[Screen and identification of the relative protein expressed in the acute tractive spinal cord injury in rats].

Objective: To screen and identify the relative protein expressed in the acute tractive spinal cord injury (TSCI) in rats.

Methods: Ten adult Sprague Dawley rats were randomly divided into Sham group and TSCI group, 5 rats in each group. Rats from Sham group and TSCI group at 1 day after surgery were sacrificed for harvesting T₁₃-L₂ spinal tissue specimens. The extraction and quantitation of protein in the spinal tissue was finished firstly. Proteins from spinal tissue were separated by two-dimensional electrophoresis (2-DE) and identified by mass spectrometry (MS). The different expression map was established in each group, and proteins express differently was determined by comparing the level of each spot with gel imaging software and manually. Proteins were identified by High performance liquid chromatography-electrospray tandem (NanoUPLC-ESI-MS/MS) and peptide sequence tag with tandem MS combining with database respectively. After that, the function of these identified proteins was known and classified.

Results: There were 22 differential protein expression spots were found between Sham group and TSCI group. Among them, 18 spots were up-regulated and 4 were down-regulated. 4 differential protein expression spots were newly found in TSCI group. Sixteen significant proteins were identified by NanoUPLC-ESI-MS/MS. Four kind of proteins were related to apoptosis, 3 in nerve signal transduction and 6 in metabolism, respectively. Unnamed proteins were 3.

Conclusions: The differential expression proteins were found between Sham group and TSCI group. These identified proteins may play important role in the process of injury and recovery through transduction nerve signal, regulating nerve cells apoptosis and metabolism.