abstract：:Vertebrate reproduction is tightly regulated by conserved glycoprotein hormones produced by the pituitary gland. Follicle-stimulating hormone (FSH) in tetrapods and gonadotropic hormone I (GTH-I) in fishes are orthologous glycoprotein hormones that control the timing of egg production and the number of eggs produced. ...

journal_title：General and comparative endocrinology

authors： Laan M,Richmond H,He C,Campbell RK

更新日期：2002-02-15 00:00:00

abstract：:The corticosterone response to the sight of a natural predator was investigated in free-living and captive great tits (Parus major). Free-living great tits responded to the sight of a stuffed, slowly moving Tengmalm's owl, a major predator of great tits, with warning calls and a change in behaviour around a feeder. Gr...

journal_title：General and comparative endocrinology

authors： Cockrem JF,Silverin B

更新日期：2002-02-01 00:00:00

abstract：:The distribution of the cannabinoid CB1 receptor and its relationships with individual endocrine cell types were investigated by immunohistochemistry in the anterior lobe of the Xenopus adenohypophysis. By use of a specific primary antibody raised in rabbit against the amino terminus of the rat CB1, we have found nume...

journal_title：General and comparative endocrinology

authors： Cesa R,Guastalla A,Cottone E,Mackie K,Beltramo M,Franzoni MF

更新日期：2002-01-01 00:00:00

abstract：:Plasma concentrations and stored levels of the neuroendocrine peptides arginine vasotocin (AVT) and urotensin II (UII) were measured in the euryhaline flounder (Platichthys flesus) following the acute hypo-osmotic challenge of direct seawater (SW) to fresh water (FW) transfer. Hormone measures, plasma osmolality, and ...

journal_title：General and comparative endocrinology

authors： Bond H,Winter MJ,Warne JM,McCrohan CR,Balment RJ

更新日期：2002-01-01 00:00:00

abstract：:Gonadotropin-releasing hormone (GnRH) of vertebrates is now believed to have multiple functions in addition to its role as a hypophysiotropic hormone, as originally defined. Recently, it has been shown that GnRH occurs also in the ascidians, which are considered ancestral chordates. Here the author shows that GnRH ind...

journal_title：General and comparative endocrinology

authors： Terakado K

更新日期：2001-12-01 00:00:00

abstract：:Glucagon plays a pivotal role in the regulation of metabolism. A glucagon receptor has been previously characterized in the frog, Rana tigrina rugulosa, and the frog and human glucagon receptors have been shown to possess similar binding affinities toward human glucagon. To study the structural evolution of glucagon p...

journal_title：General and comparative endocrinology

authors： Yeung CM,Chow BK

更新日期：2001-11-01 00:00:00

abstract：:The ontogeny of gonadotropin 1 (GtH1) and 2 (GtH2) cells and its possible link to gonadal sex differentiation were studied in pejerrey, Odontesthes bonariensis, by immunocytochemistry using anti-chum salmon beta-GtH1 and beta-GtH2 antisera. In adults, GtH1 cells were found in the proximalis pars distalls (PPD) close t...

journal_title：General and comparative endocrinology

authors： Miranda LA,Strüssmann CA,Somoza GM

更新日期：2001-10-01 00:00:00

abstract：:Expression of the tilapia prolactin receptor (tiPRL-R) has been characterized in the intestine of Oreochromis niloticus and the levels of both tiPRL-R transcripts and tiPRL binding sites have been further analyzed in this organ, as well as in gill and kidney, during adaptation of tilapia to a hyperosmotic environment....

journal_title：General and comparative endocrinology

authors： Sandra O,Le Rouzic P,Rentier-Delrue F,Prunet P

更新日期：2001-09-01 00:00:00

abstract：:The effects of thyroid hormone on the production of vitamin A(2) retinoids from vitamin A(1) precursor were investigated in retinal pigmented epithelial (RPE) cells obtained from juvenile coho salmon. Specifically, changes in the production of both the storage and the free forms of radiolabeled 3,4-didehydroretinoids ...

journal_title：General and comparative endocrinology

authors： Alexander G,Sweeting R,McKeown BA

更新日期：2001-08-01 00:00:00

abstract：:The aim of this study was to identify the major C21 steroids produced in vivo during artificially induced final oocyte maturation and spawning in female common dentex (Dentex dentex). During the spawning season, mature females were treated with a gonadotropin-releasing hormone agonist (GnRHa)-loaded delivery system, w...

journal_title：General and comparative endocrinology

authors： Greenwood LN,Scott AP,Vermeirssen EL,Mylonas CC,Pavlidis M

更新日期：2001-07-01 00:00:00

abstract：:A clone encoding thyroid hormone receptor-beta (TR-beta) was isolated from a sea bream (Sparus aurata) ovary cDNA library. Sea bream (sb)TR-beta is closely related to its counterparts from other vertebrates and, like them, preferentially binds T3 rather than T4. However, the putative sbTR-beta protein contains a nine-...

