[Expression of matrix metalloproteinase-3 after brain contusion in rats].

OBJECTIVE

To investigate the expression of matrix metalloproteinase-3 after brain contusion and its applicability for estimating the age of brain contusion.

METHODS

Rats had been divided into three groups: control group, sham operation group and brain contusion group. The expression of matrix metalloproteinase-3 at different time was detected by immunohistochemistry and Western blot.

RESULTS

By the immunohistochemistry, no staining was observed in control and sham operation groups. The positive staining of MMP-3 appeared 6 hours after contusion, increased gradually in 24 hours and peaked 5 days after contusion, then started to decrease, 14 days after contusion still could be observed. By the Western blot analysis, no expression of MMP-3 was detected in control and sham groups. The positive staining of MMP-3 appeared 6 hours after contusion, increased gradually and maximized 5 days after contusion, then started to decrease, 14 days after contusion still could be found.

CONCLUSION

Time-order expression of MMP-3 could be used for estimating the age of brain contusion in forensic pathology.