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Journal articles on the topic 'Hormonas juveniles'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Herrera-Ulloa, Angel, Jonathan Chacón-Guzmán, Gerando Zúñiga-Calero, Oscar Fajardo, and Ricardo Jiménez-Montealegre. "ACUICULTURA DE PARGO LA MANCHA LUTJANUS GUTTATUS (STEINDACHNER, 1869) EN COSTA RICA DENTRO DE UN ENFOQUE ECOSISTÉMICO." Revista Ciencias Marinas y Costeras 1 (December 21, 2009): 197. http://dx.doi.org/10.15359/revmar.1.11.

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La sobreexplotación pesquera y la búsqueda de alternativas ante la pobreza crónica han llevado a explorar el campo de la maricultura por medio de un enfoque ecosistémico se abrieron dos procesos paralelos: una estrategia e; investigación en laboratorio para el levantamiento larval de peces marinos tropicales y una estrategia de comanejo para desarrollar el cultivo de peces marinos tropicales. El pargo la mancha muestra gran potencial de producción de larvas y posterior cultivo en el mar. No mostró respuestas positivas a la inducción por medio de hormonas, el desarrollo de un ambiente adecuado

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2

Boogert, Neeltje J., Robert F. Lachlan, Karen A. Spencer, Christopher N. Templeton, and Damien R. Farine. "Stress hormones, social associations and song learning in zebra finches." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1756 (2018): 20170290. http://dx.doi.org/10.1098/rstb.2017.0290.

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The use of information provided by others is a common short-cut adopted to inform decision-making. However, instead of indiscriminately copying others, animals are often selective in what, when and whom they copy. How do they decide which ‘social learning strategy’ to use? Previous research indicates that stress hormone exposure in early life may be important: while juvenile zebra finches copied their parents' behaviour when solving novel foraging tasks, those exposed to elevated levels of corticosterone (CORT) during development copied only unrelated adults. Here, we tested whether this switc

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3

Meeran, Dawud, Henryk F. Urbanski, Susan J. Gregory, Julie Townsend, and Domingo J. Tortonese. "Developmental Changes in the Hormonal Identity of Gonadotroph Cells in the Rhesus Monkey Pituitary Gland." Journal of Clinical Endocrinology & Metabolism 88, no. 6 (2003): 2934–42. http://dx.doi.org/10.1210/jc.2002-021001.

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To help elucidate the regulatory mechanism responsible for divergent gonadotrophin secretion during sexual maturation, we examined the gonadotroph population and hormonal identity of gonadotroph subtypes in pituitary glands of juvenile (age, 1.7 ± 0.2 yr) and adult (age, 12.3 ± 0.8 yr) male rhesus monkeys (Macacca mulatta). Serum LH and testosterone concentrations were, respectively, 3 and 7 times lower in juveniles than in adults, thus confirming the different stages of development. Immunohistochemistry revealed that the proportion of LH gonadotrophs in relation to the total pituitary cell po

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4

Nunes, Scott, Eva-Maria Muecke, and Kay E. Holekamp. "Seasonal effects of food provisioning on body fat, insulin, and corticosterone in free-living juvenile Belding's ground squirrels (Spermophilus beldingi)." Canadian Journal of Zoology 80, no. 2 (2002): 366–71. http://dx.doi.org/10.1139/z01-222.

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We evaluated the relationship between body fat and the metabolic hormones insulin and corticosterone in free-living juvenile Belding's ground squirrels (Spermophilus beldingi). Some free-living juveniles were provisioned with extra food high in fat and calories, and unprovisioned juveniles were used as controls. Body fat (as a percentage of body mass) of squirrels was regularly evaluated using non-invasive methods. Blood samples were also regularly collected from juveniles and assayed for plasma concentrations of insulin and corticosterone. Provisioned juveniles were fatter than unprovisioned

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5

PETER, F. "Juvenile thyrotoxicosis." Acta Endocrinologica 113, no. 4_Suppl (1986): S361—S366. http://dx.doi.org/10.1530/acta.0.112s361.

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ABSTRACT The incidence of juvenile thyrotoxicosis has not exceeded one case per 100,000 population per year in Hungary during the past decades. From more than 200 simultaneous determinations of serum thyroid hormones (T3, T4, FT4) it was concluded that increased FT4 concentrations are the most frequent findings in thyrotoxicosis, even when both or one of the other thyroid hormone concentrations (T3, T4) are normal,-TSH and prolactin responses to TRH were studied in 18 patients; TSH remained always undetectable whereas prolactin increased in half of the patients. A significant negative relation

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6

Chatrath, Ritu, Karen L. Ronningen, Peter LaBreche, et al. "Effect of puberty on coronary arteries from female pigs." Journal of Applied Physiology 95, no. 4 (2003): 1672–80. http://dx.doi.org/10.1152/japplphysiol.00099.2003.

