title: A glycoprotein from the liver constitutes the inner layer of the egg envelope (zona pellucida interna) of the fish, Oryzias latipes.
abstract: A glycoprotein from the liver, which shares epitopes with chorion (egg envelope or zona pellucida) glycoproteins, is present only in the spawning female fish, Oryzias latipes, under natural conditions. This spawning female-specific (SF) substance is distinct from vitellogenin but closely resembles a major glycoprotein component, ZI-3, of the inner layer (zona radiata interna) of the ovarian egg envelope with respect to some biochemical and immunochemical characteristics. Here we report that the [125I]SF substance, injected into the abdominal cavity of the spawning female fish, was rapidly transported by the blood circulation into the ovary and incorporated into the inner layer of egg envelope of the growing oocytes. The result strongly suggests that the SF substance from the liver is a precursor substance of the major component, ZI-3, of the inner layer of egg envelope in the fish.
authors: Life Science Institute, Sophia University, Tokyo, Japan.
authors: T S
authors: TS
authors: Hamazaki
authors: Y
authors: Y
authors: Nagahama
authors: I
authors: I
authors: Iuchi
authors: K
authors: K
authors: Yamagami
mesh_terms: D000818:Animals; D001345:Autoradiography; D003532:Cyprinodontiformes / Q000378:metabolism*; D003593:Cytoplasm / Q000378:metabolism; D005260:Female; D006023:Glycoproteins / Q000378:metabolism*; D007457:Iodine Radioisotopes; D008099:Liver / Q000032:analysis* / Q000378:metabolism; D008297:Male; D009865:Oocytes / Q000378:metabolism / Q000648:ultrastructure; D009990:Oryzias / Q000378:metabolism*; D010053:Ovary / Q000378:metabolism; D010063:Ovum / Q000378:metabolism*; D011498:Protein Precursors / Q000378:metabolism; D013194:Staining and Labeling; D014048:Tolonium Chloride; D015044:Zona Pellucida / Q000378:metabolism*
chemical_list: D006023:Glycoproteins; D007457:Iodine Radioisotopes; D011498:Protein Precursors; D014048:Tolonium Chloride