The depolarizing action of GABA in cultured hippocampal neurons is not due to the absence of ketone bodies.
The depolarizing action of GABA in cultured hippocampal neurons is not due to the absence of ketone bodies.
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DOI：
10.1371/journal.pone.0023020
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
McCarthy MM
中科院分区：
文献类型：
--
作者：
Waddell J;Kim J;Alger BE;McCarthy MM
Two recent reports propose that the depolarizing action of GABA in the immature brain is an artifact of in vitro preparations in which glucose is the only energy source. The authors argue that this does not mimic the physiological environment because the suckling rats use ketone bodies and pyruvate as major sources of metabolic energy. Here, we show that availability of physiologically relevant levels of ketone bodies has no impact on the excitatory action of GABA in immature cultured hippocampal neurons. Addition of β-hydroxybutyrate (BHB), the primary ketone body in the neonate rat, affected neither intracellular calcium elevation nor membrane depolarizations induced by the GABA-A receptor agonist muscimol, when assessed with calcium imaging or perforated patch-clamp recording, respectively. These results confirm that the addition of ketone bodies to the extracellular environment to mimic conditions in the neonatal brain does not reverse the chloride gradient and therefore render GABA hyperpolarizing. Our data are consistent with the existence of a genuine “developmental switch” mechanism in which GABA goes from having a predominantly excitatory role in immature cells to a predominantly inhibitory one in adults.
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