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-acetylserotonin (intermediate products of melatonin biosynthesis) biological activities were compared to melatonin effects. Serotonin (6.4 x 10(-5) to 10(-9) M) exhibited no lightening or inhibitory activity on MSH-elicited darkening responses or melatonin-elicited lightening responses. N-acetylserotonin, although less potent than melatonin, elicited a significant lightening response on previously MSH-darkened skins. Previous exposure of the skins with N-acetylserotonin reduced both MSH-induced darkening and melatonin-induced lightening in MSH-darkened skins. These results suggest a competitive inhibition of melatonin by N-acetylserotonin and indicate that melatonin receptors in B. ictericus pigment cells may be similar to ML-1 type found in chicken retina.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Filadelfi AM,Castrucci AMdoi
10.1006/gcen.1996.0110subject
Has Abstractpub_date
1996-08-01 00:00:00pages
192-9issue
2eissn
0016-6480issn
1095-6840pii
S0016-6480(96)90110-0journal_volume
103pub_type
杂志文章abstract：:In crustaceans, vitellogenin (VTG, the precursor of major yolk protein) is synthesized in the ovary and/or hepatopancreas, and its synthesis is considered to be under the negative control of the vitellogenesis-inhibiting hormone (VIH), a neuropeptide secreted from the X-organ/sinus gland complex in the eyestalks. In t...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2006.03.005
更新日期：2006-09-01 00:00:00
abstract：:Prolonged or frequent secretion of adrenal glucocorticoids in response to aversive stimuli can negatively impact reproduction. Because female southern white rhinoceros (Ceratotherium simum simum) reproduce poorly in captivity, we compared fecal corticosterone metabolite concentrations among parous, nulliparous, and ad...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2011.02.010
更新日期：2011-05-01 00:00:00
abstract：:In bony fishes, both corticotropin-releasing factor (CRF) and urotensin-I play a role in the regulation of interrenal glucocorticoid release. The rainbow trout, Oncorhynchus mykiss, is a useful model for understanding the mechanisms of stress and the hypothalamo-pituitary-interrenal axis because of its phylogenetic po...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1999.7290
更新日期：1999-08-01 00:00:00
abstract：:Prolactin-like protein (PRL-L; LOC417800) is a homolog of PRL in non-mammalian vertebrates and can act as a functional ligand of PRL receptor (PRLR). Despite its widespread expression in extrapituitary tissues, mechanisms of regulation of PRL-L in the chicken ovary remain unknown. In this study, we first examined PRL-...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2016.10.013
更新日期：2017-01-01 00:00:00
abstract：:Over the last decades, the corticosterone stress response has been suggested as a major physiological tool to understand what strategy an individual might adopt in response to environmental perturbations. More recently, another hormone related to parental care--prolactin--has been suggested as a complementary tool to ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2012.10.008
更新日期：2013-02-01 00:00:00
abstract：:In the current study we investigated the interaction of hypothalamic paraventricular nucleus (PVN) glucagon-like peptide-1 (GLP-1) and ghrelin signaling in the control of metabolic function. We first demonstrated that acylated ghrelin injected directly into the PVN reliably altered the respiratory exchange ratio (RER)...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2018.10.008
更新日期：2019-01-01 00:00:00
abstract：:In fish there are few data on the gonadotropin-releasing hormone (Gn-RH) neurosecretory activity, which could explain long- and short-term variations of the gonadotropin secretion. There is no biological species specificity between mammal and fish Gn-RH; although there is a structural difference, they are, on the cont...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(86)90255-8
更新日期：1986-01-01 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
pub_type： 杂志文章
doi：10.1016/s0016-6480(03)00261-2
更新日期：2003-11-01 00:00:00
abstract：:There are more CRH-like immunoreactive neurons in the preoptic nucleus and nucleus lateralis tuberis in the brain of feral brown trout, Salmo trutta, living in cadmium- and zinc-contaminated regions of the Eagle River than in fish from an uncontaminated control site. Histological analyses revealed that interrenal cell...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1997.7000
更新日期：1997-12-01 00:00:00
abstract：:European silver eels are thought to undergo sexual maturation during their oceanic reproductive migration from the European continent to their spawning area in the Sargasso Sea. Tracking data and various anatomical and physiological features suggest that silver eels migrate in deep sea, leading us to hypothesise that ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2007.01.009
更新日期：2007-08-01 00:00:00
abstract：:Plasma concentrations of stress hormones [adrenaline (ADR), noradrenaline (NR)], lactate, glucose and CO2 were monitored during peak nesting period (May-October) at different phases of nesting in the green turtle, Chelonia mydas. These include, emergence from sea, excavating body and nest chambers, oviposition, coveri...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2007.09.012
更新日期：2008-02-01 00:00:00
abstract：:In fish, melatonin is reported to be produced mainly in the pineal organ, but there is also evidence for the presence of melatonin in a number of extrapineal sites where it could act as an intracellular mediator or paracrine signal. The present study use the reverse transcription-polymerase chain reaction (RT-PCR) to ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2006.12.008
更新日期：2007-06-01 00:00:00
abstract：:Gonadotropin-releasing hormone (GnRH) of vertebrates is now believed to have multiple functions in addition to its role as a hypophysiotropic hormone, as originally defined. Recently, it has been shown that GnRH occurs also in the ascidians, which are considered ancestral chordates. Here the author shows that GnRH ind...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.2001.7728
更新日期：2001-12-01 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