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Vascular function changes following loss of ovarian hormones in women at menopause and in experimental animals following surgical ovariectomy. Little is known about changes in vascular function during hormonal transition from sexual immaturity (juvenile) to sexual maturity. Therefore, experiments were designed to determine effects of natural puberty on vascular function in female pigs. Tissue was studied from eight juvenile (2-3 mo) and eight adult (5-6 mo) female pigs. Plasma nitric oxide (NO) was measured, and mRNA for endothelium-derived NO synthase (eNOS) and eNOS protein were determined i

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7

Tibbetts, Elizabeth A., Katherine Crocker, and Zachary Y. Huang. "Socially selected ornaments influence hormone titers of signalers and receivers." Proceedings of the National Academy of Sciences 113, no. 30 (2016): 8478–83. http://dx.doi.org/10.1073/pnas.1602707113.

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Decades of behavioral endocrinology research have shown that hormones and behavior have a bidirectional relationship; hormones both influence and respond to social behavior. In contrast, hormones are often thought to have a unidirectional relationship with ornaments. Hormones influence ornament development, but little empirical work has tested how ornaments influence hormones throughout life. Here, we experimentally alter a visual signal of fighting ability in Polistes dominulus paper wasps and measure the behavioral and hormonal consequences of signal alteration in signalers and receivers. We

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8

Oi, Cintia Akemi, Helena Mendes Ferreira, Rafael Carvalho da Silva, Andreas Bienstman, Fabio Santos do Nascimento, and Tom Wenseleers. "Effects of juvenile hormone in fertility and fertility-signaling in workers of the common wasp Vespula vulgaris." PLOS ONE 16, no. 5 (2021): e0250720. http://dx.doi.org/10.1371/journal.pone.0250720.

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In the highly eusocial wasp, Vespula vulgaris, queens produce honest signals to alert their subordinate workers of their fertility status, and therefore they are reproductively suppressed and help in the colony. The honesty of the queen signals is likely maintained due to hormonal regulation, which affects fertility and fertility cue expression. Here, we tested if hormonal pleiotropy could support the hypothesis that juvenile hormone controls fertility and fertility signaling in workers. In addition, we aimed to check oocyte size as a proxy of fertility. To do that, we treated V. vulgaris work

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9

Siregar, Khoirotun Nisa, Fajar Maulana, Muhammad Zairin Jr., Alimuddin Alimuddin та Widanarni Widanarni. "Controlling the cannibalism of African catfish juvenile by 17β‒estradiol hormone administration and the stocking density determination". Jurnal Akuakultur Indonesia 20, № 1 (2021): 72–81. http://dx.doi.org/10.19027/jai.20.1.72-81.

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An effort to increase the production of juvenile catfish is limited by the high mortality rate, especially caused by cannibalism. The hormonal treatment has been conducted as an effort to control cannibalism. This study used completely randomized factorial design, consisted of six treatments and three replications. There were two factors examined in this study, the first factor was different doses of 17β‒estradiol hormone (0, 30, and 60 mg estradiol‒17β/kg) incorporated in the feed, and the second factor was stocking density (150 and 300 fish/m2). Juvenile catfish with the size of 4.0 ± 0.1 cm

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10

Jindra, Marek. "Where did the pupa come from? The timing of juvenile hormone signalling supports homology between stages of hemimetabolous and holometabolous insects." Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1783 (2019): 20190064. http://dx.doi.org/10.1098/rstb.2019.0064.

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Insect metamorphosis boasts spectacular cases of postembryonic development when juveniles undergo massive morphogenesis before attaining the adult form and function; in moths or flies the larvae do not even remotely resemble their adult parents. A selective advantage of complete metamorphosis (holometaboly) is that within one species the two forms with different lifestyles can exploit diverse habitats. It was the environmental adaptation and specialization of larvae, primarily the delay and internalization of wing development, that eventually required an intermediate stage that we call a pupa.

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11

Segers, F. H. I. D., G. Berishvili, and B. Taborsky. "Egg size-dependent expression of growth hormone receptor accompanies compensatory growth in fish." Proceedings of the Royal Society B: Biological Sciences 279, no. 1728 (2011): 592–600. http://dx.doi.org/10.1098/rspb.2011.1104.

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Large egg size usually boosts offspring survival, but mothers have to trade off egg size against egg number. Therefore, females often produce smaller eggs when environmental conditions for offspring are favourable, which is subsequently compensated for by accelerated juvenile growth. How this rapid growth is modulated on a molecular level is still unclear. As the somatotropic axis is a key regulator of early growth in vertebrates, we investigated the effect of egg size on three key genes belonging to this axis, at different ontogenetic stages in a mouthbrooding cichlid ( Simochromis pleurospil

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12

Oostra, Vicencio, Maaike A. de Jong, Brandon M. Invergo, et al. "Translating environmental gradients into discontinuous reaction norms via hormone signalling in a polyphenic butterfly." Proceedings of the Royal Society B: Biological Sciences 278, no. 1706 (2010): 789–97. http://dx.doi.org/10.1098/rspb.2010.1560.