journal_title：General and comparative endocrinology

authors： Nowell MA,Power DM,Canario AV,Llewellyn L,Sweeney GE

更新日期：2001-07-01 00:00:00

abstract：:Application of alpha-MSH immunohistochemistry to the brain of elasmobranchs (Scyliorhinus torazame and Etmopterus brachyurus) demonstrated a marked species difference concerning the distribution of the alpha-MSH-like molecule in the brain. In S. torazame, alpha-MSH-like immunoreactive cells were present in the hypotha...

journal_title：General and comparative endocrinology

authors： Chiba A

更新日期：2001-06-01 00:00:00

abstract：:Insulin and IGF-I binding has been studied in brown trout (Salmo trutta) wheat germ agglutinin semipurified receptors from embryos (organogenesis), larvae (yolk sac), juveniles (2.98 +/- 0.21 g bw) and adults (111.6 +/- 6.92 and 522 +/- 53 g bw). Embryos and larvae were sampled at 5 and 12 weeks after fertilization (D...

journal_title：General and comparative endocrinology

authors： Méndez E,Smith A,Figueiredo-Garutti ML,Planas JV,Navarro I,Gutiérrez J

更新日期：2001-05-01 00:00:00

abstract：:The courtship behavior of the male ring dove (Streptopelia risoria) combines aggressive displays (chasing, bowing) and nest-oriented displays (nest soliciting). Aggressive displays depend on circulating testosterone, whereas nest soliciting is estrogen-dependent and appears to depend on the aromatization of androgen i...

journal_title：General and comparative endocrinology

authors： Fusani L,Gahr M,Hutchison JB

更新日期：2001-04-01 00:00:00

abstract：:To study the effects of glucocorticoids and IGF-I on the modulation of growth in the tilapia Oreochromis mossambicus, we employed an epiceratobranchial cartilage radioisotope incorporation assay, wherein radiolabeled sulfate and thymidine uptakes are measured in vitro to indicate proteoglycan synthesis and cell prolif...

journal_title：General and comparative endocrinology

authors： Datuin JP,Ng KP,Hayes TB,Bern HA

更新日期：2001-03-01 00:00:00

abstract：:The fushi tarazu factor 1 (FTZ-F1) gene family constitutes a subgroup of orphan nuclear receptors which can be divided into two groups (LRH/FTF- and SF-1/Ad4BP-like) based on sequence homology, function, and tissue distribution. Analysis of zebrafish FTZ-F1 homologues (zFF1 and ff1b) during embryogenesis indicated dis...

journal_title：General and comparative endocrinology

authors： von Hofsten J,Jones I,Karlsson J,Olsson PE

更新日期：2001-02-01 00:00:00

abstract：:This study was conducted at the Bukhara breeding centre (Ouzbekistan, Central Asia) on Persian gazelles (Gazella subgutturosa subgutturosa) and at Thumammah (Saudi Arabia) on sand gazelles (Gazella subgutturosa marica). Plasma prolactin (PRL) and progesterone were determined in groups of females. Because these females...

journal_title：General and comparative endocrinology

authors： Sempéré AJ,Brown N,Pereladova OB,Bahloul K,Lacroix A,Soldatova N

更新日期：2001-01-01 00:00:00

abstract：:The binding characteristics of sex steroid binding protein (SBP) were investigated in vitellogenic and nonreproductive female rainbow trout (Oncorhynchus mykiss), black bream (Acanthopagrus butcheri), and greenback flounder (Rhombosolea tapirina). The binding capacity of rainbow trout and black bream SBP was significa...

journal_title：General and comparative endocrinology

authors： Hobby AC,Geraghty DP,Pankhurst NW

更新日期：2000-12-01 00:00:00

abstract：:Insulin, glucagon, somatostatin-14, and three structurally related molecular forms of peptide tyrosine-tyrosine (PYY) were isolated from an extract of the combined pancreas and gastrointestinal tract of the pallid sturgeon, Scaphirhynchus albus. Pallid sturgeon insulin was identical to insulin from the Russian sturgeo...

journal_title：General and comparative endocrinology

authors： Kim JB,Gadsbøll V,Whittaker J,Barton BA,Conlon JM

更新日期：2000-12-01 00:00:00

abstract：:Testicular maturation of underyearling precocious male masu salmon (Oncorhynchus masou) is affected by photoperiod. It is accelerated by a short photoperiod (light-dark cycles of 8:16 h; LD 8:16) and delayed by a long photoperiod (LD 16:8). Circulating melatonin levels are high during the night and low during the day:...

