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Liposome-Encapsulated Hemoglobin Ameliorates Tumor Hypoxia and Enhances Radiation Therapy to Suppress Tumor Growth in Mice

机译:脂质体包裹的血红蛋白改善了肿瘤的缺氧并增强放射治疗以抑制小鼠的肿瘤生长。

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We hypothesize that liposome-encapsulated hemoglobin with high O2 affinity (P5002?=?12?mm?Hg, h-LEH) may increase O2 delivery to hypoxic tumors and enhance radiation therapy synergistically to suppress tumor growth. First, h-LEH (5, 10, and 20?mL/kg) was intravenously infused 30?min before radiation (20?Gy) of SCCVII tumor grown in C3H/HeN mice. Second, 10?mL/kg of h-LEH was administered 30, 60, 90, and 120?min prior to radiation to determine optimal timing. Tumor size was monitored thereafter to titrate tumor growth suppression. Third, additional mice with SCCVII tumor were infused with h-LEH or empty liposome (EL), and tumors were excised at various time points for immunohistochemical examination of h-LEH and hypoxia-inducible factor-1 (HIF-1). h-LEH was most effective at 10?mL/kg in comparison to 5 or 20?mL/kg of h-LEH or EL. Tumor growth was most suppressed when the interval between h-LEH infusion and radiation was shortest, 30?min. As a result, 10?mL/kg of h-LEH infusion 30?min prior to radiation prolonged 5-fold tumor-growth time from 20.0?days (radiation and EL) to 26.5?days, P?
机译:我们假设脂质体包裹的血红蛋白具有高O 2 亲和力(P 50 0 2 ?=?12?mm?Hg,h-LEH )可能会增加缺氧肿瘤的O 2 传递,并协同增强放射治疗以抑制肿瘤的生长。首先,在放射(20?Gy)C3H / HeN小鼠中生长的SCCVII肿瘤之前30?min静脉输注h-LEH(5、10和20?mL / kg)。其次,在放疗前30、60、90和120?min给予10?mL / kg的h-LEH,以确定最佳时机。此后监测肿瘤大小以滴定肿瘤生长抑制作用。第三,向另外的患有SCCVII肿瘤的小鼠输注h-LEH或空脂质体(EL),并在各个时间点切除肿瘤以进行h-LEH和缺氧诱导因子1(HIF-1)的免疫组织化学检查。与5或20?mL / kg的h-LEH或EL相比,h-LEH最有效的浓度为10?mL / kg。当h-LEH输注和放疗之间的间隔最短30分钟时,肿瘤的生长受到最大的抑制。结果,放疗前30?min输注10?mL / kg h-LEH可将肿瘤生长时间延长5倍,从20.0天(放射和EL)延长至26.5天,P 0.01,协同作用比1.42。给药后0.5至24?h在肿瘤中检测到人血红蛋白(h-LEH),而输注h-LEH后,与对照组48和72?h相比,HIF-1的积聚稀疏并明显减少。 h-LEH(10?mL / kg)在环境呼吸作用下协同增强放射治疗对小鼠肿瘤的生长非常有效。 H-LEH治疗的肿瘤中HIF-1的积累减少可能表明靶向氧合是潜在的机制。

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