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Effect of genistein-enriched diets on the endocrine process of gametogenesis and on reproduction efficiency of the rainbow trout Oncorhynchus mykiss ArchiMer
Bennetau Pelissero, Catherine; Breton, Bernard; Bennetau, Bernard; Corraze, Genevieve; Le Menn, Françoise; Davail Cuisset, Blandine; Helou, Chantal; Kaushik, Sadasivam.
Three practical diets were formulated to contain 0, 500, or 1000 ppm genistein. The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of beta FSH and beta LH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 +/- 0.39 to 1.47 +/- 0.23 for beta FSH and from 0.44 +/- 0.09 to 0.31 +/- 0.09 for beta LH). There was a significantly reduced 17...
Tipo: Text Palavras-chave: Diet; Reproduction; GTH; Vitellogenin; Steroid; Trout; Genistein.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-738.pdf
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Homologous ELISA procedure for the determination of penaeid shrimp vitellogenin ArchiMer
Mendoza, Roberto; Guillaume, Jean-charles; Fauvel, Christian.
Vitellogenin (VTG) was isolated from the haemolymph of Penaeus vannamei by a three step procedure including ultracentrifugation, gel filtration and ion exchange chromatography. VTG was used to raise polyclonal antibodies that were purified by ion exchange chromatography. A two step competitive assay was developed in which VTG could be quantitated by its capacity to inhibit the binding of antibody to the VTG previously adsorbed onto a solid phase. Sensitivity from equilibrium and from non-equilibrium assays was 41 and 2.3 ng/ml respectively. Estimates of within-assay and between-assay variabilities of standard curves were 4.2 and 9.6% respectively. The inhibition curves for dilutions of haemolymph from vitellogenic females, egg yolk extracts and purified...
Tipo: Text Palavras-chave: Pénéidé; Vitellogénine; Vitelline; Immuno-essai (ELISA); Anticorps; Penaeid; Vitellogenin; Vitellin; Immunoassay (ELISA); Antibody.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00188/29894/28333.pdf
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Protein content and electrophoretic profile of fat body and ovary extracts from workers of Melipona quadrifasciata anthidioides (Hymenoptera, Meliponini) Iheringia, Sér. Zool.
Oliveira,Vagner T. Paes de; Cruz-Landim,Carminda da.
Workers of Melipona quadrifasciata anthidioides (Lepeletier, 1836) develop their ovaries and lay eggs, therefore the production of vitellogenin is expected. In electrophoretic profiles only fat body extracts from nurse workers and ovary extracts from newly-emerged workers show protein with molecular mass similar to vitellogenin. However, an increase in the protein content was detected in forager fat body. This increase was attributed to storage of vitellogenin or other proteins in the previous phase and not discharged into the hemolymph or to an effect of the increased titre of juvenile hormone in this phase of worker life over the fat body functioning.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stingless bees; Fat body; Ovary; Vitellogenin; Oogenesis.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000400010
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