11,003 results match your criteria General and Comparative Endocrinology[Journal]


Expressional regulation of gonadotropin receptor genes and androgen receptor genes in the eel testis.

Gen Comp Endocrinol 2019 Apr 19. Epub 2019 Apr 19.

Department of Zoology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand.

Receptors for follicle-stimulating hormone (Fshr), luteinizing hormone (Lhcgr1 and Lhcgr2) and androgens (Ara and Arb) transduce the hormonal signals that co-ordinate coordinate spermatogenesis, but the factors that regulate the abundance of these transducers in fish testes remain little-understood. To mend this paucity of information, we first determined changes in transcript abundance for these receptors (fshr, lhcgr1, ara and arb) during spermatogenesis induced by human chorionic gonadotropin (hCG) injection in the eel, Anguilla australis. We related our findings to testicular production of the fish androgen, 11-ketotestosterone (11-KT), and to the levels of the transcripts encoding steroidogenic acute regulatory protein (star) and 11β-hydroxylase (cyp11b), and subsequently evaluated the effects of hCG or 11-KT on mRNA levels of these target genes in vitro. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.020DOI Listing

Faecal metabolites and Hair cortisol as biological markers of HPA-axis activity in the Rocky Mountain Goat.

Gen Comp Endocrinol 2019 Apr 19. Epub 2019 Apr 19.

Reproductive Physiology, Toronto Zoo, 361A Old Finch Avenue, Toronto, Ontario, M1B 5K7, Canada.

Monitoring glucocorticoid in faeces and hair is increasingly used in ecological studies and provides a powerful and minimally intrusive mean to identify physiological challenges faced by wild animals. Using a cortisol and a corticosterone immunoassays, we conducted an adrenocorticotropic (ACTH) challenge with five weekly repeated injections to validate the use of faecal glucocorticoid metabolites and hair cortisol concentration as biological markers of the HPA-axis activity in captive mountain goats (Oreamnos americanus). We also investigated the effect of endogenous (age, sex, reproductive status) and methodological (faecal sample collection date, freezing delay and hair type) variables on cortisol values using faecal and hair samples collected from marked wild mountain goats during a long-term study. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.022DOI Listing

Corrigendum to "An experimental examination of interindividual variation in feather corticosterone content in the house sparrow, Passer domesticus in southeast Australia" [Gen. Comp. Endocrinol. 244 (2017) 93-100].

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Locked Bag 20000, Geelong, VIC 3220, Australia.

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http://dx.doi.org/10.1016/j.ygcen.2019.04.007DOI Listing

Do glucocorticoids or carotenoids mediate plumage coloration in parrots? An experiment in Platycercus elegans.

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Australia; School of Biological Sciences, University of Bristol, United Kingdom; School of Biosciences, Cardiff University, United Kingdom.

Conspicuous coloration can indicate phenotypic quality, and may reflect exposure or vulnerability to stress, or access to essential nutrients such as pigments. Although the production of pigmented colours is well understood, much less is known about how structural colours are affected by physiological state. In this study, we tested whether glucocorticoids (corticosterone) predicted expression of plumage coloration in an Australian parrot, the crimson rosella (Platycercus elegans). Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.014DOI Listing

Effect of estradiol on hepatopancreatic lipid metabolism in the swimming crab, Portunus trituberculatus.

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China; Centre for Research on Environmental Ecology and Fish Nutrition of Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai, 201306, China; National Demonstration Centre for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China. Electronic address:

Estradiol is an important sex steroid hormone that involved in regulation of animal lipid metabolism. However, the effect of estradiol on lipid metabolism in swimming crab (Portunus trituberculatus) is unclear. The present study investigated the effect of four concentrations of exogenous estradiol (0, 0. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480183058
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http://dx.doi.org/10.1016/j.ygcen.2019.04.019DOI Listing
April 2019
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Inhibitory action of thymol on fecal microbial activity in Tamandua tetradactyla and its effect on glucocorticoid metabolite measurement.

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

Instituto de Ciencia y Tecnología de los Alimentos and Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN), Universidad Nacional de Córdoba (UNC), Argentina.

Faecal glucocorticoid measurement is a potentially important tool for improving wildlife conservation, but its use is still limited by methodological issues including the need to avoid modifications of steroids by faecal microorganisms during storage. The freezing of faeces is recommended as a means of avoiding such alterations, but this is costly under non-controlled environmental conditions. The present study was designed to determine whether the application of thymol reduced the proliferation of microorganisms in the faeces of Tamandua tetradactyla and whether it influenced faecal glucocorticoid metabolite (FGM) measurements. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480183024
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http://dx.doi.org/10.1016/j.ygcen.2019.04.015DOI Listing
April 2019
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Methylation status and expression patterns of myomaker gene play important roles in postnatal development in the Japanese flounder (Paralichthys olivaceus).

