Atrial natriuretic peptide gene expression within invertebrate hearts.

abstract：:In the summer of 1991 (late May to early September), I measured seasonal levels of plasma androgens in two species of plethodontid salamanders to assess the temporal relationship of elevated plasma androgen levels with spermatogenic events and with sexual behavior. In both species, spermatogenesis occurs in the spring...

journal_title：General and comparative endocrinology

authors： Woodley SK

更新日期：1994-11-01 00:00:00

abstract：:The dynamics of androgen production by perfused Xenopus testis explants has been investigated under various gonadotropic stimulations. Androgens were measured in perfusate by radioimmunoassay. The behavior of hormones in the perfusion system was assessed. Pieces of testis were capable of producing androgens after more...

journal_title：General and comparative endocrinology

authors： Boujard D,Joly J

更新日期：1983-09-01 00:00:00

abstract：:The total cortisol content in tilapia was 55 pg immediately following fertilization, then decreased abruptly and maintained a lower level of 10-20 pg until hatching; after hatching the cortisol content increased to 50 pg by the 7th day. Fertilized eggs were incubated in either 32% saltwater or fresh water and sampled ...

journal_title：General and comparative endocrinology

authors： Hwang PP,Wu SM

更新日期：1993-11-01 00:00:00

abstract：:An investigation into vitamin D-like molecules has been performed on whole extracts of the terrestrial amphipod Orchestia cavimana, using a sensitive nonequilibrium assay employing 1,25-(OH)2 D receptor from calf thymus. Relatively large amounts of these secosteroid-like molecules were observed and they varied in conc...

journal_title：General and comparative endocrinology

authors： Meyran JC,Chapuy MC,Arnaud S,Sellem E,Graf F

更新日期：1991-10-01 00:00:00

abstract：:The presence of specific, saturable, high-affinity gonadotropin receptors was demonstrated in membrane preparations from preovulatory ovarian follicles of amago salmon (Oncorhynchus rhodurus), including intact follicles, isolated thecal layers, and isolated granulosa cells. Optimum conditions for the binding study usi...

journal_title：General and comparative endocrinology

authors： Kanamori A,Nagahama Y

更新日期：1988-10-01 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：:The hybrids of carp (Cyprinus carpio) and goldfish (Carassius auratus) collected from the lower Great Lakes between 1978 and 1981 exhibited epizootics of gonadal neoplasm which were rare in the parental species. The pituitary glands of hybrids were, on average, 2.5 times larger than that of carp of similar body size. ...

journal_title：General and comparative endocrinology

authors： Down NE,Peter RE,Leatherland JF

更新日期：1988-02-01 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：:Circannual and circadian variations in plasma levels of steroids were estimated by radioimmunoassay in the female and male catfish, Heteropneustes fossilis, over two consecutive annual reproductive cycles. In the female catfish, testosterone (T), estradiol-17 beta (E2), and estrone (E1) were detectable in the plasma o...

journal_title：General and comparative endocrinology

authors： Lamba VJ,Goswami SV,Sundararaj BI

更新日期：1983-05-01 00:00:00

abstract：:Fasting animals must ration stored reserves appropriately for metabolic demands. Animals that experience fasting concomitant with other metabolically demanding activities are presented with conflicting demands of energy conservation and expenditure. Our objective was to understand how fasting northern elephant seals r...

journal_title：General and comparative endocrinology

authors： Fowler MA,Debier C,Champagne CD,Crocker DE,Costa DP

更新日期：2016-01-01 00:00:00

abstract：:Leptin plays key roles in body weight regulation, energy metabolism, food intake, reproduction and immunity in mammals. However, its function in teleosts is still unclear. In the present study, two leptin genes (gLepA and gLepB) and one leptin receptor gene (gLepR) were cloned and characterized in orange-spotted group...

