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Updated: May 2, 2026
A Mouse Model of Hemorrhagic Transformation Induced by Acute Hyperglycemia Combined with Transient Focal Ischemia
Published on: November 15, 2024
Differential production of reactive oxygen species in distinct brain regions of hypoglycemic mice
Leticia Amador-Alvarado1, Teresa Montiel, Lourdes Massieu
1División de Neurociencias, Departamento de Neuropatología Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México, D.F, 04510, México.
Abstract:
Hypoglycemia is a serious complication of insulin therapy in patients suffering from type 1 Diabetes Mellitus. Severe hypoglycemia leading to coma (isoelectricity) induces massive neuronal death in vulnerable brain regions such as the hippocampus, the striatum and the cerebral cortex. It has been suggested that the production of reactive oxygen species (ROS) and oxidative stress is involved in hypoglycemic brain damage, and that ROS generation is stimulated by glucose reintroduction (GR) after the hypoglycemic coma. However, the distribution of ROS in discrete brain regions has not been studied in detail. Using the oxidation sensitive marker dihydroethidium (DHE) we have investigated the distribution of ROS in different regions of the mouse brain during prolonged severe hypoglycemia without isoelectricity, as well as the effect of GR on ROS levels. Results show that ROS generation increases in the hippocampus, the cerebral cortex and the striatum after prolonged severe hypoglycemia before the coma. The hippocampus showed the largest increases in ROS levels. GR further stimulated ROS production in the hippocampus and the striatum while in the cerebral cortex, only the somatosensory and parietal areas were significantly affected by GR. Results suggest that ROS are differentially produced during the hypoglycemic insult and that a different response to GR is present among distinct brain regions.
Insights
Severe hypoglycemia in type 1 diabetes causes brain damage via reactive oxygen species (ROS). Glucose reintroduction after hypoglycemia further increases ROS in specific brain regions, particularly the hippocampus.
Area of Science:
- Neuroscience
- Endocrinology
- Biochemistry
Background:
- Hypoglycemia is a serious complication of insulin therapy for type 1 Diabetes Mellitus.
- Severe hypoglycemia can lead to neuronal death in vulnerable brain regions.
- Reactive oxygen species (ROS) and oxidative stress are implicated in hypoglycemic brain damage.
Purpose of the Study:
- To investigate the distribution of ROS in discrete mouse brain regions during prolonged severe hypoglycemia.
- To determine the effect of glucose reintroduction (GR) on ROS levels in different brain areas.
Main Methods:
- Utilized the oxidation-sensitive marker dihydroethidium (DHE) to detect ROS.
- Studied ROS distribution during prolonged severe hypoglycemia without coma.
- Assessed the impact of glucose reintroduction (GR) on ROS levels.
Main Results:
- ROS generation increased in the hippocampus, cerebral cortex, and striatum after prolonged severe hypoglycemia, prior to coma.
- The hippocampus exhibited the most significant increase in ROS levels.
- GR further stimulated ROS production in the hippocampus and striatum.
- In the cerebral cortex, GR primarily affected the somatosensory and parietal areas.
Conclusions:
- ROS are differentially produced in distinct brain regions during hypoglycemic insults.
- The response of ROS production to glucose reintroduction varies across different brain regions.
- Findings highlight regional susceptibility and ROS dynamics in hypoglycemic brain injury.
