Development of the rhythmic melatonin secretion in the embryonic chicken pineal gland.

abstract：:Dihydrotestosterone (DHT) and 17β-estradiol (E2) are sex hormones that regulate human hair follicle (HF) growth and are produced by peripheral reduction and aromatization of testosterone. However, the expression patterns of DHT and E2 synthesis-related proteins and their receptors in male yak skin during different HF ...

journal_title：General and comparative endocrinology

authors： Song L,Cui Y,Xiao L,Yu S,He J

更新日期：2020-01-15 00:00:00

abstract：:The existence of direct progestin actions on teleost sperm to stimulate hypermotility is not widely acknowledged because it has only been demonstrated in members of the family Sciaenidae. In the present study, progestin stimulation of sperm hypermotility was investigated in a non-sciaenid, southern flounder, and the p...

journal_title：General and comparative endocrinology

authors： Tubbs C,Tan W,Shi B,Thomas P

更新日期：2011-02-01 00:00:00

abstract：:A clone encoding thyroid hormone receptor-beta (TR-beta) was isolated from a sea bream (Sparus aurata) ovary cDNA library. Sea bream (sb)TR-beta is closely related to its counterparts from other vertebrates and, like them, preferentially binds T3 rather than T4. However, the putative sbTR-beta protein contains a nine-...

journal_title：General and comparative endocrinology

authors： Nowell MA,Power DM,Canario AV,Llewellyn L,Sweeney GE

更新日期：2001-07-01 00:00:00

abstract：:An earlier study reported that blinding or exposure to red light stimulates reproduction in R. cyanophlyctis. The present study investigates whether melatonin counteracted blinding- or red-light-induced ovarian stimulation. The study consisted of two experiments carried out during the prebreeding (March/April) and bre...

journal_title：General and comparative endocrinology

authors： Joshi BN,Udaykumar K

更新日期：2000-04-01 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：: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：:Undifferentiated spermatogonia (Aund) or spermatogonial stem cells (SSCs) are committed to the establishment and maintenance of spermatogenesis and fertility throughout a male's life and are located in a highly specialized microenvironment called niche that regulates their fate. Although several studies have been deve...

journal_title：General and comparative endocrinology

authors： Costa GMJ,Sousa AL,Figueiredo AFA,Lacerda SMSN,França LR

更新日期：2019-03-01 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：:Seabird productivity is shaped by marine resource availability. We examined the link between seabird productivity and an indirect measure of food availability: baseline plasma corticosterone. We predicted low productivity would coincide with elevated baseline corticosterone levels in Black-legged Kittiwakes (Rissa tri...

journal_title：General and comparative endocrinology

authors： Buck CL,O'Reilly KM,Kildaw SD

更新日期：2007-02-01 00:00:00

abstract：:The Harderian gland of the lizard Podarcis sicula sicula (Raf) contains connective tissue type mast cells whose numbers vary during the year showing two peaks, one in spring the other in winter. No sex differences are found throughout the year. Thermal and photoperiodic manipulations indicate that only temperature inf...

journal_title：General and comparative endocrinology

authors： Vitiello II,Baccari GC,Di Matteo L,Rusciani A,Chieffi P,Minucci S

更新日期：1997-09-01 00:00:00

abstract：:Numerous endocrine disrupting chemicals can affect the growth and development of amphibians. We investigated the effects of a targeted disruption of the endocrine axes modulating development and somatic growth. Wood frog (Lithobates sylvaticus) tadpoles were exposed for 2weeks (from developmental Gosner stage (Gs) 25 ...

journal_title：General and comparative endocrinology

authors： Bulaeva E,Lanctôt C,Reynolds L,Trudeau VL,Navarro-Martín L

更新日期：2015-10-01 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：:In the teleost brain, radial glial cells (RGCs) are the main macroglia and are stem-like progenitors that express key steroidogenic enzymes, including the estrogen-synthesizing enzyme, aromatase B (cyp19a1b). As a result, RGCs are integral to neurogenesis and neurosteroidogenesis, however little is known about the reg...