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, Qingdao 266003, China. Electronic address:

Myomaker is a membrane protein that plays a crucial role in the fusion of myoblasts during muscle growth. DNA methylation, a significant factor, regulates gene expression. The aim of this study was to examine the methylation and mRNA expression patterns of the myomaker gene during 8 different postnatal development stages in the Japanese flounder (L: 7 days post hatch (dph); M1: 21 dph; M2: 28 dph; M3: 35 dph; J1: 90 dph; J2: 180 dph; A1: 24 months; A2: 36 months). Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480183056
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http://dx.doi.org/10.1016/j.ygcen.2019.04.017DOI Listing
April 2019
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Molecular identification of GnIH and its potential role in reproductive physiology and male pregnancy of the lined seahorse (Hippocampus erectus).

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

CAS Key Laboratory ofTropical Marine Bio-resourcesand Ecology (LMB), Guangdong Provincial Key Laboratory of Applied Marine Biology (LAMB), South China Sea Institute of Oceanology, Institute of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China. Electronic address:

The gonadotropin-inhibitory hormone (GnIH) plays a negative role in the hypothalamic-pituitary-gonadal (HPG) axis by inhibiting gonadotropin secretion in vertebrates. Male pregnancy and ovoviviparous behavior are unique phenomena among vertebrates. To better understand the neuroendocrine regulatory mechanisms in ovoviviparous fish with male pregnancy, we identified the orthologous GnIH gene in the lined seahorse (Hippocampus erectus). Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.018DOI Listing

Redox homeostasis in a rodent model of circadian disruption: Effect of melatonin supplementation.

Gen Comp Endocrinol 2019 Apr 16. Epub 2019 Apr 16.

Department of Biochemistry, University of Allahabad, Allahabad 211002, India. Electronic address:

Continuous light or dark photoperiods are the leading cause of disruption in the circadian rhythm of day-night cycle. The purpose of this study was to understand the cellular redox balance in a model of circadian disrupted rat model and determine the effect of melatonin supplementation. Young male Wistar rats were randomly divided into five groups (n = 4). Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480193008
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http://dx.doi.org/10.1016/j.ygcen.2019.04.016DOI Listing
April 2019
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Professor Sir Vincent B. Wigglesworth, C.B.E., M.D., F.R.S. (1899-1994) 25 years on: His legacy and lessons for modern times.

Authors:
Colin G H Steel

Gen Comp Endocrinol 2019 Apr 11. Epub 2019 Apr 11.

York University, Toronto, Canada. Electronic address:

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http://dx.doi.org/10.1016/j.ygcen.2019.04.009DOI Listing

HPA axis regulation and stress response is subject to intergenerational modification by paternal trauma and stress.

Gen Comp Endocrinol 2019 Apr 11. Epub 2019 Apr 11.

Department of Anatomy & Neuroscience, University of Melbourne, VIC 3010, Australia; Florey Institute of Neurosciences and Mental Health, University of Melbourne, VIC 3010, Australia. Electronic address:

There is increasing evidence that one's risk for psychiatric disturbances and metabolic syndromes is influenced by their parents' own health history, lifestyle and living environment. For example, paternal high fat diet is strongly linked to neuroendocrine dysregulation in offspring and increased risk for diabetes. The potential intergenerational impact of paternal stress has only just begun to emerge, with the initial evidence suggestive of greater risk for anxiety-related disorders. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.010DOI Listing
April 2019
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The effects of neuromedin S on the hypothalamic-pituitary-testicular axis in male pigs in vitro.

Gen Comp Endocrinol 2019 Apr 11. Epub 2019 Apr 11.

College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu, PR China. Electronic address:

Evidence has shown that neuromedin S (NMS) and its receptor (NMU2R) are expressed in the hypothalamus, pituitary, and testis of pigs. To determine the potential mechanisms of NMS, we systematically investigated the direct effects of NMS on the hypothalamic-pituitary-testicular (HPT) axis of male pigs in vitro. We initially confirmed that NMU2R distributed in isolated hypothalamic cells, anterior pituitary cells and Leydig cells using immunocytochemistry. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480183057
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http://dx.doi.org/10.1016/j.ygcen.2019.04.013DOI Listing
April 2019
4 Reads

Down-regulation of corticosteroid receptor in leucocytes of stressed rainbow trout.

Gen Comp Endocrinol 2019 Apr 10. Epub 2019 Apr 10.

Coastal and Freshwater Fisheries Research Center, National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, Nikko, Japan.