journal_title：General and comparative endocrinology

authors： Zhang H,Chen H,Zhang Y,Li S,Lu D,Zhang H,Meng Z,Liu X,Lin H

更新日期：2013-01-15 00:00:00

abstract：:In the gilthead sea bream (Sparus auratus) 17β-estradiol (E₂) plays an important role in the synthesis of vitellogenin. During vitellogenesis, vitellogenin as a nutritional precursor protein is loaded with calcium, which requires elevated plasma calcium levels. This is accomplished via E₂-dependent processes. Reports ...

journal_title：General and comparative endocrinology

authors： Bevelander GS,Guerreiro PM,Spanings T,Flik G

更新日期：2011-08-01 00:00:00

abstract：:Plasma concentrations and stored levels of the neuroendocrine peptides arginine vasotocin (AVT) and urotensin II (UII) were measured in the euryhaline flounder (Platichthys flesus) following the acute hypo-osmotic challenge of direct seawater (SW) to fresh water (FW) transfer. Hormone measures, plasma osmolality, and ...

journal_title：General and comparative endocrinology

authors： Bond H,Winter MJ,Warne JM,McCrohan CR,Balment RJ

更新日期：2002-01-01 00:00:00

abstract：:The pattern and kinetics of degradation of native salmon gonadotropin-releasing hormone (sGnRH) and mammalian leuteinizing hormone-releasing hormone (LHRH) by pituitary bound enzymes were studied in the gilthead seabream, Sparus aurata. sGnRH and LHRH were incubated for different periods of time with membrane or cytos...

journal_title：General and comparative endocrinology

authors： Goren A,Zohar Y,Fridkin M,Elhanati E,Koch Y

更新日期：1990-08-01 00:00:00

abstract：:The box turtle (Terrapene carolina triunguis) does not appear to have evolved a mechanism for secondary bone formation similar to Aves inasmuch as several parameters of bone calcium metabolism were unaffected by estrogen treatment. This suggests that reproduction does not constitute a substantial stress to the calcium...

journal_title：General and comparative endocrinology

authors： Magliola L

更新日期：1984-04-01 00:00:00

abstract：:G protein-coupled receptors (GPCRs) play an important role in physiology and disease and represent productive drug targets. Orphan GPCRs, which have unknown endogenous ligands, are considered drug targets and consequently have attracted great interest in identifying their endogenous cognate ligands for deorphanization...

journal_title：General and comparative endocrinology

authors： Zhang L,Song J,Zang Z,Tang H,Li W,Lai S,Deng C

更新日期：2020-12-01 00:00:00

abstract：:The circulating serum concentrations of various steroid hormones in mature sockeye salmon were measured at four different developmental stages in their upstream migration to spawn at Adams River in British Columbia, Canada. In females, a high level of estradiol-17 beta was found in fish at the first location, and it p...

journal_title：General and comparative endocrinology

authors： Truscott B,Idler DR,So YP,Walsh JM

更新日期：1986-04-01 00:00:00

abstract：:In hamsters, the Harderian glands (HGs) exhibit a marked sexual dimorphism which is thought to depend on dihydrotestosterone (DHT); however, it is unclear whether hamster HGs contain one or more 5 alpha-reductases and whether these enzymes are differentially expressed in males and females. In this study, we isolated s...

journal_title：General and comparative endocrinology

authors： Ramos L,Chávez B,Vilchis F

更新日期：2010-04-01 00:00:00

abstract：:Immunocytochemical distribution and dynamics of vasotocin (VT) were studied in the air-breathing catfish Heteropneustes fossilis in relation to the reproductive cycle. Vasotocin was localized in the brain and ovary by streptavidin-biotin immunocytochemistry. The immunoreactivity was found throughout the hypothalamo-hy...

journal_title：General and comparative endocrinology

authors： Singh V,Joy KP

更新日期：2008-11-01 00:00:00

abstract：:In many fishes, dopamine (DA) strongly inhibits luteinizing hormone (LH) release by direct action at the pituitary level. In this study, the effect of DA on LH synthesis was examined by detecting its β-subunit mRNA level in immature grass carp pituitary cells. Results showed that DA inhibited LHβ mRNA expression and i...

