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General and Comparative Endocrinology

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https://www.readbyqxmd.com/read/28327432/feedback-from-arctic-charr-feed-flavour-stimulation-and-re-feeding-after-feed-deprivation-stimulate-genes-encoding-both-orexigenic-and-anorexigenic-neuropeptides
#1
Anja Striberny, Even H Jørgensen
Despite vast research attention, the knowledge about central mechanisms of appetite regulation in teleost remains inconclusive. A common strategy in studies on appetite regulating mechanisms is to measure the response to feed restriction or - deprivation, but responses vary between fish species and between experiments, and are also likely dependent on the degree of energy perturbation. The anadromous Arctic charr is an interesting model for studying appetite regulation as its feeding cycle comprises months of winter anorexia, and hyperphagia during summer...
March 18, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322764/cloning-expression-and-functional-characterization-on-vitellogenesis-of-estrogen-receptors-in-scatophagus-argus
#2
Xue-Fan Cui, Yuan Zhao, Hua-Pu Chen, Si-Ping Deng, Dong-Neng Jiang, Tian-Li Wu, Chun-Hua Zhu, Guang-Li Li
Estrogen receptors (Er) play a critical role in vitellogenesis. Three ers (erα, erβ1 and erβ2) and vitellogenins (vtg-A, vtg-B and vtg-C) subtypes were isolated in various fish species, while the contribution of each Er to the regulation of vtgs expression was not analyzed in detail. Here, erα, erβ1 and erβ2 were cloned and all were found to be expressed in female liver in Scatophagus argus. During proteic vitellogenesis stage, erα was simultaneously up-regulated, while erβ1 and erβ2 were not, with three vtgs in female liver...
March 18, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322762/patterns-of-stress-responses-shift-during-seasonal-life-history-transitions-an-analysis-comparing-baseline-maximal-and-integrated-corticosterone-in-female-red-sided-garter-snakes-thamnophis-sirtalis-parietalis
#3
Catherine A Dayger, Deborah I Lutterschmidt
Glucocorticoids often rise and fall with a variety of external and internal cues and frequently vary among life-history stages. This suggests that changing glucocorticoids may coordinate life-history transitions. To explore this hypothesis, we asked if the time-course of stress-induced glucocorticoid levels differ between two life-history transitions (i.e., spring and fall migration) in female red-sided garter snakes (Thamnophis sirtalis parietalis). We collected non-migratory females from a communal den and migratory females from a road along the migration route and treated them with 4 h of capture stress; plasma corticosterone was measured before, during and after capture stress...
March 18, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322767/cloning-localization-and-differential-expression-of-neuropeptide-y-during-early-brain-development-and-gonadal-recrudescence-in-the-catfish-clarias-gariepinus
#4
Cheni-Chery Sudhakumari, Arumugam Anitha, Raju Murugananthkumar, Dinesh Kumar Tiwari, Dharavath Bhasker, Balasubramanian Senthilkumaran, Aparna Dutta Gupta
Neuropeptide-Y (NPY) has diverse physiological functions which are extensively studied in vertebrates. However, regulatory role of NPY in relation to brain ontogeny and recrudescence with reference to reproduction is less understood in fish. Present report for the first time evaluated the significance of NPY by transient esiRNA silencing and also analyzed its expression during brain development and gonadal recrudescence in the catfish, Clarias gariepinus. As a first step, full-length cDNA of NPY was cloned from adult catfish brain, which shared high homology with its counterparts from other teleosts upon phylogenetic analysis...
March 17, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322766/characterization-of-a-molt-related-myostatin-gene-fmmstn-from-the-banana-shrimp-fenneropenaeus-merguiensis
#5
Rui Qun Zhuo, Ting Ting Zhou, Shi Ping Yang, Siuming Francis Chan
Myostatin is an important member of the Transforming Growth Factor (TGF) family that functions to regulate muscle growth in animals. In this study, the myostatin gene (FmMstn) and two slightly different (short and long forms) cDNAs of the banana shrimp Fenneropenaeus merguiensis were cloned and characterized. Similar to Mstn gene of the scallop, fish and mammal, FmMstn gene consists of 3 exons and 2 introns. The 2 kb upstream promoter region of the FmMstn gene consists of putative response elements for myocyte enhancing factor (MEF2) and E-box factors...
