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General and Comparative Endocrinology

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https://www.readbyqxmd.com/read/29317213/influence-of-strain-origin-on-osmoregulatory-and-endocrine-parameters-of-two-non-native-strains-of-atlantic-salmon-salmo-salar-l
#1
Benoît Bernard, Kevin Chantung Sobandi, Veerle Darras, Xavier Rollin, Syaghalirwa N M Mandiki, Patrick Kestemont
Non-native strains of Atlantic salmon are used in reinstatement trials where populations are extinct. Environmental cues like photoperiod and temperature are known to influence the smolting process and there is evidence of strain-, stock- or population-specific differences associated with seaward migration or smoltification. The objective of this study was to compare morphological, osmoregulatory and endorcrine features between two strains, one originating from a cold and short river in Ireland (Cong) and another from a long and warm river in France (Loire-Allier), reared under Belgian conditions in order to highlight major differences in restocking adaptability...
January 6, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29317212/folliculogenic-factors-in-photoregressed-ovaries-differences-in-mrna-expression-in-early-compared-to-late-follicle-development
#2
Alexander K Salomon, Kathleen Leon, Melissa M Campbell, Kelly A Young
The early stages of ovarian folliculogenesis generally progress independent of gonadotropins, whereas later stages require signaling initiated by FSH. In Siberian hamsters, cycles of folliculogenesis are mediated by changes in photoperiod which depress the hypothalamic pituitary gonadal axis. Reduced gonadotropins lead to decreases in mature follicle development and ovulation; however, early stages of folliculogenesis have not been explored in regressed ovaries. We hypothesized that intraovarian factors that contribute predominantly to later stages of folliculogenesis would react to changes in photoperiod, whereas factors contributing to earlier stages would not change...
January 6, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29305879/reproductive-stage-and-sex-dependant-effects-of-neurohypophyseal-nonapeptides-on-gonadotropin-subunit-mrna-expression-in-the-catfish-heteropneustes-fossilis-an-in-vitro-study
#3
A Acharjee, R Chaube, K P Joy
In the present study, in vitroeffects of synthetic vasotocin (VT), isotocin (4Ser, 8Ile- oxytocin; ITb) and the recently cloned IT gene paralog product (8Val-Isotocin, ITa) were studied onthe expression of pituitary gonadotropin (GtH) subunit mRNA levels. In male pituitaries of early (preparatory phase) and late (prespawning phase) recrudescing catfish, Heteropneustes fossilis, VT (10 nM, 100 nM and 1000 nM) stimulated fshβ expression dose-dependently. But in females, the dose-dependent effect was found only in the preparatory phase...
January 3, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29288672/seasonal-changes-in-color-perception
#4
REVIEW
Tsuyoshi Shimmura, Tomoya Nakayama, Ai Shinomiya, Takashi Yoshimura
In temperate zones, organisms experience dynamic fluctuations in environment including changes in color. To cope with such seasonal changes in the environment, organisms adapt their physiology and behavior. Although color perception has been believed to be fixed throughout life, there is increasing evidence for the alteration in opsin gene expression induced by environmental stimuli in a number of animals. Very recently, dynamic seasonal plasticity in color perception has been reported in the seasonally breeding medaka fish...
December 27, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29278693/crustacean-cardioactive-peptides-expression-localization-structure-and-a-possible-involvement-in-regulation-of-egg-laying-in-the-cuttlefish-sepia-officinalis
#5
Maxime Endress, Céline Zatylny-Gaudin, Erwan Corre, Gildas Le Corguillé, Louis Benoist, Jérôme Leprince, Benjamin Lefranc, Benoît Bernay, Alexandre Leduc, Jimmy Rangama, Anne-Gaëlle Lafont, Arnaud Bondon, Joël Henry
The cuttlefish (Sepia officinalis) is a cephalopod mollusk distributed on the western European coast, in the West African Ocean and in the Mediterranean Sea. On the Normandy coast (France), cuttlefish is a target species of professional fishermen, so its reproduction strategy is of particular interest in the context of stock management. Egg-laying, which is coastal, is controlled by several types of regulators among which neuropeptides. The cuttlefish neuropeptidome was recently identified by Zatylny-Gaudin et al...
December 23, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29277418/maternal-undernutrition-during-early-pregnancy-inhibits-postnatal-growth-of-the-tibia-in-the-female-offspring-of-rats-by-alteration-of-chondrogenesis
#6
Tomoko Kimura, Kodai Hino, Tadaaki Kono, Atsushi Takano, Norihisa Nitta, Noritoshi Ushio, Shinjiro Hino, Ryuta Takase, Motoi Kudo, Yataro Daigo, Wataru Morita, Mitsuyoshi Nakao, Masato Nakatsukasa, Toshihiro Tamagawa, Ashiq Mahmood Rafiq, Akihiro Matsumoto, Hiroki Otani, Jun Udagawa
Epidemiological research has suggested that birth weights are correlated with adult leg lengths. However, the relationship between prenatal undernutrition (UN) and postnatal leg growth remains controversial. We investigated the effects of UN during early pregnancy on postnatal hindlimb growth and determined whether early embryonic malnutrition affects the functions of postnatal chondrocytes in rats. Undernourished Wistar dams were fed 40% of the daily intake of rats in the control groups from gestational days 5...