The relationship between stress and immunosuppression was investigated in peripheral blood leucocytes (PBL) in rainbow trout, with reference to corticosteroid receptor (CR) expression and responses to cortisol- and/or lipopolysaccharide (LPS)-administration. Confinement stress in shallow water resulted in a sustained elevation of plasma cortisol, whereas lysozyme and immunoglobin levels were suppressed. Significant increases in mRNA levels of caspase-6 and insulin-like growth factor (IGF)-I were observed in PBL isolated from stressed fish. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.011DOI Listing
April 2019
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The relationship between ingested thyroid hormones, thyroid homeostasis and iodine metabolism in humans and teleost fish.

Authors:
J Geoffrey Eales

Gen Comp Endocrinol 2019 Apr 11. Epub 2019 Apr 11.

Department of Biological Sciences, University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada. Electronic address:

Oral l-thyroxine (T4) therapy is used to treat human hypothyroidism but T4 fed to teleost fish does not raise plasma thyroid hormone (TH) levels nor induce growth, even though oral 3,5,3'-triiodo-l-thyronine (T3) is effective. This suggests a major difference in TH metabolism between teleosts and humans, often used as a starting thyroid model for lower vertebrates. To gain further insight on the proximate (mechanistic) and ultimate (survival value) factors underlying this difference, the several steps in TH homeostasis from intestinal TH uptake to hypothalamic-hypophyseal regulation were compared between humans and teleosts, and following dietary TH challenges. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.012DOI Listing
April 2019
2 Reads

Corticosterone negative feedback is weaker during spring vs. autumn migration in a songbird (Junco hyemalis).

Gen Comp Endocrinol 2019 Apr 8. Epub 2019 Apr 8.

Department of Biological Sciences, North Dakota State University, Fargo ND, USA.

Birds face many challenges during seasonal migrations and must make important decisions about whether to accelerate, maintain, or delay travel to their final destinations. Spring migration is likely more challenging than autumn migration as spring journeys are completed more quickly and weather conditions are harsher during this time. These differential challenges may be reflected in the endocrine stress response, as the hypothalamic-pituitary-adrenal (HPA) axis is important for both daily energetic needs and coping with stressors. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.008DOI Listing

Crude fiber modulates the fecal microbiome and steroid hormones in pregnant Meishan sows.

Gen Comp Endocrinol 2019 Apr 2. Epub 2019 Apr 2.

Shanghai Engineering Research Center of Breeding Pig, Shanghai Academy of Agricultural Sciences, Shanghai, PR China. Electronic address:

The beneficial effects of dietary fiber on the reproductive performance and welfare of sows have been discussed broadly, but few researches examined the causal changes and the association of gut microbiota and the steroid hormones, the main regulators of reproductive function. To shed light on this, thirty-six Meishan sows were allocated into 2.5% crude fiber (CF) group and 7. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.006DOI Listing
April 2019
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Evaluation of fecal hormones for noninvasive research on reproduction and stress in humpback whales (Megaptera novaeangliae).

Gen Comp Endocrinol 2019 Apr 2. Epub 2019 Apr 2.

Anderson Cabot Center for Ocean Life, New England Aquarium, Central Wharf, New England, Boston, MA 02110, USA.

Fecal hormone analysis shows high potential for noninvasive assessment of population-level patterns in stress and reproduction of marine mammals. However, the marine environment presents unique challenges for fecal sample collection. Data are still lacking on collection methodology and assay validations for most species, particularly for those mysticete whales that have variable diets. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.004DOI Listing

Chinese Special Issue - 1st International Symposium of Chinese Comparative Endocrinologists.

Authors:

Gen Comp Endocrinol 2019 Apr 3. Epub 2019 Apr 3.

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http://dx.doi.org/10.1016/j.ygcen.2019.04.005DOI Listing

Knockout of Gnrh2 in zebrafish (Danio rerio) reveals its roles in regulating feeding behavior and oocyte quality.

Gen Comp Endocrinol 2019 Apr 2. Epub 2019 Apr 2.

Department of Marine Biotechnology, Institute of Marine and Environmental Technology, University of Maryland Baltimore County, Baltimore, Maryland, USA. Electronic address:

Many studies on Gnrh1, and the teleost Gnrh3, have elucidated the roles of these peptides in reproductive regulation. However, the role of the midbrain population of Gnrh, Gnrh2, has long been a mystery, despite its ubiquitous conservation in all jawed vertebrates except rodents. Previous behavioral studies in sparrows, musk shrews, mice, zebrafish, and goldfish show that Gnrh2 administrations both increase spawning behaviors and decrease feeding behaviors, suggesting a role of this peptide in metabolism regulation along with the canonical role in regulating reproduction. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.002DOI Listing

Loss of Gsdf leads to a dysregulation of Igf2bp3-mediated oocyte development in medaka.

