Specificity of ovulation hormones of some basommatophoran species studied by means of iso- and heterospecific injections.

abstract：:In goldfish, plasma gonadotropin levels increase during spawning in both males and females (GTH surge). A female-typical GTH surge induces ovulation (ovulatory surge), and a male-typical surge triggers milt production in response to sex pheromones released from ovulatory females. This study examined whether the male-t...

journal_title：General and comparative endocrinology

authors： Kobayashi M,Furukawa K,Kim MH,Aida K

更新日期：1997-12-01 00:00:00

abstract：:Most seasonally reproducing vertebrates show pronounced changes in testosterone levels throughout the year. The Challenge Hypothesis [Wingfield, J.C., Hegner, R.E., Dufty, A.M., Ball, G. F., 1990. The "challenge hypothesis": theoretical implications for patterns of testosterone secretion, mating systems, and breeding ...

journal_title：General and comparative endocrinology

authors： Goymann W

更新日期：2009-09-01 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：:Cytochrome P450 17A1 (P450c17) is the key enzyme required for the production of androgenic sex steroids by converting progestogens to androgens. 5α-reductases are enzymes that convert testosterone (T) to dihydrotestosterone (DHT), which has a greater affinity for androgen receptors (AR) and stronger action than T. Our...

journal_title：General and comparative endocrinology

authors： Han W,Xie W,Zhang Y,Zhang F,Zhang H,Han Y,Yuan Z,Weng Q

更新日期：2017-12-01 00:00:00

abstract：:In the present study we sought to investigate interactions between hypothalamic nitric oxide (NO) and ghrelin signaling on food intake and energy substrate utilization as measured by the respiratory exchange ratio (RER). Guide cannulae were unilaterally implanted in either the arcuate (ArcN) or paraventricular (PVN) n...

journal_title：General and comparative endocrinology

authors： Abtahi S,Mirza A,Howell E,Currie PJ

更新日期：2017-09-01 00:00:00

abstract：:The public deposition of large transcriptome shotgun assembly (TSA) datasets for the Araneae (true spiders) provides a resource for determining the structures of the native neuropeptides present in members of this chelicerate order. Here, the Araneae TSA data were mined for putative peptide-encoding transcripts using ...

journal_title：General and comparative endocrinology

authors： Christie AE,Chi M

更新日期：2015-03-01 00:00:00

abstract：:Due to global and local climate changes, farmed salmon may experience periods of elevated sea temperatures. An experiment was conducted to examine endocrine and dietary effects of high sea temperatures in adult (2.0 kg) and sexually immature Atlantic salmon, Salmo salar L. Groups of salmon were exposed to 19 °C while ...

journal_title：General and comparative endocrinology

authors： Hevrøy EM,Waagbø R,Torstensen BE,Takle H,Stubhaug I,Jørgensen SM,Torgersen T,Tvenning L,Susort S,Breck O,Hansen T

更新日期：2012-01-01 00:00:00

abstract：:Skin pigmentation pattern is a species-specific characteristic that depends on the number and the spatial combination of several types of chromatophores. This feature can change during life, for example in the metamorphosis or reproductive cycle, or as a response to biotic and/or abiotic environmental cues (nutrition,...

journal_title：General and comparative endocrinology

authors： Vissio PG,Darias MJ,Di Yorio MP,Pérez Sirkin DI,Delgadin TH

更新日期：2021-01-15 00:00:00

abstract：:Previous studies have provided evidence that D-Asp plays a role in steroid-mediated reproductive biology in amphibians, reptiles, birds and mammals. To examine the molecular involvement of D-Asp on steroidogenic pathway regulation, we analysed the expression of StAR, P450 aromatase and 5αRed2 mRNAs in Pelophylax escul...

journal_title：General and comparative endocrinology

authors： Burrone L,Raucci F,Di Fiore MM

更新日期：2012-01-01 00:00:00

abstract：:In vivo studies were carried out in adult chickens in an attempt to evaluate the effectiveness of somatostatin (SRIF) in regulating hormone secretion from the splenic pancreatic lobe after 99% of the pancreatic mass was surgically ablated. Sixteen days after either sham operation or 99% pancreatectomy, birds were infu...

