In vitro study of the effect of adenosine on frog adrenocortical cells.

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：:This article is focused on the effect of specific phase relation of serotonergic and dopaminergic oscillations on the gonadal responses of different avian species. These species include (i) summer breeding birds - Red headed bunting (exhibiting post-reproductive absolute photorefractoriness) and Indian Weaver bird (wh...

journal_title：General and comparative endocrinology

authors： Chaturvedi CM,Yadav S

更新日期：2013-09-01 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：:Species differences in the effect of male gonadal androgens on male growth are considered a possible mechanism allowing shifts in magnitude and even direction of sexual size dimorphism (SSD) in squamate reptiles. According to the bipotential growth regulation hypothesis, the androgen testosterone (T) enhances male gro...

journal_title：General and comparative endocrinology

authors： Kubička L,Golinski A,John-Alder H,Kratochvíl L

更新日期：2013-07-01 00:00:00

abstract：:The maternal control directing the very first hours of life is of pivotal importance for ensuring proper development to the growing embryo. Thanks to the finely regulated inheritance of maternal factors including mRNAs and proteins produced during oogenesis and stored into the mature oocyte, the embryo is sustained th...

journal_title：General and comparative endocrinology

authors： Miccoli A,Dalla Valle L,Carnevali O

更新日期：2017-05-01 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：:Attractiveness in adult females of Calliphora vomitoria is correlated with ovarian development and there is a marked increase during the previtellogenic and vitellogenic periods. The development of attractiveness may result from the combined actions of ecdysteroids and juvenile hormone. A rise in total hydrocarbons pa...

journal_title：General and comparative endocrinology

authors： Trabalon M,Campan M,Porcheron P,Clement JL,Baehr JC,Moriniere M,Joulie C

更新日期：1990-11-01 00:00:00

abstract：:The effects of estradiol (E2) on growth hormone (GH) production was investigated in gonad-intact female goldfish. It was first necessary to generate a specific antibody for use in immunocytochemistry, Western, and dot-blot analyses of GH production. To accomplish this, grass carp GH (gcGH) cDNA was cloned by the rever...

journal_title：General and comparative endocrinology

authors： Zou JJ,Trudeau VL,Cui Z,Brechin J,Mackenzie K,Zhu Z,Houlihan DF,Peter RE

更新日期：1997-04-01 00:00:00

abstract：:To examine the production of steroids with potential oocyte maturation-inducing or pheromonal activity in the goldfish (Carassius auratus) we have incubated mature ovaries of this species with 17-[3H]hydroxyprogesterone. The metabolites in the unconjugated, glucuronide, and sulfate fractions were identified by chromat...

journal_title：General and comparative endocrinology

authors： Kime DE,Scott AP,Canario AV

更新日期：1992-09-01 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：:The hormone leptin has been identified in all vertebrate classes, but its physiological roles in non-mammalian vertebrates are not well defined. To elucidate leptin regulation in energy homeostasis in a teleost fish species, this study compares hypothalamic and pituitary leptin signaling systems in energetically diver...

journal_title：General and comparative endocrinology

authors： Gong N,Johansson M,Björnsson BT

更新日期：2016-09-01 00:00:00

abstract：:Unlike mammals, the goldfish is unique in having dopamine (DA) D1 receptors in the anterior pituitary. In this species, DA stimulates growth hormone (GH) release via D1 receptors coupled to the cAMP-dependent pathway. To further examine the postreceptor mechanisms of this novel pituitary DA D1 system, the role of extr...

journal_title：General and comparative endocrinology

authors： Wong AO,Van Goor F,Chang JP

更新日期：1994-06-01 00:00:00

abstract：:In this study, parathyroid hormone (PTH) receptor binding was examined in the membrane fraction of the endometrium of the shell gland of laying and nonlaying hens by the use of (125)I-PTH-related peptide (PTHrP) binding assays. Specific (125)I-PTHrP binding was found in the endometrium of the shell gland and increased...

journal_title：General and comparative endocrinology

authors： Ieda T,Takahashi T,Saito N,Yasuoka T,Kawashima M,Shimada K

更新日期：2000-02-01 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：:Thyroid hormones (THs) are crucial for normal vertebrate development and are the one obligate morphogen that drives amphibian metamorphosis. However, contrary to other metamorphosing vertebrates, lampreys exhibit a sharp drop in serum TH early in metamorphosis, and anti-thyroid agents such as potassium perchlorate (KC...

journal_title：General and comparative endocrinology

authors： Stilborn SS,Manzon LA,Schauenberg JD,Manzon RG

更新日期：2013-03-01 00:00:00

abstract：:A radioimmunoassay (RIA) capable of determining blood ACTH levels in salmonid fishes was developed and validated. The RIA used an antibody raised against mammalian ACTH, iodinated human ACTH as tracer, and human 1-39 ACTH as standard. Incubation of the standard or unknown with antibody for 3 days before addition of as...

