机构：[1]Department of Neurosurgery, China International Neuroscience Institute,Xuanwu Hospital, Capital Medical University, 45 Changchu Street, Beijing 100053, China.神经科系统神经外科[2]Cell Therapy Center, Xuanwu Hospital, Capital Medical University, Beijing, China.细胞生物学研究室[3]Research Center of Spine and Spinal Cord, Beijing Institute for Brain Disorders, Capital Medical University, Beijing, China.
Syringomyelia is a common spinal cord lesion. However, whether CSF blockage is linked to the formation and enlargement of syringomyelia is still controversial. The current model of syringomyelia needs modification to more closely mimic the clinical situation.
We placed cotton strips under the T13 lamina of 40 8-week-old rats and blocked CSF flow by extradural compression. After 4 and 8 weeks, MRI was performed to evaluate the morphology of syringomyelia and the ratio of spinal cord diameter to syrinx diameter calculated. Locomotor function was evaluated weekly. Spinal cord sections, staining and immunohistochemistry were performed 8 weeks after surgery, the ratio of the central canal to the spinal cord area was calculated, and ependymal cells were counted. In another experiment, we performed decompression surgery for 8 rats with induced syringomyelia at the 8th week after surgery. During the surgery, the cotton strip was completely removed without damaging the dura mater. Then, the rats received MRI imaging during the following weeks and were sacrificed for pathological examination at the end of the experiment.
Syringomyelia formed in 82.5% (33/40) of rats at the 8-week follow-up. The Basso, Beattie and Bresnahan (BBB) scores of rats in the experimental group decreased from 21.0±0.0 to 18.0 ±3.9 in the first week after operation but returned to normal in later weeks. The BBB score indicated that the locomotor deficit caused by compression is temporary and can spontaneously recover. MRI showed that the syrinx is located in the center of the spinal cord, which is very similar to the most common syringomyelia in humans. The ratio of the central canal to the spinal cord area reached (2.9 ± 2.0) × 10-2, while that of the sham group was (5.4 ± 1.5) × 10-4. The number of ependymal cells lining the central canal was significantly increased (101.9 ± 39.6 vs 54.5 ± 3.4). There was no syrinx or proliferative inflammatory cells in the spinal cord parenchyma. After decompression, the syringomyelia size decreased in 50% (4/8) of the rats and increased in another 50% (4/8).
Extradural blockade of CSF flow can induce syringomyelia in rats. Temporary locomotor deficit occurred in some rats. This reproducible rat model of syringomyelia, which mimics syringomyelia in humans, can provide a good model for the study of disease mechanisms and therapies.
第一作者机构：[1]Department of Neurosurgery, China International Neuroscience Institute,Xuanwu Hospital, Capital Medical University, 45 Changchu Street, Beijing 100053, China.
通讯作者：
通讯机构：[1]Department of Neurosurgery, China International Neuroscience Institute,Xuanwu Hospital, Capital Medical University, 45 Changchu Street, Beijing 100053, China.[3]Research Center of Spine and Spinal Cord, Beijing Institute for Brain Disorders, Capital Medical University, Beijing, China.
推荐引用方式(GB/T 7714)：
Ma Longbing,Yao Qingyu,Zhang Can,et al.Chronic extradural compression of spinal cord leads to syringomyelia in rat model.[J].FLUIDS AND BARRIERS OF THE CNS.2020,17(1):doi:10.1186/s12987-020-00213-4.
APA：
Ma Longbing,Yao Qingyu,Zhang Can,Li Mo,Cheng Lei&Jian Fengzeng.(2020).Chronic extradural compression of spinal cord leads to syringomyelia in rat model..FLUIDS AND BARRIERS OF THE CNS,17,(1)
MLA：
Ma Longbing,et al."Chronic extradural compression of spinal cord leads to syringomyelia in rat model.".FLUIDS AND BARRIERS OF THE CNS 17..1(2020)
