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Expression of spinal cord microRNAs in a rat model of chronic neuropathic pain
Timo Brandenburger1, Mirco Castoldi, Maike Brendel
1Department of Anesthesiology, University Hospital Düsseldorf, Moorenstr.5, 40225 Düsseldorf, Germany. timo.brandenburger@med.uni-duesseldorf.de
Abstract:
Neuropathic pain is accompanied by significant alterations of gene expression patterns in the somatosensory nervous system. The spinal cord is particularly prone to neuroplastic changes. Since the expression of microRNAs (miRNAs) has been linked to numerous pathophysiological processes, a contribution of miRNAs to the maladaptive plasticity of the spinal cord in neuropathic pain is possible. Aim of the present study therefore was to characterize the specific expression pattern of miRNAs in the rat spinal cord. Furthermore, we evaluated the time-dependent changes in expression patterns of spinal miRNAs in the chronic constriction injury (CCI) model of neuropathic pain in rats. Results from miRNA microarrays revealed a distinct expression pattern of miRNAs in the rat spinal cord. MiRNAs-494, -720, -690 and -668 showed the highest signal intensities. Members of the let-7 family as well as miR-124 belong to the group of the most highly expressed miRNAs. Induction of neuropathic pain by CCI did not lead to relevant differences in spinal miRNA expression levels compared to sham-operated animals at any studied time point. Therefore, modulation of miRNAs does not seem to contribute significantly to the changes in gene expression that cause neural plasticity in the spinal cord in this model of chronic neuropathic pain.
Insights
This study investigated microRNA (miRNA) expression in rat spinal cords during neuropathic pain. Results indicate that spinal miRNA expression patterns do not significantly change following chronic constriction injury, suggesting miRNAs are not major drivers of pain-related neural plasticity.
Area of Science:
- Neuroscience
- Molecular Biology
- Pain Research
Background:
- Neuropathic pain involves gene expression changes in the somatosensory nervous system.
- The spinal cord is susceptible to neuroplastic changes.
- MicroRNAs (miRNAs) are implicated in various pathophysiological processes.
Purpose of the Study:
- To characterize miRNA expression patterns in the rat spinal cord.
- To evaluate time-dependent changes in spinal miRNA expression during neuropathic pain.
Main Methods:
- Utilized miRNA microarrays to analyze gene expression.
- Employed the chronic constriction injury (CCI) model in rats.
- Compared miRNA expression between CCI and sham-operated groups at multiple time points.
Main Results:
- Identified a distinct miRNA expression profile in the rat spinal cord.
- MiRNAs -494, -720, -690, -668, let-7 family members, and miR-124 were highly expressed.
- No significant differences in spinal miRNA levels were observed between neuropathic pain and sham groups.
Conclusions:
- Spinal miRNA expression patterns are distinct but do not significantly change with CCI-induced neuropathic pain.
- MiRNA modulation appears to play a limited role in the gene expression changes underlying spinal neural plasticity in this pain model.