December 22, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29273352/evaluation-of-different-ranges-of-lh-fsh-ratios-in-polycystic-ovarian-syndrome-pcos-clinical-based-case-control-study
#7
N A Malini, K Roy George
BACKGROUND: Polycystic ovary syndrome (PCOS) is a highly prevalent endocrine and metabolic disorder among reproductive aged women, leading to infertility. One of the common clinical manifestations in PCOS is that there is a difference in the range of LH production in different case of PCOS and accordingly variability in LH: FSH ratio was observed. OBJECTIVE: The aim of the present study was to evaluate different ranges of LH: FSH ratios in PCOS. EXPERIMENTAL: design In this cross sectional study, a consecutive series of 745 women (aged 28...
December 19, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29247680/changes-in-steroid-profiles-of-the-blue-mussel-mytilus-trossulus-as-a-function-of-season-stage-of-gametogenesis-sex-tissue-and-mussel-bed-depth
#8
Katarzyna Smolarz, Sandra Zabrzańska, Lucyna Konieczna, Anna Hallmann
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 and E3 were found in mussels sampled in spring and summer while the lowest levels were found in winter. This pattern was stable and was seen in both sexes and tissues in mussels from both mussel beds...
December 13, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29247679/anti-leptin-receptor-antibodies-strengthen-leptin-biofunction-in-growing-chickens
#9
M M Lei, C K Wei, Z Chen, S Yosefi, H X Zhu, Z D Shi
Antibodies against the extracellular domains of the chicken leptin receptor were used to study the biological function of leptin in growing chickens. Both polyclonal and monoclonal antibodies were administered intramuscularly to 30-d-old Chinese indigenous Gushi pullets. Both antibody preparations increased feed intake for 6 h after injection and reduced plasma concentrations of glucose, triglycerides, and both high- and low-density lipoproteins. The antibody treatments also upregulated agouti-related peptide and neuropeptide Y in the hypothalamus and downregulated proopiomelanocortin, melanocortin 4 receptor, and leptin receptor...
December 13, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29217466/influence-of-corticosterone-treatment-on-nestling-begging-in-florida-scrub-jays-aphelocoma-coerulescens
#10
Emily K Elderbrock, Thomas W Small, Stephan J Schoech
Altricial young are dependent on adults for protection and food, and they display nutritional need by begging to elicit feeding from parents. Begging at high levels can be energetically expensive and attract predators; thus, an individual must balance its nutritional needs with these potential costs. Further, because a parent is limited in the amount of food it can provide, begging can contribute to both parent-offspring conflict and sibling-sibling competition. Many extrinsic and intrinsic factors may contribute to begging behavior...
December 4, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29208362/feminizing-effects-of-exposure-to-corexit-enhanced-water-accommodated-fraction-of-crude-oil-in-vitro-on-sex-determination-in-alligator-mississippiensis
#11
Cameron E Williams, Nicole A McNabb, Arnold Brunell, Russell H Lowers, Yoshinao Katsu, Demetri D Spyropoulos, Satomi Kohno
Deepwater Horizon spilled over 200 million gallons of oil into the waters of the Gulf of Mexico in 2010. In an effort to contain the spill, chemical dispersants were applied to minimize the amount of oil reaching coastal shorelines. However, the biological impacts of chemically-dispersed oil are not well characterized, and there is a particular lack of knowledge concerning sublethal long-term effects of exposure. This study examined potential estrogenic effects of CWAF, Corexit 9500-enhanced water-accommodated fraction of oil, by examining its effect on estrogen receptors and sex determination in the American alligator, Alligator mississippiensis...
December 2, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29203389/leopoldina-symposium-seasonal-rhythms
#12
EDITORIAL
Horst-Werner Korf
No abstract text is available yet for this article.
December 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29203388/the-occurrence-of-intersex-fishes-in-boulder-creek-colorado-is-a-recent-phenomenon
#13
David O Norris, Ashley L Bolden, Alan M Vajda
Gonads were examined visually and histologically from white sucker (Catostomus commersoni) and fathead minnows (Pimephales promelas) isolated from museum specimens collected from Boulder Creek, Colorado. These fishes were collected between 42 and 102 years ago before addition of large quantities of estrogenic chemicals via wastewater effluent was reported to disrupt reproductive structures and functions in white suckers living in Boulder Creek downstream of the wastewater treatment facility (WWTF) and in test exposures of fathead minnows to wastewater effluent at the WWTF...
December 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29199102/effect-of-repeated-adrenocorticotropic-hormone-administration-on-reproductive-function-and-hair-cortisol-concentration-during-the-estrous-cycle-in-goats
#14
Natsumi Endo, Hiroaki Yamane, Larasati Puji Rahayu, Tomomi Tanaka
Measurement of the cortisol concentration in hair has been used as an index of chronic stress in several species including humans, wildlife and domestic animals. However, how accurately the cortisol concentration in hair reflects the changes in circulating cortisol concentrations has not been well documented. The objective of the present study was to examine the effect of repeated adrenocorticotropic hormone (ACTH) administration on the reproductive function during the estrous cycle and hair cortisol concentrations in goats...
