Search results for "Vitellogenin"

showing 3 items of 33 documents

The non-appearance of female-specific proteins in male Spilostethus pandurus)

1990

1. 1. Female-specific peptides can be detected by SDS-PAGE in the haemolymph when the female insects are 48 hr old. 2. 2. The age of the male insect at the moment of treatment with juvenile hormone I (JH I), JH III or ecdysone has no influence on the induction of the female-specific bands in male S. pandurus. 3. 3. Male insects exposed to the hormones for periods of time longer than 24 hr were also unable to show female-specific bands in their haemolymph. Consecutive treatments with JH were unable to induce these peptides in the males.

medicine.medical_specialtybiologyPhysiologymedia_common.quotation_subjectfungiGeneral MedicineInsectLygaeidaebiology.organism_classificationBiochemistryVitellogeninchemistry.chemical_compoundEndocrinologychemistrySpilostethus pandurusInternal medicineJuvenile hormoneHemolymphmedicinebiology.proteinMolecular BiologyEcdysoneHormonemedia_commonComparative Biochemistry and Physiology Part B: Comparative Biochemistry
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Identification of the yolk receptor protein in oocytes of Nereis virens (Annelida, Polychaeta) and comparison with the locust vitellogenin receptor

1992

In oviparous animals large amounts of yolk proteins of extraovarian origin are accumulated by developing oocytes during vitellogenesis. The yolk protein precursors, the vitellogenins (VTG), are transported into the oocytes by receptor-mediated endocytosis. In oocytes of the polychaetous annelid, Nereis virens, the receptor protein for VTG was visualized by ligand blotting studies as a protein with an apparent molecular mass of 190 kDa under non-reducing conditions. Anti-Locusta VTG receptor antibodies recognize the Nereis VTG receptor protein. The Nereis VTG receptor protein binds Locusta and Schistocerca VTG; the VTG receptor proteins of both locust species bind the Nereis vitellin. These …

medicine.medical_specialtyfood.ingredientbiologyPhysiologybiology.organism_classificationBiochemistryVitellogeninEndocrinologyfoodEndocrinologyBiochemistryInternal medicineYolkbiology.proteinmedicineAnimal Science and ZoologySchistocercaVitellogenesisReceptorVitellogeninsNereisEcology Evolution Behavior and SystematicsLocustJournal of Comparative Physiology B
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Wood-derived estrogens: studies in vitro with breast cancer cell lines and in vivo in trout.

1996

The wood-derived compound, beta-sitosterol (purity > 90%), was shown to be estrogenic in fish. It induced the expression of the vitellogenin gene in the liver of juvenile and methyltestosterone-treated rainbow trout. Structural similarities to beta-sitosterol notwithstanding, cholesterol, citrostadienol, beta-sitostanol, and 5-androstene-3 beta,17 beta-diol, an estrogenic member of the androstenic steroid group, were inactive. An abietic acid mixture (37% abietic acid, 6% dehydroabietic acid, and a remainder of unknown compounds) showed slight hormonal activity in feed, but it was completely inactive when given intraperitoneally in implants. The estrogenic component of the abietic acid prep…

medicine.medical_specialtymedicine.drug_classIsorhapontigeninPinosylvinEstrogen receptorGene ExpressionBreast NeoplasmsToxicologyVitellogeninchemistry.chemical_compoundVitellogeninsInternal medicinemedicineTumor Cells CulturedBioassayAnimalsHumansAbietic acidPharmacologyBetulinbiologyPhytosterolsEstrogensBlotting NorthernWoodEndocrinologychemistryEstrogenOncorhynchus mykissbiology.proteinRNACell DivisionWater Pollutants ChemicalToxicology and applied pharmacology
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