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Polyphenisms—the expression of discrete phenotypic morphs in response to environmental variation—are examples of phenotypic plasticity that may potentially be adaptive in the face of predictable environmental heterogeneity. In the butterfly Bicyclus anynana , we examine the hormonal regulation of phenotypic plasticity that involves divergent developmental trajectories into distinct adult morphs for a suite of traits as an adaptation to contrasting seasonal environments. This polyphenism is induced by temperature during development and mediated by ecdysteroid hormones. We reared larvae at separ

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13

Qu, Zhe, William G. Bendena, Wenyan Nong, et al. "MicroRNAs regulate the sesquiterpenoid hormonal pathway in Drosophila and other arthropods." Proceedings of the Royal Society B: Biological Sciences 284, no. 1869 (2017): 20171827. http://dx.doi.org/10.1098/rspb.2017.1827.

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Arthropods comprise the majority of all described animal species, and understanding their evolution is a central question in biology. Their developmental processes are under the precise control of distinct hormonal regulators, including the sesquiterpenoids juvenile hormone (JH) and methyl farnesoate. The control of the synthesis and mode of action of these hormones played important roles in the evolution of arthropods and their adaptation to diverse habitats. However, the precise roles of non-coding RNAs, such as microRNAs (miRNAs), controlling arthropod hormonal pathways are unknown. Here, w

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Fontaine, Romain, Eirill Ager-Wick, Kjetil Hodne, and Finn-Arne Weltzien. "Plasticity in medaka gonadotropes via cell proliferation and phenotypic conversion." Journal of Endocrinology 245, no. 1 (2020): 21–37. http://dx.doi.org/10.1530/joe-19-0405.

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Follicle-stimulating hormone (Fsh) and luteinizing hormone (Lh) produced by the gonadotropes play a major role in control of reproduction. Contrary to mammals and birds, Lh and Fsh are mostly produced by two separate cell types in teleost. Here, we investigated gonadotrope plasticity, using transgenic lines of medaka (Oryzias latipes) where DsRed2 and hrGfpII are under the control of the fshb and lhb promotors respectively. We found that Fsh cells appear in the pituitary at 8 dpf, while Lh cells were previously shown to appear at 14 dpf. Similar to Lh cells, Fsh cells show hyperplasia from juv

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15

Rejzek, Martin, Marie Zarevúcka, Zdeněk Wimmer, et al. "Synthesis of Juvenile Hormone Bioanalogs Derived from 2-(4-Hydroxybenzyl)-6-methylcyclohexanone." Collection of Czechoslovak Chemical Communications 61, no. 4 (1996): 605–14. http://dx.doi.org/10.1135/cccc19960605.

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A new simple approach to isomeric 2-(4-alkoxybenzyl)-6-methylcyclohexanones and the corresponding alcohols and a subsequent synthesis of compounds imitating the action of the insect juvenile hormones is described. Biological activity of the isomeric juvenile hormone bioanalogs differed considerably when tested on the flesh fly (Sarcophaga bullata) and the yellow mealworm (Tenebrio molitor).

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16

Liu, Suning, Kang Li, Yue Gao, et al. "Antagonistic actions of juvenile hormone and 20-hydroxyecdysone within the ring gland determine developmental transitions in Drosophila." Proceedings of the National Academy of Sciences 115, no. 1 (2017): 139–44. http://dx.doi.org/10.1073/pnas.1716897115.

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In both vertebrates and insects, developmental transition from the juvenile stage to adulthood is regulated by steroid hormones. In insects, the steroid hormone, 20-hydroxyecdysone (20E), elicits metamorphosis, thus promoting this transition, while the sesquiterpenoid juvenile hormone (JH) antagonizes 20E signaling to prevent precocious metamorphosis during the larval stages. However, not much is known about the mechanisms involved in cross-talk between these two hormones. In this study, we discovered that in the ring gland (RG) of Drosophila larvae, JH and 20E control each other’s biosynthesi

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17

Kolbe, Thomas, Sarjoun Sheety, Ingrid Walter, Rupert Palme, and Thomas Rülicke. "Impact of superovulation and mating on the wellbeing of juvenile and adult C57BL/6N mice." Reproduction, Fertility and Development 28, no. 7 (2016): 969. http://dx.doi.org/10.1071/rd14372.

