超声辐照载羟基喜树碱微泡对肝癌SMMC-7721 细胞凋亡及相关蛋白表达的影响

Objective To investigate the effects of ultrasound irradiating hydroxycamptothecin (HCPT)-loaded microbubbles on apoptosis in human hepatoma SMMC-7721 cells, and to clarify its probable mechanism. Methods The SMMC-7721 cells were randomly divided into six groups as follows: control group, blank liposome microbubbles plus ultrasound, HCPT-loaded microbubbles, HCPT, HCPT plus ultrasound,and HCPT-loaded microbubbles plus ultrasound. Apoptosis was ascertained by Annexin V-Fire/ PI and TUNEL methods. The expression of Bcl-2 and Bax protein was detected by immunocytochemistry staining technique. Results In the group of HCPT-loaded microbubbles plus ultrasound,the apoptosis rate at early term was found to reach (12.18 ± 1.38)% by Annexin V-Fitc/PI assay, brown-colored positive apoptotic cells were observed and the apoptosis rate at advanced term was found to reach (34.25 ± 1.83)% with TUNEL method. The expression of Bcl-2 was found to decrease,the expression of Bax increase,and the ratio of Bcl-2/bax significantly decrease by immunocytochemistry staining technique in the same group. Differences with other groups were significant. Conclusions The method of ultrasound irradiating HCPT-loaded microbubbles can notability induce human hepatoma SMMC-7721 cells apoptosis. The decrease in the ratio of Bcl-2 to Bax might be responsible for cells apoptosis.     

白细胞介素13对HEL细胞分化和转录因子c-fos表达的影响

目的研究白细胞介素13（IL-13）对红白血病细胞系HEL细胞分化作用及对HEL细胞转录因子c-fos表达的影响。方法用RT—PCR方法检测HEL细胞IL-13受体仪1、GPⅡb、vWF和c-fos基因mRNA表达，用Western blot和流式细胞术分别检测IL-13受体α1、c-fos、GPⅡb和vwF蛋白水平的表达。结果HEL细胞表达IL-13受体α1，用IL-13（100ng／ml）作用于HEL细胞，GPⅡb和vWF基因mRNA表达上调，实验组和对照组GPⅡb／β-actin吸光度比值分别为2．912，1．303，实验组为对照组的2．23倍（P〈0．05）；实验组和对照组vWV／f3一actin吸光度比值分别为0．506，0．217，实验组为对照组的2．33倍（P〈0．05）。流式细胞术分析结果显示，实验组GPⅡb和vWF蛋白表达明显高于对照组。IL-13作用于HEL细胞30min，c—fos基因mRNA表达水平达高峰，IL-13作用HEL细胞60min，c—fos蛋白表达达高峰，30min组、60min组c-fos/β-actin吸光度比值高于其它各组（P〈0．05）。结论IL-13可促进HEL细胞分化，并上调c-fos表达。     

超声辐照载羟基喜树碱微泡对肝癌SMMC-7721 细胞凋亡及相关蛋白表达的影响

Objective To investigate the effects of ultrasound irradiating hydroxycamptothecin (HCPT)-loaded microbubbles on apoptosis in human hepatoma SMMC-7721 cells, and to clarify its probable mechanism. Methods The SMMC-7721 cells were randomly divided into six groups as follows: control group, blank liposome microbubbles plus ultrasound, HCPT-loaded microbubbles, HCPT, HCPT plus ultrasound,and HCPT-loaded microbubbles plus ultrasound. Apoptosis was ascertained by Annexin V-Fire/ PI and TUNEL methods. The expression of Bcl-2 and Bax protein was detected by immunocytochemistry staining technique. Results In the group of HCPT-loaded microbubbles plus ultrasound,the apoptosis rate at early term was found to reach (12.18 ± 1.38)% by Annexin V-Fitc/PI assay, brown-colored positive apoptotic cells were observed and the apoptosis rate at advanced term was found to reach (34.25 ± 1.83)% with TUNEL method. The expression of Bcl-2 was found to decrease,the expression of Bax increase,and the ratio of Bcl-2/bax significantly decrease by immunocytochemistry staining technique in the same group. Differences with other groups were significant. Conclusions The method of ultrasound irradiating HCPT-loaded microbubbles can notability induce human hepatoma SMMC-7721 cells apoptosis. The decrease in the ratio of Bcl-2 to Bax might be responsible for cells apoptosis.     

超声破坏微泡促进骨骼肌血管新生的实验研究

目的　探讨超声破坏微泡引起的微血管破裂促进大鼠骨骼肌血管新生的有效性。方法　将 30只 Wistatr大鼠随机分为 3组 ,1组经静脉输入自制的白蛋白微泡造影剂 0 .5 ml,同时用 1MHz,2 .0 W/cm2 的超声在其骨骼肌局部间歇作用 2 min;1组仅在骨骼肌局部用同等的超声能量作用 ;第 3组作为对照组。实验结束后 ,各组分别取 1只做石蜡切片观察显微结构的变化。各组剩余的大鼠于 2周后处死 ,免疫组化观察骨骼肌中血管内皮生长因子 (VEGF)和血管内皮细胞 因子的表达。结果　超声破坏微泡组大鼠骨骼肌中可见 VEGF和 因子的表达较多 ,有较多的新生血管生成 ;而单纯超声作用组 VEGF和 因子表达较少 ,血管新生不明显 ;对照组中无 VEGF和 因子表达 ,无新生血管。结论　超声破坏微泡引起的微血管破裂可刺激骨骼肌中内源性 VEGF的分泌 ,促进血管生成。     

