The stimulatory and inhibitory effects of dopamine on prolactin secretion in the turkey.

abstract：:Thyroxine (T(4)) and triiodothyronine (T(3)), the principal thyroid hormones (THs) secreted from the hypothalamic-pituitary-thyroid (HPT) axis, produce a plethora of physiologic actions in fish. The diverse actions of THs in fishes are primarily due to the sensitivity of thyroid axis to many physical, chemical and bio...

journal_title：General and comparative endocrinology

authors： Peter MC

更新日期：2011-06-01 00:00:00

abstract：:The effect of aldosterone and corticosterone on T3 binding to the nuclear fraction of the tail fin of bullfrog tadpoles was investigated in vitro. Both corticoids (10(-7) - 10(-5) M) added to the incubation medium increased T3 binding in a dose-dependent manner. The aldosterone-induced increase in T3-binding was block...

journal_title：General and comparative endocrinology

authors： Suzuki MR,Kikuyama S

更新日期：1983-11-01 00:00:00

abstract：:Pituitary cells were prepared by enzymatic dispersion and incubated in vitro. To observe the effect of gonadotropin releasing hormone (GnRH) and Ca2+ on the murrel pituitary cyclic 3',5'-AMP (cAMP), cells were dispersed by 0.3% collagenase plus 0.05% trypsin in Earle's minimum essential medium without Ca2+ and a consi...

journal_title：General and comparative endocrinology

authors： Mukhopadhyay B,Biswas R,Bhattacharya S

更新日期：1995-03-01 00:00:00

abstract：:Human and wildlife are exposed at critical periods of development to endocrine disruptor chemicals (EDC) that may be responsible for reproductive disorders. To test the hypothesis that in ovum exposure to EDC at a critical period for gonadal organogenesis alters post-hatching folliculogenesis and steroidogenesis in Ca...

journal_title：General and comparative endocrinology

authors： Stoker C,Beldoménico PM,Bosquiazzo VL,Zayas MA,Rey F,Rodríguez H,Muñoz-de-Toro M,Luque EH

更新日期：2008-05-01 00:00:00

abstract：:To better understand the role(s) of progesterone in fish spermatogenesis, we cloned the nuclear progesterone receptor (Pgr) of Atlantic cod. The open-reading frame of the cod pgr consists of 2076 bp, coding for a 691-amino acids-long protein that shows the highest similarity with other piscine Pgr proteins. Functional...

journal_title：General and comparative endocrinology

authors： Chen SX,Almeida FF,Andersson E,Taranger GL,Schmidt R,Schulz RW,Bogerd J

更新日期：2012-10-01 00:00:00

abstract：:Saline extracts of the corpus cardiacum (CC) of Locusta migratoria activate glycogen phosphorylase in locust fat body. The response of phosphorylase to CC extracts and to synthetic adipokinetic hormone (AKH) suggests that the factor responsible for the activating effect of the CC on phosphorylase is AKH, supplemented ...

journal_title：General and comparative endocrinology

authors： Van Marrewijk WJ,Van den Broek AT,Beenakkers AM

更新日期：1983-05-01 00:00:00

abstract：:Growing evidence shows that sex steroids not only act within the individual whose glands produce them; they can also act on proximate conspecifics. Previous studies show that exogenous 17β-estradiol (E2) can be absorbed both nasally and percutaneously, arriving in blood, neural, reproductive, and peripheral tissues. W...

journal_title：General and comparative endocrinology

authors： Greville LJ,Pollock T,Faure PA,deCatanzaro D

更新日期：2020-01-15 00:00:00

abstract：:Differential transfer of maternal testosterone (T) into egg yolk provides a means of adjusting an offspring's phenotype to ambient environmental conditions. While the environmental and genetic driven variability in yolk T levels is widely described, the underlying mechanisms are poorly understood. Here, we investigate...

journal_title：General and comparative endocrinology

authors： Okuliarova M,Meddle SL,Zeman M

更新日期：2018-01-15 00:00:00

abstract：:The complete amino acid sequences of alpha subunits of chum salmon (Oncorhynchus keta) gonadotropins (GTHs), GTH I and GTH II, were determined. Subunits were separated by reversed-phase high-performance liquid chromatography. Two alpha subunits, I alpha 1 and I alpha 2, were obtained from GTH I, whereas only one alpha...