Gen Comp Endocrinol 2019 Apr 2. Epub 2019 Apr 2.

Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai 201306, China; Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China. Electronic address:

Gonadal soma-derived factor (Gsdf) is a unique TGF-β factor essential for both ovarian and testicular development in Hd-rR medaka (Oryzias latipes). However, the downstream genes regulated by Gsdf signaling remain unknown. Using a high-throughput proteomic approach, we identified a significant increase in the expression of the RNA-binding protein Igf2bp3 in gsdf-deficient ovaries. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.04.001DOI Listing
April 2019
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Adamts9 is necessary for ovarian development in zebrafish.

Gen Comp Endocrinol 2019 Apr 2. Epub 2019 Apr 2.

Department of Biology, East Carolina University, Greenville 27858, NC, USA. Electronic address:

Expression of adamts9 (A disintegrin and metalloprotease with thrombospondin type-1 motif, member 9) increases dramatically in the somatic cells surrounding oocytes during ovulation in vertebrates from zebrafish to human. However, the function of Adamts9 during ovulation has not been determined due to the embryonic lethality of knockouts in mice and Drosophila. To identify the role of Adamts9 during ovulation we generated knockout (adamts9) zebrafish using CRISPR/Cas9 and characterized the effects of the mutation. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480193004
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http://dx.doi.org/10.1016/j.ygcen.2019.04.003DOI Listing
April 2019
4 Reads

Daily expression of a clock gene in the brain and pituitary of the Malabar grouper (Epinephelus malabaricus).

Gen Comp Endocrinol 2019 Mar 28. Epub 2019 Mar 28.

Faculty of Science, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan. Electronic address:

Recent studies have revealed that, in addition to regulating the circadian system, clock genes such as cryptochrome (Cry) genes are involved in seasonal and lunar rhythmicity in fish. This study clarified the transcriptional characteristics of a Cry subtype (mgCry2) in the brain of the Malabar grouper, Epinephelus malabaricus, which is an important aquaculture species that spawns around the new moon. The cDNA sequence of mgCry2 showed high identity (97-99%) with fish Cry2 and had an open reading frame encoding a protein with 170 amino acids. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.019DOI Listing
March 2019
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Effects of sex hormones on liver tumor progression and regression in Myc/xmrk double oncogene transgenic zebrafish.

Gen Comp Endocrinol 2019 Mar 26. Epub 2019 Mar 26.

Department of Biological Sciences, National University of Singapore, Singapore. Electronic address:

Hepatocellular carcinoma (HCC) shows clear sex disparity with men being more prone to developing HCC and having higher mortality than women. Previous studies have indicated that sex hormones play important roles in HCC initiation and development, but the effects of sex hormones on HCC in clinical trials remain inconsistent. Using zebrafish liver tumor model co-induced by oncogenes Myc and xmrk, we observed similar sex disparity between male and female zebrafish in liver tumor progression and regression; i. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.018DOI Listing

Cloning and characterization of wnt4a gene in a natural triploid teleost, Qi river crucian carp (Carassius auratus).

Gen Comp Endocrinol 2019 Mar 25. Epub 2019 Mar 25.

Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Science, Southwest University, Chongqing 400715, PR China. Electronic address:

WNT4 (wingless-type MMTV integration site family, member 4) plays a key role in the ovarian differentiation and development in mammals. However, the possible roles of Wnt4 during gonadal differentiation and development need further clarification in teleosts. In this study, we cloned and characterized the full-length cDNA of Qi river crucian carp (Carassius auratus) wnt4a gene (CA-wnt4a). Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.016DOI Listing
March 2019
3 Reads

The gonadotropin-inhibitory hormone system of fish: The case of sea bass (Dicentrarchus labrax).

Gen Comp Endocrinol 2019 Mar 25. Epub 2019 Mar 25.

Department of Biology, Faculty of Marine and Environmental Sciences and INMAR, University of Cádiz, CEIMAR, Puerto Real (Cádiz), Spain. Electronic address:

Gonadotropin-inhibitory hormone (GnIH) is a hypothalamic neuropeptide belonging to the RFamide peptide family that was first discovered in quail by Tsutsui and co-workers in the year 2000. Since then, different GnIH orthologues have been identified in all vertebrate groups, from agnathans to mammals. These GnIH genes synthesize peptide precursors that encompass two to four C-terminal LPXRFamide peptides. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.015DOI Listing

An immunohistochemical analysis of peptidergic neurons apparently associated with reproduction and growth in Biomphalaria alexandrina.

