【摘要】 目的:观察透明质酸酶(Hyaluronidase,Hyase)在氟尿嘧啶(5-FU)对裸小鼠结肠癌移植瘤生长影响中的作用,并探讨其作用的可能机制。方法:18只雄性裸小鼠左侧腹壁皮下移植三维培养人结肠癌HT-29细胞,随机分为6组,每组3只:Ⅰ组(对照组)、Ⅱ组[Hyase200U/(kg.d)]、Ⅲ组[5-FU30mg/(kg.d)]、Ⅳ组[Hyase50U/(kg.d)+5-FU30mg/(kg.d)]、Ⅴ组[Hyase100U/(kg.d)+5-FU30mg/(kg.d)]和Ⅵ组[Hyase200U/(kg.d)+5-FU30mg/(kg.d)],Hyase于肿瘤细胞移植处第1、5天皮下注射,5-FU于第1～5天右侧腹腔注射。每周以游标卡尺测定瘤体最长径和最短径,计算肿瘤体积和抑瘤率,第6周杀鼠称瘤重,取瘤组织行HE染色,Westernblotting法检测瘤组织中E-钙黏素(E-cadherin)、细胞间黏附分子-1(ICAM-1)和NF-κBp65蛋白的表达并对蛋白条带的光密度(OD)进行半定量分析。结果:裸小鼠均成功移植皮下肿瘤,与对照组(Ⅰ组)比较,单纯Hyase治疗组(Ⅱ组)肿瘤体积减小不明显(P>0.05),单纯5-FU治疗组(Ⅲ组)自第3周开始肿瘤体积明显减小(P<0.05),而不同剂量Hyase联合5-FU治疗组(Ⅳ、Ⅴ、Ⅵ组)瘤体积减小更明显(P<0.05);与单纯5-FU治疗组(Ⅲ组)比较,第3周开始联合治疗组(Ⅳ、Ⅴ、Ⅵ组)瘤体积明显减小(P<0.05);第6周Ⅱ～Ⅵ组抑瘤率分别为6.8%、17.5%、34.1%、46.3%和56.6%;Ⅲ～Ⅵ组瘤重均低于Ⅰ组(P<0.05或P<0.01);Ⅱ、Ⅳ、Ⅴ、Ⅵ组瘤组织内E-cadherin和ICAM-1蛋白条带OD值均较Ⅰ组有不同程度减低,而NF-κBp65蛋白条带OD值在各组间无明显变化(P>0.05)。结论:透明质酸酶可能通过抗细胞黏附在结肠癌化疗中具有增敏作用。更多还原

【Abstract】 Objective:To observe hyaluronidase as a chemosensitizer in nude mice colon carcinoma and to explore its mechanisms.Methods:Eighteen male BALB/c nude mice were subcutaneously implanted with HT-29 spheroids,they were treated by hyaluronidase or/and 5-FU through intraperitoneal injection.We measured the length and width of tumor using sliding caliper weekly.The tumor volumes and inhibiting rate were calculated.The tumor mass were excised 6 weeks later,and the expression of E-cadherin,ICAM-1 and NF-κB p65 was detected by western blotting and analyzed by semiquantitative method.Results:All nude mice were implanted HT-29 spheroid cells successfully.Treatment of hyaluronidase alone couldn’t reduce the tumor volume,but the tumor volume by using 5-FU alone or hyaluronidase+5-FU was decreased to some extent.The effect of high dose hyaluronidase+5-FU was most significant.Comparing with 5-FU alone,combination of hyaluronidase and 5-FU could significantly reduce the tumor volume(P<0.05).The expression of E-cadherin and ICAM-1 was decreased by treatment of hyaluronidase,but NF-κB p65 was no difference in all groups.Conclusion:Hyaluronidase can be used as a chemosensitizer in colon carcinoma and the mechanisms may be involving its anti-adhesion effect.更多还原