November 30, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29197555/temperature-vs-estrogen-induced-sex-determination-in-caiman-latirostris-embryos-both-females-but-with-different-expression-patterns-of-key-molecules-involved-in-ovarian-development
#15
Canesini Guillermina, Stoker Cora, H Galoppo Germán, L Durando Milena, V Tschopp María, H Luque Enrique, M Muñoz-de-Toro Mónica, G Ramos Jorge
Caiman latirostris is a species with temperature dependent sex determination (TSD), which implies that the incubation temperature of the eggs is the main factor that determines the sex during a thermo-sensitive period (TSP). However, estrogens play a critical role in this process. The administration of 17β-estradiol (E2) previous to TSP overrides the effects of male incubation temperature, producing phenotypic females. This effect has been defined as sex reversal or estrogen-induced sex determination (E2SD)...
November 29, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29197554/baseline-and-stress-induced-blood-properties-of-male-and-female-darwin-s-small-ground-finch-geospiza-fuliginosa-of-the-galapagos-islands
#16
Timothy D Clark, Sonia Kleindorfer, Rachael Y Dudaniec
Birds are renowned for exhibiting marked sex-specific differences in activity levels and reproductive investment during the breeding season, potentially impacting circulating blood parameters associated with stress and energetics. Males of many passerines often do not incubate, but they experience direct exposure to intruder threat and exhibit aggressive behaviour during the nesting phase in order to defend territories against competing males and predators. Nesting females often have long bouts of inactivity during incubation, but they must remain vigilant of the risks posed by predators and conspecific intruders approaching the nest...
November 29, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29197553/evidence-for-condition-mediated-trade-offs-between-the-hpa-and-hpg-axes-in-the-wild-zebra-finch
#17
Ondi L Crino, Sophia M Jensen, Katherine L Buchanan, Simon C Griffith
Opportunistic breeding is a strategy used to maximize reproductive success in unpredictable environments. Birds that breed opportunistically are thought to maintain partial activation of the reproductive axis in order to rapidly initiate breeding when environmental conditions become suitable. The physiological mechanisms that modulate reproduction in seasonally breeding birds have been well explored. In contrast, the physiological mechanisms that allow opportunistic breeding birds to maintain a continued state of reproductive readiness has not been well established...
November 29, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29183795/from-zebrafish-to-human-a-comparative-approach-to-elucidate-the-role-of-the-thyroid-hormone-transporter-mct8-during-brain-development
#18
REVIEW
Pieter Vancamp, Veerle M Darras
Monocarboxylate transporter 8 (MCT8) facilitates transmembrane transport of thyroid hormones (THs) ensuring their action on gene expression during vertebrate neurodevelopment. A loss of MCT8 in humans results in severe psychomotor deficits associated with the Allan-Herndon-Dudley Syndrome (AHDS). However, where and when exactly a lack of MCT8 causes the neurological manifestations remains unclear because of the varying expression pattern of MCT8 between specific brain regions and cells. Here, we elaborate on the animal models that have been generated to elucidate the mechanisms underlying MCT8-deficient brain development...
November 26, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29183794/characterization-of-carp-gonadotropins-structure-annual-profile-and-carp-and-zebrafish-pituitary-topographic-organization
#19
Lian Hollander-Cohen, Matan Golan, Joseph Aizen, Michal Shpilman, Berta Levavi-Sivan
Two gonadotropins, follicle stimulating hormone (FSH) and luteinizing hormone (LH), are important players in the hypothalamic-pituitary-gonadal axis of vertebrates. In the present work, we describe the construction of recombinant (r) common carp (Cyprinus carpio; c) FSH (rcFSH) and LH (rcLH) using the Pichia pastoris system, the generation of specific antibodies against their respective β subunits, and their use in the development and validation of specific ELISAs. We produced carp rLH and rFSH as single-chain polypeptides, wherein the GTH subunit α was joined with either cLHβ or cFSHβ mature protein-coding sequences to form a fusion gene that encodes a yoked polypeptide, in which the GTH β-subunit forms the N-terminal part and the α-subunit forms the C-terminal part...
November 26, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29180105/sex-hormone-binding-globulin-b-expression-in-the-rainbow-trout-ovary-prior-to-sex-differentiation
#20
Claudio Pérez, Cristian Araneda, Francisco Estay, Nelson F Díaz, Denise Vizziano-Cantonnet
Salmonids have two sex hormone-binding globulin (Shbg) paralogs. Shbga is mainly expressed in the liver, while Shbgb is secreted by the granulosa cells of the rainbow trout ovary. Coexpression of shbgb and the gonadal aromatase cyp19a1a mRNAs been observed in granulosa cells, suggesting a physiological coordination between Shbgb expression and estrogen synthesis. As estrogens are essential for female sex determination in the fish ovary, we propose that Shbgb participates in early ovarian differentiation, either by binding with estrogen or through another mechanism that remains to be discovered...
November 24, 2017: General and Comparative Endocrinology
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