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Traumatic Brain Injury l: Introduction

Traumatic Brain Injury l: Introduction

DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...

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Updated: May 2, 2026

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury

Published on: November 19, 2012

Impaired cortical mitochondrial function following TBI precedes behavioral changes.

William D Watson¹, John E Buonora¹, Angela M Yarnell²

¹Department of Neurology, Uniformed Services University of the Health Sciences Bethesda, MD, USA.

Frontiers in Neuroenergetics

|February 20, 2014

Summary

This summary is machine-generated.

Traumatic brain injury (TBI) causes mitochondrial dysfunction in the cortex within 7 days, preceding memory impairment. While respiration recovers by 17 days, cortical mitochondrial membrane potential remains impaired, potentially affecting other functions.

Keywords:

animal behavior energy metabolism mitochondria oxidative phosphorylation traumatic brain injury

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Published on: January 20, 2023

Area of Science:

Neuroscience
Cellular Biology
Biochemistry

Background:

Traumatic brain injury (TBI) involves primary physical damage and secondary injury cascades.
Secondary injury mechanisms, which are delayed and prolonged, are key therapeutic targets.
Mitochondrial dysfunction is implicated in TBI pathophysiology.

Purpose of the Study:

To investigate the temporal effects of controlled cortical impact (CCI) on mitochondrial function in rat brain.
To correlate mitochondrial changes with behavioral deficits after TBI.

Main Methods:

Adult male rats underwent CCI to induce TBI.
Mitochondrial function (oxygen consumption, respiratory control ratio, membrane potential) was assessed in cortical and hippocampal tissues at 7 and 17 days post-injury.
NADH oxidase activity and passive avoidance memory tests were performed.

Main Results:

Cortical mitochondria showed significantly decreased oxygen consumption, respiratory control ratio, and membrane potential at 7 days post-TBI.
Hippocampal mitochondria exhibited only minor, non-significant decreases.
While respiratory and phosphorylation capacities recovered by 17 days, cortical mitochondrial membrane potential remained diminished.
Memory impairment was observed at 17 days post-injury, coinciding with persistent mitochondrial membrane potential deficits.

Conclusions:

Controlled cortical impact induces significant cortical mitochondrial dysfunction by 7 days post-injury.
This mitochondrial dysfunction precedes the onset of behavioral deficits observed at 17 days.
Persistent cortical mitochondrial membrane potential deficits at 17 days may impact non-ATP synthesis functions, despite recovery of oxidative phosphorylation.