Related Experiment Video
Updated: Jun 17, 2026
Neural Stem Cell Transplantation in Experimental Contusive Model of Spinal Cord Injury
Published on: December 17, 2014
Involvement of ERK2 in traumatic spinal cord injury
Chen-Guang Yu1, Robert P Yezierski, Aashish Joshi
1Spinal Cord and Brain Injury Research Center and Department of Anatomy and Neurobiology, University of Kentucky College of Medicine, Lexington, Kentucky 40536-0509, USA. cyu4@uky.edu
Abstract:
Activation of extracellular signal-regulated protein kinase 1/2 (ERK1/2) are implicated in the pathophysiology of spinal cord injury (SCI). However, the specific functions of individual ERK isoforms in neurodegeneration are largely unknown. We investigated the hypothesis that ERK2 activation may contribute to pathological and functional deficits following SCI and that ERK2 knockdown using RNA interference may provide a novel therapeutic strategy for SCI. Lentiviral ERK2 shRNA and siRNA were utilized to knockdown ERK2 expression in the spinal cord following SCI. Pre-injury intrathecal administration of ERK2 siRNA significantly reduced excitotoxic injury-induced activation of ERK2 (p < 0.001) and caspase 3 (p < 0.01) in spinal cord. Intraspinal administration of lentiviral ERK2 shRNA significantly reduced ERK2 expression in the spinal cord (p < 0.05), but did not alter ERK1 expression. Administration of the lentiviral ERK2 shRNA vector 1 week prior to severe spinal cord contusion injury resulted in a significant improvement in locomotor function (p < 0.05), total tissue sparing (p < 0.05), white matter sparing (p < 0.05), and gray matter sparing (p < 0.05) 6 weeks following severe contusive SCI. Our results suggest that ERK2 signaling is a novel target associated with the deleterious consequences of spinal injury.
Insights
Targeting ERK2 signaling after spinal cord injury (SCI) shows promise. Reducing ERK2 expression improved functional recovery and tissue sparing in SCI models, suggesting ERK2 as a therapeutic target.
Area of Science:
- Neuroscience
- Molecular Biology
- Regenerative Medicine
Background:
- Extracellular signal-regulated protein kinase 1/2 (ERK1/2) activation is linked to spinal cord injury (SCI) pathophysiology.
- The distinct roles of individual ERK isoforms, particularly ERK2, in SCI-induced neurodegeneration remain unclear.
- Understanding ERK2's specific contribution is crucial for developing targeted therapeutic strategies for SCI.
Purpose of the Study:
- To investigate the hypothesis that ERK2 activation exacerbates pathological and functional deficits following SCI.
- To evaluate the potential of ERK2 knockdown via RNA interference as a therapeutic approach for SCI.
- To assess the impact of reducing ERK2 expression on neuroprotection and functional recovery post-SCI.
Main Methods:
- Utilized lentiviral ERK2 shRNA and small interfering RNA (siRNA) for targeted ERK2 knockdown in the spinal cord.
- Administered ERK2 siRNA intrathecally pre-injury to assess its effect on excitotoxic injury markers.
- Administered lentiviral ERK2 shRNA intraspinally pre-injury to evaluate its impact on ERK2 expression and functional outcomes after contusive SCI.
Main Results:
- Pre-injury intrathecal ERK2 siRNA significantly reduced ERK2 and caspase 3 activation following excitotoxic injury.
- Intraspinal lentiviral ERK2 shRNA significantly decreased ERK2 expression without affecting ERK1 levels.
- Administration of lentiviral ERK2 shRNA one week prior to severe contusion injury led to significant improvements in locomotor function, total tissue sparing, white matter sparing, and gray matter sparing six weeks post-injury.
Conclusions:
- ERK2 signaling plays a significant role in the pathological consequences of spinal cord injury.
- Targeted knockdown of ERK2 demonstrates a promising therapeutic strategy for mitigating SCI-induced damage.
- ERK2 represents a novel therapeutic target for improving outcomes following spinal cord injury.
Related Concept Videos
01:25Secondary Spinal Cord Injury llI: Pathophysiology
01:14Spinal Cord Injury ll: Pathophysiology