Consequences of perinatal hypoxia in developing brain: Changes in GABA transporter functioning in cortical, hippocampal and thalamic rat nerve terminals. Issue 63 (December 2017)

• Record Type: Journal Article
• Authors: Pozdnyakova, Natalia
• Is Part Of: International journal of developmental neuroscience. Issue 63(2017:Dec.)
• Page Start: 1
• Page End: 7
• Publication Date: 2017-12
• Subjects: GABA (γ-aminobutyric acid) -- GATs (GABA transporters) -- NO-711 (Tetrahydro-1-(2-(((diphenylmethylene)amino)oxy)ethyl)-3-pyridinecarboxylic acid hydrochloride) -- ANOVA analysis of variance -- pd post-natal day -- S.E.M. standard error of the mean; Perinatal hypoxia -- Plasma membrane GABA transporters -- Nerve terminals -- Rat brain cortex -- Hippocampus -- Thalamus; Developmental neurobiology -- Periodicals; Neurology -- Periodicals; Neurologie du développement -- Périodiques; Developmental neurobiology; Periodicals; 612.8
• DOI: 10.1016/j.ijdevneu.2017.09.002
• Languages: English
• ISSNs: 0736-5748

Abstract

Highlights: Age-dependent decrease in GABA uptake had different dynamics in brain structures. Perinatal hypoxia caused a significant attenuation in GABA uptake in developing hippocampus. Exposure to hypoxia had no effect on GABA uptake in developing cortex and thalamus. 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 [ 3 H]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 12 min (up to the initiation of clonico-tonic seizures). Here, we found that the initial rate of [ 3 Н]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 [ 3 Н]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 [ 3 Н]GABA uptake with step-like dynamics of changes was shown in the thalamus and cortex. Gradual age-dependent hypoxia-dependent decrease in [ 3 Н]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.