Differential regulation of gonadotropins (FSH and LH) and growth hormone (GH) by neuroendocrine, endocrine, and paracrine factors in the zebrafish--an in vitro approach.

abstract：:Endocrine cells in the gut of Sparus auratus L. (gilt-head sea bream) have been demonstrated by immunocytochemical and electron microscopic techniques. Cells showing somatostatin and gastrin-like immunoreactivity were found in the depth of the gastric folds and in the upper part of the stomach glands while substance P...

journal_title：General and comparative endocrinology

authors： Elbal MT,Agulleiro B

更新日期：1986-12-01 00:00:00

abstract：:Pregnancy and lactation are key times in the life of female mammals when energetic resources must be brought to bear to produce and nurture offspring. Changes in glucocorticoid (GC) levels are central to this objective, due to their roles in modulating development and physiology and in mediating energetic tradeoffs. W...

journal_title：General and comparative endocrinology

authors： Edwards PD,Boonstra R

更新日期：2016-06-01 00:00:00

abstract：:Four monoclonal antibodies (MA-5, MA-10, MA-20, and MA-51) and one polyclonal antibody (ARS-2) against human insulin receptor were used to immunoprecipitate the insulin receptor from several species which had been photolabeled with N epsilon B29-monoazido-benzoyl-[125I]iodoinsulin. All four monoclonal antibodies immun...

journal_title：General and comparative endocrinology

authors： Tong ZQ,Jack E,Moule M,Goldfine ID,Yip CC

更新日期：1994-06-01 00:00:00

abstract：:Two forms of immunoreactive gonadotropin-releasing hormone (GnRH) were extracted from brain-pituitary tissues of Thai catfish, Clarias macrocephalus and C. batrachus. The peptides were detected using high performance liquid chromatography (HPLC) and radioimmunoassay (RIA). In both the HPLC systems, catfish GnRH-I elut...

journal_title：General and comparative endocrinology

authors： Ngamvongchon S,Sherwood NM,Warby CM,Rivier JE

更新日期：1992-08-01 00:00:00

abstract：:Studies of the ontogeny of IGF-I mRNA during embryonic and larval development of the gilthead sea bream Sparus aurata showed its expression during these early developmental stages. The present study applies in situ hybridization to localize IGF-I and IGF receptor mRNAs in 16-day larvae of S. aurata. Paraffin sections ...

journal_title：General and comparative endocrinology

authors： Funkenstein B,Almuly R,Chan SJ

更新日期：1997-09-01 00:00:00

abstract：:Steroid hormone assessment using non-invasive sample collection techniques can reveal the reproductive status of aquatic mammals and the physiological mechanisms by which they respond to changes in their environment. A portion of the eastern North Pacific blue whale (Balaenoptera musculus) population that seasonally v...

journal_title：General and comparative endocrinology

authors： Valenzuela-Molina M,Atkinson S,Mashburn K,Gendron D,Brownell RL Jr

更新日期：2018-05-15 00:00:00

abstract：:Insulin-like androgenic gland hormone-binding protein (IAGBP) has been investigated in crustaceans in vitro. However, the relationship between IAGBP and its putative binding protein partner insulin-like androgenic gland hormone (IAG) has not been studied at the transcriptional level in vivo. In the current study, we c...

journal_title：General and comparative endocrinology

authors： Li F,Bai H,Xiong Y,Fu H,Jiang S,Jiang F,Jin S,Sun S,Qiao H,Zhang W

更新日期：2015-05-15 00:00:00

abstract：:In captivity, the adrenocortical stress response can be permanently altered by events that occur during early life. Free-living animals have rarely been examined in this regard. To examine whether early-life events impact the hypothalamo-pituitary-adrenal (HPA) axis in the natural setting, we evaluated the stress resp...

journal_title：General and comparative endocrinology

authors： Landys MM,Goymann W,Slagsvold T

更新日期：2011-11-01 00:00:00

abstract：:Gonadotrophin-releasing hormone (GnRH) is primarily related to reproductive processes in vertebrates. However other physiological roles, including functions in food intake regulation and energy status, have been demonstrated for GnRH in animals. The ten amino acid active peptide is relatively conserved throughout chor...

journal_title：General and comparative endocrinology

authors： Tuziak SM,Volkoff H

更新日期：2013-04-01 00:00:00

abstract：:The reproductive biology of the Indian major carp Cirrhinus mrigala is tightly synchronized with the seasonal changes in the environment. While the ovaries show growth from February through June, the fish spawn in July-August to coincide with the monsoon; thereafter the fish pass into the postspawning and resting phas...

