Related Experiment Video

Updated: Jun 27, 2026

Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
10:59

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

Published on: November 19, 2012

Traumatic brain injury alters expression of hippocampal microRNAs: potential regulators of multiple

John B Redell1, Yin Liu, Pramod K Dash

  • 1Department of Neurobiology and Anatomy, The University of Texas Medical School, Houston, Texas 77225, USA.

Journal of Neuroscience Research
|November 21, 2008
PubMed

Insights

Traumatic brain injury (TBI) alters microRNA (miRNA) expression in the hippocampus. These changes in miRNA levels suggest they play a role in regulating cellular processes critical to TBI pathophysiology.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Traumatic brain injury (TBI) involves complex cellular and molecular changes impacting patient outcomes.
  • MicroRNAs (miRNAs) are key regulators of cellular processes like proliferation, apoptosis, and neurogenesis, which are relevant to TBI.
  • The specific alterations in miRNA expression following TBI remain largely uncharacterized.

Purpose of the Study:

  • To investigate changes in hippocampal miRNA expression levels at early time points after controlled cortical impact injury (CCI) in rodents.
  • To identify specific miRNAs that are upregulated or downregulated following TBI.
  • To explore the potential biological functions and pathways targeted by these altered miRNAs.

Main Methods:

  • Utilized a microarray platform to screen expression levels of 444 rodent miRNAs in the hippocampus at 3 and 24 hours post-TBI.
  • Validated microarray findings for a selected panel of miRNAs using quantitative polymerase chain reaction (qPCR).
  • Performed bioinformatic analysis on predicted miRNA targets to identify overrepresented biological processes and functions.

Main Results:

  • Identified significant changes in the expression of 85 miRNAs in the hippocampus 3 and 24 hours after TBI.
  • Specifically, 50 miRNAs showed decreased expression, while 35 miRNAs exhibited increased expression post-injury.
  • qPCR confirmed altered expression levels for miRNAs including miR-107, -130a, -223, -292-5p, -433-3p, -451, -541, and -711.
  • Bioinformatic analysis revealed that predicted targets of these miRNAs are involved in crucial injury-related processes such as signal transduction, transcriptional regulation, proliferation, and differentiation.

Conclusions:

  • MicroRNA expression profiles are significantly altered in the hippocampus following experimental TBI.
  • The identified miRNAs and their predicted targets suggest a regulatory role for miRNAs in key pathophysiological processes initiated by TBI.
  • These findings highlight miRNAs as potential therapeutic targets for mitigating TBI-induced damage.

More Related Videos

Stereotactic Atlas-Guided Laser Capture Microdissection of Brain Regions Affected by Traumatic Injury09:29

Stereotactic Atlas-Guided Laser Capture Microdissection of Brain Regions Affected by Traumatic Injury

Published on: September 11, 2017

Controlled Cortical Impact Model for Traumatic Brain Injury05:30

Controlled Cortical Impact Model for Traumatic Brain Injury

Published on: August 5, 2014

Related Concept Videos

Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
Traumatic Brain Injury l: Introduction01:28

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...