Epidermal Cells of amphioxus at different developmental stages were investigated by electron microscopy and colloidal carbon tracing experiments.Amphioxus epidermal cells showed different ultrastructural characteristi...Epidermal Cells of amphioxus at different developmental stages were investigated by electron microscopy and colloidal carbon tracing experiments.Amphioxus epidermal cells showed different ultrastructural characteristics at larval and adult stages. The epidermal cells at all larval stages studied (24-96 h) had numerous usicles containing elatron dense materials in their apical Cytoplasm. In tracing experiments, carbon particles were found in apical vesicles and intercellular spaces. Under scanning electron microscope,many crater-like protrusions were observed on the surface of the cells. These results indicated that amphioxus larva epidermal cells may be capable of endocytosis. The epidermal cells of 3-month and adult amphioxus un obviously secretory ones characterized by well -developed peripheral filaments, a prominent Golgi apparatus and abundant apical secretory vesicles. This study also showed that adult amphioxus body surfare mucus contained lectin that could aggutinate human red blood cels. The authors propose that the epidermal cells of amphioxus larva and adult may contribute to the immune defense of the animal by different means.展开更多
文摘Epidermal Cells of amphioxus at different developmental stages were investigated by electron microscopy and colloidal carbon tracing experiments.Amphioxus epidermal cells showed different ultrastructural characteristics at larval and adult stages. The epidermal cells at all larval stages studied (24-96 h) had numerous usicles containing elatron dense materials in their apical Cytoplasm. In tracing experiments, carbon particles were found in apical vesicles and intercellular spaces. Under scanning electron microscope,many crater-like protrusions were observed on the surface of the cells. These results indicated that amphioxus larva epidermal cells may be capable of endocytosis. The epidermal cells of 3-month and adult amphioxus un obviously secretory ones characterized by well -developed peripheral filaments, a prominent Golgi apparatus and abundant apical secretory vesicles. This study also showed that adult amphioxus body surfare mucus contained lectin that could aggutinate human red blood cels. The authors propose that the epidermal cells of amphioxus larva and adult may contribute to the immune defense of the animal by different means.
