation, brain cell stress and death, impaired clearance of metabolic waste, BBB permeability, and ultimately leading to neuronal demise and cognitive impairment. We previously showed that Aβ peptides induce mitochondrial dysregulation and caspase-mediated apoptosis in brain cells, including endothelial, glial, and smooth muscle cells.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!