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A Neurosphere Assay to Evaluate Endogenous Neural Stem Cell Activation in a Mouse Model of Minimal Spinal Cord Injury
Published on: September 13, 2018
MicroRNAs in Spinal Cord Injury: Molecular and Translational Insights
Seyyedeh Fahimeh Talebi1, Hossein Kalarestaghi2, Ehsan Sheikh Hesabi3
1Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Background:
Spinal cord injury (SCI) is characterized by complex molecular and cellular disturbances that contribute to progressive tissue damage and neurological dysfunction. Among the regulatory mechanisms implicated, microRNAs (miRNAs), which are small noncoding RNAs that regulate gene expression posttranscriptionally, have emerged as central components of several injury-related pathways. This review synthesizes current knowledge regarding the regulatory functions of miRNAs and evaluates their potential as therapeutic targets.
Method:
Recent experimental and preclinical studies were analyzed to identify key miRNAs associated with injury-induced molecular responses and to assess advances in miRNA-based therapeutic strategies, including the use of miRNA mimics, inhibitors, and delivery systems.
Results:
Several miRNAs, including miR-21, miR-223, miR-124, and miR-219, can regulate essential biological processes such as apoptosis, neuroinflammation, oxidative stress, glial activation, and remyelination. miR-21 and miR-223 exhibited context-dependent roles in neuroinflammation, apoptosis, and vascular repair, while miR-124 could modulate microglial activity and miR-219 facilitates oligodendrocyte differentiation and myelin restoration. Experimental therapeutic approaches employing viral vectors, nanoparticles, stem cell-based delivery, and exosome systems have resulted in enhanced tissue preservation, angiogenesis, and functional outcomes in preclinical models.
Conclusion:
miRNAs serve as critical molecular regulators and represent promising therapeutic targets. Nevertheless, clinical translation is constrained by challenges such as delivery barriers, off-target effects, and the complexity of miRNA-mediated regulatory networks. Advances in delivery technologies and research focused on precise miRNA regulation may support the development of effective neuroprotective and regenerative therapies.
Insights
MicroRNAs (miRNAs) are key regulators in spinal cord injury (SCI) pathways, influencing processes like inflammation and remyelination. Therapeutic strategies using miRNAs show promise but face delivery and specificity challenges for clinical use.
Area of Science:
- Neuroscience
- Molecular Biology
- Regenerative Medicine
Background:
- Spinal cord injury (SCI) involves complex molecular and cellular changes leading to progressive damage and dysfunction.
- MicroRNAs (miRNAs), small noncoding RNAs regulating gene expression, are central to injury-related pathways.
- Understanding miRNA roles is crucial for developing effective SCI therapies.
Purpose of the Study:
- To review the regulatory functions of miRNAs in spinal cord injury.
- To evaluate the potential of miRNAs as therapeutic targets for SCI.
- To synthesize current knowledge on miRNA-based therapeutic strategies.
Main Methods:
- Analysis of recent experimental and preclinical studies on SCI.
- Identification of key miRNAs involved in injury-induced molecular responses.
- Assessment of advancements in miRNA-based therapeutic strategies, including mimics, inhibitors, and delivery systems.
Main Results:
- Specific miRNAs (e.g., miR-21, miR-124, miR-219) regulate apoptosis, neuroinflammation, oxidative stress, glial activation, and remyelination.
- miRNAs like miR-21 and miR-223 have context-dependent roles in neuroinflammation and vascular repair.
- Therapeutic approaches using viral vectors, nanoparticles, and stem cells improved tissue preservation and functional outcomes in preclinical models.
Conclusions:
- miRNAs are critical regulators and promising therapeutic targets for SCI.
- Clinical translation is hindered by delivery barriers, off-target effects, and network complexity.
- Advancements in delivery technologies and precise miRNA regulation are essential for effective neuroprotection and regeneration.
