A review on the effects of PBDEs on thyroid and reproduction systems in fish.

abstract：:Stress-induced inhibition of innate immune activity has been observed in a variety of wild birds and may increase chances of infection because this activity constitutes the first line of defense against pathogens. We previously reported that the transient elevation of plasma corticosterone (CORT; the primary avian glu...

journal_title：General and comparative endocrinology

authors： Gao S,Deviche PJ

更新日期：2019-05-01 00:00:00

abstract：:Serum cortisol levels were measured in a total of 73 tammar wallabies maintained in a captive population at Macquarie University, NSW, Australia. Previous studies of corticosteroids in marsupials have generally involved low sample numbers, a diverse array of analytical techniques, and a variety of sampling conditions....

journal_title：General and comparative endocrinology

authors： McKenzie S,Deane EM

更新日期：2003-10-01 00:00:00

abstract：:PACAP (pituitary adenylate cyclase activating polypeptide) is widely distributed neuropeptide acting via three subtypes of receptors, PAC(1), VPAC(1) and VPAC(2). Here we examined the localisation and nature of PACAP-immunoreactive nerves in the rat thyroid and parathyroid glands and defined the distribution of PAC(1)...

journal_title：General and comparative endocrinology

authors： Fahrenkrug J,Hannibal J

更新日期：2011-03-01 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：: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：:Using morpholino antisense oligonucleotide (MO) technology, we blocked leptin A or leptin receptor expression in embryonic zebrafish, and analyzed consequences of leptin A knock-down on fish development. Embryos injected with leptin A or leptin receptor MOs (leptin A or leptin receptor morphants) had smaller bodies an...

journal_title：General and comparative endocrinology

authors： Liu Q,Dalman M,Chen Y,Akhter M,Brahmandam S,Patel Y,Lowe J,Thakkar M,Gregory AV,Phelps D,Riley C,Londraville RL

更新日期：2012-09-15 00:00:00

abstract：:Unlike mammals, the goldfish is unique in having dopamine (DA) D1 receptors in the anterior pituitary. In this species, DA stimulates growth hormone (GH) release via D1 receptors coupled to the cAMP-dependent pathway. To further examine the postreceptor mechanisms of this novel pituitary DA D1 system, the role of extr...

journal_title：General and comparative endocrinology

authors： Wong AO,Van Goor F,Chang JP

更新日期：1994-06-01 00:00:00

abstract：:Plasma aldosterone concentrations were markedly elevated in chickens by the removal of 10-30% of their total blood volume. This aldosterone response to haemorrhage was delayed and of reduced magnitude in birds pretreated for 48 hr with dexamethasone (100 micrograms/kg every 12 hr), in which the basal aldosterone level...

journal_title：General and comparative endocrinology

authors： Radke WJ,Albasi CM,Harvey S

更新日期：1985-11-01 00:00:00

abstract：:Acute stress in vertebrates generally stimulates the hypothalamo-pituitary-adrenal axis and is often associated with multiple metabolic changes, such as increased gluconeogenesis, and with behavioral alterations. Little information is available, especially in free-ranging organisms, on the duration of these reversible...

journal_title：General and comparative endocrinology

authors： Deviche P,Bittner S,Davies S,Valle S,Gao S,Carpentier E

更新日期：2016-08-01 00:00:00

abstract：:Strong individual and life-history variation in serum glucocorticoids has been documented in many wildlife species. Less is known about variation in hypothalamic-pituitary-adrenal (HPA) axis responsiveness and its impact on metabolism. We challenged 18 free-ranging adult male northern elephant seals (NES) with an intr...

journal_title：General and comparative endocrinology

authors： Ensminger DC,Somo DA,Houser DS,Crocker DE

更新日期：2014-08-01 00:00:00

abstract：:In our previous in vitro studies, [Ac-delta 3-Pro1, 4FD-Phe2, D-Trp3,6]-mGnRH (analog E) suppressed both gonadotropin-II (GTH-II) and growth hormone (GH) release stimulated by sGnRH and cGnRH-II. In the present study analog E significantly inhibited the increases in plasma GTH-II levels stimulated by sGnRH in sexually...

