[Changes in plasma content of matrix metallo proteinase-9 in acute cerebral infarction patients before and after thrombolytic therapy and its significance].
OBJECTIVE
To investigate the changes in the content of plasma matrix metallo proteinase-9 (MMP-9) in patients with acute cerebral infarction before and after thrombolytic therapy and its clinical significance.


METHODS
The levels of MMP-9 were determined in 34 patients with acute cerebral infarction before and after thrombolytic therapy, and 34 healthy individuals served as healthy control.


RESULTS
Compared with the healthy controls, the levels of plasma MMP-9 before thrombolytic therapy were not significantly increased [(13.47±3.09) ng/L vs. (12.89±10.22) ng/L, P >0.05]. In contrast, MMP-9 values were significantly increased after thrombolytic therapy [(22.06±12.53) ng/L] compared with that in either before or healthy control group (both P<0.05). MMP-9 values were significantly higher in patients with hemorrhage after thrombolytic therapy (incidence rate was 26.5%, 9/34) compared with before treatment [(24.02±15.41) ng/L vs. (14.28±2.33) ng/L, P<0.05], and the values of MMP-9 were higher than those of patients without hemorrhage [(20.42±9.57) ng/L], but there was no statistically significant difference ( P >0.05). In patients with complete revascularization (revascularization rate was 58.8%, 20/34), MMP-9 level was markedly higher than before thrombolytic therapy after thrombolytic therapy [(19.26±7.94) ng/L vs. (13.63±3.02) ng/L, P<0.05], and the values of MMP-9 were higher than the no-revascularization patients [(18.97±4.23) ng/L], but there was no statistically significant difference ( P >0.05).


CONCLUSIONS
Thrombolytic therapy activated MMP-9, and MMP-9 increased the risk of hemorrhage after thrombolytic therapy, and it participated in the mechanisms of hemorrhagic tendency after thrombolysis.
Wang
Peng-Jun
PJ
Department of Neurology, the Fourth Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang, China. wangpj73@163.com
Song
Rong-Rong
RR
Zhang
Zhuo-Bo
ZB
Shen
Dong-Fang
DF
D000208:Acute Disease; D000368:Aged; D016022:Case-Control Studies; D002544:Cerebral Infarction / Q000097:blood* / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D020780:Matrix Metalloproteinase 9 / Q000097:blood*; D008875:Middle Aged; D015912:Thrombolytic Therapy
D020780:Matrix Metalloproteinase 9