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Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
Consequences of perinatal hypoxia in developing brain: Changes in GABA transporter functioning in cortical,
1Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, Leontovicha Str. 9, Kiev, 01030, Ukraine.
Insights
Perinatal hypoxia impacts brain development, altering gamma-aminobutyric acid (GABA) uptake. Hypoxia specifically reduced GABA uptake in the hippocampus, suggesting its vulnerability in developing brains.
Area of Science:
- Neuroscience
- Developmental Biology
- Neurochemistry
Background:
- Perinatal hypoxia can cause lasting neurological deficits, including cognitive and behavioral issues.
- Gamma-aminobutyric acid (GABA) plays a critical role in immature brain development and network formation.
- Understanding GABAergic system alterations is key to addressing hypoxia-induced brain damage.
Purpose of the Study:
- To investigate the impact of perinatal hypoxia on transporter-mediated GABA uptake in rat brain regions.
- To analyze age-dependent changes in GABA uptake in control and hypoxia-exposed rats.
- To identify specific brain structures vulnerable to hypoxia-induced alterations in GABAergic signaling.
Main Methods:
- Induction of hypoxia in rat pups at postnatal day 10 via low oxygen exposure.
- Isolation of cortical, hippocampal, and thalamic nerve terminals for analysis.
- Measurement of transporter-mediated [3H]GABA uptake rates across different age groups (postnatal days 17-73).
Main Results:
- GABA uptake rates were highest in young rats and decreased with age across all studied brain regions.
- Perinatal hypoxia did not significantly affect GABA uptake in cortical or thalamic terminals.
- Hypoxia caused a significant, age-dependent decrease in hippocampal GABA uptake, indicating structural vulnerability.
Conclusions:
- The developing hippocampus exhibits a distinct vulnerability to perinatal hypoxia, evidenced by reduced GABA uptake.
- Age-dependent changes in GABA uptake occur independently of hypoxia in the cortex and thalamus.
- Findings highlight the critical role of the GABAergic system in perinatal brain injury and suggest targeted interventions for hippocampal dysfunction.
Abstract:
Perinatal hypoxia leads to behavioral abnormalities, cognitive disabilities, and epilepsy resulting from alterations in neurodevelopment, maturation and construction of the network. Considering a particular role of γ-aminobutyric acid (GABA) for an immature brain, we analysed transporter-mediated [3H]GABA uptake in the cortical, hippocampal and thalamic nerve terminals isolated from rats of different age in the control and after perinatal hypoxia. The state of hypoxia was induced by exposure of rats at the age of 10 postnatal days (pd) (that corresponds approximately to the time of birth in humans) to a respiratory medium with low O2 content (4% O2 and 96%N2) for 12min (up to the initiation of clonico-tonic seizures). Here, we found that the initial rate of [3Н]GABA uptake was higher in the young rats (pd 17-19) as compared to the older ones (pd 24-26, 38-40 and 66-73) in both control and hypoxia groups. It decreased abruptly by 50% in the thalamus and by 25% in the cortex for the period from pd 17-19 to pd 66-73. In the hippocampus, a decrease in the rate during the same time interval was 25%. Exposure to hypoxia had no effect on the intensity of [3Н]GABA uptake by the cortical and thalamic nerve terminals, but caused a significant age-dependent attenuation (by 35%) of the uptake intensity in the hippocampal ones. Significant age-dependent hypoxia-independent decrease in [3Н]GABA uptake with step-like dynamics of changes was shown in the thalamus and cortex. Gradual age-dependent hypoxia-dependent decrease in [3Н]GABA uptake was revealed in the hippocampus, and so a particular vulnerability of the latest structure to hypoxia as compared to the cortex and thalamus was revealed.
