abstract：:In order to delineate further the molecular evolution of the renin-angiotensin system in vertebrates, angiotensin I (ANG I) has been isolated after incubation of plasma and kidney extracts of emu (Dromiceus novaehollandiae), axolotl (Ambystoma mexicanum), and sea lamprey (Petromyzon marinus). The identified sequences ...

journal_title：General and comparative endocrinology

authors： Takei Y,Joss JM,Kloas W,Rankin JC

更新日期：2004-02-01 00:00:00

abstract：:Atlantic salmon (Salmo salar) broodstock were transferred from natural (12-16 degrees C) to controlled temperatures of 14, 18 or 22 degrees C for 3 months during vitellogenesis. Fertility and survival were significantly reduced in eggs from broodstock held at 22 degrees C relative to 14 or 18 degrees C. Endocrine mech...

journal_title：General and comparative endocrinology

authors： Watts M,Pankhurst NW,King HR

更新日期：2004-02-01 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：:The effects of dopamine administration on the adrenal gland of a lizard, Podarcis sicula, are described. Dopamine (0.7mg/100g body wt/day for 4 consecutive days) raised plasma ACTH and corticosterone levels (ACTH: from the basal level of 4.40+/-0.05-7.30+/-0.08pg/ml 24h after the fourth dopamine injection; corticoster...

journal_title：General and comparative endocrinology

authors： Capaldo A,Laforgia V,Sciarrillo R,De Falco M,Valiante S,Gay F,Virgilio F,Varano L

更新日期：2004-01-01 00:00:00

abstract：:Our previous study demonstrated that recombinant goldfish activin B stimulated goldfish FSHbeta but inhibited LHbeta expression. Similar to activin B, activin A also exhibited the inverse effects on the expression of the two gonadotropins. The novel dual effects of activins on FSH and LH in the goldfish raise an inter...

journal_title：General and comparative endocrinology

authors： Yuen CW,Ge W

更新日期：2004-01-01 00:00:00

abstract：:Thyroid-dependent stomach development occurs between approximately 35 and 50 days post-hatch (dph) in laboratory-reared summer flounder larvae. The process can be blocked by thiourea (TU), and TU effects are reversed by exogenous thyroxine (T4). To establish whether a window of sensitivity exists for T4-dependent gast...

journal_title：General and comparative endocrinology

authors： Soffientino B,Specker JL

更新日期：2003-12-01 00:00:00

abstract：:Several lines of evidence suggest reproduction in the ranid frogs is potently regulated by the gonadal steroids, in particular 5alpha-dihydrotestosterone (DHT) and 17beta-estradiol (E(2)), and a non-gonadal steroid, the stress hormone corticosterone (Cort). Little is known about how these steroid hormones act upon the...

journal_title：General and comparative endocrinology

authors： Tsai PS,Lunden JB,Jones JT

更新日期：2003-12-01 00:00:00

abstract：:The sex steroids testosterone (T) and estradiol-17beta (E2) play important roles in vertebrate reproduction and development. However, little is known about the relationship between plasma steroid levels (which can influence reproductive function) and yolk steroid levels (which can influence embryonic development) in o...

journal_title：General and comparative endocrinology

authors： Lovern MB,Wade J

更新日期：2003-11-01 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：:Bicuspid teeth are a morphological characteristic in adult metamorphosed urodeles. However, during the mating season the males of many species of plethodontid salamanders (Urodela, Plethodontidae) from northern America bear large monocuspid teeth on their jaws. Since androgen levels are elevated during the mating seas...

journal_title：General and comparative endocrinology

authors： Ehmcke J,Wistuba J,Clemen G,Schlatt S

更新日期：2003-10-15 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：:The reproductive biology of the Indian major carp Cirrhinus mrigala is tightly synchronized with the seasonal changes in the environment. While the ovaries show growth from February through June, the fish spawn in July-August to coincide with the monsoon; thereafter the fish pass into the postspawning and resting phas...

