为了确定这种变化究竟与哪种分子相关,韦杰斯和同事对老鼠的血液进行了测试,发现幼龄鼠体内含有大量名为GDF11的蛋白质,而这种蛋白质在老龄鼠体内较少。为了确定GDF11是不是对异种共生效应的关键因素,科学家制造了一些这种蛋白质,并将它注入老龄鼠体内。单是GDF11就能使它们的心脏恢复活力。
Dr. Wagers and her colleagues wondered whether GDF11 was responsible for the rejuvenation of other tissues. In the current issue of the journal Science, they report an experiment on skeletal muscle in mice. They found that GDF11 revived stem cells in old muscles, making old mice stronger and increasing their endurance.
韦杰斯和同事想知道GDF11是否起到了使其他组织恢复活力的作用。他们在本期《科学》(Science)杂志中阐述了针对老鼠骨骼肌肉的一项实验,实验发现GDF11能使老龄鼠肌肉中的干细胞恢复活力,增强老龄鼠的体质,延长它们的寿命。
At Stanford, researchers were investigating whether the blood of young mice altered the brains of old mice. In 2011, Saul Villeda, then a graduate student, and his colleagues reported that it did. When old mice received young blood, they had a burst of new neurons in the hippocampus, a region of the brain that is crucial for forming memories.
斯坦福大学(Stanford)的研究人员曾对幼龄鼠的血液是否能改变老龄鼠的脑功能进行过研究。2011年,当时还是研究生的索尔·比列达(Saul Villeda)和同事表示,答案是肯定的。接受幼龄鼠的血液之后,老龄鼠的海马体就会大量产生新的神经元。海马体是大脑中的一个区域,对记忆的形成具有关键作用。
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