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Superovulation of mice is routinely used to increase the number of obtainable ova per female. Because of the better outcome, prepubescent females are preferentially used. Here, we provide results of the impact of superovulation and mating on the wellbeing of juvenile compared with adult C57BL/6N mice. Two groups of mice (3–4 weeks vs 7–8 weeks old) were superovulated and mated. Observation of mating behaviour showed that reluctant adult females tended to fight the male’s approach, whereas juveniles preferred to take flight. Faeces were collected daily for the analysis of stress hormones. There

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18

Kotaki, Toyomi, Tetsuro Shinada, and Hideharu Numata. "Structure Determination of a Natural Juvenile Hormone Isolated from a Heteropteran Insect." Psyche: A Journal of Entomology 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/924256.

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Juvenile hormone (JH), which occurs in several forms in different insects, is one of the most important insect hormones. The structure of JH in Heteroptera has not been elucidated until recently, although insects in this suborder have long been used as experimental animals for JH research. Here we review the structure determination of a novel JH in a stink bug,Plautia stali, which was named juvenile hormone III skipped bisepoxide [JHSB3: methyl (2R,3S,10R)-2,3;10,11-bisepoxyfarnesoate], based on the arrangement of two epoxides at C2,3 and C10,11 with a skipped double bond at C6,7.

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19

Hare, Alexander J., Ahmed Waheed, James F. Hare, and W. Gary Anderson. "Cortisol and catecholamine responses to social context and a chemical alarm signal in juvenile lake sturgeon, Acipenser fulvescens." Canadian Journal of Zoology 93, no. 8 (2015): 605–13. http://dx.doi.org/10.1139/cjz-2015-0045.

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We examined potential benefits of group living in juvenile lake sturgeon (Acipenser fulvescens Rafinesque, 1817) and whether those benefits applied equally to associations with conspecific and allospecific individuals. In the first experiment, one focal lake sturgeon was placed with either seven size-matched conspecifics, allospecifics, or in isolation and given a 30 s air exposure. In the second experiment, one focal lake sturgeon was placed with either seven conspecifics or in isolation and was exposed to a conspecific skin homogenate as a potential alarm substance or a control of distilled

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Woda, Craig B., Nabil Halaihel, Paul V. Wilson, Aviad Haramati, Moshe Levi, and Susan E. Mulroney. "Regulation of renal NaPi-2 expression and tubular phosphate reabsorption by growth hormone in the juvenile rat." American Journal of Physiology-Renal Physiology 287, no. 1 (2004): F117—F123. http://dx.doi.org/10.1152/ajprenal.00357.2002.

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Growth hormone (GH) is an important factor in the developmental adaptation to enhance Pi reabsorption; however, the nephron sites and mechanisms by which GH regulates renal Pi uptake remain unclear and are the focus of the present study. Micropuncture experiments were performed after acute thyroparathyroidectomy in the presence and absence of parathyroid hormone (PTH) in adult (14- to 17-wk old), juvenile (4-wk old), and GH-suppressed juvenile male rats. While the phosphaturic effect of PTH was blunted in the juvenile rat compared with the adult, suppression of GH in the juvenile restored frac

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Maddalozzo, John, Louis T. Tenta, Lewis R. Hutchinson, Susan E. Crawford, and Daniel S. Morse. "Juvenile fibromatosis: hormonal receptors." International Journal of Pediatric Otorhinolaryngology 25, no. 1-3 (1993): 191–99. http://dx.doi.org/10.1016/0165-5876(93)90053-6.

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22

Teulier, Loic, Cyril Dégletagne, Benjamin Rey, et al. "Selective upregulation of lipid metabolism in skeletal muscle of foraging juvenile king penguins: an integrative study." Proceedings of the Royal Society B: Biological Sciences 279, no. 1737 (2012): 2464–72. http://dx.doi.org/10.1098/rspb.2011.2664.

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The passage from shore to marine life of juvenile penguins represents a major energetic challenge to fuel intense and prolonged demands for thermoregulation and locomotion. Some functional changes developed at this crucial step were investigated by comparing pre-fledging king penguins with sea-acclimatized (SA) juveniles ( Aptenodytes patagonicus ). Transcriptomic analysis of pectoralis muscle biopsies revealed that most genes encoding proteins involved in lipid transport or catabolism were upregulated, while genes involved in carbohydrate metabolism were mostly downregulated in SA birds. Dete

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Darrouzet, Eric, Bernard Mauchamp, Glenn D. Prestwich, Lucien Kerhoas, István Ujváry, and Franck Couillaud. "Hydroxy Juvenile Hormones: New Putative Juvenile Hormones Biosynthesized by Locust Corpora Allatain Vitro." Biochemical and Biophysical Research Communications 240, no. 3 (1997): 752–58. http://dx.doi.org/10.1006/bbrc.1997.7739.

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Muratova, S. T. "Diagnosed changes of bone mineral density and level of calciotropic hormones in children with juvenile hyperthyroidism." Modern pediatrics. Ukraine, no. 3(115) (April 27, 2021): 23–30. http://dx.doi.org/10.15574/sp.2021.115.23.