March 17, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322763/thymus-conservation-in-evolution
#6
REVIEW
Antonella Franchini, Enzo Ottaviani
From an evolutionary point of view, the thymus is a new organ observed for the first time in fish concomitantly with the appearance of adaptive clonotypical immunity. Hormone and neuropeptide expression was demonstrated in different species suggesting a conserved role of these molecules. An integrated evolution of immune and neuroendocrine responses appears to have been realized by means of the re-use of ancestral material, such as neuroendocrine cells and mediators, to create a thymic microenvironment for the maturation and differentiation of T cells...
March 17, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322765/hair-cortisol-and-dehydroepiandrosterone-concentrations-in-naturally-taenia-solium-infected-pigs-in-tanzania
#7
Chiara Trevisan, Marta Montillo, Alberto Prandi, Ernatus M Mkupasi, Helena A Ngowi, Maria V Johansen
The aim of this study was to measure hair cortisol and dehydroepiandrosterone (DHEA) concentrations in naturally Taenia solium infected and non-infected control pigs and assess the effect of an environmental change on the aforementioned parameters. Three hair patches were obtained from 13 T. solium infected and 15 non-infected controls sows, respectively corresponding to 3 time points (prior to, at and approximately two weeks after arrival at the research facility). Cortisol and DHEA were extracted using methanol and analysed by radio immune assay...
March 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28322761/pre-gnrh-and-gnrh-induced-testosterone-levels-do-not-vary-across-behavioral-contexts-a-role-for-individual-variation
#8
Medhavi Ambardar, Jennifer L Grindstaff
Hormones can facilitate the expression of behavior, but relatively few studies have considered individual variation and repeatability in hormone-behavior relationships. Repeated measures of hormones are valuable because repeatability in hormone levels might be a mechanism that drives repeatability in behavior ("personality"). Testosterone is predicted to promote territorial aggression and suppress parental behaviors. In our population of eastern bluebirds (Sialia sialis), parental care and nest defense aggression toward a heterospecific are repeatable...
March 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28315656/expression-of-odc1-spd-spm-and-azin1-in-the-hypothalamus-ovary-and-uterus-during-rat-estrous-cycle
#9
Joseph R D Fernandes, Sammit Jain, Arnab Banerjee
The aim of the present study was to investigate variation in the expression pattern of ornithine decarboxylase (ODC1), spermine (SPM), spermidine (SPD) and antizyme inhibitor (AZIN1) in hypothalamus, ovary and uterus during the estrous cycle of rats. Further, to understand any correlation between polyamines and GnRH I expression in hypothalamus; effect of putrescine treatment on GnRH I expression in hypothalamus and progesterone and estradiol levels in serum were investigated. The study also aims in quantifying all the immunohistochemistry images obtained based on pixel counting algorithm to yield the relative pixel count...
March 15, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28283429/editorial-fish-gametes
#10
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
March 7, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28279674/effect-of-photoperiod-and-6-methoxybenzoxazolinone-6-mboa-on-the-reproduction-of-male-brandt-s-voles-lasiopodomys-brandtii
#11
Xin Dai, Jia Shi, Mei Han, Ai Qin Wang, Wan Hong Wei, Sheng Mei Yang
Plant secondary metabolite 6-methoxybenzoxazolinone (6-MBOA) has been suggested to stimulate animal reproduction. 6-MBOA is detected in Leymus chinensis, a main diet of Brandt's vole (Lasiopodomys brandtii). We have previously reported a stimulatory effect of 6-MBOA on reproduction of male Brandt's voles under a short-day photoperiod. The goal of this study was to investigate the effect of 6-MBOA on reproductive physiology of male Brandt's voles under a long-day photoperiod and examine if 6-MBOA under this photoperiodic regime altered the reproductive status of male Brandt's voles differently than the short-day photoperiod...
March 6, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28279673/social-rank-dependent-expression-of-gonadotropin-releasing-hormones-and-kisspeptin-in-the-medaka-brain
#12
Nao Kagawa, Sayuri Hirose, Keiko Fujimoto, Chihomi Nomura, Yuuma Fujita, Akira Honda, Mai Komori
Social interactions regulate the expression of several neuropeptides that have a central role in the reproductive system of mammals. Nonmammalian vertebrates also have these neuropeptides or paralogs, however, studies on the social regulation of reproductive physiology in nonmammalian species are limited. In this study, we examined whether the expression of gonadotropin-releasing hormones (GnRHs) and kisspeptin (Kiss1) is affected by social hierarchy resulting from the outcomes of male-male competition in medaka fish (Oryzias latipes)...