journal_title：General and comparative endocrinology

authors： Biju KC,Singru PS,Schreibman MP,Subhedar N

更新日期：2003-10-01 00:00:00

abstract：:The skeletal muscles of ectothermic vertebrates possess an elevated glyconeogenic capacity that is responsible for a major portion of lactate removal and glycogen resynthesis following exercise. In lizards, changes in plasma hormone levels and the influence of differing hormone levels on muscle metabolism postexercise...

journal_title：General and comparative endocrinology

authors： Scholnick DA,Weinstein RB,Gleeson TT

更新日期：1997-05-01 00:00:00

abstract：:Insulin-like growth factor I (IGF-I) plays a key role in the complex system that regulates bony fish growth, differentiation, and reproduction. The major source of circulating IGF-I is liver, but IGF-I-producing cells also occur in other organs, including the gonads. Because no data are available on the potential prod...

journal_title：General and comparative endocrinology

authors： Berishvili G,D'Cotta H,Baroiller JF,Segner H,Reinecke M

更新日期：2006-05-01 00:00:00

abstract：:Ecdysteroid production by the prothoracic glands of the tobacco hornworm, Manduca sexta was found to be under feedback control by the ecdysteroids in hemolymph using both culture in vivo in diapausing pupae lacking the brain-corpora cardiaca-corpora allata complex and the prothoracic glands and culture in vitro. Proth...

journal_title：General and comparative endocrinology

authors： Sakurai S,Williams CM

更新日期：1989-08-01 00:00:00

abstract：:Pregnant female spiny dogfish were captured off the coasts of Maine and Massachusetts and morphometric and gravimetric analyses of the liver, gonad, and reproductive tract correlated with the reproductive cycle. Plasma samples were taken and circulating steroids (progesterone, testosterone, and estradiol) were measure...

journal_title：General and comparative endocrinology

authors： Tsang PC,Callard IP

更新日期：1987-05-01 00:00:00

abstract：:Stress-induced inhibition of innate immune activity has been observed in a variety of wild birds and may increase chances of infection because this activity constitutes the first line of defense against pathogens. We previously reported that the transient elevation of plasma corticosterone (CORT; the primary avian glu...

journal_title：General and comparative endocrinology

authors： Gao S,Deviche PJ

更新日期：2019-05-01 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：:The factors influencing prolactin (PRL) variation in birds and in wildlife in general have rarely been investigated with respect to the physiological impacts of exposure to environmental contaminants. We investigated the associations between circulating baseline PRL levels and concentrations of eight persistent organo...

journal_title：General and comparative endocrinology

authors： Verreault J,Verboven N,Gabrielsen GW,Letcher RJ,Chastel O

更新日期：2008-05-01 00:00:00

abstract：:Insulin-like growth factor-1 (IGF-1) is a member of the vertebrate insulin/insulin-like growth factor/relaxin gene family necessary for growth, reproduction, and survival at both the cellular and organismal level. Its sequence, protein structure, and function have been characterized in mammals, birds, and fish; howeve...

journal_title：General and comparative endocrinology

authors： Sparkman AM,Schwartz TS,Madden JA,Boyken SE,Ford NB,Serb JM,Bronikowski AM

更新日期：2012-08-01 00:00:00

abstract：:Age-related changes in the concentration of factors like TGF-1β, DHEA-S and IGF-1 may increase the risk of disease and illnesses in advanced life. A better understanding of these changes would aid in the development of more appropriate treatments and/or preventative care for many conditions associated with age. Due to...

journal_title：General and comparative endocrinology

authors： Willis EL,Wolf RF,White GL,McFarlane D

更新日期：2014-01-01 00:00:00

abstract：:Growth hormone (GH) is a key factor controlling postnatal growth and development. Despite growth-promoting effects in mammals, GH is not associated with muscle growth in the chicken. Janus kinase 2 (JAK2) has been identified as the first intracellular step in GH receptor (GHR) signaling in many species, however, there...

journal_title：General and comparative endocrinology

authors： Zhou Y,Wang X,Hadley J,Corey SJ,Vasilatos-Younken R

更新日期：2005-11-01 00:00:00

abstract：:Cytochrome P450 17A1 (P450c17) is the key enzyme required for the production of androgenic sex steroids by converting progestogens to androgens. 5α-reductases are enzymes that convert testosterone (T) to dihydrotestosterone (DHT), which has a greater affinity for androgen receptors (AR) and stronger action than T. Our...