journal_title：General and comparative endocrinology

authors： Murthy CK,Zheng W,Trudeau VL,Nahorniak CS,Rivier JE,Peter RE

更新日期：1994-12-01 00:00:00

abstract：:Thyroid stimulating hormone (TSH) is produced by the anterior pituitary and is used to regulate thyroid hormone output, which in turn controls metabolic activity. Currently, the pituitary is believed to be the only source of TSH used by the thyroid. Recent studies in mice from our laboratory have identified a TSHbeta ...

journal_title：General and comparative endocrinology

authors： Schaefer JS,Klein JR

更新日期：2009-07-01 00:00:00

abstract：:Over the last decade, field endocrinologists have explored the efficacy of using plasma corticosterone concentrations of breeding seabirds as an indicator of food availability and predictor of breeding success. However, studies have been predominately confined to adults and the results have been inconsistent. We exami...

journal_title：General and comparative endocrinology

authors： Brewer JH,O'Reilly KM,Dean Kildaw S,Loren Buck C

更新日期：2008-04-01 00:00:00

abstract：:Recent studies have revealed nesfatin-1 as a hypothalamic neuropeptide, regulating food intake, energy expenditure and reproduction primarily by acting on the hypothalamic-pituitary-gonadal axis. Nesfatin-1 is also localized in several peripheral tissues including testes. However, functional significance of nesfatin-1...

journal_title：General and comparative endocrinology

authors： Ranjan A,Choubey M,Yada T,Krishna A

更新日期：2019-01-15 00:00:00

abstract：:The actions of mammalian insulin-like growth factors (IGF-I and IGF-II) and insulin on skeletal growth of the axolotl, Ambystoma mexicanum, were examined by monitoring the in vitro uptake of [35S]sulfate by cartilage. Both growth factors stimulated sulfate uptake significantly at a concentration of 13 nM. The increase...

journal_title：General and comparative endocrinology

authors： Schneider A,Hanke W

更新日期：1996-10-01 00:00:00

abstract：:Several of the song control nuclei of songbirds, including HVc (higher vocal center) and Area X, contain melatonin receptor (MelR). In laboratory-housed male starlings, the densities of MelR in Area X change markedly according to reproductive state. MelR are down-regulated when starlings are photostimulated (in full b...

journal_title：General and comparative endocrinology

authors： Bentley GE

更新日期：2003-11-01 00:00:00

abstract：:Plasma prolactin (PRL) and vitellogenin (VTG) concentrations were determined during the annual reproductive cycle of the newt Triturus carnifex Laur. Plasma PRL was measured by a radioimmunoassay using purified newt (Cynops pyrrogaster) PRL as standard and radioligand and its antibodies. Using ELISA, plasma VTG titers...

journal_title：General and comparative endocrinology

authors： Mosconi G,Yamamoto K,Kikuyama S,Carnevali O,Mancuso A,Vellano C

更新日期：1994-09-01 00:00:00

abstract：:A protein with insulin-like effects was isolated from the hepatopancreas of the lobster Panulirus argus following a classic method for mammalian insulin purification from the pancreas. After acid-alcoholic extraction and ethanol-ether precipitation followed by molecular filtration chromatography, a protein with an app...

journal_title：General and comparative endocrinology

authors： Gallardo N,Carrillo O,Moltó E,Deás M,González-Suárez R,Carrascosa JM,Ros M,Andrés A

更新日期：2003-05-01 00:00:00

abstract：:Faecal glucocorticoid metabolite (fGCM) concentrations have been used to evaluate adrenal activity in a variety of species; including as an indicator of the physiological response to social stress. However, across studies, the relationships between dominance rank, social behaviours and adrenal responses can be inconsi...

journal_title：General and comparative endocrinology

authors： Edwards KL,Walker SL,Bodenham RF,Ritchie H,Shultz S

更新日期：2013-06-01 00:00:00

abstract：:Although elevated plasma cortisol levels and a reduction in food intake are common features of the response to stress in fish, the potential role of cortisol in the regulation of food intake in these animals is poorly understood. In this study, goldfish (Carassius auratus) were fed ad libitum for 21 days diets prepare...