journal_title：General and comparative endocrinology

authors： Biju KC,Singru PS,Schreibman MP,Subhedar N

更新日期：2003-10-01 00:00:00

abstract：:Changes in plasma levels of steroid hormones in pre-spawning chum salmon (Oncorhynchus keta) were examined for 6 years in association with sexual maturation. Fish were sampled along their homing pathway from the coastal sea to the spawning ground from 1995 to 2000. Plasma levels of testosterone (T), 11-ketotestosteron...

journal_title：General and comparative endocrinology

authors： Onuma T,Higashi Y,Ando H,Ban M,Ueda H,Urano A

更新日期：2003-09-01 00:00:00

abstract：:The developmental expression of gonadotropin-releasing hormone receptor (GnRH-R) and its splice variants was examined in the gonads of tammar wallaby pouch young in order to elucidate the functional role of GnRH-R in the developing testis and ovary. Wallaby GnRH-R, like eutherian GnRH-Rs, contains three exons and two ...

journal_title：General and comparative endocrinology

authors： Cheung TC,Hearn JP

更新日期：2003-08-01 00:00:00

abstract：:In higher animals, it is now generally accepted that neurosteroids are steroids that are synthesized in the brain itself, but it remains unclear where, in terms of the phylogeny of chordates, such neurosteroids are first synthesized? We have tried to detect progesterone immunohistochemically in the central nervous sys...

journal_title：General and comparative endocrinology

authors： Takeda N,Kubokawa K,Matsumoto G

更新日期：2003-07-01 00:00:00

abstract：:Reptilia is the only vertebrate class in which cDNA for the gonadotropin beta subunit precursor molecule has not been cloned. We have isolated the full-length cDNA clone encoding the LH beta subunit precursor molecule and a partial cDNA clone encoding the FSH beta subunit precursor molecule from a pituitary cDNA libra...

journal_title：General and comparative endocrinology

authors： Aizawa Y,Ishii S

更新日期：2003-07-01 00:00:00

abstract：:Human pro-IGF-I Eb-peptide (hEb) and rainbow trout pro-IGF-I Ea-4-peptide (rtEa-4) have recently been shown to share unique biological activities [Gen. Comp. Endocrinol. 126 (2002) 342; Cell. Exp. Cell. Res. 280 (2002) 75]. To further understand the action mechanism of these proteins, we studied the binding properties...

journal_title：General and comparative endocrinology

authors： Kuo YH,Chen TT

更新日期：2003-06-15 00:00:00

abstract：:Interference in radioimmunoassays (RIAs) was frequently encountered during endocrinological studies of the emu (Dromaius novaehollandiae). Interference was greatest when serum was cloudy or opaque. Such samples appeared seasonally, in spring and summer during the phase of fat deposition, and in the winter when females...

journal_title：General and comparative endocrinology

authors： Van Cleeff JK,Blackberry MA,Blache D,Martin GB

更新日期：2003-06-15 00:00:00

abstract：:Fecal glucocorticoid metabolite analysis is a useful tool for monitoring adrenocortical activity in captive and free-ranging wildlife. Glucocorticoid metabolites may not be evenly distributed within fecal samples and this variability could affect the interpretation of glucocorticoid metabolite measurements. Furthermor...

journal_title：General and comparative endocrinology

authors： Millspaugh JJ,Washburn BE

更新日期：2003-06-01 00:00:00

abstract：:Cortisol is an important seawater (SW) osmoregulatory hormone in the Mozambique tilapia (Oreochromis mossambicus), a highly euryhaline cichlid able to live in environments ranging from fresh water (FW) to salinities well in excess of full-strength seawater. Previous studies indicate that cortisol may promote SW adapta...

journal_title：General and comparative endocrinology

authors： Dean DB,Whitlow ZW,Borski RJ

更新日期：2003-06-01 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：:We gave an accurate immunolocalization of CHH (crustacean hyperglycemic hormone) and VIH (vitellogenesis-inhibiting hormone) in the brain and the sinus gland of the woodlouse Armadillidium vulgare. The two immune sera have been respectively raised against HPLC-purified CHH and against a small peptide derived from the ...

