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长生不老不再是天方夜谭!科学家发现,一种名叫"灯塔水母"的海洋生物,天生具有"返老还童"的能力,或许是世界上唯一不会死亡的生物.


灯塔水母

英国"泰晤士报"报道,一般的水母通常会在繁殖下一代后死亡,但有一种水母在达到性成熟阶段之后,又会重新回到年轻阶段,开始另一次生命.这种能使自己返老还童的神奇生物,叫灯塔水母(Turritopsis nutricula).

灯塔水母的直径只有4至5毫米,属于水螅虫纲,它们是捕食性生物,可以从水螅体无性繁殖,是目前唯一已知的能够从性成熟阶段回复到的幼虫阶段的生物.从理 论上说,这个循环可以不断重复下去,也就是说,灯塔水母可以永远存活,无需面对死亡.曾经有一位研究灯塔水母的科学家观察了4000条灯塔水母, 确认它们全部都能返老还童,没有一条死亡.

塔水母在热带海域生存,不过科学家相信,它们会随着被排放到港口的船舶压载水散布到世界各地.

灯塔水母究竟是如何逆转老化过程的? 这是海洋生物学家和遗传学家正在重点研究的课题.科学家们认为,灯塔水母"返老还童"是通过细胞的转分化过程实现的.在这个过程中,细胞从一个类型转变为 另一个类型.这种细胞功能的转化,通常会在器官再生的情况下出现,然而,对于灯塔水母来说,这个过程似乎是其生命周期中的常态.

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