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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 5
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Comparative distribution of somatostatin, LH-RH, neurophysin, and alpha-endorphin in rainbow trout: an immunocytological study Animal Physiology
Dubois, M.P.; Billard, R.; Breton, B.; Peter, R.E..
Using immunofluorescence, evidence of a somatostatin (SR1F)-like antigen has been found in the brain and digestive tract of rainbow trout. In the diencephalon, periventricular SRIF immunoreactive hypendymocytes are located in the region dorsal to the nucleus preopticus (NPO). SRIF immunoreactive perikarya are concentrated anterior to the NPO in the nucleus preopticus periventricularis, scattered in small cells in the nucleus lateralis tuberis (NLT) pars anterior, and in a few cells located in an unnamed nucleus in the dorsomedial hypothalamus. In the pituitary SRIF immunoreactive material is located in the neurohypophysial tissue in the proximal pars distalis. In the gut, SRIF cells have been found in the endocrine pancreas and in the gastric mucosa....
Tipo: Journal (Paginated) Palavras-chave: QP Physiology.
Ano: 1979 URL: http://phy043.tours.inra.fr:8080/archive/00000288/
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Effects of third ventricle injection of protaglandins on gonadotropin secretion in goldfish Carassius auratus Animal Physiology
Peter, R.E.; Billard, R..
The effects of injection of prostaglandin (PG) E1, PGE2, and PGF2alpha into the third ventricle on serum gonadotropin (GTH) concentrations in the goldfish were tested. Blood samples were taken at 30 min postinjection for radioimmunoassay of serum GTH. PG dosages of 0.5 and 1.0 microg were ineffective. However, PGE2 and PGF2alpha at the 2.0-microg dosage significantly suppressed serum GTH. PGE1 at a 2.0-microg dosage had no effect. There were no effects on serum GTH when 2.0 microg of PGE1, PGE2, or PGF2alpha were injected intraperitoneally. The results indicate that PGE2 and PGF2alpha suppress gonadotropin secretion by some action, presumably on the hypothalamus. However, action of PGE2 and PGF2alpha by diffusion from the site of injection to some other...
Tipo: Journal (Paginated) Palavras-chave: QP Physiology.
Ano: 1976 URL: http://phy043.tours.inra.fr:8080/archive/00000216/
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Gonadotropin release after implantation of anti-estrogens in the pituitary and hypothalamus of goldfish Carassius auratus Animal Physiology
Billard, R.; Peter, R.E..
Serum immunoreactive gonadotropin (GTH) levels were measured in sexually mature (gravid) female goldfish at 24 hr before and 24 and 72 hr after brain or pituitary stereotaxic implantation of either a blank pellet (cocoa butter only) or a pellet containing one of the anti-estrogens, clomiphene citrate or ICI 46474. Both pituitary implantation and implantation in the nucleus lateral tuberis (NLT) region of a pellet containing ICI 46474 caused a significant increase in serum GTH levels, with the former site having a more pronounced effect. Implantation of ICI 46474 in the nucleus preopticus (NPO) region, the posterodorsal hypothalamus, or the optic tectum (OT) had no significant effects on serum GTH. Implantation of clomiphene citrate in the pituitary caused...
Tipo: Journal (Paginated) Palavras-chave: QP Physiology.
Ano: 1977 URL: http://phy043.tours.inra.fr:8080/archive/00000188/
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Onset of gonadotropic hormone accumulation in the immature trout pituitary gland in response to estrogen or aromatizable androgen steroid hormones Animal Physiology
Crim, L.W.; Peter, R.E.; Billard, R..
A study was conducted to determine the specificity of the steroids able to cause a stimulation of pituitary gonadotropic hormone (GtH) levels in sexually immature rainbow trout. Low pituitary GtH levels characteristic of juvenile trout were rapidly elevated following treatment with estrogen and aromatizable androgenic steroid hormones, but nonaromatizable androgens and progestogenic steroids were ineffective. An aromatase inhibitor, 1,4,6- androstatrien-3,17-dione, significantly reduced the pituitary GtH increase in response to treatment with testosterone. A central effect of steroid hormones on pituitary GtH was confirmed by the fact that pituitary steroid implants did not increase liver weight as observed after perivisceral hormone treatment. The...
Tipo: Journal (Paginated) Palavras-chave: QP Physiology.
Ano: 1981 URL: http://phy043.tours.inra.fr:8080/archive/00000374/
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Stimulation of gonadotropin secretion by intraventricular injection of hypothalamic extracts in the goldfish Carassius auratus Animal Physiology
Crim, L.W.; Peter, R.E.; Billard, R..
Goldfish serum gonadotropin (GTH) concentrations were determined by radioimmunoassay 20 min after injection of goldfish brain extracts or synthetic luteinizing hormone-releasing hormone (LH-RH) into the third ventricle in the ventrobasal hypothalamic region. Extracts of the cerebellum and medulla were ineffective. Synthetic LH-RH, and extract of the lateral hypothalamus each significantly increased plasma GTH levels. The results indicate that the hypothalamus of the sexually mature female goldfish contains gonadotropin releasing hormone activity, and that releasing hormone is effective when administered via the intrahypothalamic route.
Tipo: Journal (Paginated) Palavras-chave: QP Physiology.
Ano: 1976 URL: http://phy043.tours.inra.fr:8080/archive/00000212/
Registros recuperados: 5
Primeira ... 1 ... Última
 

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