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The development of the skeletal system occur during childhood. Thyroid hormones play an important role in the skeleton's maturation and maintenance of the structure and mass of bones. Juvenile hyperthyroidism affects bone metabolism. This study aimed to identify abnormalities in bone mineral density and the level of calciotropic hormones in juvenile hyperthyroidism to further improve the diagnosis of complications of juvenile hyperthyroidism. Materials and methods. The study was conducted by 21 health controls and 71 children and adolescents with juvenile hyperthyroidism. Anthropometric indica

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Gade, G., K. H. Hoffmann, and J. H. Spring. "Hormonal regulation in insects: facts, gaps, and future directions." Physiological Reviews 77, no. 4 (1997): 963–1032. http://dx.doi.org/10.1152/physrev.1997.77.4.963.

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There are two main classes of hormones in insects: 1) the true hormones produced by epithelial glands and belonging to the ecdysteroids or juvenile hormones and 2) the neuropeptide hormones produced by neurosecretory cells. Members of these classes regulate physiological, developmental, and behavioral events in insects. Detailed accounts are given on isolation, identification, structure-activity relationships, mode of action, biological function, biosynthesis, inactivation, metabolism, and feedback for hormones involved in 1) metabolic regulation such as the adipokinetic/hypertrehalosemic pept

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Ferenz, Hans-Jörg, and Elke Aden. "Kontrolle der Juvenilhormon-Biosynthese durch das Ovar bei Locusta migratoria (Orthoptera): Acrididae)." Entomologia Generalis 18, no. 1-2 (1993): 9–17. http://dx.doi.org/10.1127/entom.gen/18/1993/9.

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Yang, Huipeng, and Jie Wu. "Comparison of Predicted Amino Acid Sequences of Allatotropin/Allatostatin Receptors from Solitary to Eusocial Bee Species (Hymenoptera, Apoidea)." Journal of Apicultural Science 63, no. 2 (2019): 267–79. http://dx.doi.org/10.2478/jas-2019-0021.

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AbstractAn increasingly amount of evidence supports that the evolution of eusociality is accompanies by shifts in ancient molecular and physiological pathways. The juvenile hormone, one of the most important hormones in the post-embryonic development of insects, attracts the most attention in the context of social organization. Allatoregulatory neuropeptides (Allatotropin, Allatostatin-A and Allatostatin-C) are known to regulate juvenile hormone synthesis and release in insects. In order to clarify the transitions of juvenile hormone synthesis involved in eusocial evolution, the substitutions

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Lewis, S. E., A. Yokofich, M. Mohr, C. Kurth, R. Giuliani, and M. G. Baldridge. "Exposure to bisphenol A modulates hormone concentrations in Gammarus pseudolimnaeus." Canadian Journal of Zoology 90, no. 12 (2012): 1414–21. http://dx.doi.org/10.1139/cjz-2012-0178.

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Bisphenol A (BPA) is an endocrine-disrupting compound that can enter aquatic systems through landfill leachate or wastewater effluent. Although impacts of BPA on vertebrates are well documented, its effects on invertebrates are less clear. Amphipods such as Gammarus pseudolimnaeus Bousfield, 1958 are often prevalent invertebrates in freshwater ecosystems and can provide a powerful invertebrate model system to investigate the endocrine-disruptive capabilities of BPA. However, techniques to assay hormone concentrations in amphipods, especially vertebrate-like steroid sex hormones, are not widesp

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Calcaterra, Valeria, Ghassan Nakib, Gloria Pelizzo, et al. "Central precocious puberty and granulosa cell ovarian tumor in an 8-year old female." Pediatric Reports 5, no. 3 (2013): 13. http://dx.doi.org/10.4081/pr.2013.e13.

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Ovarian tumors associated with hormonal changes of the peripheral iso-sexual precocious puberty are of common presentation. We describe here a rare case of juvenile granulosa cell tumor in a female with central precocious puberty (CPP). An 8-year old girl with CPP presented with vaginal bleeding four months after the diagnosis and before starting treatment with gonadotropin-releasing hormone (GnRH)-analogs. Suppression of basal follicle-stimulating hormone (FSH) level, elevation of serum estradiol, progesterone and Cancer Antigen-125 were documented. Abdominal ultrasound examination (US) and m

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Weeks, J. C., and J. W. Truman. "Hormonally mediated reprogramming of muscles and motoneurones during the larval-pupal transformation of the tobacco hornworm, Manduca sexta." Journal of Experimental Biology 125, no. 1 (1986): 1–13. http://dx.doi.org/10.1242/jeb.125.1.1.