Gen Comp Endocrinol 2019 Mar 26. Epub 2019 Mar 26.

Department of Physiology & Biophysics, Dalhousie University, Halifax, NS, Canada. Electronic address:

Peptide hormones and neurotransmitters involved in reproduction and growth have been studied extensively in certain gastropod molluscs, such as Lymnaea stagnalis and Aplysia californica. The present study employs antisera that have been used to study peptidergic neurons in those species to probe the central nervous system of another gastropod, Biomphalaria alexandrina, an intermediate host of the parasitic trematode that causes schistosomiasis in humans. Whole mount preparations of central ganglia were stained immunohistochemically, and several populations of neurons appeared to be homologous to those forming the neuroendocrine axis that has been previously described in L. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.017DOI Listing
March 2019
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Ghrelin and electrical stimulating the lateral hypothalamus area regulated the discharges of gastric distention neurons via the dorsal vagal complex in cisplatin-treated rats.

Gen Comp Endocrinol 2019 Mar 23. Epub 2019 Mar 23.

Department of Pharmacy, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong, China. Electronic address:

Objective: Cisplatin is an important antineoplastic drug and has side effects such as nausea, vomiting, and dyspepsia. The detailed mechanisms for its side effects are yet not well be illustrated. Our purpose was to investigate the discharges of gastric distention (GD) sensitive neurons regulated by ghrelin and electrical stimulation of the lateral hypothalamus area (LHA) via the dorsal vagal complex (DVC) in cisplatin-treated rats. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.014DOI Listing

Characterization of channel catfish (Ictalurus punctatus) melanocortin-3 receptor reveals a potential network in regulation of energy homeostasis.

Gen Comp Endocrinol 2019 Mar 21. Epub 2019 Mar 21.

Department of Anatomy, Physiology and Pharmacology, College of Veterinary Medicine, Auburn University, Auburn, AL 36849, United States. Electronic address:

The melanocortin-3 receptor (MC3R) is known to be involved in regulation of energy homeostasis, regulating feed efficiency and nutrient partitioning in mammals. Its physiological roles in non-mammalian vertebrates, especially economically important aquaculture species, are not well understood. Channel catfish (Ictalurus punctatus) is the main freshwater aquaculture species in North America. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480183067
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http://dx.doi.org/10.1016/j.ygcen.2019.03.011DOI Listing
March 2019
4 Reads

Testosterone trends within and across seasons in male humpback whales (Megaptera novaeangliae) from Hawaii and Alaska.

Gen Comp Endocrinol 2019 Mar 20. Epub 2019 Mar 20.

Hawai'i Marine Mammal Consortium, P.O. Box 6107 Kamuela, HI 96743, United States.

Understanding reproductive profiles and timing of reproductive events is essential in the management and conservation of humpback whales (Megaptera novaeangliae). Yet compared to other parameters and life history traits, such as abundance, migratory trends, reproductive rates, behavior and communication, relatively little is known about variations in reproductive physiology, especially in males. Here, an enzyme immunoassay (EIA) for testosterone was validated for use in biopsy samples from male humpback whales. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.013DOI Listing

Dmrt1 (doublesex and mab-3-related transcription factor 1) expression during gonadal development and spermatogenesis in the Japanese eel.

Gen Comp Endocrinol 2019 Mar 19. Epub 2019 Mar 19.

Department of Aquaculture, National Taiwan Ocean University, Keelung 202, Taiwan; Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 202, Taiwan. Electronic address:

Dmrt1, doublesex- and mab-3-related transcription factor-1, has been suggested to play critical roles in male gonadogenesis, testicular differentiation and development, including spermatogenesis, among different vertebrates. Vasa is a putative molecular marker of germ cells in vertebrates. In this study, we cloned the full-length dmrt1 cDNA from Japanese eel, and the protein comprised 290 amino acids and presented an extremely conserved Doublesex and Mab-3 (DM) domain. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.012DOI Listing

Molecular and metabolic adaption of glucose metabolism in the red and white muscle of the omnivorous GIFT tilapia Oreochromis niloticus to a glucose load.

Gen Comp Endocrinol 2019 Mar 19. Epub 2019 Mar 19.

Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, Southwest University, Chongqing, China; School of Life Sciences, Southwest University, Chongqing, China.