journal_title：General and comparative endocrinology

authors： Wang X,Zhao T,Wei H,Zhou H

更新日期：2011-08-01 00:00:00

abstract：:Only recently have the cardiac actions of parathyroid hormone and its N-terminal (1-34) fragment (bPTH(1-34] been examined. Parathyroid hormone was found to exert a positive chronotropic effect on the heart tissue of several mammals and one amphibian in vivo and/or in vitro. The purpose of the present study was to exa...

journal_title：General and comparative endocrinology

authors： Furspan PB,Sham JS,Shew RL,Peng G,Pang PK

更新日期：1984-11-01 00:00:00

abstract：:Strong individual and life-history variation in serum glucocorticoids has been documented in many wildlife species. Less is known about variation in hypothalamic-pituitary-adrenal (HPA) axis responsiveness and its impact on metabolism. We challenged 18 free-ranging adult male northern elephant seals (NES) with an intr...

journal_title：General and comparative endocrinology

authors： Ensminger DC,Somo DA,Houser DS,Crocker DE

更新日期：2014-08-01 00:00:00

abstract：:The vasoconstrictive and cardiovascular actions of a recently identified bradykinin (BK)-related peptide (Gly-Ile-Thr-Ser-Trp-Leu-Pro-Phe) from the little skate, Leucoraja erinacea were examined in the unanesthetised little skate. Intra-arterial administration of a skate BK (0.1-1 nmolkg(-1)) produced a hypertensive r...

journal_title：General and comparative endocrinology

authors： Dasiewicz PJ,Conlon JM,Anderson WG

更新日期：2011-11-01 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：:A radioimmunoassay (RIA) was developed to measure cortisone in Atlantic salmon plasma. Diatomaceous earth microcolumn chromatography was used to separate the cortisone from other steroids. The RIA method following chromatography was validated by analyzing each of six samples of blood by double isotope derivative assay...

journal_title：General and comparative endocrinology

authors： Weisbart M,McGowan LK

更新日期：1984-09-01 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：:The objectives of this study were to investigate the seasonal changes in pituitary gonadotropins, growth hormone (GH), and estrogen receptor (ER) isoform mRNA in wild female and male largemouth bass (LMB) (Micropterus salmoides) from an unpolluted habitat to better understand reproductive physiology in this ecological...

journal_title：General and comparative endocrinology

authors： Martyniuk CJ,Kroll KJ,Porak WF,Steward C,Grier HJ,Denslow ND

更新日期：2009-09-15 00:00:00

abstract：:A reliable and rapid technique for the measurement of estradiol-17 beta, testosterone, progesterone, 17 alpha-hydroxyprogesterone, 17 alpha,20 beta-dihydroxy-4-pregnen-3-one, and cortisol by reverse-phase high-performance liquid chromatography and radioimmunoassay in single female goldfish serum samples of 50 microlit...

journal_title：General and comparative endocrinology

authors： Venkatesh B,Tan CH,Lam TJ

更新日期：1989-12-01 00:00:00

abstract：:We have examined the distribution and physiological effects of three evolutionarily and sequence-related neuropeptides in Rhodnius prolixus. These neuropeptides, adipokinetic hormone (RhoprAKH), corazonin (CRZ) and adipokinetic hormone/corazonin-related peptide (RhoprACP) are present in distinct, non-overlapping neuro...

journal_title：General and comparative endocrinology

authors： Patel H,Orchard I,Veenstra JA,Lange AB

更新日期：2014-01-01 00:00:00

abstract：:Baleen whales are vulnerable to environmental impacts due to low fecundity, capital breeding strategies, and their reliance on a large amount of prey resources over large spatial scales. There has been growing interest in monitoring health and physiological stress in these species but, to date, few measures have been ...

journal_title：General and comparative endocrinology

authors： Mingramm FMJ,Keeley T,Whitworth DJ,Dunlop RA

更新日期：2020-05-15 00:00:00