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Effect of methylprednisolone on motor function and spinal cord blood flow after spinal cord compression in rats
Abstract:
The effect of methylprednisolone (MP) on neurologic recovery and spinal cord blood flow (SCBF) was investigated up to 4 days after a spinal cord compression injury in rats. The injury was produced at midthoracic level by applying a load of 35 g on a 2.2 x 5.0 mm compression plate for 5 min, which resulted in transient paraparesis. MP was given as a bolus dose of 30 mg/kg i.v. 60 min after injury (n = 20) and controls were given saline (n = 10). The motor performance was assessed daily as the capacity angle on the inclined plane and SCBF was measured by 14C-iodoantipyrine autoradiography on Days 1 or 4. On Day 1 the capacity angle was reduced from about 63 degrees preoperatively to 33 +/- 2 degrees (mean +/- SEM) in the control group and to 50 +/- 1 degrees in the group treated with MP (p less than 0.05). Thereafter there was a slight improvement in both groups, but the difference persisted throughout the observation period. On Day 4 both gray and white matter SCBF was better preserved in MP-treated animals than in the control group (59 +/- 4 versus 49 +/- 3 ml/min/100 g tissue for gray matter and 13.6 +/- 0.6 versus 10.7 +/- 0.8 ml/min/100 g tissue for white matter). Posttraumatic treatment with MP, thus, improved both the neurologic recovery during the first 4 days and SCBF as measured on Day 4. It is speculated that the effect of MP is at least partly exerted on the vascular bed.
Insights
Methylprednisolone (MP) treatment improved neurologic recovery and spinal cord blood flow (SCBF) in rats after injury. This steroid therapy enhanced motor function and preserved blood flow in gray and white matter tissue.
Area of Science:
- Neuroscience
- Pharmacology
- Regenerative Medicine
Background:
- Spinal cord injury (SCI) leads to significant neurologic deficits.
- Methylprednisolone (MP) is a corticosteroid with anti-inflammatory properties.
- Understanding MP's effects on recovery and spinal cord blood flow (SCBF) is crucial.
Purpose of the Study:
- To investigate the impact of methylprednisolone (MP) on neurologic recovery.
- To assess the effect of MP on spinal cord blood flow (SCBF) following compression injury.
- To evaluate MP's efficacy in a rat model of transient spinal cord compression.
Main Methods:
- Spinal cord compression injury induced in rats using a calibrated load.
- Administration of methylprednisolone (MP) or saline control intravenously 60 minutes post-injury.
- Assessment of motor performance using the inclined plane test (capacity angle).
- Measurement of spinal cord blood flow (SCBF) using 14C-iodoantipyrine autoradiography.
Main Results:
- MP treatment significantly improved motor performance (capacity angle) on Day 1 post-injury compared to controls.
- Neurologic recovery differences between MP-treated and control groups persisted throughout the 4-day observation period.
- MP administration led to better preservation of SCBF in both gray and white matter on Day 4 post-injury.
Conclusions:
- Post-traumatic methylprednisolone (MP) treatment enhances neurologic recovery in the early phase after spinal cord compression injury.
- MP improves spinal cord blood flow (SCBF), suggesting a beneficial effect on the vascular bed.
- These findings support the therapeutic potential of MP in managing acute spinal cord injuries.