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Il1-β involvement in cognitive impairment after sepsis
Francielle Mina1, Clarissa M Comim, Diogo Dominguini
1Laboratory of Neurosciences and National Institute for Translational Medicine (INCT-TM), Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina, 88806-000, Criciúma, SC, Brazil.
Molecular Neurobiology
|November 16, 2013
Summary
Sepsis-induced cognitive impairment is linked to brain inflammation. Blocking the IL-1β receptor with IL-1ra improved cognitive function and reduced inflammation in rats.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Sepsis triggers systemic inflammation, leading to central nervous system dysfunction and cognitive impairment.
- Interleukin-1 beta (IL-1β) is an early inflammatory cytokine altered during sepsis.
- Understanding IL-1β's role is crucial for addressing sepsis-related neurological complications.
Purpose of the Study:
- To investigate the role of IL-1β in sepsis-induced cognitive deficits.
- To evaluate the therapeutic potential of an IL-1β receptor antagonist (IL-1ra) on cognitive function, blood-brain barrier permeability, cytokine levels, oxidative stress, and energy metabolism.
Main Methods:
- Wistar rats underwent cecal ligation and perforation (CLP) to induce sepsis or sham operation.
- Animals received a single dose of IL-1ra immediately after CLP.
- Evaluations included cognitive tests (open field, step-down inhibitory avoidance), blood-brain barrier permeability, cytokine analysis (IL-1β, IL-6, TNF-α), oxidative stress markers, and mitochondrial complex I activity in brain regions.
Main Results:
- IL-1ra treatment reversed sepsis-induced increases in blood-brain barrier permeability and pro-inflammatory cytokine levels (IL-1β, IL-6, TNF-α) in the prefrontal cortex, hippocampus, and striatum.
- Treatment restored decreased mitochondrial complex I activity and normalized elevated oxidative stress parameters.
- IL-1ra administration significantly ameliorated cognitive impairment observed in septic rats.
Conclusions:
- Acute brain inflammatory response, specifically IL-1β signaling, plays a critical role in sepsis-associated cognitive dysfunction.
- IL-1ra demonstrates therapeutic potential by mitigating neuroinflammation, protecting the blood-brain barrier, and improving cognitive outcomes in a sepsis model.
