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Published on: July 20, 2011
[Impacts of high-dose methylprednisolone on gene expression profiling in acute spinal cord injury]
Ying Huang1, Hui Wang, Chunqiang Zhang
1Department of Hematology, the First Affiliated Hospital of Kunming Medical College, Kunming Yunnan, 650032, P.R.China.
Objective:
Methylprednisolone (MP) is the only active drug for acute spinal cord injury (SCI), but the molecular mechanism is still further studied. To investigate the pathophysiology of SCI and the molecular mechanism of MP in treating SCI.
Methods:
Nine rabbits were randomly divided into 3 groups, weighing (3 100 +/- 140) g: sham operation group (group A, n = 3), model group (group B, n = 3), and drug treatment group (group C, n = 3). After laminectomy was performed in 3 groups, no treatment was given in group A, and the model of SCI was established with modified Allen's falling strike method in groups B and C at L4; then high-dose MP equivalent with human dose was adopted in group C at 2 hours after SCI and the normal saline in group B. All rabbits were sacrificed at 8 hours after SCI, and then the spinal cord tissues about 8 mm long which included the injured site were obtained. Total RNA was isolated with Trizol one-step method to examine the gene expression profile by using Oglio technologies with standard operating procedures and quality control as recently described respectively. GeneSpring11.0 analyzer software was used to filter potential candidate genes for statistical significance using Welch's t test, and only genes with P < 0.05 and fold change (FC) > or = 2 were retained for further analysis. Some differentially expressed genes were also verified by RT-PCR to ensure the reliability of microarray results.
Results:
The SCI model was set up and the samples of spinal cord tissues were acquired successfully at 8 hours after SCI. The qualify of total RNA from each group met the requirement for the microarray examination and data analysis. These differentially expressed genes involved inflammation, immunity, ion transportation, transcription factors, and so on. The results of genes IL-1alpha, IL-1beta, and defensin 4 (NP-4) by RT-PCR were consistent with that of gene-chips. The immuno-related genes included NP-3, NP-4, corticostatin 6, CAP-18, and antimicrobial peptide, which displayed obvious differential expression.
Conclusion:
High-dose MP has protective effects on nervous function by the immunity mechanism, and the main effector may be neutrophil.
Insights
Methylprednisolone (MP) protects spinal cord injury (SCI) by modulating immune responses, primarily involving neutrophils. This study investigated the molecular mechanisms behind SCI and MP
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Context:
- Acute spinal cord injury (SCI) remains a critical condition with limited therapeutic options.
- Methylprednisolone (MP) is the sole active drug for SCI, yet its precise molecular mechanisms require further elucidation.
- Understanding SCI pathophysiology is crucial for developing effective treatments.
Purpose:
- To investigate the molecular mechanisms underlying spinal cord injury (SCI).
- To explore the molecular mechanisms of methylprednisolone (MP) in treating SCI.
- To identify differentially expressed genes in response to SCI and MP treatment.
Summary:
- A rabbit model of SCI was established and treated with methylprednisolone (MP) or saline.
- Gene expression profiling identified significant differences in immune-related genes, including defensin 4 (NP-4), between groups.
- RT-PCR confirmed the differential expression of key genes like IL-1alpha, IL-1beta, and NP-4.
Impact:
- High-dose MP demonstrates neuroprotective effects through immune modulation in SCI.
- Neutrophils are identified as potential key effectors in MP's therapeutic action.
- This research provides insights into the molecular basis of MP's efficacy in SCI treatment.
