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Published on: November 20, 2015
Neonatal Hypoglycemia and Brain Vulnerability
Laura Costanza De Angelis1,2, Giorgia Brigati1, Giulia Polleri1
1Neonatal Intensive Care Unit, Department Mother and Child, IRCCS Istituto Giannina Gaslini, Genoa, Italy.
Insights
Neonatal hypoglycemia, a common condition, can cause severe brain damage if prolonged. Understanding cerebral glucose homeostasis and injury mechanisms is key to developing effective treatments for affected newborns.
Area of Science:
- Neonatal medicine
- Neuroscience
- Biochemistry
Background:
- Neonatal hypoglycemia is a frequent condition, often a transient metabolic adaptation after birth.
- Factors like limited metabolic stores or increased energy expenditure can disrupt glucose homeostasis.
- While mild hypoglycemia's effects are unclear, severe, prolonged cases are linked to cerebral damage.
Purpose of the Study:
- To review cerebral glucose homeostasis in neonates.
- To elucidate mechanisms of brain injury resulting from neonatal hypoglycemia.
- To discuss potential therapeutic strategies for neonatal hypoglycemia.
Main Methods:
- Literature review of neonatal hypoglycemia.
- Analysis of mechanisms underlying hypoglycemia-induced neurotoxicity.
- Synthesis of current and potential treatment approaches.
Main Results:
- Specific brain regions show vulnerability to hypoglycemia, including the cerebral cortex, hippocampus, and caudate-putamen.
- Hypoglycemia-induced neuronal depolarization elevates glutamate and aspartate, leading to excitotoxicity.
- Extracellular zinc release activates poly ADP-ribose polymerase-1, contributing to neuronal death.
Conclusions:
- Neonatal hypoglycemia poses a risk for brain injury through excitotoxicity and other mechanisms.
- Further research into cerebral glucose regulation and neuroprotective strategies is warranted.
- Effective management of neonatal hypoglycemia is crucial to prevent long-term neurological deficits.
Abstract:
Neonatal hypoglycemia is a common condition. A transient reduction in blood glucose values is part of a transitional metabolic adaptation following birth, which resolves within the first 48 to 72 h of life. In addition, several factors may interfere with glucose homeostasis, especially in case of limited metabolic stores or increased energy expenditure. Although the effect of mild transient asymptomatic hypoglycemia on brain development remains unclear, a correlation between severe and prolonged hypoglycemia and cerebral damage has been proven. A selective vulnerability of some brain regions to hypoglycemia including the second and the third superficial layers of the cerebral cortex, the dentate gyrus, the subiculum, the CA1 regions in the hippocampus, and the caudate-putamen nuclei has been observed. Several mechanisms contribute to neuronal damage during hypoglycemia. Neuronal depolarization induced by hypoglycemia leads to an elevated release of glutamate and aspartate, thus promoting excitotoxicity, and to an increased release of zinc to the extracellular space, causing the extensive activation of poly ADP-ribose polymerase-1 which promotes neuronal death. In this review we discuss the cerebral glucose homeostasis, the mechanisms of brain injury following neonatal hypoglycemia and the possible treatment strategies to reduce its occurrence.
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