[Study on expression of mkp-1 and P-ERK in acutecontusive spinal cord injury rat's model]

To observe the expression of mitogen activated protein kinase phosphatase-1 (MKP-1) and phosphorylation of extracellular signal-regulated kinases (P-ERK) of spinal cord in acute contusive spinal cord injury model, 20 Sprague Dawley rats were divided into two groups at random, Ten rats' spinal cord contusive injuries were produced by using modified Allen's method (using a weight-drop device) after the T10 spinous process and the corresponding vertebral lamina were removed as experimental group. The rest 10 rats received only T10 laminectomies and didn't injury the spinal cord as Sham-operated control group. The injury spinal cord was carried out respectively in two groups at 12h after injury. Pathological alterations were detected by H-E stain. The expression of MKP-1 and P-ERK were analyzed by immunohistochemistry and Western blot analysis. In Sham-operated control group, the micro structure of spinal cord was normal. The pathological alterations were very apparent in the damaged spinal cord area in the experiment group. We also found MKP-1 expression of spinal cord was decreased while P-ERK was increased in experimental group when compared with Sham-operated control group (P<0.01). The results suggested that acute contusive spinal cord injury down-regulated the expression of MKP-1 and up-regulated the PERK, which might play a role in the pathophysiological of spinal cord injury.