胚胎研究中的伦理激变

看似是2005年最为重大的科技进步正遭受质疑。6月份,著名的<<科学>>杂志发表韩国科学家黄禹锡以及一个国际合作小组的文章。该文描述他们如何制成从成人身上克隆而成的“预制的”干细胞株。尽管其研究的科学准确性正在同时接受不同的调查,但是,审查其伦理含义的重要性一点也不逊色。

黄禹锡及其同事宣称,他们将未受精人卵核替换为从另一个人身上提取的正常细胞核,从而,从由此产生的胚胎上制成了干细胞株,这一胚胎符合提供正常细胞人的NDA。这一成就似乎把我们大为推近到这样一个世界,那就是将来可以对病人进行细胞或组织移植,而病人的身体不会拒绝,因为从病人自身身体克隆而得的生物材料将会完全相符。

12月初,黄禹锡披露,其中某些卵子来自于在其实验室工作的两名妇女,而且,其他“捐献者”也为她们的卵子而得到报酬。这违反了伦理标准,而与科学准确与否无关。但是,黄禹锡的同僚们随后又开始质疑实验本身的准确性,而黄通知<<科学>>杂志表明希望撤回论文。在本文写作之时,他仍然为其工作的准确性辩护,同时承认在保持干细胞株时出现了“人为错误”,包括受到真菌感染。据报道,他甚至暗示对某些细胞做了手脚。

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