journal_title：General and comparative endocrinology

authors： Amano M,Iigo M,Ikuta K,Kitamura S,Yamada H,Yamamori K

更新日期：2000-11-01 00:00:00

abstract：:Using combined nicotinamide adenine dinucleotide phosphate-diaphorase (NADPHd) histochemistry and salmon gonadotropin-releasing hormone (sGnRH) immunocytochemistry, it is reported for the first time that possible potential contacts occur between the nitric oxide (NO)- and the GnRH-containing neurons in the brain of a ...

journal_title：General and comparative endocrinology

authors： Baby SM,Ueck M,Prasada Rao PD

更新日期：2000-10-01 00:00:00

abstract：:Transthyretin (TTR) is responsible for a major part of the binding of thyroid hormone to proteins in the plasma in amphibian tadpoles. To characterize the binding properties of amphibian TTRs, the effects of 17 hydrophobic signaling molecules, including 6 endocrine disruptors, on 3,5,3'-l-[(125)I]triiodothyronine ([(1...

journal_title：General and comparative endocrinology

authors： Yamauchi K,Prapunpoj P,Richardson SJ

更新日期：2000-09-01 00:00:00

abstract：:Gonadal sex in the red-eared slider turtle is determined by the incubation temperature that the embryo experiences during the mid-trimester of development. High temperatures result in female-biased sex ratios, and low temperatures produce male-biased sex ratios. The physiological equivalent of temperature appears to b...

journal_title：General and comparative endocrinology

authors： Willingham E,Baldwin R,Skipper JK,Crews D

更新日期：2000-08-01 00:00:00

abstract：:We investigated the seasonal and daily variation in plasma glucose levels in response to stress in captive wild starlings. Starlings were captured from the wild during the winter, held on short days (11L:13D, mimicking winter), and then shifted to long days (19L:5D, mimicking summer). Birds were maintained on long day...

journal_title：General and comparative endocrinology

authors： Remage-Healey L,Romero LM

更新日期：2000-07-01 00:00:00

abstract：:The effects of starvation and feeding on the release of bombyxin, a peptide of insulin superfamily in insects, from the larval brain of the silkworm Bombyx mori were investigated. Following starvation, the bombyxin titer in the hemolymph of larvae decreased, whereas its content in the brain increased. On the other han...

journal_title：General and comparative endocrinology

authors： Masumura M,Satake S,Saegusa H,Mizoguchi A

更新日期：2000-06-01 00:00:00

abstract：:The importance of late winter pairing activity on the neuroendocrinology of wild waterfowl is unknown. In this study, we examined the sex-related differences in the roles of late winter pairing activity and seasonal influences on neuroendocrine and reproductive physiology in both male and female mallards. Our main goa...

journal_title：General and comparative endocrinology

authors： Bluhm CK,Rozenboim I,Silsby J,El Halawani M

更新日期：2000-05-01 00:00:00

abstract：:An earlier study reported that blinding or exposure to red light stimulates reproduction in R. cyanophlyctis. The present study investigates whether melatonin counteracted blinding- or red-light-induced ovarian stimulation. The study consisted of two experiments carried out during the prebreeding (March/April) and bre...

journal_title：General and comparative endocrinology

authors： Joshi BN,Udaykumar K

更新日期：2000-04-01 00:00:00

abstract：:The in vivo actions of human and fish insulin-like growth factor (IGF)-I have been compared to extend the understanding of the metabolism of IGFs in fish and to identify potential differences in their actions. The effects of acute administration of these proteins on the incorporation of glucose into muscle glycogen an...

journal_title：General and comparative endocrinology

authors： Degger B,Upton Z,Soole K,Collet C,Richardson N

更新日期：2000-03-01 00:00:00

abstract：:In this study, parathyroid hormone (PTH) receptor binding was examined in the membrane fraction of the endometrium of the shell gland of laying and nonlaying hens by the use of (125)I-PTH-related peptide (PTHrP) binding assays. Specific (125)I-PTHrP binding was found in the endometrium of the shell gland and increased...

journal_title：General and comparative endocrinology

authors： Ieda T,Takahashi T,Saito N,Yasuoka T,Kawashima M,Shimada K

更新日期：2000-02-01 00:00:00

abstract：:Vasotocin (VT) and vasopressin control many endocrine and neuroendocrine functions, including the regulation of reproductive behaviors. In the roughskin newt (Taricha granulosa), VT administration can enhance courtship behaviors in males and egg-laying behaviors in females. This study used immunohistochemistry to inve...