journal_title：General and comparative endocrinology

authors： Azzouna A,Philippe M,Jarry T,Grève P,Martin G

更新日期：2003-04-01 00:00:00

abstract：:The four-spine sculpin Cottus kazika is a euryhaline teleost, in which faster growth in seawater (SW) and freshwater (FW) has been reported. In this study, cDNA clones encoding growth hormone (GH) and insulin-like growth factor I (IGF-I) were isolated from this species to examine the involvement of the GH/IGF-I axis i...

journal_title：General and comparative endocrinology

authors： Inoue K,Iwatani H,Takei Y

更新日期：2003-03-01 00:00:00

abstract：:Abnormalities in calcium (Ca(2+)) homeostasis are reported in horses with several pathological conditions; however, there is little information on Ca(2+) regulation in horses. The objectives of the present study were to determine the Ca(2+) set-point in healthy horses, to determine whether the Ca(2+)/parathyroid hormo...

journal_title：General and comparative endocrinology

authors： Toribio RE,Kohn CW,Sams RA,Capen CC,Rosol TJ

更新日期：2003-02-15 00:00:00

abstract：:We investigated post-natal development of the adrenocortical stress-response system in captive American kestrels (Falco sparverius) by measurements of baseline and stress-induced levels of corticosterone at ages 10, 16, 22, and 28 days post-hatching. Baseline levels of corticosterone increased significantly during pos...

journal_title：General and comparative endocrinology

authors： Love OP,Bird DM,Shutt LJ

更新日期：2003-02-01 00:00:00

abstract：:The serotonin system has been implicated in the modulation of endocrine and behavioral components of reproduction. In this study, we examined endogenous hypothalamic indolamines during sexual differentiation and long-term effects of exogenous steroids during this time. In Experiment 1, Japanese quail were studied duri...

journal_title：General and comparative endocrinology

authors： Abdelnabi MA,Ottinger MA

更新日期：2003-01-01 00:00:00

abstract：:A novel angiotensin I (ANG I) has been isolated from incubates of plasma and kidney extracts of the flounder, Platichthys flesus, using ion-exchange, gel-permeation, and reverse-phase high performance liquid chromatography (HPLC). Its sequence was determined as H-Asn-Arg-Val-Tyr-Ile-His-Pro-Phe-Thr-Leu-OH by sequence ...

journal_title：General and comparative endocrinology

authors： Balment RJ,Warne JM,Takei Y

更新日期：2003-01-01 00:00:00

abstract：:An enzyme-linked immunosorbent assay (ELISA) has been developed for a conjugated bile acid, 7alpha,12alpha,24-trihydroxy-5alpha-cholan-3-one 24-sulfate (commonly referred to as 3-keto petromyzonol sulfate [3kPZS]), a pheromone released by reproductively mature male sea lampreys to attract sexually mature females. A po...

journal_title：General and comparative endocrinology

authors： Yun SS,Scott AP,Siefkes MJ,Li W

更新日期：2002-12-01 00:00:00

abstract：:Laboratory populations of the prairie deermouse (Peromyscus maniculatus) reach a growth asymptote due primarily to the failure of more than 90% of the young born into the population to mature sexually. This inhibition is reversible; when young are removed from the inhibiting influence of the population more than 75% w...

journal_title：General and comparative endocrinology

authors： Cherry BA,Cadigan B,Mansourian N,Nelson C,Bradley EL

更新日期：2002-11-01 00:00:00

abstract：:Although 11-ketotestosterone (11-KT) has been found in blood of females of several diadromous fish species, the importance, abundance, and prevalence of this and related 11-oxygenated androgens in females have not been investigated. To address this issue and to determine whether the differences among androgen profiles...

journal_title：General and comparative endocrinology

authors： Lokman PM,Harris B,Kusakabe M,Kime DE,Schulz RW,Adachi S,Young G

更新日期：2002-10-15 00:00:00

abstract：:Recently, we reported the cloning of a cDNA fragment from Fundulus heteroclitus liver encoding the open reading frame of type 2 deiodinase (FhD2). We here report the cloning of 14 kb of genomic sequence from F. heteroclitus that includes the previously reported coding region of the F. heteroclitus Dio2 gene (FhDio2), ...