pub_type： 杂志文章
doi：10.1006/gcen.1995.1046
更新日期：1995-04-01 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
pub_type： 杂志文章
doi：10.1016/j.ygcen.2015.09.024
更新日期：2016-01-01 00:00:00
abstract：:Growing evidence shows that sex steroids not only act within the individual whose glands produce them; they can also act on proximate conspecifics. Previous studies show that exogenous 17β-estradiol (E2) can be absorbed both nasally and percutaneously, arriving in blood, neural, reproductive, and peripheral tissues. W...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2019.113321
更新日期：2020-01-15 00:00:00
abstract：:Seasonal changes in testicular structure and function in three species of Korean frogs (Rana nigromaculata, R. rugosa, and R. dybowskii) having different breeding seasons and habitats were examined throughout the year. R. nigromaculata live in rice fields and breed in early May. Their gonadosomatic index (GSI) and tes...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1998.7118
更新日期：1998-09-01 00:00:00
abstract：:Seasonal and daily variation in basal plasma concentrations of corticosterone and the effect of short-term confinement on plasma corticosterone concentration were examined in wild adult male and female tuatara (Sphenodon punctatus) on Stephens Island, New Zealand. Males and females sampled immediately upon capture at ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.1997.7051
更新日期：1998-05-01 00:00:00
abstract：:Melanophore-stimulating hormone (MSH) release from the pars intermedia of the pituitary gland is probably regulated by multiple factors of hypothalamic origin. We have examined a number of potential regulatory factors for their effects on MSH release from the amphibian Xenopus laevis. Serotonin and acetylcholine have ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(86)90148-6
更新日期：1986-09-01 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
pub_type： 杂志文章
doi：10.1006/gcen.1996.0145
更新日期：1996-10-01 00:00:00
abstract：:Prostaglandin F2 alpha (PGF2 alpha), progesterone, androgens (testosterone + dihydrotestosterone), and 17 beta-estradiol were measured in the plasma of male frogs, Rana esculenta, by radioimmunoassays. Plasma concentrations of PGF2 alpha were higher from October to December and peaked in March (prereproduction) and in...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(91)90307-r
更新日期：1991-06-01 00:00:00
abstract：:Corticosterone, progesterone, estradiol-17 beta, and estrone were quantified in plasma collected weekly (April-September) from renesting and nonlaying female American kestrels (Falco sparverius) paired with males in captivity. Hormone levels and body weights for laying females were maximal during courtship and egg-lay...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(86)90048-1
更新日期：1986-06-01 00:00:00
abstract：:Insulin (INS) plays a critical role in the growth, development, and metabolism of vertebrates. In this study, a cDNA encoding a novel insulin receptor (IR) subtype was isolated, cloned, and sequenced from the liver of rainbow trout. A 1525-bp cDNA encoding a partial amino acid sequence of the β-subunit including the t...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2010.09.005
更新日期：2010-12-01 00:00:00
abstract：:Insulin, glucagon, somatostatin-14, and three structurally related molecular forms of peptide tyrosine-tyrosine (PYY) were isolated from an extract of the combined pancreas and gastrointestinal tract of the pallid sturgeon, Scaphirhynchus albus. Pallid sturgeon insulin was identical to insulin from the Russian sturgeo...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1006/gcen.2000.7571
更新日期：2000-12-01 00:00:00
abstract：:The binding of 125I-labeled ovine prolactin (oPRL) to membrane preparations of several tissues from the male green frog, Rana esculenta, collected during the year is reported. PRL binding to kidney fractions was generally high (range 5-45%). A maximum was observed in the month of October, whereas the lowest value was ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/0016-6480(87)90053-0
更新日期：1987-10-01 00:00:00
abstract：:This study aimed at investigating the role of sexual steroids in the regulation of the expression of the single aromatase gene and steroid receptor subtypes in the brain-pituitary-ovarian axis of the Japanese eel. Unlike other teleosts, which possess duplicated genes for aromatase, cyp19a1a and cyp19a1b, expressed in ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2011.11.005
更新日期：2012-01-01 00:00:00
abstract：:The present study was undertaken to characterize different vitellogenins in Channa punctatus. Protein purification by gel chromatography followed by fast protein liquid chromatography (FPLC) revealed existence of two different Vg forms. Liquid chromatography tandem mass spectrophotometry (LC-MS/MS) suggested the exist...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2013.05.002
更新日期：2013-08-01 00:00:00
abstract：:As an alternative to radioimmunoassays, a simple, highly sensitive and quick enzymeimmunoassay (EIA) for determination of testosterone in blood plasma of yaks on microtitreplates using second antibody coating technique and testosterone-horseradish peroxidase as a label has been developed for the first time. The wells ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2008.07.007
更新日期：2008-09-15 00:00:00
abstract：:Chemical signals (both volatile and non-volatile) form the major communication channels in animals. These signals are transferred mainly through excretory sources to facilitate inter-individual communication. In particular, the reproductive cycle of female mammals, including goats, exhibits significant changes in the ...
journal_title：General and comparative endocrinology
pub_type： 杂志文章
doi：10.1016/j.ygcen.2014.07.028
更新日期：2014-09-15 00:00:00
abstract：:Thyroxine (T(4)) and triiodothyronine (T(3)), the principal thyroid hormones (THs) secreted from the hypothalamic-pituitary-thyroid (HPT) axis, produce a plethora of physiologic actions in fish. The diverse actions of THs in fishes are primarily due to the sensitivity of thyroid axis to many physical, chemical and bio...
journal_title：General and comparative endocrinology
pub_type： 杂志文章,评审
doi：10.1016/j.ygcen.2011.02.023
更新日期：2011-06-01 00:00:00
