abstract：:Two types of cDNAs (GTH-I beta and -II beta) that encode the beta subunit of goldfish gonadotropin were cloned from a goldfish pituitary cDNA library. The nucleotide sequence of GTH-I beta cDNA was 616 bp long, encoding 130 amino acids, and that of GTH-II beta was 552 bp long, encoding 140 amino acids. These two types...

journal_title：General and comparative endocrinology

authors： Yoshiura Y,Kobayashi M,Kato Y,Aida K

更新日期：1997-03-01 00:00:00

abstract：:Vasoactive intestinal polypeptide (VIP) is a neuropeptide that has numerous physiological actions and is widely distributed in the body. However, as yet, there is no sequence information about VIP receptors in lower vertebrates. Partial cDNA fragments spanning transmembrane domains 2 to 6 of VIP receptors were isolate...

journal_title：General and comparative endocrinology

authors： Chow BK,Yuen TT,Chan KW

更新日期：1997-02-01 00:00:00

abstract：:Songbirds possess a specialized network of brain nuclei mediating song learning and production, the song system. In many species, the nuclei in this circuit are larger in volume in males housed on long photoperiods than in males housed on short photoperiods. Exposure to long days initially leads to increases in circul...

journal_title：General and comparative endocrinology

authors： Bernard DJ,Ball GF

更新日期：1997-02-01 00:00:00

abstract：:While there is considerable structural evidence that insulin-like growth factors (IGFs) share a long evolutionary history, little is known about the conservation of IGF function. In order to address this, we have made recombinant hagfish IGF, hence allowing characterization of an IGF from a representative of the primi...

journal_title：General and comparative endocrinology

authors： Upton Z,Francis GL,Chan SJ,Steiner DF,Wallace JC,Ballard FJ

更新日期：1997-01-01 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：:Vitamin D binding protein (DBP) was isolated from the plasma of the snapping turtle, Chelydra serpentina (mixed sex adult), and compared with the previously characterized dual function binding plasma protein that binds both thyroxine (T4) and vitamin D (tsTDBP) in an emydid turtle, Trachemys scripta. Purification of C...

journal_title：General and comparative endocrinology

authors： Horowitz M,Licht P

更新日期：1996-12-01 00:00:00

abstract：:The plasma levels of arginine vasotocin (AVT) and isotocin (IT) in rainbow trout (Oncorhynchus mykiss) were studied to assess possible diurnal variations in neurohypophysial nonapeptides. Fish were kept under natural photoperiod and adapted to fresh and brackish Baltic water. Blood was sampled at 5:00, 11:00, 16:00, 2...

journal_title：General and comparative endocrinology

authors： Kulczykowska E,Stolarski J

更新日期：1996-11-01 00:00:00

abstract：:Reproductive maturation and regulation is centrally orchestrated by gonadotropin-releasing hormone (GnRH). GnRH produced in the vertebrate hypothalamus acts on the pituitary to regulate gonadotropins. In nonplacental mammalian species, it has recently been shown that a second GnRH gene is expressed in mesencephalic ce...

journal_title：General and comparative endocrinology

authors： Kasten TL,White SA,Norton TT,Bond CT,Adelman JP,Fernald RD

更新日期：1996-10-01 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：:Interrenal activity in relation to sexual maturity in male rainbow trout, and the effects of in vivo treatment with 11-ketotestosterone (11-KT) were investigated. Silastic pellets containing either 11-KT or no steroid were implanted in maturing male and immature male and female rainbow trout for a total of 11 weeks. T...

journal_title：General and comparative endocrinology

authors： Young G,Thorarensen H,Davie PS

更新日期：1996-09-01 00:00:00

abstract：:High levels of the amino acid neurotransmitter glutamate were found in the goldfish hypothalamus and pituitary using high performance liquid chromatography with fluorometric detection. A specific polyclonal antibody to glutamate was generated in the rabbit for immunocytochemistry. Localization studies demonstrated tha...

