Objective The human IFN-inducible protein absent in melanoma 2 (AIM2) has been regarded as a tumour sup-pressor, however, the molecular mechanisms of its antitumor activity still remain unclear.This research is to study the molecular mech-anisms of AIM2 inducing breast cancer cell apoptosis. Methods Tet-Off induction model system was established to induce AIM2 ex-pression in great quantities, MCF-7 tTA-AIM2 cells as the experimental group and MCF-7 tTA-Luc cells as control group.Western blotting was used to detect AIM2 expression in breast cancer cell lines and subcellular localization.XTT assay was applied to analyze the effects of AIM2 on cell proliferation.Apoptosis were detected by Annexin V-FITC and propidium iodide staining, and the apoptosis mechanism were investigated by west blot. Results The established Tet-off guidance system could combine tTA to TRE, thereby promoting AIM2 gene transcription and inducing great expression of AIM2 protein.4 days after induction, the expression of AIM2 could be detected in cytoplasm and nucleus, and AIM2 expression increased with the increasing days.XTT assay detected the growth speed of MCF-7 tTA-AIM2 cell lines slowed down 6 days after induction.After abundant expression of induced AIM2, the percentage of FITC fluorescence apoptosis increased significantly (2.36%vs 14.45%, P<0.01) .Increased AIM2 expression inhibited the expression of the anti-apoptotic protein Bcl-xL, increased the expression of the apoptosis proteins Bad and Bax, and activated caspases, resulting in the cleavage of DNA repair protein PARP. Conclusion In breast cancer Tet-off induction system, AIM2 will express in cytoplasm and nucleus, influence cell proliferation, and stimulate the mitochondria to cell apoptosis.

Objective To evaluate endovascular treatment of segmental occlusive Budd-Chiari syndrome(BCS). Methods We retrospectively analyzed the clinical data of segmental occlusive BCS of 45 cases. Inferior vena cava (IVC) puncture, percutaneons transluminal angioplasty (PTA) and stent implant were performed, respectively. Three-dimensional digital subtraction angiography (3D-DSA) was used to evaluate the IVC lesion from multi-angles and to identify the best work angle in complex BCS cases during endovascular treatment. Results IVC puncture and dilation was successful in 43 cases. The pressure of IVC decreased from (35. 3 ± 3.9)cm H2O to (9.5 ± 2. 0) cm H2O (t = 43. 68, P < 0. 01). The puncture failed in 2 cases and the patients were converted to veno-atrial graft shunt. Acute pericardial tamponade developed during PTA in one case. Postoperatively 35 cases were followed-up for 3 months to 46 months and the follow-up rate was 77. 8%. IVC stent thrombosis was identified in one case necessitating veno-atrial graft shunt 15 months post-operatively. There were no stent migration and hepatic venous obstruction in the remaining cases. The case of pericardial tamponade was cured and discharged after IVC repair. Symptoms disappeared except for intercostal neuralgia during 6 months follow-up. There were no pulmonary embolism and death. Conclusions Good medium and long term result could be achieved after endovascular treatment of segmental occlusive BCS. 3D-DSA is helpful for endovascular treatment of BCS.

Objective To evaluate the interventional therapy in Budd-Chiari syndrome (BCS). Methods 12 cases with BCS were treated with balloon dilatation angioplasty and placement of stent. The pathologic types were composed of complete occlusion of inferior vena eava(IVC) (9 cases) and IVC stenosis (3 cases). Results Sue-eess was achieved in 12 cases. IVC eavepressure was(4.56±1.51 )kPa before interventional therapy,and (2.51± 0.77 ) kPa after stent implantation. The symptoms disappeared or markedly improved postoperatively. Complications of hepatic venous occlusion occurred in 1 ease after IVC stent 8 months later,and the symptoms relieved after meso-RA shunt. Conclusion The interventional therapy for BCS is very effective and safe to appropriate patient.

Objective To evaluate endovascular treatment of Budd-Chiari syndrome(BCS)with occlusion of hepatic veins.Methods Retrospective analysis on the clinical materials of 32 BCS cases with occlusion of hepatic veins was made.Four cases received inferior vena cava(IVC)angioplasty or stent implant and splenorenal shunt;Transfemoral vein or transjugular hepatic vein angioplasty was performed in 10 cases,and percutaneous transhepatic recanalization combined with transjugular and/or transfemoral vein angioplasty of hepatic veins was performed in 16 cases,respectively.Two cases failed therapy attempt.Results A failure to find the main hepatic vein in percutaneous transhepatic venography lead to the abandent of therapy in 2 cases.Hepatic vein angioplasty and IVC angioplasty was successful in the other 30 cases.The pressure of hepatic vein decreased from(43±8)cm H_2O to(16±4)cm H_2O(t=21.23,P<0.01).The symptoms were obviously relieved,ascites disappeared,abdominal distension palliated,chest and abdominal wall varicose veins collapsed one week after endovascular treatment.During perioperative procedure,2 cases with liver puncture bleeding were cured by laparotomy.The follow-up duration was 5 months to 65 months and mean(26.0±2.0)months.There was no stent migration and hepatic vein restenosis and occlusion.Chest and abdominal wall varicose veins disappeared and esophagus phlebeurysma were ameliorated as shown by esophageal barium series.There were no pulmonary embolism and death.Conclusions The procedure of endovascular treatment of BCS with occlusion of hepatic veins is simple,mini-traumatic and effective.