journal_title：General and comparative endocrinology

authors： Da Fonte DF,Xing L,Mikwar M,Trudeau VL

更新日期：2018-02-01 00:00:00

abstract：:The relationships between testicular and plasma hormone levels and the decline in fertility in aging roosters were examined. Body mass, testicular mass, and fertility were measured in roosters from 20 to 72 weeks of age. Plasma was assayed for LH and testosterone, and estradiol and testicular extracts were assayed for...

journal_title：General and comparative endocrinology

authors： Weil S,Rozenboim I,Degen AA,Dawson A,Friedländer M,Rosenstrauch A

更新日期：1999-07-01 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

authors： Gobbetti A,Zerani M,Bolelli GF,Botte V

更新日期：1991-06-01 00:00:00

abstract：:We have examined the effect of ambient water temperature on the ability of juvenile rainbow trout to respond to estradiol (E2) injection with vitellogenin (Vg) synthesis. Vg appeared in serum within 24 hr of E2 injection in fish kept at 15 degrees and rose to 70 mg/ml over a 10-day treatment period during which four i...

journal_title：General and comparative endocrinology

authors： Mackay ME,Lazier CB

更新日期：1993-02-01 00:00:00

abstract：:Serum prolactin (PRL) and luteinizing hormone (LH) levels from mature female turkeys were determined following ovariectomy and daily subcutaneous injections for 4 or 9 days of 0.002-2.0 mg/kg estradiol benzoate (EB), 0.05-2.0 mg/kg progesterone (P), or their combinations. Serum PRL levels were increased (P less than 0...

journal_title：General and comparative endocrinology

authors： El Halawani ME,Silsby JL,Fehrer SC,Behnke EJ

更新日期：1983-10-01 00:00:00

abstract：:Migratory birds undergo metabolic remodeling in tissues, including increased lipid storage in white adipose and fatty acid uptake and oxidation in skeletal muscle, to optimize energy substrate availability and utilization in preparation for long-distance flight. Different tissues undergo gene expression changes in kee...

journal_title：General and comparative endocrinology

authors： Hamilton A,Ly J,Robinson JR,Corder KR,DeMoranville KJ,Schaeffer PJ,Huss JM

更新日期：2018-11-01 00:00:00

abstract：:Sex pheromones rapidly affect endocrine physiology and behaviour, but little is known about their effects on gene expression in the neural tissues that mediate olfactory processing. In this study, we exposed male goldfish for 6h to waterborne 17,20βP (4.3 nM) and PGF2α (3 nM), the main pre-ovulatory and post-ovulatory...

journal_title：General and comparative endocrinology

authors： Lado WE,Zhang D,Mennigen JA,Zamora JM,Popesku JT,Trudeau VL

更新日期：2013-10-01 00:00:00

abstract：:In teleosts, sex is plastic and is influenced by environmental factors. Elevated temperatures have masculinizing effects on the phenotypic sex of certain sensitive species. In this study, we reared genetic XX Japanese flounder at a high temperature (27.5 ± 0.5 °C) and obtained a population of sex-reversal XX males (ma...

journal_title：General and comparative endocrinology

authors： Yang Y,Liu Q,Xiao Y,Xu S,Wang X,Yang J,Song Z,You F,Li J

更新日期：2019-04-01 00:00:00

abstract：:The secretory response of the nasal salt gland of the north African agamid lizard Uromastix acanthinurus to injections of 1 M KCl and NaCl is correlated with changes in circulating levels of the corticosteroids aldosterone and corticosterone. KCl loading led to a progressive rise in plasma aldosterone levels, and NaCl...

