The analysis of destroying vicious cvcle towards acute severe brain injury complicated ARDS / 中国基层医药

Objective To investigate the curative effect of acute severe brain injury complicated ARDS, Methods 31 patients who had acute severe brain injury complicated ARDS were divided into two groups:A group was early discovery of ARDS and given treatment.B group was late discovery of ARDS and treated late.Then the curative effects were compared.Results A group was significantly higher than B group in blood gas analysis(P

Molecular mechanism of HCV NS5A on p53's inhibition of AFP expression in hepatocellular carcinoma cells / 中华肝脏病杂志

<p><b>OBJECTIVE</b>To explore hepatitis C virus (HCV) non-structural protein 5A (NS5A)'s influence on inhibition of AFP expression executed by p53 protein and its possible molecular mechanism.</p><p><b>METHODS</b>Plasmid transfection and MEIA were employed to observe p53's inhibitive effect on AFP expression of Huh7 cells and the HCV NS5A's influence on p53 function. Western blot was employed to find out if HCV NS5A affects p53 protein expression and GST pull down assay was applied to examine the interaction between HCV NS5A and p53.</p><p><b>RESULTS</b>The AFP concentration in the supernatant of the culture of the Huh7 cells transfected with pRc/CMV was (14322+/-2412) ng/ml, and that of the Huh7 cells transfected with pCNS5A was (13843+/-3218) ng/ml; no significant difference existed between these two groups (t = 1.42, P > 0.05). After transfection with pC53-NS3, the AFP level was decreased to (10 241+/-1326) ng/ml, and in comparison to the above two groups it had a statistically significant difference (t values were 2.41 and 2.38, P < 0.05). When co-transfected with pCNS5A and pC53-NS3, the AFP expression (14582+/-1238) ng/ml returned to the level of pRc/CMV transfected, and there was a remarkably significant difference between this and that of the pC53-NS3 transfected cells (t = 3.12, P < 0.01). HCV NS5A had no function on the p53 protein expression with Western blot experiment. In the GST pull down assay, an HCV NS5A protein band was found after GST-p53 was added, but not detected with GST only.</p><p><b>CONCLUSION</b>We found that p53 has an inhibitive function on the AFP expression in Huh7 cells and HCV NS5A minimized this p53 function. HCV NS5A did not affect p53 protein expression, but was able to form a complex with p53, by which HCV NS5A inactivated this p53 function.</p>