In this experiment, Genetically improved farmed Nile tilapia Oreochromis niloticus were intraperitoneally injected with 1 g glucose/kg of body weight or saline. Red and white muscle tissues were collected at 0, 1, 2, 4, 6 and 12 h after the glucose tolerance test (GTT) or saline injection, and the time course of changes in molecular and metabolic adaption of glucose metabolism of these two tissues were evaluated. The results showed that the expression of insulin-responsive glucose transporter 4 (glut4) was up-regulated at 4 h after the GTT in the red muscle, implying an increase of glucose uptake. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.010DOI Listing

Yolk immunoreactive corticosterone in hierarchical follicles of Japanese quail (Coturnix japonica) exposed to heat challenge.

Gen Comp Endocrinol 2019 Mar 18. Epub 2019 Mar 18.

Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, Japan; Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Gifu, Japan. Electronic address:

High temperature decreases the egg number, ovarian weight, and hierarchical follicle number. In the present study, we investigated the effect of high temperature on the quality of eggs of adult female quails. Laying quail were raised under a standard thermal condition of 25 °C until exposed to an elevated temperature of 34 °C (experimental) or maintained at 25 °C (control) from 12:00 to 16:00 for 10 consecutive days. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.009DOI Listing

Novel discoveries in acid-base regulation and osmoregulation: A review of selected hormonal actions in zebrafish and medaka.

Gen Comp Endocrinol 2019 Mar 13. Epub 2019 Mar 13.

Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan. Electronic address:

Maintenance of internal ionic and acid-base homeostasis is critical for survival in all biological systems. Similar to mammals, aquatic fishes have developed sophisticated homeostatic mechanisms to mitigate metabolic or environmental disruptions in ionic and acid-base status of systemic body fluids via hormone-controlled transport of ions or acid equivalents. The present review summarizes newly discovered actions of several hormones in zebrafish (Danio rerio) and medaka (Oryzias latipes) that have greatly contributed to our overall understanding of ionic/acid-base regulation. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.007DOI Listing
March 2019
2 Reads

The germline-specific expression of Foxl3a and its paralogous Foxl3b are associated with male gonadal differentiation in the Japanese eel, Anguilla japonica.

Gen Comp Endocrinol 2019 Mar 13. Epub 2019 Mar 13.

Department of Aquaculture, National Taiwan Ocean University, Keelung 202, Taiwan; Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 202, Taiwan. Electronic address:

Unlike its paralog Foxl2, which is well known for its role in ovarian development in vertebrates, the function of Foxl3 is still unclear. Foxl3 is an ancient duplicated copy of Foxl2. It is present as a single copy in ray-finned fish. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.008DOI Listing

A unique role of thyroid hormone receptor β in regulating notochord resorption during Xenopus metamorphosis.

Gen Comp Endocrinol 2019 Mar 6. Epub 2019 Mar 6.

Section on Molecular Morphogenesis, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Bethesda, MD, USA. Electronic address:

Tail resorption during anuran metamorphosis is perhaps the most dramatic tissue transformation that occurs during vertebrate development. Earlier studies in highly related anuran species Xenopus laevis and Xenopus tropicalis have shown that thyroid hormone (T3) receptor (TR) plays a necessary and sufficient role to mediate the causative effect of T3 on metamorphosis. Of the two known TR genes in vertebrates, TRα is highly expressed during both premetamorphosis and metamorphosis while TRβ expression is low in premetamorphic tadpoles but highly upregulated as a direct target gene of T3 during metamorphosis, suggesting potentially different functions during metamorphosis. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.006DOI Listing

Growth differentiation factor 9 promotes follicle-stimulating hormone-induced progesterone production in chicken follicular granulosa cells.

Gen Comp Endocrinol 2019 05 6;276:69-76. Epub 2019 Mar 6.

Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China. Electronic address:

The function of oocyte-derived growth differentiation factor 9 (GDF9) in ovarian follicles has thus far been poorly defined in avian species compared with the defined function in mammals. Our aim here is to investigate the effects of GDF9 on steroidogenesis and on chicken ovarian granulosa cell (GC) mitosis. Primary GCs from both prehierarchical (6-8 mm in diameter, phGCs) and preovulatory follicles (F1-F5, poGCs) were cultured in the presence or absence of the GDF9 protein. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.005DOI Listing
May 2019
2.470 Impact Factor

The expression of melatonin receptors MT1 and MT2 is regulated by E2 in sheep oviduct.

Gen Comp Endocrinol 2019 Mar 5. Epub 2019 Mar 5.

College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, Gansu, China.

Some of the functions of melatonin in mammals are exerted through its membrane receptors (MRs) and studies have shown that estradiol (E2) might play an important role in regulating the expression of these proteins in female reproductive organs. However, no reports have reported the expression of MRs in the sheep oviduct or whether they are regulated by E2. Thus, herein, we detected the localization of MT1 and MT2 in the sheep oviduct. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480193002
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http://dx.doi.org/10.1016/j.ygcen.2019.03.004DOI Listing
March 2019
5 Reads

Molecular characterization, expression analysis, and functional properties of multiple 5-hydroxytryptamine receptors in Pacific abalone (Haliotis discus hannai).

