Antitumoral Activity of Rapamycin Mediated Through Inhibition of HIF-1alpha and VEGF in Hepatocellular Carcinoma

Rapamycin (RAPA) inhibits tumor growth and angiogenesis in hepatocellular carcinoma (HCC). The molecular mechanism underlying the antitumoral effects of RAPA remains unclear. Here we established a chemical-induced rat HCC model to investigate the signaling pathways mediating RAPA’s antitumor activity. We found that RAPA exposure significantly diminished tumor growth, angiogenesis, and metastasis of HCC. Meanwhile, the antitumor drug dramatically decreased expression of HIF-1alpha and VEGF, either at mRNA or protein levels. Moreover, the low-dose of RAPA (1.5 mg/kg/day) was effective enough to markedly inhibit tumor progression of HCC. The preliminary results suggested that the antitumoral effects of RAPA might be at least partially mediated through downregulation of HIF-1alpha and VEGF, and low-dose RAPA-based regimens exhibited a promising future in treatment of HCC.     

雷帕霉素抑制肿瘤血管生成的研究进展

实体瘤的生长和转移与血管生成密切相关,抑制肿瘤血管生成可作为控制肿瘤的重要手段。最近研究表明免疫抑制剂雷帕霉素具有抗肿瘤血管生成作用,这种作用可能与抑制血管内皮细胞增殖与迁移,减少促血管生成因子释放及促进肿瘤血管血栓形成等有关。对雷帕霉素抗肿瘤血管生成作用的深入研究可使其不仅作为一种免疫抑制剂,还可作为一种抗肿瘤药物应用于临床。现就雷帕霉素抑制肿瘤血管生成的可能机制作一综述。     

肝癌手术的非接触分离技术研究进展

为了避免手术时肿瘤细胞的播散,在切除肿瘤部分前先将肿瘤区域的淋巴、血管结扎、离断,这种技术称之为"非接触分离技术".对于肝癌的手术,传统的方法是在离断肝实质之前,充分游离预切除的肝叶,并旋转肝脏托至切口的前面,以便在肝外对肝静脉和第三肝门进行控制.这种手术可能会导致肝脏的缺血再灌注损伤,诱导休眠期肿瘤细胞释放前血管生成刺激因子促进VEGF水平的上升,加快其微小灶转移的进展,而肝脏手术旋转过程中对肿瘤的挤压可能会加重肿瘤细胞随血循环播散或在肝内门静脉系统播散的机率.肝癌手术的非接触分离技术是一项减少肝脏损害,防止术中转移和术后复发,值得深入探讨的新策略.     

单球囊扩张下腔静脉治疗布—加综合征

１９９１年４月至１９９５年８月１８例下腔静脉阻塞所致布－加综合征患者接受了单球囊扩张治疗，其中膜型１０例，段型８例，除１例段型穿刺激破膜失败外，余１７例均成功地扩张致１０－２０ｍｍ，ｇｕｆｑ１５．２ｍｍ，阻塞下方下腔静脉压力从平均２．８ｋＰａ下降至１．４ｋＰａ，随访１－５４月，除２例段型术后出现再狭窄外，余１５例均下腔静脉通畅，症状缓解。上下腔同时插管造影，阻塞段部位、长度显示清楚，同时上方之导管