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The larval-pupal transformation of Manduca sexta results from an exposure to ecdysteroids in the absence of juvenile hormone (the commitment pulse), followed by a larger exposure to ecdysteroids (the prepupal peak) with a reappearance of juvenile hormone (JH). The prepupal ecdysteroid peak triggers the degeneration of abdominal muscles, and the dendritic regression and death of identified motoneurones. The present experiments examined the role of the commitment pulse in the larval-pupal reprogramming of these cells. The commitment pulse did not overtly affect the muscles and motoneurones, but

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Sláma, Karel. "Insect hormones: more than 50-years after the discovery of insect juvenile hormone analogues (JHA, juvenoids)." Terrestrial Arthropod Reviews 6, no. 4 (2013): 257–333. http://dx.doi.org/10.1163/18749836-06041073.

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This review describes the over half-centennial history of research on insect juvenile hormone (JH) as well as its natural and synthetic bioanalogues (JHA or juvenoids).The leading theories of insect hormone action in growth and metamorphosis were created more than 50 years ago by the pioneers of insect endocrinology, V. B. Wigglesworth, C. M. Williams, V. J. A. Novák, H. Piepho, H. A. Schneiderman and L. I. Gilbert. There are two principal categories of hormones released from the central neuroendocrine system (neurosecretory cells of the brain, corpora cardiaca, corpora allata) that regulate i

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Gardiner, K. J., I. L. Boyd, B. K. Follett, P. A. Racey, and P. JH Reijnders. "Changes in pituitary, ovarian, and testicular activity in harbour seals (Phoca vitulina) in relation to season and sexual maturity." Canadian Journal of Zoology 77, no. 2 (1999): 211–21. http://dx.doi.org/10.1139/z98-211.

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This study examined pituitary sensitivity to exogenous gonadotrophin-releasing hormone (GnRH) in relation to time of year and changes in plasma progesterone, testosterone, luteinising hormone (LH), and follicle-stimulating hormone (FSH) concentrations during the annual cycle of adult and juvenile harbour seals (Phoca vitulina vitulina). There was no significant difference in seasonal changes in reproductive hormone levels between six captive individuals and seals caught from the wild (n = 80). Based on results from both the captive and the wild individuals, the plasma progesterone concentratio

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Varnavsky, Vladimir S., Tatsuya Sakamoto, and Tetsuya Hirano. "Stunting of Wild Coho Salmon (Oncorhynchus kisutch) in Seawater: Patterns of Plasma Thyroid Hormones, Cortisol, and Growth Hormone." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 3 (1992): 458–61. http://dx.doi.org/10.1139/f92-054.

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Under natural conditions, some coho salmon presmolts (Oncorhynchus kisutch) in Kamchatka have been observed to migrate prematurely to the sea and fail to grow in brackish water for prolonged periods (natural stunts). Plasma levels of growth hormone, cortisol, thyroxine, and triiodothyronine were measured in coho salmon parr captured in the river (freshwater), smolts migrating downstream captured at the river mouth (brackish water), smolts in the sea (seawater), and natural stunts in the inlet (brackish water). The physiological conditions of natural stunts seem analogous to those of hatchery-d

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REES, H. H. "Hormonal control of tick development and reproduction." Parasitology 129, S1 (2004): S127—S143. http://dx.doi.org/10.1017/s003118200400530x.

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Ecdysteroids (moulting hormones), juvenoids and neuropeptides in ticks are reviewed but, by far, the emphasis is on the former since this class of hormones has been the subject of most investigations. In immature stages of ticks, ecdysteroids have been shown to regulate moulting and to terminate larval diapause. Although there is a paucity of information on the molecular action of ecdysteroids in ticks, their action appears to be via a heterodimeric ecdysone/ultraspiracle receptor, as in insects. The role of ecdysteroids in sperm maturation in adult males is considered. In females, ecdysteroid

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Bownes, M., A. Scott, and A. Shirras. "Dietary components modulate yolk protein gene transcription in Drosophila melanogaster." Development 103, no. 1 (1988): 119–28. http://dx.doi.org/10.1242/dev.103.1.119.

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The three yolk proteins of Drosophila melanogaster begin to be synthesized at eclosion. Transcription of the genes is regulated by the genes tra, tra-2 and dsx and also by the insect hormones, juvenile hormone and 20-hydroxyecdysone. We show that there is yet another level of control which is dependent upon feeding. Females that are starved from eclosion show a basal level of yolk protein gene transcription, which is rapidly increased when a complete diet is supplied. We show that the effect is not due to incorrect development of the fat body and is unlikely to be solely due to a general effec

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Wimmer, Zdeněk, and Miroslav Romaňuk. "Insect juvenile hormones and their bioanalogues." Collection of Czechoslovak Chemical Communications 54, no. 9 (1989): 2302–29. http://dx.doi.org/10.1135/cccc19892302.