Gen Comp Endocrinol 2019 05 5;276:52-59. Epub 2019 Mar 5.

Department of Marine Molecular Biosciences, Gangneung-Wonju National University, 7 Jukheon-gil, Gangneung, Gangwon 25457, Republic of Korea. Electronic address:

Neurotransmitters such as serotonin (5-hydroxytryptamine; 5-HT) in the central nervous system regulate diverse physiological functions, including reproduction, feeding, learning, and memory, in diverse animal phyla. 5-HT and the 5-HT1 subtype receptor play important roles in sexual maturation and in the initiation of gamete release in mollusks. However, little is known about the involvement of other 5-HT receptor subfamilies in the reproduction process. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.001DOI Listing
May 2019
6 Reads

Non-invasive monitoring of physiological stress in an afrotropical arid-zone passerine bird, the southern pied babbler.

Gen Comp Endocrinol 2019 05 2;276:60-68. Epub 2019 Mar 2.

South African Research Chair in Conservation Physiology, National Zoological Garden, South African National Biodiversity Institute, Pretoria, South Africa; DST-NRF Centre of Excellence at the FitzPatrick Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South Africa. Electronic address:

Using faecal matter to monitor stress levels in animals non-invasively is a powerful technique for elucidating the effects of biotic and abiotic stressors on free-living animals. To validate the use of droppings for measuring stress in southern pied babblers (Turdoides bicolor) we performed an ACTH challenge on captive individuals and determined the effect of temporary separation from their social group on their faecal glucocorticoid metabolite (fGCM) concentration. Additionally, we compared fGCM concentrations of captive babblers to those of wild conspecifics and examined the effects of dominance rank on fGCM concentration. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.002DOI Listing

Revisiting the evolution of the somatostatin family: Already five genes in the gnathostome ancestor.

Gen Comp Endocrinol 2019 Mar 2. Epub 2019 Mar 2.

Physiologie moléculaire et adaptation UMR 7221 CNRS and Muséum National d'Histoire Naturelle, Paris, France.

The somatostatin (SST) family members are a group of neuropeptides that are best known for their role in the regulation of growth, development and metabolism. The occurrence of six paralogous SST genes named SST1, SST2, SST3, SST4, SST5 and SST6 has been reported in vertebrates. It has been proposed that SST1, SST2 and SST5 arose in 2R from a common ancestral gene. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.022DOI Listing

Site-specific roles of N-linked oligosaccharides in recombinant eel follicle-stimulating hormone for secretion and signal transduction.

Gen Comp Endocrinol 2019 05 2;276:37-44. Epub 2019 Mar 2.

Animal Biotechnology, Graduate School of Future Convergence Technology, Department of Animal Life Science, Institute of Genetic Engineering, Hankyong National University, Ansung 17579, Republic of Korea. Electronic address:

Eel follicle-stimulating hormone (eelFSH) is composed of a common α-subunit and a hormone specific β-subunit, both of which contain two N-linked carbohydrate residues. We characterized the biologically active single chains by fusing the α-subunit to the carboxyl terminal region of the eelFSH β-subunit. Expression vectors were constructed and the biological activity of the recombinant hormones (rec-hormones) was characterized using Chinese hamster ovary (CHO) K1 cells expressing the eelFSH receptor gene. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.03.003DOI Listing

Post-natal corticosterone exposure affects ornaments in adult male house sparrows (Passer domesticus).

Gen Comp Endocrinol 2019 05 1;276:45-51. Epub 2019 Mar 1.

Centre d'Etudes Biologiques de Chizé, CNRS-ULR, UMR 7372, 79360 Villiers en Bois, France.

In vertebrates, the ontogeny of several crucial organismal systems is known to occur early in life. Developmental conditions can ultimately have important consequences on adult fitness by affecting individual phenotype. These developmental effects are thought to be primarily mediated by endocrine systems, and especially by glucocorticoids. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.021DOI Listing

A conceptual framework for understanding sexual differentiation of the teleost brain.

Gen Comp Endocrinol 2019 Feb 27. Epub 2019 Feb 27.

Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan.