journal_title：General and comparative endocrinology

authors： Han W,Xie W,Zhang Y,Zhang F,Zhang H,Han Y,Yuan Z,Weng Q

更新日期：2017-12-01 00:00:00

abstract：:Three distinct thyroid hormone receptor (TR) cDNAs (gTRalphaA, gTRalphaB and gTRbeta) were cloned and sequenced in orange-spotted grouper (Epinephelus coioides). The cDNA of gTRalphaA consisted of 1555-bp and encoded a putative protein of 416 amino acids, while the cDNA of gTRalphaB consisted of 1459-bp and encoded 39...

journal_title：General and comparative endocrinology

authors： Tang X,Liu X,Zhang Y,Zhu P,Lin H

更新日期：2008-11-01 00:00:00

abstract：:This paper describes changes in the content of free steroid hormones e.g. testosterone (T), estradiol-17β (E2), estrone (E1) and estriol (E3) of Mytilus trossulus from the southern Baltic Sea as a function of season, stage of gametogenesis, sex, tissue (gonadal and somatic) and depth. The highest levels of T, E2, E1 a...

journal_title：General and comparative endocrinology

authors： Smolarz K,Zabrzańska S,Konieczna L,Hallmann A

更新日期：2018-04-01 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

authors： Tyrrell CL,Cree A

更新日期：1998-05-01 00:00:00

abstract：:Key peptide hormones involved in the control of appetite in vertebrates were identified, their genes characterized and their regulation studied in Atlantic salmon: two agouti-related proteins (AgRP), cocaine- and amphetamine-regulated transcript (CART) and neuropeptide Y (NPY). The AgRP-1 and AgRP-2 genes encode prepr...

journal_title：General and comparative endocrinology

authors： Murashita K,Kurokawa T,Ebbesson LO,Stefansson SO,Rønnestad I

更新日期：2009-06-01 00:00:00

abstract：:The present study examined plasma concentrations of insulin-like growth factor (IGF)-I, IGF-II and IGF-binding proteins (IGFBPs) during posthatch growth and development in chickens. Three distinct proteins which bound 125I-IGF-I were observed irrespective of age or sex, these having apparent molecular weights of 22, 2...

journal_title：General and comparative endocrinology

authors： Radecki SV,Capdevielle MC,Buonomo FC,Scanes CG

更新日期：1997-07-01 00:00:00

abstract：:Variation in food intake affects somatic growth by altering the expression of hormones in the somatotropic endocrine axis including insulin-like growth factor-1 (IGF-1). Here, we examined IGF-1 pathway responses to long- and short-term variation in food availability in copper rockfish (Sebastes caurinus), a nearshore ...

journal_title：General and comparative endocrinology

authors： Hack NL,Cordova KL,Glaser FL,Journey ML,Resner EJ,Hardy KM,Beckman BR,Lema SC

更新日期：2019-09-01 00:00:00

abstract：:Insulin and IGF-I binding has been studied in brown trout (Salmo trutta) wheat germ agglutinin semipurified receptors from embryos (organogenesis), larvae (yolk sac), juveniles (2.98 +/- 0.21 g bw) and adults (111.6 +/- 6.92 and 522 +/- 53 g bw). Embryos and larvae were sampled at 5 and 12 weeks after fertilization (D...

journal_title：General and comparative endocrinology

authors： Méndez E,Smith A,Figueiredo-Garutti ML,Planas JV,Navarro I,Gutiérrez J

更新日期：2001-05-01 00:00:00

abstract：:This paper presents a first-time report on the localization, structure and seasonal secretory activity of the Y-organ of a grapsid brachyuran crab (Metopograpsus messor). Having exhibited discrete seasonality with reference to the programming of molt and reproduction, this brachyuran crab has offered us an excellent m...

journal_title：General and comparative endocrinology

authors： Shyamal S,Sudha K,Gayathri N,Anilkumar G

更新日期：2014-01-15 00:00:00

abstract：:In addition to the previously recognised thyroid hormone-binding proteins, three plasma components possibly involved in T3 and T4 transport have been identified in chicken plasma using gel filtration at pH 7.4. In mature female, though not male and immature female birds, a significant amount of T3 (11%) is bound to ve...

journal_title：General and comparative endocrinology

authors： Mitchell MA,Stiles MS

更新日期：1985-02-01 00:00:00