journal_title：General and comparative endocrinology

authors： Cieslak SR,Hazelwood RL

更新日期：1986-08-01 00:00:00

abstract：:The discovery of novel members of the CRF neuropeptide family, urocortin 1 (Ucn1), urocortin 2 and 3 has provided important insights into stress adaptation pathways, and predicted that stress adaptation involves more systems than the HPA-axis alone. This mini-review aims to summarize our recent data and research by ot...

journal_title：General and comparative endocrinology

authors： Kozicz T

更新日期：2007-08-01 00:00:00

abstract：:The copepod Calanus finmarchicus is the most abundant zooplankton species in the North Atlantic. While the life history of this crustacean is well studied, little is known about its peptidergic signaling systems despite the fact that these pathways are undoubtedly important components of its physiological/behavioral c...

journal_title：General and comparative endocrinology

authors： Christie AE,Roncalli V,Wu LS,Ganote CL,Doak T,Lenz PH

更新日期：2013-06-15 00:00:00

abstract：:Intraperitoneal injection of CaCl2 in intact, sham-stanniectomized, and stanniectomized American eels, Anguilla rostrata (LeSueur), resulted in a rapid elevation of plasma calcium level which was more marked and of longer duration in the stanniectomized eels. The same treatment reduced whole body calcium influx (JinCa...

journal_title：General and comparative endocrinology

authors： Fenwick JC,Brasseur JG

更新日期：1991-06-01 00:00:00

abstract：:The photoperiodic control of puberty in birds was studied using hybrid red-legged partridges (Alectoris graeca chukar). In the wild partridges first breed at about 10 months of age. Males and females were held from hatch on short (8L:16D) daylengths and then at 3, 4 1/2, 6, 7 1/2, 9, and 12 weeks of age groups were tr...

journal_title：General and comparative endocrinology

authors： Creighton JA

更新日期：1988-07-01 00:00:00

abstract：:Corticosterone, at baseline and moderately elevated levels, is thought to regulate energy mobilization during the predictable life-history cycle. In birds, corticosterone is known to be moderately elevated during migration, and some experiments on captive, but migratory active birds have shown that exogenous corticost...

journal_title：General and comparative endocrinology

authors： Eikenaar C,Fritzsch A,Bairlein F

更新日期：2013-06-01 00:00:00

abstract：:The vertebrate oxytocin and vasopressin receptors form a family of G-protein-coupled receptors (GPCRs) that mediate a large variety of functions, including social behavior and the regulation of blood pressure, water balance and reproduction. In mammals four family members have been identified, three of which respond t...

journal_title：General and comparative endocrinology

authors： Ocampo Daza D,Lewicka M,Larhammar D

更新日期：2012-01-01 00:00:00

abstract：:GPCRs are the largest family of receptors accounting for about 30% of the current drug targets. However, it is difficult to fully elucidate the mechanisms regulating intracellular GPCR signal regulation. It is thus important to consider and investigate GPCRs with respect to endogenous situations. Our group has been in...

journal_title：General and comparative endocrinology

authors： Kobayashi Y

更新日期：2020-07-01 00:00:00

abstract：:1,25-dihydroxyvitamin D3 (1,25(OH)2D3), the hormonally active metabolite of vitamin D3 interacts with its nuclear/cytosolic receptor to induce biological responses in target tissues. Naked mole rats appear to be naturally deficient in vitamin D. The questions arise whether these animals possess the 1,25(OH)2D3 recepto...

journal_title：General and comparative endocrinology

authors： Sergeev IN,Buffenstein R,Pettifor JM

更新日期：1993-06-01 00:00:00

abstract：:The widespread use of P-nitrophenol (PNP) as a raw material in pesticides, medicines and dyes has led to environmental pollution. PNP is a well-known endocrine disruptor in mammals and quails. This study investigated the effects of long-term PNP exposure on the testicular development and semen quality of roosters. Pub...

journal_title：General and comparative endocrinology

authors： Ren S,Li Y,Li C

更新日期：2021-01-15 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：:In gravid female goldfish held at 10-12 degrees, a single injection of des Gly10,[D-Ala6]luteinizing hormone-releasing hormone ethylamide (LHRH-A), or 2 injections of LHRH-A given 12 hr apart, increased serum gonadotropin (GtH) concentrations, but did not stimulate germinal vesicle migration or ovulation. Injection of...

