Microhemorrhage identified on 3.0 T MR susceptibility-weighted imaging for prognosis of viral encephalitis.

OBJECTIVE: To evaluate the relationship of microhemorrhage on susceptibility-weighted imaging (SWI) with the severity of clinical symptoms and the prognosis of viral encephalitis. MATERIALS AND METHODS: Thirty patients with clinically diagnosed viral encephalitis were divided into three groups according to the Glasgow Coma Scale (GCS) and the condition of recovery namely, Group I (n = 12): Glasgow Coma Scale (GCS)≥13 and recovered with no sequelae; Group II (n = 11): GCS 9-12 and recovered with some sequelae; Group III (n = 7): GCS 3-8 and recovered with more severe sequelae. The microhemorrhage detectability on SWI and conventional MR imaging in these three groups was compared and their correlations with different seriousness of clinical symptoms and prognosis were analyzed. RESULTS: There was a significant difference in microhemorrhage volume among different MR sequences (p < 0.05). SWI was more sensitive to detect microhemorrhage than conventional MR imaging techniques. Microhemorrhages on SWI were significantly different among the three groups (p < 0.01). The volume of microhemorrhage on SWI was well correlated with the degree of clinical symptoms and the prognosis of viral encephalitis. CONCLUSION: SWI can be used to detect microhemorrhage in patients with viral encephalitis. Assessment of microhemorrhage with SWI can provide useful information for the prognosis evaluation of viral encephalitis.

[The Study of Methylated Regulation MicroRNA in Pancreatic Carcinoma Cell and Its Effect on Cell Proliferation,Migration and Invasion].

OBJECTIVE: To study the epigenetic regulation of pancreatic carcinoma related microRNA (miR34a,miR34b,miR148a and miR203a) expression by gene promoter methylation,and its effect on the proliferation,migration and invasion of pancreatic carcinoma cells. METHODS: The pancreatic carcinoma cells were divided into two groups:control group and treatment group.Control group was treated with 0 µmol/L DNA methyltransferase inhibitor 5-Aza-CdR and treatment group was treated with 60 µmol/L 5-Aza-CdR. The methylation status of microRNA gene promoter regions was detected by MSP (methylation-specific PCR). The microRNAs' expression levels were evaluated by real-time PCR. The CCK-8 assay,wound healing assay and Transwell assay were employed to study the proliferation,migration and invasion of pancreatic carcinoma cells,respectively. RESULTS: The results of MSP showed that the methylated band of the treated group was weaker than that of the untreated group and the unmethylated band of the treated group was stronger than that of the untreated group. Real-time PCR results showed that the relative expression levels of microRNAs in the treatment group were higher than those in the control group ( P<0.05). The CCK-8 assay showed that inhibition rate of the treatment group showed dose-dependent effect with the increase of drug concentration. Wound healing assay showed that the wound healing rate of Treatment group was lower than that of untreated group ( P<0.01). The results of transwell assay showed that the number of migrated cells in the treated group was less than that in the untreated group ( P<0.01). CONCLUSION: Decreased methylation levels in microRNA promoter region caused by 5-Aza-CdR treatment increased the expression of miR34a,miR34b ,miR148a and miR203a,leading to inhibition of the proliferation,migration and invasion of pancreatic carcinoma cells.