journal_title：General and comparative endocrinology

authors： Trudeau VL,Sloley BD,Kah O,Mons N,Dulka JG,Peter RE

更新日期：1996-08-01 00:00:00

abstract：:Melatonin is a skin lightening agonist of the toad Bufo ictericus. The hormone also exhibits an autodesensitizing action as well as an inhibitory activity on the darkening response to alpha-MSH. In an attempt to pharmacologically characterize the melatonin receptor of the toad pigment cells, serotonin and N-acetylsero...

journal_title：General and comparative endocrinology

authors： Filadelfi AM,Castrucci AM

更新日期：1996-08-01 00:00:00

abstract：:Because of the high degree of primary sequence conservation in neuropeptides and low molecular weight polypeptide hormones, these polypeptides are not useful for constructing phylogenetic trees based on maximum parsimony analysis. This review focuses on the organization of neuropeptide and polypeptide hormone precurso...

journal_title：General and comparative endocrinology

authors： Dores RM,Rubin DA,Quinn TW

更新日期：1996-07-01 00:00:00

abstract：:To design a homologous bioassay for the molt-inhibiting hormone and the crustacean hyperglycemic hormone of the shrimp Penaeus vannamei, the effect of sinus gland homogenate (SGh), in vitro, on ecdysteroid production by Y-organs (YOs), and the effect of the injection of SGh, in vivo, on the glycemia of shrimps have be...

journal_title：General and comparative endocrinology

authors： Sefiani M,Le Caer JP,Soyez D

更新日期：1996-07-01 00:00:00

abstract：:Tadpoles of Rana catesbeiana at TK stages X-XII, about 9 months old, were laparotomized, and the males were implanted intraperitoneally with silastic tubes containing estradiol (E2) for various periods. Male tadpoles implanted with empty tubes served as the controls. Histology, secretions of E2, and testosterone (T) i...

journal_title：General and comparative endocrinology

authors： Chang LT,Yu NW,Hsu CY,Liu HW

更新日期：1996-06-01 00:00:00

abstract：:Profiles of testosterone, 11-ketotestosterone, androstenedione, and estradiol were determined by RIA, and immunocytochemical techniques were employed to identify gonadotropin (GTH) I and II and gonadotropin releasing hormone (GnRH) in monosex and mixed sex populations of rainbow trout from 1 to 126 days postfertilizat...

journal_title：General and comparative endocrinology

authors： Feist G,Schreck CB

更新日期：1996-06-01 00:00:00

abstract：:Chemical identification of neurohypophysial hormones from about 80 vertebrate species reveals that two evolutionary lineages can be traced in bony vertebrates, a vasopressin-like hormone line and an oxytocin-like hormone line, which were derived from the duplication of an ancestral gene that may have been present in a...

journal_title：General and comparative endocrinology

authors： Acher R

更新日期：1996-05-01 00:00:00

abstract：:We developed and validated a noninvasive method to quantify fecal estrogens and progestins as a tool for monitoring long-term ovarian activity in free-ranging African elephants. The lag times between iv injection of [(3)H]estradiol and [(14)C]progesterone and peak excretion of radioactivity in urine and feces were app...

journal_title：General and comparative endocrinology

authors： Wasser SK,Papageorge S,Foley C,Brown JL

更新日期：1996-05-01 00:00:00

abstract：:By mapping the distribution of cholecystokinin (CCK) receptor types onto an established phylogenetic hypothesis of vertebrate relationships, we tested two hypothesis about the evolution of CCK receptors: (1) A single CCK receptor type, CCK-X, is the ancestral receptor, while CCK-A and CCK-B receptors represent derived...

journal_title：General and comparative endocrinology

authors： Oliver AS,Vigna SR

更新日期：1996-04-01 00:00:00

abstract：:In this study, we compare the ontogenic patterns for thyroid hormones, growth hormone (GH), and insulin-like growth factor-I (IGF-I) in altricial European starlings and precocial Japanese quail and examine the effects of feed restriction on these species. The most marked difference in development between the altricial...

