EARLY EVENTS IN SEA-URCHIN METAMORPHOSIS, DESCRIPTION AND ANALYSIS
EARLY EVENTS IN SEA-URCHIN METAMORPHOSIS, DESCRIPTION AND ANALYSIS
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DOI：
10.1002/jmor.1051570103
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发表时间：
1978-01-01
影响因子：
1.5
通讯作者：
HINEGARDNER, RT
中科院分区：
文献类型：
--
作者：
CAMERON, RA;HINEGARDNER, RT
The larval epithelium of the sea urchin, Lytechinus pictus, consists of squamous cells and bands of columnar epithelial cells bearing cilia. During metamorphosis this tissue undergoes a series of rapid, complex changes. Using scanning and transmission electron microscopy, these changes were analyzed and described. The changes can be divided into 3 steps. The larval arms bend away from the left side of the larva, exposing the urchin rudiment. Cells which are identical to smooth muscle cells are in a position to bring about this bending. The squamous epithelial cells assume a cuboidal shape. This change in shape results in the collapse of the larval epithelium onto the presumptive aboral surface. These cells possess a subapical band of microfilaments. The cellular shape change but not the bending of the arms is reversibly inhibited by cytochalasin B. These observations suggest a mechanism for this change. The former lining of the vestibule of the urchin rudiment comes to lie over the collapsed larval tissue and forms the adult epithelium. At this point, after only 1 h, the larva assumes the external shape of an adult sea urchin.
