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Ultrastructural studies of vitellogenesis in oocytes and follicle cells during oogenesis in female Protothaca (Notochione) jedoensis (Bivalvia: Veneridae)

Animal Cells and Systems 2010년 14권 4호 p.343 ~ 349
강희웅, 최기호, 전제천, 이기영, 박관하,
소속 상세정보
강희웅 ( Kang Hee-Woong ) - National Fisheries Research and Development Institute West Sea Fisheries Research Institute
최기호 ( Choi Ki-Ho ) - National Fisheries Research and Development Institute West Sea Fisheries Research Institute
전제천 ( Jun Je-Cheon ) - NFRDI Aquaculture Research Institute
이기영 ( Lee Ki-Young ) - Kunsan National University Department of Marine Biotechnology
박관하 ( Park Kwan-Ha ) - Kunsan National University Department of Aquatic Life Medicine

Abstract


Ultrastructural studies of vitellogenesis in oocytes and follicle cells during oogenesis in female Protothaca (Notochione) jedoensis were investigated by histological and transmission electron microscope observations. In early vitellogenic oocytes, combined activities of the Golgi complex, mitochondria and rough endoplasmic reticulum in the cytoplasm are associated with autosynthetic vitellogenesis. Furthermore, at this time, many coated vesicles at the basal region of the oolemma of the oocyte lead to the formation of vesicles through endocytosis in the cytoplasm. Through the formation of the coated pits on oolemma during vitellogenesis, the uptake of extrafollicular precursors (nutritive materials) occurs in coated vesicles by endocytosis. Therefore, it is assumed that these exogenous materials are involved in heterosynthetic vitellogenesis. During late oogenesis, exogenous yolk precursors (yolk granules), lipid droplets and proteinaceous yolk granules are present in the cytoplasm of late vitellogenic oocytes. In mature oocytes, small yolk granules appear intermingled and form large mature yolk granules. Thus, two processes of vitellogenesis occur in oocytes by way of endogenous autosynthesis and exogenous heterosynthesis. The follicle cells attached to the oocytes appear to play an integral role in vitellogenesis in this study.

키워드

Protothaca (Notochione) jedoensis; oogenesis; vitellogenesis; follicle cells

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