abstract：:The effect of corticosteroid hormones in fish are mediated through intracellular receptors that act as ligand-binding transcription factors. Many studies have been devoted to cortisol binding using radiolabeled ligand in fish and allowed characterization of a single class of high affinity binding sites in various tiss...

journal_title：General and comparative endocrinology

authors： Prunet P,Sturm A,Milla S

更新日期：2006-05-15 00:00:00

abstract：:High-resistance epithelia derived from amphibian sources such as frog skin, toad urinary bladder, and the A6 Xenopus laevis kidney cell line have been widely used to elucidate the underlying mechanisms involved in the regulation of vectorial ion transport. More recently, the isolation of high-resistance mammalian cell...

journal_title：General and comparative endocrinology

authors： Shane MA,Nofziger C,Blazer-Yost BL

更新日期：2006-05-15 00:00:00

abstract：:Amphibians occupy a wide variety of ecological habitats, and their adaptation is made possible through the specialization of the epithelia of their osmoregulatory organs, such as the skin, kidney, and urinary bladder, which control the hydromineral and acid-base balance of their internal medium. Amphibians can change ...

journal_title：General and comparative endocrinology

authors： Uchiyama M,Konno N

更新日期：2006-05-15 00:00:00

abstract：:Insulin-like growth factor I (IGF-I) plays a key role in the complex system that regulates bony fish growth, differentiation, and reproduction. The major source of circulating IGF-I is liver, but IGF-I-producing cells also occur in other organs, including the gonads. Because no data are available on the potential prod...

journal_title：General and comparative endocrinology

authors： Berishvili G,D'Cotta H,Baroiller JF,Segner H,Reinecke M

更新日期：2006-05-01 00:00:00

abstract：:In the present study, we investigated the distribution and activities of corticotropin-releasing factor (CRF) and adrenocorticotropic hormone (ACTH) immunoreactive (ir) cells in the brain and pituitary of Liza ramada during ovarian maturation, seawater acclimation, and induction of spawning. Using immunohistochemistry...

journal_title：General and comparative endocrinology

authors： Mousa SA,Mousa MA

更新日期：2006-04-01 00:00:00

abstract：:Ghrelin, a peptide hormone produced by the stomach in mammals, stimulates growth hormone release and food intake. Recently, ghrelin was identified and characterized in chicken proventriculus and shown to stimulate growth hormone release but inhibit feed intake. The purpose of this work was to identify and further char...

journal_title：General and comparative endocrinology

authors： Richards MP,Poch SM,McMurtry JP

更新日期：2006-02-01 00:00:00

abstract：:Proopiomelanocortin (POMC) is a common precursor of adrenocorticotropic hormone (ACTH), melanophore-stimulating hormone (MSH), and endorphin (END). In pituitary gland, POMC receives posttranslational processing by which different peptides are generated in the pars distalis (PD) and pars intermedia (PI). Recently, we c...

journal_title：General and comparative endocrinology

authors： Takahashi A,Amano M,Amiya N,Yamanome T,Yamamori K,Kawauchi H

更新日期：2006-02-01 00:00:00

abstract：:The renal roles of physiologically relevant doses of angiotensin II (Ang II) and C-type natriuretic peptide (CNP) were investigated in the dogfish, Scyliorhinus canicula, using an in situ perfused trunk preparation. Perfusion with 10(-9) M Ang II resulted in a glomerular antidiuresis and decreases in perfusate flow ra...

journal_title：General and comparative endocrinology

authors： Wells A,Anderson WG,Cains JE,Cooper MW,Hazon N

更新日期：2006-01-15 00:00:00

abstract：:To understand the effect of testosterone on sex differentiation, the quantities of testosterone (T) and estradiol-17beta (E2) in developing eggs of medaka (Oryzias latipes) were measured by radioimmunoassay, and the influence on sex differentiation of treating embryos with exogenous androgens was also examined. Endoge...

journal_title：General and comparative endocrinology

authors： Iwamatsu T,Kobayashi H,Sagegami R,Shuo T

更新日期：2006-01-01 00:00:00

abstract：:The aim of this work was to study, in the Cebus apella monkey, the developmental changes in the microanatomy of the utero-ovarian ligament (UOL) and whether their vascular and neural elements might be involved in the transfer of signals between the ovaries and uterus. Sections including uterus, UOL, and ovary obtained...

