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Updated: Jul 16, 2026
A Ferret Model of Inflammation-sensitized Late Preterm Hypoxic-ischemic Brain Injury
Published on: November 19, 2019
Inflammation-induced preconditioning in the immature brain
Carina Mallard1, Henrik Hagberg
1Perinatal Center, Department of Neuroscience and Physiology, Sahlgrenska Academy, Göteborg University, Box 432, Göteborg, Sweden. carina.mallard@gu.se
Insights
Lipopolysaccharide (LPS) preconditioning protects immature brains from injury by modulating immune responses and cell death pathways. This neuroprotection involves corticosterone and significant cerebral gene regulation.
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- Infections pose significant risks for perinatal brain injury.
- Inflammation can paradoxically precondition and protect the developing brain.
- Lipopolysaccharide (LPS) interactions with other events are under investigation.
Purpose of the Study:
- To investigate the neuroprotective effects of LPS preconditioning in an immature brain model.
- To explore the underlying mechanisms, including gene regulation and corticosterone levels.
Main Methods:
- Administered LPS 24 hours before hypoxia-ischemia in 7-day-old rats.
- Assessed neuroprotection and measured endogenous corticosterone levels.
- Performed gene ontology analysis on cerebral gene regulation.
Main Results:
- LPS administration provided significant neuroprotection against hypoxia-ischemia.
- Neuroprotection correlated with increased endogenous corticosterone.
- Gene ontology analysis revealed over-representation of immune and inflammatory genes.
- Several cell death/survival genes were also significantly up-regulated 24 hours post-LPS exposure.
Conclusions:
- LPS preconditioning confers neuroprotection to the immature brain.
- Mechanisms involve immune activation, corticosterone, and regulation of cell death/survival pathways.
- Understanding these pathways is crucial for developing therapeutic strategies against perinatal brain injury.
Abstract:
Infections are important risk factors of perinatal brain injury. However, under certain circumstances, inflammation mediates preconditioning and provides protection to the immature brain. Recent experimental studies have examined the interaction of lipopolysaccharide (LPS) with other events. Evidence demonstrates that LPS administered 24h before hypoxia-ischemia in 7-day-old rats provides neuroprotection, which is associated with up-regulation of endogenous corticosterone but is also linked to significant cerebral gene regulation. Gene ontology analysis reveals that the most over-represented genes belong to immune and inflammatory processes. However, a number of cell death/survival genes, including complement component 1, complement component 3, aquaporin 4, epidermal growth factor receptor pathway substrate 15 and PYD and CARD domain containing are also significantly up-regulated 24h following LPS exposure. These results suggest that in addition to immune-related activation, transcription of cell death pathways may be important in LPS-induced preconditioning in the immature brain.