journal_title：General and comparative endocrinology

authors： Moore FL,Richardson C,Lowry CA

更新日期：2000-02-01 00:00:00

abstract：:In seasonally breeding, photoperiodic birds, the development of photorefractoriness is associated with decreased brain expression of gonadotropin-releasing hormone-like immunoreactivity (GnRH-li ir) and increased expression of vasoactive intestinal polypeptide-like immunoreactivity (VIP-li ir). Dissipation of photoref...

journal_title：General and comparative endocrinology

authors： Deviche P,Saldanha CJ,Silver R

更新日期：2000-01-01 00:00:00

abstract：:Prolactin (PRL) and two variants of growth hormone (GH), purified from pituitaries of striped bass (Morone saxatilis) and its hybrid with white bass (M. saxatilis x M. chrysops) by gel filtration chromatography under alkaline conditions followed by reversed-phase high pressure liquid chromatography, appear similar bet...

journal_title：General and comparative endocrinology

authors： Jackson LF,Swanson P,Duan C,Fruchtman S,Sullivan CV

更新日期：2000-01-01 00:00:00

abstract：:Plasma levels of testosterone and corticosterone were measured in free-living male bush warblers captured on their breeding ground at different times of the breeding season. Their territoriality was also estimated from their singing response to song playbacks. The pattern of change detected in the levels of plasma tes...

journal_title：General and comparative endocrinology

authors： Wada M,Shimizu T,Kobayashi S,Yatani A,Sandaiji Y,Ishikawa T,Takemure E

更新日期：1999-12-01 00:00:00

abstract：:We investigated the development of thyroid function during the transition to endothermy in red-winged blackbirds (Agelaius phoeniceus). Thermoregulatory capabilities of blackbirds improve markedly over their relatively short nestling period (10-12 days), with the most striking improvements occurring between days 6 and...

journal_title：General and comparative endocrinology

authors： Olson JM,McNabb FM,Jablonski MS,Ferris DV

更新日期：1999-11-01 00:00:00

abstract：:Our previous study showed the seasonal variations in expression of vasotocin (VT) and isotocin (IT) genes in preoptic magnocellular neurons of female masu salmon (Oncorhynchus masou). The changes in the level of VT mRNA were coincident with those in plasma testosterone and estradiol levels. In the present study, gener...

journal_title：General and comparative endocrinology

authors： Ota Y,Ando H,Ueda H,Urano A

更新日期：1999-10-01 00:00:00

abstract：:We studied the hepatic in vitro deconjugation and deiodination of glucuronide (G) and sulfate (S) conjugates of the thyroid hormones (TH) thyroxine (T(4)), 3,5,3'-triiodothyronine (T(3)), and 3,3', 5'-triiodothyronine (rT(3)) in trout. These conversions have not been studied in nonmammals. Deconjugation of T(4)G, T(3)...

journal_title：General and comparative endocrinology

authors： Finnson KW,McLeese JM,Eales JG

更新日期：1999-09-01 00:00:00

abstract：:In bony fishes, both corticotropin-releasing factor (CRF) and urotensin-I play a role in the regulation of interrenal glucocorticoid release. The rainbow trout, Oncorhynchus mykiss, is a useful model for understanding the mechanisms of stress and the hypothalamo-pituitary-interrenal axis because of its phylogenetic po...

journal_title：General and comparative endocrinology

authors： Barsyte D,Tipping DR,Smart D,Conlon JM,Baker BI,Lovejoy DA

更新日期：1999-08-01 00:00:00

abstract：:The insulin-like growth factor (IGF) system in teleosts consists of two ligands, IGF-I and IGF-II, multiple binding proteins, and high-affinity transmembrane receptors. There exists a large gap in our knowledge of the structure and expression of receptors mediating the biological effects of the IGFs in teleosts. For e...

journal_title：General and comparative endocrinology

authors： Greene MW,Chen TT

更新日期：1999-08-01 00:00:00

abstract：:The relationships between testicular and plasma hormone levels and the decline in fertility in aging roosters were examined. Body mass, testicular mass, and fertility were measured in roosters from 20 to 72 weeks of age. Plasma was assayed for LH and testosterone, and estradiol and testicular extracts were assayed for...

journal_title：General and comparative endocrinology

authors： Weil S,Rozenboim I,Degen AA,Dawson A,Friedländer M,Rosenstrauch A

更新日期：1999-07-01 00:00:00

abstract：:Acute pancreatic hormonal responses to oral glucose loads were investigated in garden warblers during the prolonged fast that follows their autumnal migratory fattening. Plasma glucose, free fatty acids, beta-hydroxybutyrate, insulin (INS), and glucagon (GLN) were measured prior to and 10 min after an oral glucose loa...

journal_title：General and comparative endocrinology

authors： Totzke U,Hübinger A,Korthaus G,Bairlein F

更新日期：1999-07-01 00:00:00