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This survey supplements and up-dates review articles of other authors published in the field of substances affecting the development of the insect, juvenoids. Attention has been paid primarily to such structures as deserved more detailed investigation in the given field owing to their biological properties, further to less known structures and facts, and lastly to the most recent information from literature, mainly paying attention to the present trend in searching for structural types of substances affecting insect development. The synthetic juvenoids discussed are divided into chapters, on t

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FARAG, M. MOKHTAR, S. E. GHANIMAH, A. RAGAIE, and T. H. SALEEM. "HORMONAL RECEPTORS IN JUVENILE NASOPHARYNGEAL ANGIOFIBROMA." Laryngoscope 97, no. 2 (1987): 208???211. http://dx.doi.org/10.1288/00005537-198702000-00013.

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Salis, Pauline, Natacha Roux, Delai Huang, et al. "Thyroid hormones regulate the formation and environmental plasticity of white bars in clownfishes." Proceedings of the National Academy of Sciences 118, no. 23 (2021): e2101634118. http://dx.doi.org/10.1073/pnas.2101634118.

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Determining how plasticity of developmental traits responds to environmental conditions is a challenge that must combine evolutionary sciences, ecology, and developmental biology. During metamorphosis, fish alter their morphology and color pattern according to environmental cues. We observed that juvenile clownfish (Amphiprion percula) modulate the developmental timing of their adult white bar formation during metamorphosis depending on the sea anemone species in which they are recruited. We observed an earlier formation of white bars when clownfish developed with Stichodactyla gigantea (Sg) t

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Chanchay, Pornchanan, Wanwipa Vongsangnak, Anchana Thancharoen, and Ajaraporn Sriboonlert. "Reconstruction of insect hormone pathways in an aquatic firefly, Sclerotia aquatilis (Coleoptera: Lampyridae), using RNA-seq." PeerJ 7 (August 2, 2019): e7428. http://dx.doi.org/10.7717/peerj.7428.

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Insect hormones: ecdysteroids and juvenile hormones have crucial functions during the regulation of different developmental pathways in insects. Insect metamorphosis is one of the primary pathways regulated by these hormones. The insect hormone biosynthetic pathway is conserved among arthropods, including insects, with some variations in the form of hormones used among each group of insects. In this study, the candidate genes involved in the insect hormone pathways and their functional roles were assessed in an aquatic firefly, Sclerotia aquatilis using a high-throughput RNA sequencing techniq

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Kethidi, Damodar R., Srini C. Perera, S. Zheng, et al. "Identification and Characterization of a Juvenile Hormone (JH) Response Region in the JH Esterase Gene from the Spruce Budworm,Choristoneura fumiferana." Journal of Biological Chemistry 279, no. 19 (2004): 19634–42. http://dx.doi.org/10.1074/jbc.m311647200.

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Using a differential display of mRNA technique we discovered that the juvenile hormone (JH) esterase gene (Cfjhe) fromChoristoneura fumiferanais directly induced by juvenile hormone I (JH I), and the JH I induction is suppressed by 20-hydroxyecdysone (20E). To study the mechanism of action of these two hormones in the regulation of expression of this gene, we cloned the 1270-bp promoter region of the Cfjhe gene and identified a 30-bp region that is located between –604 and –574 and is sufficient to support both JH I induction and 20E suppression. This 30-bp region contains two conserved hormon

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Chatrath, Ritu, Karen L. Ronningen, Sandra R. Severson, et al. "Endothelium-dependent responses in coronary arteries are changed with puberty in male pigs." American Journal of Physiology-Heart and Circulatory Physiology 285, no. 3 (2003): H1168—H1176. http://dx.doi.org/10.1152/ajpheart.00029.2003.

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In humans, cardiovascular disease begins in young adulthood and is more prevalent in males than females. However, little is known about vascular function during transition to adulthood in males. The aim of this study was to define changes in production of endothelium-derived nitric oxide (NO) and coronary arterial responses during puberty. Plasma was collected from juvenile (2–3 mo of age) and adult (5–6 mo of age) male pigs ( n = 8/group) for measurement of NO, and aortic endothelial cells were collected for measurement of mRNA and protein for endothelial NO synthase (eNOS). Although plasma N

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Lyu, Zihao, Zhixing Li, Jie Cheng, Chunyan Wang, Jingxiang Chen, and Tong Lin. "Suppression of Gene Juvenile Hormone Diol Kinase Delays Pupation in Heortia vitessoides Moore." Insects 10, no. 9 (2019): 278. http://dx.doi.org/10.3390/insects10090278.

