PROTOPLASMIC MOVEMENT DURING POLAR-BODY FORMATION IN STARFISH OOCYTES
PROTOPLASMIC MOVEMENT DURING POLAR-BODY FORMATION IN STARFISH OOCYTES
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DOI：
10.1016/0014-4827(78)90524-4
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发表时间：
1978-01-01
影响因子：
3.7
通讯作者：
HIRAMOTO, Y
中科院分区：
文献类型：
--
作者：
HAMAGUCHI, MS;HIRAMOTO, Y
本文以海星卵母细胞为材料，用16 mm电影显微摄影仪记录细胞内颗粒的运动，分析了极体形成过程中原生质的运动。在极体形成之前，细胞表面在动物极扩张，在植物极收缩，伴随着内质从植物极向动物极的运动。随着极体的挤压，挤压区周围的细胞表面收缩，植物极表面扩张，伴随着内质网从动物极向植物极的移动。极体挤出后，动物极的细胞表面扩张，伴随着动物半球的内质网向动物极移动。从这些运动的表面和内质网和细胞形状的变化在极体形成过程中，极体的挤出似乎是由于原生质流入细胞区域在动物极的内部压力通过一个环形区域的皮质积极收缩，形成沟颈。
The movement of protoplasm during the formation of the polar body in starfish oocytes was analyzed by tracing movements of granules in the cell as index markers, recorded by 16 mm cinemicrography. Prepatory to the formation of the polar body, the cell surface expanded at the animal pole and contracted at the vegetal pole, accompanying the movement of endoplasm from the vegetal pole toward the animal pole. With the extrusion of the polar body, the cell surface around the extruded region contracted and the surface at the vegetal pole expanded, accompanying the endoplasmic movement from the animal pole toward the vegetal pole. After extrusion of the polar body, the cell surface at the animal pole expanded, accompanying the endoplasmic movement toward the animal pole in the animal hemisphere. From these movements of the surface and endoplasm and the change in cell shape during polar-body formation, the extrusion of the polar body seems to be caused by the flow of protoplasm into the cell region at the animal pole by internal pressure of the cell through a ring-shaped region of the cortex which actively contracts to form the furrow neck.