journal_title：General and comparative endocrinology

authors： Bradshaw SD,Lemire M,Vernet R,Grenot CJ

更新日期：1984-05-01 00:00:00

abstract：:We have previously characterized the response to gonadotropin-releasing hormone (Gnrh) 2 in luteinizing hormone (lhb)-expressing cells from green fluorescent protein (Gfp)-transgenic medaka (Oryzias latipes), with regard to changes in the cytosolic Ca(2+) concentration. In the current study we present the correspondin...

journal_title：General and comparative endocrinology

authors： Strandabø RA,Grønlien HK,Ager-Wick E,Nourizadeh-Lillabadi R,Hildahl JP,Weltzien FA,Haug TM

更新日期：2016-04-01 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：:High plasma levels of testosterone at the beginning of the breeding season adjust male physiology for mating and promote territorial behavior in birds. Conversely intra-sexual competition may elicit a temporary increase in circulating testosterone. Male black redstarts (Phoenicurus ochruros) from migratory populations...

journal_title：General and comparative endocrinology

authors： Villavicencio CP,Blas J,Goymann W

更新日期：2014-09-01 00:00:00

abstract：:Wrasse species exhibit a definite daily rhythm in locomotor activity and bury themselves in the sand at the bottom of the ocean at night. It remains unclear how their behavior in locomotor activity is endogenously regulated. The aim of the present study was to clarify the involvement of melatonin and clock genes (Per1...

journal_title：General and comparative endocrinology

authors： Hur SP,Takeuchi Y,Itoh H,Uchimura M,Takahashi K,Kang HC,Lee YD,Kim SJ,Takemura A

更新日期：2012-05-15 00:00:00

abstract：:In mammals ghrelin has a diverse range of effects including stimulation of gut motility but although present in teleost fish its effects on motility have not been investigated. The present study used bioinformatics to search for fish paralogues of the ghrelin receptor and the closely related motilin receptor, and inve...

journal_title：General and comparative endocrinology

authors： Olsson C,Holbrook JD,Bompadre G,Jönsson E,Hoyle CH,Sanger GJ,Holmgren S,Andrews PL

更新日期：2008-01-01 00:00:00

abstract：:The effect of an exogenous glucocorticoid on the lipid metabolism and fatty acid pattern of skeletal muscle in broiler chickens (Gallus gallus domesticus) was investigated in vivo and in vitro. Male Arbor Acres chickens were subjected to dexamethasone (DEX) treatment for 3days. We found that DEX retarded body growth, ...

journal_title：General and comparative endocrinology

authors： Wang XJ,Song ZG,Jiao HC,Lin H

更新日期：2012-12-01 00:00:00

abstract：:Adiponectin is a novel adipocyte-derived hormone with low circulating concentrations and/or mRNA expression in obesity and non-alcoholic fatty liver disease (NAFLD). The adiponectin mRNA of several Carnivora species was sequenced to enable further gene expression studies in this clade with potential experimental speci...

journal_title：General and comparative endocrinology

authors： Nieminen P,Rouvinen-Watt K,Kapiainen S,Harris L,Mustonen AM

更新日期：2010-09-15 00:00:00

abstract：:Acute stress in vertebrates generally stimulates the hypothalamo-pituitary-adrenal axis and is often associated with multiple metabolic changes, such as increased gluconeogenesis, and with behavioral alterations. Little information is available, especially in free-ranging organisms, on the duration of these reversible...

journal_title：General and comparative endocrinology

authors： Deviche P,Bittner S,Davies S,Valle S,Gao S,Carpentier E

更新日期：2016-08-01 00:00:00

abstract：:Plasma and gonadal levels of several gonadal steroids (testosterone, 11-ketotestosterone, androstenedione, 11 beta-hydroxyandrostenedione, 17 beta-estradiol, and estrone) were measured by RIA in the protandrous seabass, Lates calcarifer, throughout an annual reproductive cycle. Twenty to 25 fish were killed every mont...

journal_title：General and comparative endocrinology

authors： Guiguen Y,Jalabert B,Thouard E,Fostier A

更新日期：1993-12-01 00:00:00