RÉSUMÉ
Objective To investigate the relationship between the matrix metalloproteinase-3(MMP-3)and the stability of carotid artery plaque,and explore MMP-3's prediction role on the attack and relapse of acute ischemic cerebrovascular events.Methods 100 patients with the first ever acute cerebral infarction,100 patients with chronic cerebral circulation insufficiency(CCCI)and 40 persons without cerebrovascular diseases were enrolled in this study.According to the carotid ultrasound examination,100 cerebral infarction patients were divided into three subgroup: unstable plaque group(45 patients,mixed plaque,soft plaque),stable plaque group(35 patients,plaque Group)and endometrial coarse group(25patients).Matrix metalloproteinase-3(MMP-3)levels of all the subjects were measured by enzyme-linked immunosorbent assay(as basal level).All the subjects were followed up for one year to observe cerebral infarction events.Serum MMP-3 levels of each group,and the basic serum MMP-3 levels were compared among patients who were attacked or relapsed cerebral ischemic with those who had not been attack cerebral ischemic during this period of time.Results 5 patients in the cerebral infarction group had relapse (5%),2 patients in the CCCI group were attacked by cerebral ischemic(2%),and no one in the normal control group was attacked by cerebral ischemic.Serum MMP-3 levels in the acute cerebral infarction group were significantly higher than CCCI group,and both groups were significantly higher than normal control group (P ＜0.05).The basic serum MMP-3 levels in all patients who were attacked by cerebral ischemic were significantly higher than those who had not been attack by cerebral ischemic during this period of time(P ＜0.05).The serum MMP-3 levels of the unstable plaque group were significantly higher than stable plaque group.And both groups were significantly higher than endometrial coarse group(P ＜0.05).Conclusions Elevated levels of matrix metalloproteinase-3(MMP-3)might have something with the stability of carotid atherosclerotic plaque,and participate the attack and the relapse of acute cerebral infarction.Determination of MMP-3 might be used to predict the attack and relapse of acute cerebral infarction.
RÉSUMÉ
Objective To investigate whether iron mass induces HO-1 overexpression and explore the role of HO-1 in rat intracerebral hemorrhage(ICH). Methods In this study,144 hydrated chloride aldehyde-anesthetized Sprague- Dawley rats were used,autologous blood were injected into the right caudate nucleus to establish the ICH model.Saline injection and health were served as controls.Deferoxamine(DFO)with an intraperitoneal injection served as intervention group.Enhanced Perl's reaction was used for iron staining and brain iron deposits were determined.Brain HO-1 level were examined by immunohistochemical analysis and reverse transcription polymerase chain reaction(RT-PCR). Results There was a 21-fold increase in iron deposits around the hematoma 7 days after the infusion of 100 μl of autologous blood.Markedly increased levels of perihematomal HO-1 immunoreactivity and HO-1 mRNA in all ICH rats were detected at 3-14 days.The addition of DFO significantly reduced iron deposits in the ipsilateral basal ganglia at 7-14 days after ICH.DFO also inhibited HO-1 overexpression at day 7,14.Correlations test showed that there were positive correlations of iron sediments with HO-1mRNA(r=0.647)and HO-1 immunopositive cells(r=0.209). Conclusions ICH causes iron accumulation in the brain.Iron overloading may induce HO-1 upregulation after ICH.Ratherly,the HO-1 moderate increasing possibly fits with the events,whereas HO-1 overexpression may result in its dysfunction.It may be prudent to intervene ICH with HO-1 inhibitor.