journal_title：General and comparative endocrinology

authors： Nagle CA,Mendizábal AF,Lahoz MM,Porta MM,Torres MI

更新日期：2005-12-01 00:00:00

abstract：:Growth hormone (GH) is a key factor controlling postnatal growth and development. Despite growth-promoting effects in mammals, GH is not associated with muscle growth in the chicken. Janus kinase 2 (JAK2) has been identified as the first intracellular step in GH receptor (GHR) signaling in many species, however, there...

journal_title：General and comparative endocrinology

authors： Zhou Y,Wang X,Hadley J,Corey SJ,Vasilatos-Younken R

更新日期：2005-11-01 00:00:00

abstract：:Under 25 degrees C and a long day photoperiod, about half of the fourth instar Psacothea hilaris larvae molt to the fifth instar on day 13 and pupate about 18 days later; the rest pupate without a further larval molt with a mean fourth instar period of 24 days. However, starvation of fourth instar larvae exceeding a t...

journal_title：General and comparative endocrinology

authors： Munyiri FN,Ishikawa Y

更新日期：2005-11-01 00:00:00

abstract：:Day length predicts changing of seasons at mid-latitudes, but additional environmental cues (e.g., temperature, rainfall) give more precise information about timing of food peaks critical for offspring survival. We tested the effects of temperature on seasonal reproductive development of male song sparrows (Melospiza ...

journal_title：General and comparative endocrinology

authors： Perfito N,Meddle SL,Tramontin AD,Sharp PJ,Wingfield JC

更新日期：2005-09-01 00:00:00

abstract：:Adrenomedullin (AM) is a multifunctional evolutionarily highly conserved peptide. Although its genomic and amino acid (aa) sequences are known in several mammalian species and in fish, the structure of the AM gene remains unknown in intermediate phyla, including birds. Here, we report the structure and aa sequence of ...

journal_title：General and comparative endocrinology

authors： Zudaire E,Cuesta N,Martínez A,Cuttitta F

更新日期：2005-08-01 00:00:00

abstract：:The present paper describes neuropeptide Y-like-immunoreactive (NPY-ir) structures in the brain of the spotted gar, Lepisosteus oculatus, with special regard to their anatomical relations to gonadotropin-releasing hormone (GnRH)-ir structures in the hypothalamus and the terminal nerve (TN). NPY-ir cells were found in ...

journal_title：General and comparative endocrinology

authors： Chiba A

更新日期：2005-07-01 00:00:00

abstract：:Three gonadotropin-releasing hormones (GnRHs) and three cognate receptors have been identified in vertebrates, with distinct distributions and functions. According to their sequences, the receptors can be grouped into distinct classes: types I, II, and III. One branch contains all type-I GnRH receptors (GnRH-R-I) from...

journal_title：General and comparative endocrinology

authors： Levavi-Sivan B,Avitan A

更新日期：2005-05-15 00:00:00

abstract：:Growth hormone (GH) and insulin-like growth factor-I (IGF-I) play major roles in the endocrine regulation of fish growth, but their interdependency and mode of action has not been well elucidated. The GH-IGF-I system is essential for normal vertebral growth in mouse, but this has not been studied in fish. To study the...

journal_title：General and comparative endocrinology

authors： Wargelius A,Fjelldal PG,Benedet S,Hansen T,Björnsson BT,Nordgarden U

更新日期：2005-05-15 00:00:00

abstract：:Extrapituitary expression of the growth hormone (GH) gene has been reported for the immune system of various vertebrates. In the rainbow trout (Oncorhynchus mykiss), GH mRNA could be detected in several lymphoid organs and leucocytes by reverse transcriptase-polymerase chain reaction (RT-PCR). To understand the contro...

journal_title：General and comparative endocrinology

authors： Yada T,Muto K,Azuma T,Hyodo S,Schreck CB

更新日期：2005-05-15 00:00:00

abstract：:The messenger RNA expression for the inhibin/activin subunits in the granulosa layer of avian follicles of different developmental stages has previously been reported. In the present study, we examined the pattern of secretion of these protein subunits from cultured granulosa cells (GC) of avian follicles of defined m...

