3β - Hydroxy - 13α - amino - 13, 17 - seco - 5α - androstan - 17 -oic-13,17-lactam-p-bis(2-chloroethyl)amino phenylacetate (ASE) is a homo-aza-steroidal ester of p-bis(2-chloroethyl) amino phenyl acetic acid and has been shown to display antineoplastic, mutagenic and genotoxic activity. In the present study an effort has been made to evaluate the ability of ASE to induce micronuclei (MN) in human lymphocytes treated in vitro using the cytokinesis-block assay. Lympocytes were treated with different concentrations of ASE (0.1, 0.25, 0.5, 1, 2.5, 5, 10 and 20 μg/ml) at two different cell culture times, 21 and 41 h after culture initiation. ASE treatment lasted until cell harvest, for 51 and 31 h, respectively. Two types of cultures were used, whole blood and isolated lymphocyte cultures. The content of induced MN was identified by FISH analysis, using an α-satellite DNA probe, in binucleate cells. Our results suggest that ASE is capable of increasing MN frequencies in human lymphocytes under both culture conditions. This increase is related to the concentration in a linear dose-dependent manner and is also dependent on the duration of treatment. FISH analysis has shown that the induced MN resulted mainly from breakage events. Additionally, a weak aneugenic effect was found at the higher concentrations in whole blood cultures as well as in isolated lymphocyte cultures. Cytotoxic effects of ASE were observed under both cell culture conditions with a linear dose-dependent relationship according to CBPI evaluation and were more pronounced in isolated lymphocyte cultures.
3β-羟基-13α-
氨基-13,17-仲-5α-
雄甾烷-17-酸-13,17-内酰胺-对-双(2-
氯乙基)
氨基
苯乙酸(A
SE)是一种对-双(2-
氯乙基)
氨基
苯乙酸的均氮
甾醇酯,已被证明具有抗肿瘤、诱变和遗传毒性活性。在本研究中,我们使用细胞分裂受阻试验来评估 A
SE 在体外处理的人类淋巴细胞中诱导微核(MN)的能力。在两个不同的
细胞培养时间(培养开始后 21 和 41 小时),用不同浓度的 A
SE(0.1、0.25、0.5、1、2.5、5、10 和 20 μg/ml)处理淋巴细胞。A
SE 处理分别持续 51 小时和 31 小时直至细胞收获。使用了两种培养物:全血培养物和分离的淋巴
细胞培养物。通过使用α-卫星DNA探针对双核细胞进行FISH分析,确定了诱导MN的含量。我们的结果表明,在这两种培养条件下,A
SE 都能增加人类淋巴细胞中的 MN 频率。这种增加与浓度呈线性剂量依赖关系,也与处理时间长短有关。FISH 分析表明,诱导的 MN 主要来自断裂事件。此外,在较高浓度的全血培养物和分离的淋巴
细胞培养物中发现了微弱的非遗传效应。根据 CB
PI 评估结果,在这两种
细胞培养条件下都观察到了 A
SE 的细胞毒性效应,且与剂量呈线性依赖关系,在离体淋巴
细胞培养中更为明显。