Vertebrate brains are sexually differentiated, giving rise to differences in various physiological and behavioral phenotypes between the sexes. In developing mammals and birds, the neural substrate underlying sex-dependent physiology and behavior undergoes an irreversible process of sexual differentiation due to the effects of perinatal gonadal steroids and sex chromosome complement. The differentiated neural substrate is then activated in the adult by the sex-specific steroid milieu to facilitate the expression of sex-typical phenotypes. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.020DOI Listing
February 2019

A mechanistic model for studying the initiation of anguillid vitellogenesis by comparing the European eel (Anguilla anguilla) and the shortfinned eel (A. australis).

Gen Comp Endocrinol 2019 Feb 20. Epub 2019 Feb 20.

Wageningen University & Research Animal Breeding and Genomics, Wageningen Livestock Research, PO Box 338, 6700 AH Wageningen, The Netherlands. Electronic address:

An inverse relation exists between the maturation stage at the start of the oceanic reproductive migration and the migration distance to the spawning grounds for the various eel species. The European eel Anguilla anguilla migrates up to 5-6000 km and leaves in a previtellogenic state. The shortfinned eel A. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.018DOI Listing
February 2019
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Interaction of starfish gonadotropin with its receptor: Effect of chimeric relaxin-like gonad-stimulating peptides.

Gen Comp Endocrinol 2019 05 20;276:30-36. Epub 2019 Feb 20.

Department of Applied Biochemistry, School of Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan.

A relaxin-like gonad-stimulating peptide (RGP) of starfish Patiria (Asterina) pectinifera is the first identified invertebrate gonadotropin for final gamete maturation. Recently, we found three orthologs of RGP in the class Asteroida; PpeRGP in P. pectinifera, AamRGP in Asterias amurensis, and AjaRGP in Aphelasterias japonica. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.019DOI Listing

Traffic noise exposure alters nestling physiology and telomere attrition through direct, but not maternal, effects in a free-living bird.

Gen Comp Endocrinol 2019 05 20;276:14-21. Epub 2019 Feb 20.

Department of Neurobiology, Physiology and Behavior, University of California Davis, One Shields Avenue, Davis, CA 95616, USA.

Anthropogenic impacts, such as noise pollution from transportation networks, can serve as stressors to some wildlife species. For example, increased exposure to traffic noise has been found to alter baseline and stress-induced corticosterone levels, reduce body condition and reproductive success, and increase telomere attrition in free-living birds. However, it remains unknown if alterations in nestling phenotype are due to direct or indirect effects of noise exposure. Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.017DOI Listing

Retraction notice to "Testosterone promotes anxiolytic-like behavior in gonadectomized male rats via blockade of the 5-HT1A receptors" [GCE Vol 254 (1 December 2017)14-21].

Gen Comp Endocrinol 2019 04;274:113

Department of Biology, Alexandru Ioan Cuza University of Iasi, Bd. Carol I, No. 11, 700506, Romania.

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http://dx.doi.org/10.1016/j.ygcen.2018.12.010DOI Listing

Identification, expression analysis, and functional characterization of motilin and its receptor in spotted sea bass (Lateolabrax maculatus).

Gen Comp Endocrinol 2019 Feb 13. Epub 2019 Feb 13.

Key Laboratory of Mariculture (Ocean University of China), Ministry of Education, Qingdao, 266003, PR China. Electronic address:

Motilin (MLN), an interdigestive hormone secreted by endocrine cells of the intestinal mucosa, binds to a G protein-coupled receptor to exert its biological function of regulating gastrointestinal motility. In the present study, we identified the prepromotilin and mln receptor (mlnr) from the spotted sea bass, Lateolabrax maculatus. Mln consisted of an ORF of 336 nucleotides encoding 111 amino acids. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00166480183047
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http://dx.doi.org/10.1016/j.ygcen.2019.02.013DOI Listing
February 2019
14 Reads

Thermal manipulation and GnRHa therapy applied to the reproduction of lambari-do-rabo-amarelo, Astyanax altiparanae females (Characiformes: Characidae) during the non-breeding season.

Gen Comp Endocrinol 2019 Feb 12. Epub 2019 Feb 12.

Instituto de Biociências - USP, São Paulo, SP, Brazil. Electronic address:

Lambari-do-rabo-amarelo Astyanax altiparanae in the wild reproduce during spring and summer, but females undergo vitellogenesis throughout the year, including the non-spawning winter period when water temperatures are low. The present study investigated the physiological role of temperature modulation on the hypothalamus-pituitary-gonads axis of lambari during winter, as well as the effects of gonadotropin releasing hormone agonist (GnRHa) therapy. Captive females were exposed to two different temperatures (20 °C and 27 °C) and were injected weekly with GnRHa for 21 days during winter (Control, CTR; Low dose; LD and high dose of GnRHa, HD). Read More

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http://dx.doi.org/10.1016/j.ygcen.2019.02.016DOI Listing
February 2019
1 Read