journal_title：General and comparative endocrinology

authors： Johnson PA,Brooks CF,Davis AJ

更新日期：2005-05-01 00:00:00

abstract：:The thyroid hormone plays an essential role in the metamorphosis in flatfish, during which external asymmetry (for example, eye relocation and pigmentation) is established. However, no information is available on the expression mechanisms of metamorphic asymmetry. Since the presence of malformed juveniles (having eith...

journal_title：General and comparative endocrinology

authors： Tagawa M,Aritaki M

更新日期：2005-04-01 00:00:00

abstract：:Follicle-stimulating hormone (FSH), a glycoprotein consisting of an alpha subunit and a unique beta subunit, is essential for gonadal development and function in vertebrates including teleosts. FSH is regulated by a variety of neuroendocrine and endocrine factors, and its biosynthesis is primarily determined by the ex...

journal_title：General and comparative endocrinology

authors： Lau MT,Ge W

更新日期：2005-03-01 00:00:00

abstract：:In fish, luteinizing hormone (LH) stimulates processes leading to final oocyte maturation and ovulation in females, and spermiation in males. The hormone is a heterodimeric glycoprotein composed of two non-covalently associated subunits. In this study, we describe the expression of tilapia LH (tLH) as a biologically a...

journal_title：General and comparative endocrinology

authors： Kasuto H,Levavi-Sivan B

更新日期：2005-02-01 00:00:00

abstract：:To clarify the physiological roles of the renin-angiotensin-aldosterone system (RAAS) and arginine vasotocin (AVT) on body fluid regulation in amphibians, we measured plasma concentrations of aldosterone (ALDO), angiotensin II (ANG II), and AVT after various osmotic challenges in the marine toad, Bufo marinus (Bufonid...

journal_title：General and comparative endocrinology

authors： Konno N,Hyodo S,Takei Y,Matsuda K,Uchiyama M

更新日期：2005-01-15 00:00:00

abstract：:Growth hormone-releasing hormone (GHRH) plays a pivotal role in the regulation of growth. The study of goldfish GHRH and its receptor is of particular interest as it is so far the only animal model in which two forms of GHRH-like (catfish-like and salmon-like) peptides coexist, and these peptides share only 30-40% of ...

journal_title：General and comparative endocrinology

authors： Kee F,Ng SS,Vaudry H,Pang RT,Lau EH,Chan SM,Chow BK

更新日期：2005-01-01 00:00:00

abstract：:Somatostatin receptors (sst) mediate the numerous physiological actions (e.g., aspects of growth, development, and metabolism) of the somatostatin family of peptides. In this study, we used rainbow trout (Oncorhynchus mykiss) to establish the pattern of sst subtype 1A, 1B, and 2 mRNA expression in selected tissues (op...

journal_title：General and comparative endocrinology

authors： Slagter BJ,Kittilson JD,Sheridan MA

更新日期：2004-12-01 00:00:00

abstract：:Although asymmetric development of the ovary and the oviduct is a unique characteristic in birds, the mechanism of asymmetric development still remains unclear. Recently, degradation of extracellular matrix has been suggested as an important factor related to the regression of the Müllerian duct in mammals. The presen...

journal_title：General and comparative endocrinology

authors： Ha Y,Tsukada A,Saito N,Shimada K

更新日期：2004-11-01 00:00:00

abstract：:Behavioral, biochemical, and electrophysiological studies suggest that the trihydroxylated progestin steroid, 4-pregnen-17,20beta,21-triol-3-one (20beta-S) stimulates oocyte maturation and pheromone release in the Eurasian ruffe, a freshwater percid fish. Behavioral observations found that female ruffe undergoing oocy...

journal_title：General and comparative endocrinology

authors： Sorensen PW,Murphy CA,Loomis K,Maniak P,Thomas P

更新日期：2004-10-01 00:00:00

abstract：:To characterize the involvement of the aromatase gene during the process of sex determination in the European eel (Anguilla anguilla), the expression of its gonadal form was determined during various developmental stages. The cloned cDNA from the European eel gonad (EeCYP19) contains an open reading frame of 1539 bp, ...

journal_title：General and comparative endocrinology

authors： Tzchori I,Degani G,Hurvitz A,Moav B

更新日期：2004-09-15 00:00:00

abstract：:The androgen concentration in birds' eggs varies with laying order, breeding conditions, and mate attractiveness. In passerine birds, mate attractiveness depends upon song quality. The aim of our study was to evaluate the effect of one criterion used by females to assess male song quality that is to say the presence o...