超声微泡造影诊治肝癌的临床应用进展

随着新型超声微泡造影剂的研究和应用,超声造影不仅可有效提高肝癌早期诊断的敏感性和特异性,而且使肝癌的早期治疗成为可能。本文就相关研究进展综述如下。     

超声微泡造影剂与血管新生

随着对超声微泡造影剂研究的不断深入,人们发现微泡受一定强度超声辐照后会破裂并产生空化效应,从而使局部毛细血管破裂,血管内容物外渗并在局部引起炎症反应,其产生的炎症因子可促进局部组织血管新生,据此可以用来治疗一些缺血性疾病。本文就超声微泡造影剂促进血管新生之机制和应用前景作一综述。     

超声波与微泡声学造影剂增强体外培养肿瘤细胞基因转染实验研究

目的观察超声波与微泡声学造影剂能否增强体外培养肿瘤细胞基因转染及其转染效率,初步摸索适宜的超声辐照条件.方法将培养的HepG2细胞分为3组,第1组为单纯造影剂转染组:加入5 μg绿色荧光蛋白质粒(PEGFP-C1)与微泡声学造影剂混合液进行转染;第2组为脂质体转染组:用相同浓度PEGFP-C1质粒进行常规脂质体转染;第3组为造影剂加超声辐照转染组:加入5 μg PEGFP-C1质粒与微泡声学造影剂混合液,然后分别用0.25 W/cm2、0.5 W/cm2、1.0 W/cm2超声波经培养板底部辐照10 s.24 h后用荧光显微镜观察各转染组细胞荧光蛋白表达情况,计录每高倍视野(400×)荧光蛋白表达阳性细胞数.结果单纯造影剂转染组未见荧光蛋白表达阳性细胞,造影剂加超声辐照转染组可见不同程度荧光蛋白表达,其中以0.5 W/cm2超声辐照组表达最强,每高倍视野绿色荧光蛋白表达阳性细胞数为(20.7±3.2)个/HP,高于0.25 W/cm2与1.0 W/cm2超声辐照组[分别为(4.8±1.9)个/HP;(9.9±2.3)个/HP],与脂质体转染组[(22.1±3.5)个/HP]比较无显著差异(P>0.05).结论微泡声学造影剂加一定强度的超声辐照能显著增强体外培养肿瘤细胞的基因转染与表达,超声辐照条件是影响转染率的重要因素,适宜条件时其转染效率与常规脂质体转染方法无显著差异.     

介入超声印压检测活体心肌硬度的实验研究

目的探索介入超声印压方法检测活体心肌硬度的可行性，为心肌硬度检测提供直接方法。 方法应用自行研制的介入超声硬度检测仪，在X-线指引下，印压健康犬左心室不同部位室壁，得到应力应变关系，获得其硬度值。 结果本研究顺利完成犬活体心肌的硬度检测，游离壁、心尖部的硬度值分别为（17.8±35）kPa、（34．2±6．5）kPa，心尖部心肌硬度高于游离壁（P＜0．001）；检测过程无并发症出现。 结论采用介入超声印压方法检测活体心肌硬度安全可行，是直接、定量获取活体心肌硬度的新方法。     

超声背向散射积分评价晚期高血压心肌病变的临床应用探讨

目的　探讨心肌背向散射积分 (IBS)为基础的组织声学密度 (AD)评价晚期高血压患者心肌病变的价值。方法　采用背向散射积分联机分析技术 ,观察 40例晚期高血压患者与 40例正常人室间隔、左室后壁、左室侧壁部位的IBS、心动周期变化幅度 (CVIB)及左室后壁跨壁梯度 (TG -CVIB)。结果　晚期高血压患者上述部位的IBS值较正常人高 (P <0 .0 5 ) ,CVIB较正常人明显降低 (P <0 .0 5 ) ,TG -CVIB较正常人明显降低 (P <0 .0 1)。结论　心肌背向散射参数可作为评估晚期高血压患者心肌病变的一种无创性检测方法     

超声辐照载羟基喜树碱微泡对肝癌SMMC-7721 细胞凋亡及相关蛋白表达的影响

Objective To investigate the effects of ultrasound irradiating hydroxycamptothecin (HCPT)-loaded microbubbles on apoptosis in human hepatoma SMMC-7721 cells, and to clarify its probable mechanism. Methods The SMMC-7721 cells were randomly divided into six groups as follows: control group, blank liposome microbubbles plus ultrasound, HCPT-loaded microbubbles, HCPT, HCPT plus ultrasound,and HCPT-loaded microbubbles plus ultrasound. Apoptosis was ascertained by Annexin V-Fire/ PI and TUNEL methods. The expression of Bcl-2 and Bax protein was detected by immunocytochemistry staining technique. Results In the group of HCPT-loaded microbubbles plus ultrasound,the apoptosis rate at early term was found to reach (12.18 ± 1.38)% by Annexin V-Fitc/PI assay, brown-colored positive apoptotic cells were observed and the apoptosis rate at advanced term was found to reach (34.25 ± 1.83)% with TUNEL method. The expression of Bcl-2 was found to decrease,the expression of Bax increase,and the ratio of Bcl-2/bax significantly decrease by immunocytochemistry staining technique in the same group. Differences with other groups were significant. Conclusions The method of ultrasound irradiating HCPT-loaded microbubbles can notability induce human hepatoma SMMC-7721 cells apoptosis. The decrease in the ratio of Bcl-2 to Bax might be responsible for cells apoptosis.