journal_title：General and comparative endocrinology

authors： Itoh H,Suzuki K,Kawauchi H

更新日期：1990-04-01 00:00:00

abstract：:A gonadotropin-releasing hormone (GnRH) agonist, d-Trp6-LHRH, was evaluated for its effectiveness in reducing circulating testosterone concentrations in wild Hawaiian monk seals (Monachus schauinslandi). Twenty-eight adult male seals were randomly divided into three groups: 10 were captured and treated with 7.5 mg of ...

journal_title：General and comparative endocrinology

authors： Atkinson S,Ragen TJ,Gilmartin WG,Becker BL,Johanos TC

更新日期：1998-11-01 00:00:00

abstract：:This study directly tested the hypothesis that 17 alpha,20 beta-dihydroxy-4-pregnen-3-one (17,20 beta-P) is a goldfish preovulatory pheromone (pheromone released at peak levels during oocyte final maturation) which increases blood gonadotropin (GtH) and milt volume in males. During spontaneous ovulation, GtH and 17,20...

journal_title：General and comparative endocrinology

authors： Stacey NE,Sorensen PW,Van der Kraak GJ,Dulka JG

更新日期：1989-07-01 00:00:00

abstract：:The titer of juvenile hormone (JH), which has wide ranging physiological effects in insects, is regulated in part by JH esterase (JHE). We show that overexpression in Drosophila melanogaster of the JHE binding protein, DmP29 results in a series of apparent anti-JH effects. We hypothesize that DmP29 functions in transp...

journal_title：General and comparative endocrinology

authors： Liu Z,Li X,Prasifka JR,Jurenka R,Bonning BC

更新日期：2008-03-01 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：:Gonadotrophin-releasing hormone (GnRH) is primarily related to reproductive processes in vertebrates. However other physiological roles, including functions in food intake regulation and energy status, have been demonstrated for GnRH in animals. The ten amino acid active peptide is relatively conserved throughout chor...

journal_title：General and comparative endocrinology

authors： Tuziak SM,Volkoff H

更新日期：2013-04-01 00:00:00

abstract：:In the last two decades, maternally derived yolk androgens have been shown to significantly alter offspring development, and a number of these effects persist into adulthood. However, little is known about their underlying mechanisms. Mechanisms that have been suggested are changes in the endogenous androgen productio...

journal_title：General and comparative endocrinology

authors： Vergauwen J,Groothuis TG,Eens M,Müller W

更新日期：2014-01-01 00:00:00

abstract：:Genetic sex determination leads to gonadal differentiation and ultimately the differences between the sexes in steroid hormone secretion. Gonadal steroidogenesis is critical for the development of a sexually dimorphic phenotype and adult reproductive function. Control of gonadal development and steroidogenesis is unde...

journal_title：General and comparative endocrinology

authors： Mayer LP,Overstreet SL,Dyer CA,Propper CR

更新日期：2002-06-01 00:00:00

abstract：:The zebrafish is a powerful genetic model organism. In recent years, zebrafish has been increasingly used to model human diseases. Due to a number of recent technological advancements, the genetic tool box is now also stocked with sophisticated transgenic and reverse genetic tools. Here, we focus on both commonly used...

journal_title：General and comparative endocrinology

authors： Sugano Y,Neuhauss SC

更新日期：2013-07-01 00:00:00

abstract：:Despite its occurrence in most vertebrate species, the function of the hypophysial pars tuberalis (PT) remains obscure. Recent immunocytochemical studies have demonstrated the presence of hormone-containing cells in the few species studied. In the present study the secretory cell composition of the PT was characterize...

journal_title：General and comparative endocrinology

authors： Gross DS

更新日期：1984-11-01 00:00:00

abstract：:How nestling birds respond to stressful situations may constitute an important survival component that has lasting developmental effects on the hypothalamic pituitary adrenal (HPA) axis. As birds are exposed to increasing amounts of potential anthropogenic stressors through land use change, understanding how these fac...

journal_title：General and comparative endocrinology

authors： Strasser EH,Heath JA

更新日期：2011-08-01 00:00:00

abstract：:Comparative hormone studies can reveal how physiology underlies life history variation. Here, we examined seasonal variation in plasma testosterone concentration between populations of male orange-crowned warblers (Vermivora celata) breeding in Fairbanks, Alaska (V. c. celata) and on Santa Catalina Island, California ...

