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作 者:明平坡[1] 戈伟[1] 介芳芳[1] 李长虎[1] 徐慧琳[1]
机构地区:[1]武汉大学人民医院肿瘤中心, 武汉 430060
出 处:《实用肿瘤学杂志》2014年第1期1-6,共6页Practical Oncology Journal
基 金:国家自然科学基金资助项目(81272500)
摘 要:目的:观察恩度联合放疗对Lewis肺癌的生长抑制作用,检测肿瘤中微血管密度( MVD)及αvβ3 mRNA的表达,探讨其在肿瘤血管“正常化”及协同抑瘤作用中的可能机制。方法荷瘤小鼠随机分成4组:空白对照组(NC),恩度组(ES),放射治疗组(RT),恩度联合放疗组(ES+RT)。从开始治疗后隔日测量肿瘤体积,绘制生长曲线。免疫组化法及RT-PCR分别检测各组肿瘤组织中MVD及αvβ3 mR-NA的表达情况。结果(1)ES+RT组的抑瘤作用最为明显;(2)与空白对照组相比,RT组随时间延长微血管计数逐渐增加,ES组及ES+RT组下降,其中ES+RT组比ES组下降更为明显,差异有统计学意义(P<0.05);(3)与空白对照组相比,RT组αvβ3 mRNA表达水平升高,而ES及ES+RT组则降低,ES+RT组降低更为明显,ES组在第6天扩增倍数最低,各治疗组在d8~d12均有统计学差异( P<0.05)。结论恩度联合放疗显著抑制Lewis肿瘤的生长;恩度能使肿瘤MVD明显减少,形态趋于正常;恩度可下调αvβ3 mRNA的表达,改善肿瘤组织紊乱的血管网,降低乏氧,可能是放疗增敏的机制之一。Objective To observe the MVD and integrin αvβ3 mRNA expression changes in tumor -bearing rats by using endostar combined with radiotherapy ,and to explore the potential synergy mechanism .Meth-ods We randomly divided the tumor -bearing rats into four groups:control group(NC),endostar group(ES), radiation treatment group ( RT) and endostar combined radiotherapy group ( ES +RT) .Tumor inhibition rate was calculated every other day .Microvessel density and αvβ3mRNA were texted by immunohistochemical or real time PCR in each group.Results (1)ES+RT group showed the most obvious inhibition rate;(2)Compared with NC group,microvessel density of RT was increased ,but decreased in ES group and ES +RT group significantly ( P<0.05);(3)Compared with NC group,αvβ3 mRNA expression of RT group was increased,while decreased in ES group and ES+RT group,and ES +RT group displayed a greater decrease when compared to ES group ( P<0.05).Conclusion Endostar combined radiotherapy can inhibit the growth of cancer and the expression ofαvβ3mRNA,improve the disorders of tumor vascular network .It may be one of the mechanisms of increasing radi-osensitization.
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