Source Paper
Interleukin-1β Immunoreactivity and Microglia Are Enhanced in the Rat Hippocampus by Focal Kainate Application: Functional Evidence for Enhancement of Electrographic Seizures
Annamaria Vezzani, Mirko Conti, Ada De Luigi, Teresa Ravizza, Daniela Moneta et al.
Journal of Neuroscience • 1999
Bicuculline-Induced Seizure Model
Objective: To investigate whether EEG seizures induced by bicuculline methiodide (a non-excitotoxic convulsant) enhance IL-1β immunoreactivity and microglia changes in the hippocampus without causing neuronal cell loss
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Equipment1
Not specified • Not specified • Not specified • Not specified
Materials4
Software1
Not specified • Not specified
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Protocol Steps
Intrahippocampal bicuculline methiodide injection
Perform unilateral intrahippocampal application of bicuculline methiodide to induce EEG seizures
Note: Bicuculline methiodide is a non-excitotoxic convulsant that induces seizures without causing neuronal cell loss
View evidence from paper
“Intrahippocampal application of 0.77 nmol of bicuculline methiodide, which induces EEG seizures but not cell loss”
EEG seizure monitoring
Record and monitor electroencephalographic seizure activity following bicuculline injection
Note: Seizure activity serves as a marker of response to the convulsant
View evidence from paper
“measured the effect of human recombinant (hr)IL-1β on seizure activity as one marker of the response”
Tissue collection for immunocytochemistry
Collect hippocampal tissue at specified timepoints for analysis of IL-1β immunoreactivity and microglia changes
Note: Tissue collected from both injected and contralateral hippocampi
View evidence from paper
“Three and 24 hr after unilateral intrahippocampal application of 0.19 nmol of kainate, IL-1β immunoreactivity was enhanced”
Immunocytochemistry analysis
Perform immunocytochemistry to assess IL-1β immunoreactivity and reactive microglia in hippocampal tissue
Note: Examine both injected and contralateral hippocampi for comparison
View evidence from paper
“Using immunocytochemistry and ELISA, we investigated the production of interleukin (IL)-1β in the rat hippocampus”
ELISA quantification
Perform ELISA to quantify IL-1β concentration in hippocampal tissue
Note: Measure IL-1β levels at 24 hours post-injection
View evidence from paper
“Using immunocytochemistry and ELISA, we investigated the production of interleukin (IL)-1β”
IL-1β functional study - pre-treatment injection
Intrahippocampally inject human recombinant IL-1β 10 minutes before kainate application
Note: Used to test functional role of IL-1β in seizure activity
View evidence from paper
“One nanogram of (hr)IL-1β intrahippocampally injected 10 min before kainate enhanced by 226% the time spent in seizures”
Seizure duration measurement
Measure and quantify the time spent in seizures following IL-1β pre-treatment and kainate injection
Note: Primary outcome measure for IL-1β functional effects
View evidence from paper
“enhanced by 226% the time spent in seizures ( p < 0.01)”
Antagonist co-injection study
Co-inject IL-1β receptor antagonist or NMDA receptor antagonist with IL-1β to block seizure enhancement
Note: Tests whether IL-1β effects are mediated through IL-1β and NMDA receptors
View evidence from paper
“This effect was blocked by coinjection of 1 μg (hr)IL-1β receptor antagonist or 0.1 ng of 3-((+)-2-carboxypiperazin-4-yl)-propyl-1-phosphonate”