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Juvenile hormone diol kinase (JHDK) is a critical enzyme involved in juvenile hormone degradation in insects. In this study, HvJHDK in the Heortia vitessoides Moore (Lepidoptera: Crambidae) transcriptional library was cloned. Stage-specific expression patterns of HvJHDK, HvJHEH, and HvJHE as well as juvenile hormone titers were determined. The three tested enzymes participated in juvenile hormone degradation. Moreover, juvenile hormone titers peaked after larval–larval molts, consistent with a role for juvenile hormone in inhibition of metamorphosis. HvJHDK was subsequently suppressed using RN

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Livingston, Frederick S., and Richard Mooney. "Androgens and Isolation From Adult Tutors Differentially Affect the Development of Songbird Neurons Critical to Vocal Plasticity." Journal of Neurophysiology 85, no. 1 (2001): 34–42. http://dx.doi.org/10.1152/jn.2001.85.1.34.

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Song learning in oscine birds occurs during a juvenile sensitive period. One idea is that this sensitive period is regulated by changes in the electrophysiological properties of neurons in the telencephalic song nucleus lateral magnocellular nucleus of the anterior neostriatum (LMAN), a structure critical for song development but not adult singing. A corollary of this idea is that manipulations affecting the pace and quality of song learning will concomitantly affect the development of LMAN′s electrophysiological properties. Manipulations known to affect song development include treating juven

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Applebaum, Shalom W., and Noelle A. Granger. "Seventh International Conference on the Juvenile Hormones." Insect Biochemistry and Molecular Biology 30, no. 8-9 (2000): 615. http://dx.doi.org/10.1016/s0965-1748(00)00033-3.

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Kumagami, Hidetaka. "Sex Hormones in Juvenile Nasopharyngeal Angiofibroma Tissue." Auris Nasus Larynx 20, no. 2 (1993): 131–35. http://dx.doi.org/10.1016/s0385-8146(12)80240-9.

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Doumandji, Lotfi, Hubert Matondo, Sébastien Estaran, et al. "Synthesis of retinoid analogues of juvenile hormones." Applied Organometallic Chemistry 31, no. 10 (2017): e3736. http://dx.doi.org/10.1002/aoc.3736.

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Weaver, Robert J., Neil Audsley, and Howard A. Bell. "Ninth International Conference on the Juvenile Hormones." Journal of Insect Physiology 54, no. 6 (2008): 893–94. http://dx.doi.org/10.1016/j.jinsphys.2008.04.014.

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Bodemann, René Roberto, Peter Rahfeld, Magdalena Stock, et al. "Precise RNAi-mediated silencing of metabolically active proteins in the defence secretions of juvenile leaf beetles." Proceedings of the Royal Society B: Biological Sciences 279, no. 1745 (2012): 4126–34. http://dx.doi.org/10.1098/rspb.2012.1342.

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Allomones are widely used by insects to impede predation. Frequently these chemical stimuli are released from specialized glands. The larvae of Chrysomelina leaf beetles produce allomones in gland reservoirs into which the required precursors and also the enzymes are secreted from attached gland cells. Hence, the reservoirs can be considered as closed bio-reactors for producing defensive secretions. We used RNA interference (RNAi) to analyse in vivo functions of proteins in biosynthetic pathways occurring in insect secretions. After a salicyl alcohol oxidase was silenced in juveniles of the po

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Cook, Harry, Andrew Zuidhof, Toyoji Kaneko, Hao-Ren Lin, Mei Li Zhang, and Richard E. Peter. "Somatotrop, gonadotrop, and prolactin cells in the pars distalis of juvenile grass carp (Ctenopharyngodon idellus): an immunocytochemical study." Canadian Journal of Zoology 69, no. 3 (1991): 803–6. http://dx.doi.org/10.1139/z91-117.

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The grass carp (Ctenopharyngodon idellus) is an important aquaculture species which is grown in many areas of the world. Because the species is the focus of basic and applied endocrinological studies, it is important to establish whether antibodies raised against common carp hormones will recognize hormones of the grass carp. Immunocytochemistry at the light-microscopic level, using the avidin–biotin complex method, and at the electron-microsopic level, using the protein A – gold method, revealed that rabbit anticarp prolactin, growth hormone, and gonadotropin each reacted with one cell type i

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Roksandic, Dragutin, Marija Simic, Anita Radovanovic, and Dusan Gledic. "Body mass, spleen mass and level of thyroid hormones in juvenile hypothyroid rats." Veterinarski glasnik 60, no. 3-4 (2006): 153–62. http://dx.doi.org/10.2298/vetgl0604153r.

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In this paper, the effect of hypothyroidism on body mass and spleen mass of rats was examined during the prenatal and early juvenile periods. Hypothyroidism was induced by the application of propylthiouracil (PTU) in drinking water to the mothers from the first day of gravidity and during lactation, and the offspring were sacrificed on the 14th and 21st days after birth. The body mass of the juvenile rats was measured just before they were sacrificed. The concentrations of triiodothyronine (T3) and thyroxine (T4) in blood serum were determined in control and treated juvenile rats. The results

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