journal_title：General and comparative endocrinology

authors： Sumpter JP,Donaldson EM

更新日期：1986-06-01 00:00:00

abstract：:In fishes, maternal exposure to a stressor can influence offspring size and behavior. However, less is known about how maternal stress influences physiological processes in offspring, such as function of the hypothalamic-pituitary-interrenal (HPI) axis. We examined the impact of chronic maternal exposure to an acute c...

journal_title：General and comparative endocrinology

authors： Sopinka NM,Jeffrey JD,Burnett NJ,Patterson DA,Gilmour KM,Hinch SG

更新日期：2017-02-01 00:00:00

abstract：:The possible physiological role of a putative testicular gonadotropin-releasing hormone (GnRH)-like material was studied in the frog, Rana esculenta. We have investigated (a) changes of mitotic index (MI) of primary spermatogonia (SPG) in GnRH agonist (GnRH-Ag)-treated testes in vitro; (b) changes of androgen concentr...

journal_title：General and comparative endocrinology

authors： Di Matteo L,Minucci S,Fasano S,D'Antonio M,Pierantoni R,Chieffi G

更新日期：1990-07-01 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：:Ecdysis, or the shedding of the old cuticle, depends on coordinated stereotyped behaviors, regulated by a number of neuropeptides. In the hornworm, Manduca sexta, two neuropeptides interact, namely ecdysis-triggering hormone (ETH) and eclosion hormone. We looked at the effects of ETH in vivo and in vitro, on the brain...

journal_title：General and comparative endocrinology

authors： Asuncion-Uchi M,El Shawa H,Martin T,Fuse M

更新日期：2010-03-01 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：: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：:The effects of calcium on steroidogenesis and cyclic AMP production in chicken granulosa cells were examined. For the expression of full steroidogenic effects by LH, forskolin, and 8-bromo cyclic AMP the presence of calcium in the incubation medium was essential, the optimal concentration being 1 mM. Moreover, calcium...

journal_title：General and comparative endocrinology

authors： Asem EK,Hertelendy F

更新日期：1986-04-01 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：:Fish can respond to stimuli from the internal or external environment with activation of the hypothalamo-pituitary-interrenal (HPI) axis and the secretion of cortisol. Stimuli that activate the HPI axis of fish include short term air exposure and increases in water temperature. The present study was conducted to deter...

journal_title：General and comparative endocrinology

authors： Cockrem JF,Bahry MA,Chowdhury VS

更新日期：2019-01-01 00:00:00

abstract：:Homogenates of ovaria as well as testes from the locust Locusta migratoria were analyzed for the presence of pregnenolone, testosterone, and estradiol by gas chromatography followed by mass spectrometry. Selected ion monitoring analyses revealed that the molecular ion and two characteristic fragment ions of pregnenolo...

journal_title：General and comparative endocrinology

authors： Novak FJ,Lambert JG

更新日期：1989-10-01 00:00:00

abstract：:Fish egg yolk is largely derived from vitellogenins, which are synthesized in the liver, taken up from the maternal circulation by growing oocytes via receptor-mediated endocytosis and enzymatically processed into yolk proteins that are stored in the ooplasm. Lipid droplets are another major component of fish egg yolk...

journal_title：General and comparative endocrinology

authors： Hiramatsu N,Todo T,Sullivan CV,Schilling J,Reading BJ,Matsubara T,Ryu YW,Mizuta H,Luo W,Nishimiya O,Wu M,Mushirobira Y,Yilmaz O,Hara A

更新日期：2015-09-15 00:00:00

abstract：:Plasma prolactin (PRL) and vitellogenin (VTG) concentrations were determined during the annual reproductive cycle of the newt Triturus carnifex Laur. Plasma PRL was measured by a radioimmunoassay using purified newt (Cynops pyrrogaster) PRL as standard and radioligand and its antibodies. Using ELISA, plasma VTG titers...

journal_title：General and comparative endocrinology

authors： Mosconi G,Yamamoto K,Kikuyama S,Carnevali O,Mancuso A,Vellano C

更新日期：1994-09-01 00:00:00

abstract：:Fetal development is a critical period of physical development, and factors in the intrauterine environment can cause lasting effects on the growth and development of offspring. There is little research evaluating organizational effects of early androgen exposure of endogenous maternal origins on the prenatal and post...

journal_title：General and comparative endocrinology

authors： Smith AS,Birnie AK,French JA

更新日期：2010-04-01 00:00:00

abstract：:Atrazine (ATZ) is a widely used herbicide and is considered an endocrine disruptor of different organisms. However, the molecular interactions of ATZ with biological targets in mammalian endocrine systems are not understood fully. In the present study, we observed that ATZ administration (50, 100 and 200 mg/kg) for 3 ...

journal_title：General and comparative endocrinology

authors： Jin Y,Wang L,Fu Z

更新日期：2013-04-01 00:00:00