Postmeiotic unfertilized starfish eggs die by apoptosis.

Postmeiotic unfertilized starfish eggs die by apoptosis.
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减数分裂后未受精的海星卵因细胞凋亡而死亡。

DOI:
10.1006/dbio.2001.0361
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发表时间:
2001
影响因子:
2.7
通讯作者:
K. Sadler
K. Sadler
中科院分区:
生物学3区
文献类型:
--
作者:
Ő. Yűce;K. Sadler

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减数分裂期间海星卵的受精导致减数分裂 II 完成后迅速进入胚胎发生。未受精卵完成减数分裂,并在减数分裂后间期停滞一段时间,到目前为止,时间不确定。如果它们仍未受精,成熟的减数分裂后卵最终会死亡。本研究的目的是表征减数分裂后未受精海星卵的死亡机制。我们报告说,在两种海星中,在没有受精的情况下,减数分裂后间期停滞持续 16-20 小时,此后细胞同步快速死亡。垂死的卵会挤出膜泡,经历细胞质收缩和变暗,并以类似于凋亡细胞的方式分裂成囊泡。垂死鸡蛋的 DNA 通过 TUNEL 检测进行浓缩、片段化和标记。总而言之,这些数据表明,减数分裂后海星卵的默认命运,就像哺乳动物的同类一样,是通过细胞凋亡而死亡。我们进一步报道,该系统中细胞凋亡的发生和执行依赖于正在进行的蛋白质合成,并受到细胞内Ca(2+)(受精信号通路的重要组成部分)增加的抑制。我们建议将海星卵作为研究发育调控细胞凋亡的有用模型。
Fertilization of starfish eggs during meiosis results in rapid progression to embryogenesis as soon as meiosis II is completed. Unfertilized eggs complete meiosis and arrest in postmeiotic interphase for an, until now, indeterminate time. If they remain unfertilized, the mature postmeiotic eggs ultimately die. The aim of this study is to characterize the mechanism of death in postmeiotic unfertilized starfish eggs. We report that, in two species of starfish, in the absence of fertilization, postmeiotic interphase arrest persists for 16-20 h, after which time the cells synchronously and rapidly die. Dying eggs extrude membrane blebs, undergo cytoplasmic contraction and darkening, and fragment into vesicles in a manner reminiscent of apoptotic cells. The DNA of dying eggs is condensed, fragmented, and labeled by the TUNEL assay. Taken together, these data suggest that the default fate of postmeiotic starfish eggs, like their mammalian counterparts, is death by apoptosis. We further report that the onset and execution of apoptosis in this system is dependent on ongoing protein synthesis and is inhibited by a rise in intracellular Ca(2+), an essential component of the fertilization signaling pathway. We propose starfish eggs as a useful model to study developmentally regulated apoptosis.
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