journal_title：General and comparative endocrinology

authors： Bernier NJ,Bedard N,Peter RE

更新日期：2004-01-15 00:00:00

abstract：:Hormones play key, functional roles in mediating the tradeoff between survival and reproduction. Glucocorticoid hormones can inhibit reproduction and improve chances of survival during periods of stress. However, glucocorticoid hormones are, at times, also associated with successfully engaging in energetically costly ...

journal_title：General and comparative endocrinology

authors： Reedy AM,Edwards A,Pendlebury C,Murdaugh L,Avery R,Seidenberg J,Aspbury AS,Gabor CR

更新日期：2014-11-01 00:00:00

abstract：:Almost all physiological processes within the organism, including immune parameters and hormones, follow a circadian rhythm. These daily fluctuations are often observed in free-living organisms; however, little is known regarding hormonal and immune daily variations in anurans, particularly under laboratory conditions...

journal_title：General and comparative endocrinology

authors： Titon SCM,Titon Junior B,Assis VR,Vasconcelos-Teixeira R,Garcia Neto PG,Lima AS,Ferreira LF,Fernandes PA,Gomes FR,Markus RP

更新日期：2020-12-20 00:00:00

abstract：:Although present at relatively low number in the testis, spermatogonial stem cells (SSCs) are crucial for the establishment and maintenance of spermatogenesis in eukaryotes and, until recently, those cells were investigated in fish using morphological criteria. The isolation and characterization of these cells in fish...

journal_title：General and comparative endocrinology

authors： Lacerda SM,Costa GM,de França LR

更新日期：2014-10-01 00:00:00

abstract：:In the current study we describe the identification of novel leptin B homologous gene/s in the four salmonid species Atlantic salmon (Salmo salar), rainbow trout (Oncorhynchus mykiss), brown trout (Salmo trutta) and Arctic charr (Salvelinus alpinus). Homology modeling of Salmo salar (Ss) LepB1/B2 suggests that the pro...

journal_title：General and comparative endocrinology

authors： Angotzi AR,Stefansson SO,Nilsen TO,Rathore RM,Rønnestad I

更新日期：2013-06-15 00:00:00

abstract：:The total cortisol content in tilapia was 55 pg immediately following fertilization, then decreased abruptly and maintained a lower level of 10-20 pg until hatching; after hatching the cortisol content increased to 50 pg by the 7th day. Fertilized eggs were incubated in either 32% saltwater or fresh water and sampled ...

journal_title：General and comparative endocrinology

authors： Hwang PP,Wu SM

更新日期：1993-11-01 00:00:00

abstract：:The presence and distribution of cholecystokinin (CCK)/gastrin-like immunoreactivity (IR) was examined in the goldfish pituitary. Intense CCK/gastrin-like IR was consistently observed within fibers of the proximal pars distalis (PD), with fewer IR fibers localized in the rostral PD. Within the proximal PD CCK/gastrin-...

journal_title：General and comparative endocrinology

authors： Himick BA,Golosinski AA,Jonsson AC,Peter RE

更新日期：1993-10-01 00:00:00

abstract：:Effects of fasting on the growth hormone (GH)--growth hormone receptor (GHR)-insulin-like growth factor-I (IGF-I) axis were characterized in seawater-acclimated tilapia (Oreochromis mossambicus). Fasting for 4 weeks resulted in significant reductions in body weight and specific growth rate. Plasma GH and pituitary GH ...

journal_title：General and comparative endocrinology

authors： Fox BK,Riley LG,Hirano T,Grau EG

更新日期：2006-09-15 00:00:00

abstract：:Two aspects of hormonal control of aggressive territorial behavior in male mountain spiny lizards Sceloporus jarrovi were studied. First, testosterone (T) implants were given to free-living castrated males during the breeding season. These implants fully restored breeding season levels of aggressive and sexual behavio...

journal_title：General and comparative endocrinology

authors： Moore MC

更新日期：1988-06-01 00:00:00

abstract：:Kisspeptin is a potent regulator of the hypothalamo-pituitary-gonadal axis. The activation of several vernal and pubertal behaviors involves the action of locally synthesized estradiol by hypothalamic aromatase-expressing neurons. Little is known about kisspeptin in non-mammalian systems, and its interaction with arom...

journal_title：General and comparative endocrinology

authors： Saldanha CJ,Walters BJ,Fraley GS

更新日期：2010-05-01 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