Oocyte Degeneration Associated with Follicle Cells in Female Mactra chinensis (Bivalvia: Mactridae)
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Ultrastructural studies of oocyte degeneration in the oocyte, and the functions of follicle cells during oocytedegeneration are described to clarify the reproductive mechanism on oocyte degeneration of Mactra chinensis usingcytological methods. Commonly, the follicle cells are attached to the oocyte. Follicle cells play an important role in oocytedegeneration. In particular, the functions of follicle cells during oocyte degeneration are associated with phagocytosis and theintracellular digestion of products. In this study, morphologically similar degenerated phagosomes (various lysosomes), whichwere observed in the degenerated oocytes, appeared in the follicle cells. After the spawning of the oocytes, the follicle cellswere involved in oocyte degeneration through phagocytosis by phagolysosomes. Therefore, it can be assumed that folliclecells reabsorb phagosomes from degenerated oocytes. In this study, the presence of lipid granules, which occurred fromdegenerating yolk granules, gradually increased in degenerating oocytes. The function of follicle cells can accumulatereserves of lipid granules and glycogen in the cytoplasm, which can be employed by the vitellogenic oocyte. Based onobservations of follicle cells attached to degenerating oocytes after spawning, the follicle cells of this species are involved inthe lysosomal induction of oocyte degeneration for the reabsorption of phagosomes (phagolysosomes) in the cytoplasm fornutrient storage, as seen in other bivalves.
Abstract
Ultrastructural studies of oocyte degeneration in the oocyte, and the functions of follicle cells during oocytedegeneration are described to clarify the reproductive mechanism on oocyte degeneration of Mactra chinensis usingcytological methods. Commonly, the follicle cells are attached to the oocyte. Follicle cells play an important role in oocytedegeneration. In particular, the functions of follicle cells during oocyte degeneration are associated with phagocytosis and theintracellular digestion of products. In this study, morphologically similar degenerated phagosomes (various lysosomes), whichwere observed in the degenerated oocytes, appeared in the follicle cells. After the spawning of the oocytes, the follicle cellswere involved in oocyte degeneration through phagocytosis by phagolysosomes. Therefore, it can be assumed that folliclecells reabsorb phagosomes from degenerated oocytes. In this study, the presence of lipid granules, which occurred fromdegenerating yolk granules, gradually increased in degenerating oocytes. The function of follicle cells can accumulatereserves of lipid granules and glycogen in the cytoplasm, which can be employed by the vitellogenic oocyte. Based onobservations of follicle cells attached to degenerating oocytes after spawning, the follicle cells of this species are involved inthe lysosomal induction of oocyte degeneration for the reabsorption of phagosomes (phagolysosomes) in the cytoplasm fornutrient storage, as seen in other bivalves.
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