journal_title：General and comparative endocrinology

authors： Schew WA,McNabb FM,Scanes CG

更新日期：1996-03-01 00:00:00

abstract：:The expression of the preproglucagon gene in vertebrates is markedly species- and tissue-dependent. Three peptides derived from the posttranslational processing of preproglucagon were isolated from an extract of the pancreas of the urodele Amphiuma tridactylum (threetoed amphiuma). The primary structures of the peptid...

journal_title：General and comparative endocrinology

authors： Cavanaugh ES,Nielsen PF,Conlon JM

更新日期：1996-01-01 00:00:00

abstract：:The role of ovarian hormones in the expression of parental behavior and in the regulation of LH secretion was investigated in incubating commercial meat-type hens. After ovariectomy, incubating hens continued to incubate eggs normally and brooded day-old chicks given to replace eggs, in a manner similar to sham-ovarie...

journal_title：General and comparative endocrinology

authors： Lea RW,Richard-Yris MA,Sharp PJ

更新日期：1996-01-01 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

abstract：:Melatonin binding sites were examined in the quail eye using 2-[125]iodomelatonin. Radioreceptor assays indicated similar binding sites in membrane preparations of neural retina (NR) and choroid-retinal pigment epithelium (C-RPE) eye components. In both tissues binding of the radioligand was specific, saturable, and o...

journal_title：General and comparative endocrinology

authors： James K,Skene DJ,Lucini V,Stankov B,Arendt J

更新日期：1995-11-01 00:00:00

abstract：:Insulin receptor downregulation in the isolated hepatocytes of lamprey (Lampetra fluviatilis) was studied at the ambient temperature for this species. Preincubation of hepatocytes with 10(-9)-10(-8) M unlabeled insulin decreased insulin binding capacity to 43, 37, and 34% at 4, 15, and 25 degrees, respectively. Preinc...

journal_title：General and comparative endocrinology

authors： Leibush BN,Lappova YL

更新日期：1995-10-01 00:00:00

abstract：:The present investigation was designed to (1) determine if atrial natriuretic factor gene expression occurs within invertebrates as well as within vertebrates; (2) determine whether the product of this gene expression is the 126-amino-acid atrial natriuretic factor prohormone or some other molecular species; and (3) e...

journal_title：General and comparative endocrinology

authors： Poulos JE,Gower WR Jr,Friedl FE,Vesely DL

更新日期：1995-10-01 00:00:00

abstract：:This set of experiments investigated the role of protein kinase-C (PKC) as a second messenger in vasoactive intestinal peptide (VIP)-stimulated prolactin (PRL) secretion and PRL mRNA abundance. Dispersed anterior pituitary cells (5 x 10(5) or 10(6) cells/tube) were isolated from laying turkeys and incubated in 1.0 ml ...

journal_title：General and comparative endocrinology

authors： Sun S,el Halawani ME

更新日期：1995-09-01 00:00:00

abstract：:Interrenal tissue from embryonic and larval rainbow trout (Oncorhynchus mykiss) was cultured in vitro and exposed to various doses of adrenocorticotropin (ACTH) to document the ontogeny of interrenal responsiveness to tropic stimulation. Resting and acute stress-induced changes in whole-body cortisol levels in vivo we...

journal_title：General and comparative endocrinology

authors： Barry TP,Ochiai M,Malison JA

更新日期：1995-09-01 00:00:00

abstract：:cDNA encoding the beta type of thyroid hormone receptor (THR) was cloned from a lambda gt10 library prepared from the whole bodies of metamorphosing flounder (Paralichthys olivaceus). The deduced amino acid sequence of the flounder THR beta (fTHR beta 1) showed higher homologies to the known THR beta s of other verteb...

journal_title：General and comparative endocrinology

authors： Yamano K,Inui Y

更新日期：1995-08-01 00:00:00

abstract：:To quantify the renal excretion of arginine vasotocin (AVT) in birds, synthetic AVT was infused into conscious Pekin ducks at rates of 0.03, 0.10, and 0.30 ng/kg/min for 30 min and the relationships between plasma and urine AVT concentrations were monitored by radioimmunoassay. As plasma AVT concentrations increased (...