journal_title：General and comparative endocrinology

authors： Horton BM,Yoon J,Ghalambor CK,Moore IT,Scott Sillett T

更新日期：2010-09-15 00:00:00

abstract：:Sexual selection acts on traits that increase reproductive success. Variation in reproductive success is often higher among males than females. Consequently, sexual selection has been studied extensively in males while its possible role in females has only recently attracted considerable attention. In some cooperative...

journal_title：General and comparative endocrinology

authors： Lutermann H,Young AJ,Bennett NC

更新日期：2013-06-15 00:00:00

abstract：:In fish, melatonin is reported to be produced mainly in the pineal organ, but there is also evidence for the presence of melatonin in a number of extrapineal sites where it could act as an intracellular mediator or paracrine signal. The present study use the reverse transcription-polymerase chain reaction (RT-PCR) to ...

journal_title：General and comparative endocrinology

authors： Fernández-Durán B,Ruibal C,Polakof S,Ceinos RM,Soengas JL,Míguez JM

更新日期：2007-06-01 00:00:00

abstract：:Previous investigations have shown that the release of PRL and GH from the tilapia pituitary is directly sensitive to osmotic pressure and a variety of endocrine and neuroendocrine factors. The present studies were aimed at determining whether the spontaneous release of PRL and GH, in vitro, is: (1) sensitive to the n...

journal_title：General and comparative endocrinology

authors： Rodgers BD,Helms LM,Grau EG

更新日期：1992-06-01 00:00:00

abstract：:Deer antlers offer a unique model to study organ regeneration in mammals. Antler regeneration relies on the pedicle periosteum (PP) cells and is triggered by a decrease in circulating testosterone (T). The molecular mechanism for antler regeneration is however, unclear. Label-free liquid chromatography-mass spectromet...

journal_title：General and comparative endocrinology

authors： Akhtar RW,Liu Z,Wang D,Ba H,Shah SAH,Li C

更新日期：2019-11-01 00:00:00

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：:Insulin-like growth factor-1 (IGF-1) is a member of the vertebrate insulin/insulin-like growth factor/relaxin gene family necessary for growth, reproduction, and survival at both the cellular and organismal level. Its sequence, protein structure, and function have been characterized in mammals, birds, and fish; howeve...

journal_title：General and comparative endocrinology

authors： Sparkman AM,Schwartz TS,Madden JA,Boyken SE,Ford NB,Serb JM,Bronikowski AM

更新日期：2012-08-01 00:00:00

abstract：:Neurohypophysial hormones in mammals are synthesized by the ovary and may influence reproductive function. Although arginine vasotocin (AVT) can induce premature oviposition in chickens, the gonadal content of AVT or mesotocin (MT) has not been examined in this species. Ovarian follicles were removed 2 hr before ovipo...

journal_title：General and comparative endocrinology

authors： Saito N,Kinzler S,Koike TI

更新日期：1990-07-01 00:00:00

abstract：:Melatonin and arylalkylamine N-acetyltransferase (AANAT), the rate-limiting enzyme in melatonin synthesis, have taken on special importance in vertebrate circadian biology. Recent identification of genes encoding two AANAT (AANAT(1) and AANAT(2)) and two subtypes of melatonin receptor (Mel-R; Mel(1a) and Mel(1b)) in s...

journal_title：General and comparative endocrinology

authors： Shi Q,Ando H,Coon SL,Sato S,Ban M,Urano A

更新日期：2004-05-01 00:00:00

abstract：:The functional abilities of 9.5-, 10.5-, 11.5-, and 12.5-day-old chick embryos to respond to exogenous thyrotrophin-releasing hormone (TRH) were evaluated by means of changes in plasma total thyroxine (T4). T4 concentrations were determined 3.0, 6.0, 12.0, and 24.0 hr after TRH treatment. The data of the present inves...

journal_title：General and comparative endocrinology

authors： Thommes RC,Williams DJ,Woods JE

更新日期：1984-08-01 00:00:00

abstract：:Seasonal patterns of fecal 17beta-OH-androgen, estrogen, and progesterone equivalents of male and female greylag geese (Anser anser) were analyzed in a flock of free-living geese. These were compared among social categories determined by pairbond status and breeding success. The annual cycle was divided into 13 phases...

journal_title：General and comparative endocrinology

authors： Hirschenhauser K,Möstl E,Kotrschal K

更新日期：1999-04-01 00:00:00