journal_title：General and comparative endocrinology

authors： Orozco A,Jeziorski MC,Linser PJ,Greenberg RM,Valverde-R C

更新日期：2002-09-01 00:00:00

abstract：:The hippopotamus (Hippopotamus amphibius) is a popular zoo animal and an integral part of wetland ecosystems in its native continent of Africa. However, information about the reproductive physiology of the hippopotamus is limited compared to the other megaherbivores of Africa such as the elephant and the rhinoceros. T...

journal_title：General and comparative endocrinology

authors： Graham LH,Reid K,Webster T,Richards M,Joseph S

更新日期：2002-08-01 00:00:00

abstract：:We analyzed the participation of sympathetic ovarian innervation in the prepubertal female guinea pig on regulation of compensatory ovarian hypertrophy (COH) and compensatory ovulation at puberty. The COH of the left ovary was significantly higher that of the right one (left ovary: 41.5+/-5.2 vs. 27.5+/-5.6%, p<0.05, ...

journal_title：General and comparative endocrinology

authors： Riboni L

更新日期：2002-07-01 00:00:00

abstract：:Several lines of evidence support a role of endogenous opioids in the brain's regulation of gonadotropin secretion in birds and mammals, although the neuroanatomic basis of such regulation is not clear. We used double-label fluorescence immunohistochemistry employing polyclonal antisera raised in sheep against chicken...

journal_title：General and comparative endocrinology

authors： Millam JR,Wang R,Craig-Veit CB,Siopes TD

更新日期：2002-06-15 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：:To examine the reproductive endocrinology of a large pleuronectiform fish, barfin flounder, Verasper moseri, a promising candidate for aquaculture and resource enhancement in northern Japan due to its high commercial value, three gonadotropin-releasing hormones (GnRHs) in the brain was identified by isolation of their...

journal_title：General and comparative endocrinology

authors： Amano M,Takahashi A,Yamanome T,Okubo K,Aida K,Yamamori K

更新日期：2002-05-01 00:00:00

abstract：:Whether administration of the corticotropin-releasing factor (CRF) antagonist alpha-helical CRF(9-41) (hCRF) prevents stress response of the ovary, the oviduct, the adrenals, and the spleen was studied in the lizard Mabuya carinata. Stressors (handling, chasing, and noise) applied randomly, five times a day, for 1 mon...

journal_title：General and comparative endocrinology

authors： Ganesh CB,Yajurvedi HN

更新日期：2002-04-01 00:00:00

abstract：:Birds respond to environmental changes by modulating their levels of plasma corticosterone, a stress hormone produced by the adrenal glands. Baseline levels of corticosterone and the magnitude of adrenocortical response to acute stress are known to vary seasonally. Photoperiod is one of several potential factors which...

journal_title：General and comparative endocrinology

authors： Pravosudov VV,Kitaysky AS,Saldanha CJ,Wingfield JC,Clayton NS

更新日期：2002-04-01 00:00:00

abstract：:Precise regulation of hormone secretion from endocrine cells is of critical importance for the maintenance of animal homeostasis. This is partly enabled through the ability of endocrine cells to adapt dynamically their secretory activity to the physiological demands through complex functional changes. Such a secretory...

journal_title：General and comparative endocrinology

authors： Peinado JR,Castaño JP,Vázquez-Martínez R,Anouar Y,Tonon MC,Vaudry H,Gracia-Navarro F,Malagón MM

更新日期：2002-03-01 00:00:00

abstract：:The concentrations of norepinephrine in hypothalamus and norepinephrine and epinephrine in head kidney were significantly decreased in treated tilapia (Oreochromis aureus) during the time course of cold exposure (12 degrees) as compared to the control (25 degrees). The elevation of norepinephrine and epinephrine in pl...

journal_title：General and comparative endocrinology

authors： Chen WH,Sun LT,Tsai CL,Song YL,Chang CF

更新日期：2002-03-01 00:00:00