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http://dx.doi.org/10.22537/jksct.17.2.66

Application of Thallium Autometallography for Observation of Changes in Excitability of Rodent Brain following Acute Carbon Monoxide Intoxication  

Lee, Min Soo (Department of Emergency Medicine, Wonkwang University School of Medicine)
Yang, Seung Bum (Department of Medical Non-commissioned Officer, Wonkwang Health Science University)
Heo, Jun Ho (Department of Emergency Medicine, Wonkwang University School of Medicine)
Publication Information
Journal of The Korean Society of Clinical Toxicology / v.17, no.2, 2019 , pp. 66-78 More about this Journal
Abstract
Purpose: Thallium (TI+) autometallography is often used for the imaging of neuronal metabolic activity in the rodent brain under various pathophysiologic conditions. The purpose of this study was to apply a thallium autometallographic technique to observe changes in neuronal activity in the forebrain of rats following acute carbon monoxide (CO) intoxication. Methods: In order to induce acute CO intoxication, adult Sprague-Dawley rats were exposed to 1100 ppm of CO for 40 minutes, followed by 3000 ppm of CO for 20 minutes. Animals were sacrificed at 30 minutes and 5 days after induction of acute CO intoxication for thallium autometallography. Immunohistochemical staining and toluidine blue staining were performed to observe cellular damage in the forebrain following intoxication. Results: Acute CO intoxication resulted in significant reduction of TI+ uptake in major forebrain structures, including the cortex, hippocampus, thalamus, and striatum. In the cortex and hippocampal CA1 area, marked reduction of TI+ uptake was observed in the cell bodies and dendrites of pyramidal neurons at 30 minutes following acute CO intoxication. There was also strong uptake of TI+ in astrocytes in the hippocampal CA3 area following acute CO intoxication. However, there were no significant histological findings of cell death and no reduction of NeuN (+) neuronal populations in the cortex and hippocampus at 5 days after acute CO intoxication. Conclusion: The results of this study suggest that thallium autometallography can be a new and useful technique for imaging functional changes in neural activity of the forebrain structure following mild to moderate CO intoxication.
Keywords
CO intoxication; Thallium; Autometallography; Cortex;
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