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Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
Polyamine catabolism is enhanced after traumatic brain injury
Kamyar Zahedi1, Francis Huttinger, Ryan Morrison
1Department of Internal Medicine, Division of Nephrology, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.
Journal of Neurotrauma
|December 9, 2009
Summary
Traumatic brain injury (TBI) disrupts polyamine homeostasis, increasing catabolism and toxic metabolites. This study found elevated polyamine catabolic enzymes and altered polyamine levels in rats after TBI, suggesting therapeutic targets.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Polyamines (spermine, spermidine) are crucial for DNA stability, immune function, and antioxidant defense.
- Disrupted polyamine homeostasis and toxic metabolite generation contribute to secondary brain injuries after trauma.
- Traumatic brain injury (TBI) models show altered polyamine metabolism.
Purpose of the Study:
- To investigate the hypothesis that brain polyamine catabolism increases following traumatic brain injury (TBI).
- To determine changes in polyamine catabolic enzyme expression and polyamine levels in a rat model of TBI.
Main Methods:
- Lateral controlled cortical impact TBI model in rats.
- Quantification of SSAT (Spermidine/spermine-N(1)-acetyltransferase) and SMO (Spermine oxidase) mRNA and protein expression.
- Measurement of spermine, spermidine, and putrescine levels via HPLC.
- Immunohistochemistry to localize enzyme expression.
Main Results:
- SSAT mRNA increased 6-24h post-TBI; SMO mRNA increased 3-7 days post-TBI, primarily in the ipsilateral hemisphere.
- Putrescine levels increased significantly (up to sixfold) from 6-72h post-TBI.
- Spermidine levels decreased acutely and increased by 72h; spermine levels showed transient decreases.
- Increased SSAT protein expression observed in neuronal and glial cells ipsilateral to the injury.
Conclusions:
- TBI induces a sustained increase in brain polyamine catabolism, leading to disrupted polyamine homeostasis.
- Elevated polyamine catabolism and associated metabolites may contribute to secondary injury progression.
- Targeting polyamine metabolism (e.g., supplementation or oxidation inhibition) presents potential therapeutic strategies for TBI.
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