journal_title：General and comparative endocrinology

authors： Gray DA

更新日期：1995-07-01 00:00:00

abstract：:Rhythmicity of thyroid follicle structure, cell division, and T4 secretion in vitro was studied in anuran tadpoles on a 12L:12D cycle with light onset at 0800 hr. Stage XIII Rana pipiens larvae had a significant circadian rhythm of follicle lumen diameter (acrophase 1052 hr). Follicle cell height was higher at 0900 hr...

journal_title：General and comparative endocrinology

authors： Wright ML,Blanchard LS,Pikula A,Labieniec KE

更新日期：1995-07-01 00:00:00

abstract：:A significant reduction in stress-induced plasma cortisol levels is apparent in mature male rainbow trout compared to immature fish of both sexes and of the same age and strain. Mean plasma cortisol levels in groups of immature fish subjected to a standard 1-hr confinement stress were consistently higher (range 93.9 +...

journal_title：General and comparative endocrinology

authors： Pottinger TG,Balm PH,Pickering AD

更新日期：1995-06-01 00:00:00

abstract：:Changes in the pituitary cells involved in amphibian metamorphosis were studied in Bufo arenarum tadpoles with inhibited thyroid function. After hatching, larvae were treated for 5 months with potassium perchlorate (KClO4), a goitrogenic substance known to prevent absorption of iodine from water or food, resulting in ...

journal_title：General and comparative endocrinology

authors： Miranda LA,Paz DA,Dezi RE,Pisanó A

更新日期：1995-05-01 00:00:00

abstract：:Juvenile hormone (JH) regulation of the synthesis of LHPI, the major secretory protein of the long hyaline tubule in the male accessory reproductive gland (MARG) of Melanoplus sanguinipes, was examined by in vitro radiolabeling and immunoprecipitation. In MARG taken from normal insects JH III immediately stimulates pr...

journal_title：General and comparative endocrinology

authors： Ismail SM,Ismail PM,Gillott C

更新日期：1995-04-01 00:00:00

abstract：:Dopamine (DA) was infused into the third ventricle of anesthetized laying turkey hens at various concentrations to determine its effect on both basal prolactin (PRL) levels and ongoing electrically induced PRL secretion. The infusion of DA at rates of 1.0 or 10.0 nmol/min resulted in dose dependent increases in plasma...

journal_title：General and comparative endocrinology

authors： Youngren OM,Pitts GR,Phillips RE,el Halawani ME

更新日期：1995-04-01 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：:Cardiovascular responses to synthetic eel [Asn1, Val5, Gly9]-ANG-I, ANG-III (2-8), and ANG-I (1-7) were measured in conscious and resting freshwater North American eels. Indwelling Doppler flow probes were placed on the ventral and dorsal aortas, a pressure catheter in the lienomesenteric artery, and a peptide deliver...

journal_title：General and comparative endocrinology

authors： Butler DG,Oudit GY

更新日期：1995-02-01 00:00:00

abstract：:In in vivo experiments injection of dopamine (DA) or leucine enkephalin (L-Enk) produced hypoglycemia in intact red swamp crayfish, Procambarus clarkii. In contrast, neither compound had a significant effect on the circulating glucose concentration in eyestalkless individuals. With intact crayfish spiperone, a DA rece...

journal_title：General and comparative endocrinology

authors： Sarojini R,Nagabhushanam R,Fingerman M

更新日期：1995-01-01 00:00:00

abstract：:The aim of the present study was to determine the relationship between seasonal variation in levels of insulin, cortisol, and corticosterone and body mass in a natural population of golden-mantled ground squirrels (Spermophilus saturatus) over the active season, from April to August. The body mass of females is at an ...

journal_title：General and comparative endocrinology

authors： Boswell T,Woods SC,Kenagy GJ

更新日期：1994-12-01 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