Objective To investigate the expression of hypoxia inducible factor-1?and VEGF in lung of mice during hypoxia and its relationship with angiogenesis.Methods The mice were divided into two group(hypoxia group and control group).The hypoxia group mice were placed in a hypoxia chamber with 10%,7%,or 5%O2 respectively for 3,6,9 days.Immuno- histochemical staining technique was used to examine HIF-1?,VEGF and MVD.The p rotein expression of HIF-1? and VEGF were observed by Western blot.Results HIF-1?proteins didn't express and VEGF proteins expressed weakly in control group mice;Compared with the controls,the expression of HIF-1?and VEGF increased dramadically.There were significant differences between the hypoxia groups and the control group;Positive relationships were found between the expression of HIF-1?,VEGF and MVD.Conclusion HIF-1?/VEGF pathway may play an important role in angiogenesis of hypoxia in the lung of mice.

Objective :To observe clinical effect of Viatorr stents in TIPS for treatment of portal hypertension. Methods Thirty-four portal hypertension patients who underwent TIPS using Viatorr stents were collected. The portal vein pressure, the incidence of hepatic encephalopathy and patency rate of shunt were analyzed. Results TIPS was successfully performed using Viatorr stent, the technical success rate was 100%. The preoperative and postoperative portal pressures were (40.00±3.85)cmH2O and (23.60±2.87)cmH2O, respectively. During 1 to 14 months' follow-up, the patency rate of shunt was 100% (34/34), and the incidence of hepatic encephalopathy was 5.88% (2/34). Conclusion :Viatorr TIPS for treatment of portal hypertension has high operative success rate, high shunt patency rate and low incidence of hepatic encephalopathy.

BACKGROUNDIt has been proved that hypoxia is closely related to oncogenesis and development of tumor. The aim of this study is to observe the effect of dexamethasone on expression of hypoxia inducible factor 1α (HIF-1α) and vascular endothelial growth factor (VEGF) in lung tissues of hypoxic mice, and to investigate the relationship between hypoxia and angiogenesis and mechanism of dexamethasone.

METHODSThe Kunming mice were randomly divided into control group and three experimental groups (3-day hypoxia group, 6-day hypoxia group, and hypoxia+dexamethasone group). HIF-1α and VEGF protein expression was detected in lung tissues of mice by immunohistochemistry.

RESULTSExpression of HIF-1α and VEGF significantly increased in hypoxia group compared with control group (P < 0.05). Compared with hypoxia group, expression of HIF-1α and VEGF decreased dramatically in hypoxia+dexamethasone group (P < 0.05). A positive correlation was found between the expression of HIF-1α and VEGF (r=0.730, P=0.007).

CONCLUSIONSHypoxia can increase the expression of VEGF and HIF-1α in lung tissues of mice. Dexamethasone can inhibit the expression of VEGF and HIF-1α of hypoxic mice and it may have anti-angiogenetic effect.

Objective To compare the efficacy and safety of tenofovir disoproxil fumarate ( TDF) and entecavir(ETV) in the treatment of chronic hepatitis B(CHB) with positive hepatitis B E antigen(HBeAg). Methods A total of 104 cases with newly diagnosed HBeAg positive CHB were selected and randomly divided into TDF group and ETV group,with 52 cases in each group. The TDF group was given 300mg/d TDF,and the ETV group was given 0. 5mg/d ETV. All the patients were continuously treated for 12 months. The serum HBV DNA, HBeAg and ALT levels before and after treatment were compared between the two groups. Results Before treatment,there were no statistically significant differences in serum HBV DNA,HBeAg and ALT levels between the two groups ( t=0. 12, 1. 51,1. 62,all P＞0. 05). The serum HBV DNA,HBeAg and ALT levels in the two groups were decreased after treatment,and the decrease of serum HBV DNA level in the TDF group was more significant than that in the ETV group,the difference was statistically significant(t =3. 54,P ＜0. 05),but there were no statistically significant differences in serum HBeAg and ALT levels between the two groups(t=0. 04,0. 79,all P＞0. 05). The total effective rate of the TDF group was 92. 31% (48/52),which was significantly higher than 76. 92% (40/52) in the ETV group (χ2=4. 73,P＜0. 05). During treatment,the incidence rate of adverse reaction of the TDF group was 7. 69% (4/52),which was lower than 11. 54% (6/52) of the ETV group,but the difference was not statistically significant (χ2=0. 44,P＞0. 05). Conclusion TDF has better clinical effect in treating newly diagnosed HBeAg positive CHB than ETV due to TDF can inhibit HBV DNA replication significantly,but the safety of TDF and ETV is similar.

Objective To evaluate the long-term efficacy of transjugular intrahepatic portosystemic shunt(TIPS)with bare stents and Fluency covered stents in the treatment of portal hypertension,and to discuss its clinical value.Methods The clinical data of 29 patients with intractable ascites or esophagogastric fundus varices rupture and hemorrhage caused by cirrhotic portal hypertension,who received TIPS with bare stents and covered stents at the First Affiliated Hospital of Xinjiang Medical University of China(25 patients)and the Lishui Municipal Central Hospital of China(4 patients)between August 2012 and December 2017,were retrospectively analyzed.The patients were regularly followed up to check the survival status.The postoperative cumulative shunt patency rate and cumulative survival rate of the patients were analyzed by Kaplan-Meier method.Results The technical success rate of TIPS was 100％.The mean portal vein pressure was decreased from preoperative(40.21±3.24)cmH2O to postoperative(24.55±3.55)cmH2O(P＜0.05).The patients were followed up for 5.1-10.5 years.The postoperative 1-,3-,5-,7-year primary cumulative patency rates of the shunt were 89.7％,75.9％,75.9％ and 52.5％,respectively.The postoperative 5-,7-,9-and 10-year cumulative survival rates were 100％,66.9％,66.9％ and 33.4％,respectively.The incidence of hepatic encephalopathy was 13.8％(4/29).Conclusion Using bare stents combined with Fluency covered stents for TIPS is clinically safe and effective in the treatment of portal hypertension.This technique carries higher long-term shunt patency rate and low incidence of hepatic encephalopathy.Therefore,it can be used as a substitute for Viatorr stent when necessary.(J Intervent Radiol,2024,33:295-299)