journal_title：General and comparative endocrinology

authors： Chang JP,Peter RE

更新日期：1983-10-01 00:00:00

abstract：:Pancreatic polypeptide (PP) has been isolated from pancreatic extracts of the herring gull (Larus argentatus) using a radioimmunoassay employing an antiserum (PP 221), generated to the conserved C-terminal hexapeptide amide of mammalian PP. Gel permeation and reverse-phase HPLC fractionation of crude pancreatic extrac...

journal_title：General and comparative endocrinology

authors： Barton CL,Shaw C,Halton DW,Thim L

更新日期：1994-02-01 00:00:00

abstract：:Baseline and stress-responsive glucocorticoid (GC) levels were characterized during the active period in free-ranging male and reproductive female little brown myotis (Myotis lucifugus). Bats were trapped and blood was sampled within 3 min of capture at two maternity sites during the summer and at one swarming site pr...

journal_title：General and comparative endocrinology

authors： Reeder DM,Kosteczko NS,Kunz TH,Widmaier EP

更新日期：2004-04-01 00:00:00

abstract：:The development and dynamics of TSH and GTH cells were studied immunohisto- and immunocytochemically in the salamander Hynobius retardatus, which had been reported to show neoteny in a specific environment and a precocious development and maturation of testis in goitrogen-treated larvae. Pituitary glands from normally...

journal_title：General and comparative endocrinology

authors： Yamaguchi M,Tanaka S,Wakahara M

更新日期：1996-12-01 00:00:00

abstract：:The presence of cholecystokinin (CCK), originally isolated from porcine small intestine, has been reported in a diversity of invertebrates ranging, from cnidarians to protochordates, but so far, not in echinoderms. We have used immunohistochemical techniques to demonstrate the presence of cells expressing CCK-like imm...

journal_title：General and comparative endocrinology

authors： García-Arrarás JE,Torres-Avillán I,Ortíz-Miranda S

更新日期：1991-08-01 00:00:00

abstract：:Proper functioning of the endocrine stress axis requires communication between the stress axis and other regulatory mechanisms. We here describe an intimate interplay between the stress axis and recombinant human leptin (rhLeptin) in a teleostean fish, the common carp Cyprinus carpio. Restraint stress (by netting up t...

journal_title：General and comparative endocrinology

authors： Gorissen M,Bernier NJ,Manuel R,de Gelder S,Metz JR,Huising MO,Flik G

更新日期：2012-08-01 00:00:00

abstract：:This study examines the regulation of thyroid activity in adult rough-skinned newts, Taricha granulosa. Aquatic, breeding-condition newts were hypophysectomized and were injected for 23 days with the mammalian adenohypophysial hormones: ACTH, PRL, and GH. During a fourth week of treatment, these newts also received TS...

journal_title：General and comparative endocrinology

authors： Specker JL,Brown PS,Brown SC

更新日期：1985-08-01 00:00:00

abstract：:The melanotrope cell in the amphibian pituitary pars intermedia is a model to study fundamental aspects of neuroendocrine integration. They release alpha-melanophore-stimulating hormone (alphaMSH), under the control of a large number of neurochemical signals derived from various brain centers. In Xenopus laevis, most ...

journal_title：General and comparative endocrinology

authors： van Wijk DC,Meijer KH,Roubos EW

更新日期：2010-09-01 00:00:00

abstract：:Effects of epidermal growth factor (EGF) and possible mechanisms of EGF-mediated signal transduction were investigated in isolated cells of the digestive gland of the mussel (Mytilus galloprovincialis Lam. ). EGF induced a cytosolic Ca2+ transient and subsequently stimulated DNA synthesis; both effects were dose-depen...

journal_title：General and comparative endocrinology

authors： Canesi L,Ciacci C,Orunesu M,Gallo G

更新日期：1997-08-01 00:00:00

abstract：:The effects of a long term partial food restriction were studied in chickens and rats. In chickens the treatment resulted in increased plasma T4 levels while T4 levels in rats remained unchanged. Plasma T3 decreased in both species. In vitro hepatic outer ring deiodinating type I (ORD-I) activity was not influenced by...

journal_title：General and comparative endocrinology

authors： Darras VM,Cokelaere M,Dewil E,Arnouts S,Decuypere E,Kühn ER

更新日期：1995-12-01 00:00:00