journal_title：General and comparative endocrinology

authors： Tanvez A,Béguin N,Chastel O,Lacroix A,Leboucher G

更新日期：2004-09-01 00:00:00

abstract：:This study reports the results of examination of the gonadal morphology and ultrastructural features of the androgenic hormone (AH)-producing androgenic gland cells of laboratory stocks of functional male woodlice, Armadillidium vulgare, with female genital apertures ( male symbol fga), with and without experimentally...

journal_title：General and comparative endocrinology

authors： Azzouna A,Greve P,Martin G

更新日期：2004-08-01 00:00:00

abstract：:Isolated brain-retrocerebral neurohemal complex of the silkworm of Bombyx mori was stimulated electrically and the released bombyxin (an insulin-like neuropeptide) was measured using time-resolved fluoroimmunoassay. The amount of bombyxin release depended on the number of stimulus pulses delivered to the axonal tract ...

journal_title：General and comparative endocrinology

authors： Suenobu A,Mizoguchi A,Ichikawa T

更新日期：2004-07-01 00:00:00

abstract：:Receptors for vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) in turkey cerebral cortex were characterized using two approaches: (1) in vitro radioreceptor binding of [125I]-VIP, and (2) effects of peptides from the PACAP/VIP/secretin family on cyclic AMP formation. T...

journal_title：General and comparative endocrinology

authors： Zawilska JB,Niewiadomski P,Nowak JZ

更新日期：2004-06-01 00:00:00

abstract：:We evaluated the effect of corticotropin-releasing hormone (CRH) on spatial distribution and downstream movement in an artificial stream in juvenile Chinook salmon (Oncorhynchus tshawytscha) during the period when the fish were able to tolerate seawater. An intracerebroventricular (ICV) injection of CRH (500 ng) to ha...

journal_title：General and comparative endocrinology

authors： Clements S,Schreck CB

更新日期：2004-05-15 00:00:00

abstract：:Cardueline finches (canaries, goldfinches, and rosefinches, etc.) vary widely in the degree to which their natural reproductive schedules track seasonal changes in photoperiod. In this study, we tested for photo-induction of reproductive development and photorefractoriness in males of three cardueline finch species: p...

journal_title：General and comparative endocrinology

authors： Hahn TP,Pereyra ME,Sharbaugh SM,Bentley GE

更新日期：2004-05-15 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：:Plasma concentrations of thyroid hormones (TH) were investigated during the extended posthatching developmental period (approximately 11 months) of a semi-altricial bird species, the king penguin (Aptenodytes patagonicus). The first period of growth in summer was marked by a progressive rise in plasma T4 concentration...

journal_title：General and comparative endocrinology

authors： Cherel Y,Durant JM,Lacroix A

更新日期：2004-05-01 00:00:00

abstract：:For grass carp (Ctenopharyngodon idella) raised in the Ivory Coast (with water temperatures of 26-31 degrees C), induced spawning is obligatory for fry production. However, ovulation rates following hormonal treatment are often low. We hypothesized that high temperatures are an inhibiting factor for the reproductive a...

journal_title：General and comparative endocrinology

authors： Glasser F,Mikolajczyk T,Jalabert B,Baroiller JF,Breton B

更新日期：2004-04-01 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 neuroendocrine system integrates genotype with external factors such as nutrition to regulate animal growth. To investigate the role of somatotropic axis in the interaction of genotype and nutrition, two series of experiments were conducted using broiler and layer chickens as a model. In the first experiment, both...

journal_title：General and comparative endocrinology

authors： Zhao R,Muehlbauer E,Decuypere E,Grossmann R

更新日期：2004-03-01 00:00:00

abstract：:Changes in testis size, histological status, and plasma levels of testosterone were monitored for males of three species of Western Australian desert frogs, Cyclorana maini, Cyclorana platycephala, and Neobatrachus sutor during aestivation. The frogs were induced to burrow and form cocoons soon after their capture and...

journal_title：General and comparative endocrinology

authors： Shalan AG,Bradshaw SD,Withers PC,Thompson G,Bayomy MF,Bradshaw FJ,Stewart T

更新日期：2004-03-01 00:00:00