In a search for more selective anticancer drugs, we have designed nitrogen mustard and nitrosourea conjugates leading to a series of N-4-aryl-N′-2-chloroethylureas (CEUs). The iodinated derivative N-4-iodophenyl-N′-2-chloroethylurea (4-ICEU) has demonstrated significant antineoplastic and antiangiogenic potency in preclinical evaluations. In this study, 4-ICEU was radiolabelled with [125I]iodide in order to carry out a comparative study of its in vivo behavior profile. 4-[125I]-ICEU was synthesized by direct electrophilic radioiodination with 80% radiochemical yield and 97% radiopurity. Three different routes of administration (intraperitoneal (ip), intravenous (iv) and intratumoral (it)) were tested in mice bearing subcutaneously implanted CT-26 murine colon carcinoma. The results clearly established that 4-ICEU was more stable to biotransformation than previously studied CEUs congeners. It was readily bioavailable and reached the CT-26 colorectal tumor regardless of the route of administration. Additionally, the colon mucosa was an important target tissue where 4-ICEU accumulated and remained largely untransformed. In conclusion, these results justify further investigations for developing 4-ICEU as a new chemotherapeutic agent for colorectal cancer.
为了寻找选择性更强的抗癌药物,我们设计了
氮芥和亚硝基
脲共轭物,从而产生了一系列 N-4-芳基-N′-2-
氯乙基
脲(CEUs)。
碘化衍
生物 N-4-
碘苯基-N′-2-
氯乙基
脲(4-ICEU)已在临床前评估中显示出显著的抗肿瘤和抗血管生成效力。本研究用[125I]
碘化物对 4-ICEU 进行了放射性标记,以便对其体内行为特征进行比较研究。4-[125I]-ICEU 是通过直接亲电放射
碘化法合成的,放射
化学收率为 80%,放射纯度为 97%。在皮下注射 CT-26 小鼠结肠癌的小鼠体内测试了三种不同的给药途径(腹腔注射(ip)、静脉注射(iv)和瘤内注射(it))。结果清楚地表明,与之前研究过的 CEUs 同系物相比,4-ICEU 对
生物转化更稳定。无论通过何种途径给药,4-ICEU 都很容易被
生物利用并到达 CT-26 大肠肿瘤。此外,结肠粘膜是一个重要的靶组织,4-ICEU 在结肠粘膜中积聚,而且基本上没有发生转化。总之,这些结果证明有理由进一步研究将 4-ICEU 开发为治疗结直肠癌的新化疗药物。