March 6, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28263819/cortisol-plays-a-role-in-the-high-environmental-ammonia-associated-suppression-of-the-immune-response-in-zebrafish
#13
A F Gonçalves, J V Neves, J Coimbra, P Rodrigues, M M Vijayan, J M Wilson
Exposure to high environmental ammonia (HEA) levels increases the vulnerability of fishes to parasitic, viral and bacterial diseases. We tested the hypothesis that elevated plasma cortisol levels play a role in the HEA-mediated immunosuppression in fishes. To this end, we tested the effect of exogenous cortisol treatment on the lipopolysaccharide (LPS)-induced immune response in zebrafish (Danio rerio). Also, to test whether glucocorticoid receptor (GR) signaling is involved in HEA-mediated immunosuppression, zebrafish were treated with mifepristone, a GR antagonist, and the LPS-induced immune response assessed after HEA exposure...
March 2, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28263818/glucocorticoids-induced-high-fat-diet-preference-via-activating-hypothalamic-ampk-signaling-in-chicks
#14
Lei Liu, Xiaojuan Wang, Hongchao Jiao, Hai Lin
Glucocorticoids (GCs) stimulate appetite, contributing to enhanced fat deposition. Our present study was conducted to determine whether GCs could evoke an appetite specifically for fat-rich diets in chicks. Chicks were subjected to a subcutaneous injection of corticosterone (CORT, 2 mg/kg body weight/day) or corn oil (control), and food preference was tested. The results showed that CORT-chicks consumed more high-fat diet (HFD) compared with controls. In HFD-fed chicks, hypothalamic phosphorylated AMP-activated protein kinase α (AMPKα) and neuropeptide Y (NPY) mRNA levels were increased by CORT treatment...
March 2, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28263817/mir-34a-contributes-to-diabetes-related-cochlear-hair-cell-apoptosis-via-sirt1-hif-1%C3%AE-signaling
#15
Ying Lin, Jinjin Shen, Danfeng Li, Jie Ming, Xiangyang Liu, Nana Zhang, Jingbo Lai, Min Shi, Qiuhe Ji, Ying Xing
Type 2 diabetes (T2DM) has been considered to be associated with a higher likelihood of hearing impairment (HI). However, the molecular mechanisms underlying the association between diabetes and HI are poorly understood. MicroRNAs have recently been demonstrated to be closely associated with hearing loss and considered as promising therapeutic targets. Herein, we investigated whether miR-34a contributes to diabetes-related cochlear hair cell apoptosis and sought to identify the underlying mechanism. The results showed that miR-34a was up-regulated in the cochleas of db/db mice, accompanied by significant hearing threshold elevation and hair cell loss...
March 2, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28249777/analyses-of-the-cellular-clock-gene-expression-in-peripheral-tissue-caudal-fin-in-the-japanese-flounder-paralichthys-olivaceus
#16
Makoto Mogi, Hayato Yokoi, Tohru Suzuki
Understanding the systems for maintaining the circadian rhythms that give organisms the flexibility to adapt to environmental changes is important in both aquaculture and fish chronobiology, because nursery lighting conditions can affect the survival and growth rates of larvae. We previously demonstrated that in flounder, the suprachiasmatic nucleus (SCN) exhibits daily rhythm in per2 expression, in sharp contrast to zebrafish, in which the SCN does not exhibit clear per2 expression rhythm. To examine whether a hierarchy exists in systems that maintain the expression rhythm of peripheral clock genes in flounder, in the present study we analyzed the in vivo and in vitro expression of three clock genes, per2, per1, and cry1, in the caudal fin and the effects of cortisol and melatonin administration on the expression of each clock gene...
March 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28242309/does-motilin-peptide-regulate-gastrointestinal-motility-of-zebrafish-an-in-vitro-study-using-isolated-intestinal-strips
#17
Takio Kitazawa, Maria Yoshida, Hiroki Teraoka, Hiroyuki Kaiya
Motilin (MOT), a 22-amino-acid peptide hormone produced in the duodenal mucosa, stimulates gastrointestinal motility in mammals and birds, and it is a mediator of interdigestive motor complexes. Recently, expression of MOT-like peptide (MOTLP) and its receptor mRNAs was identified in zebrafish. The aim of the present study was to determine whether the zebrafish MOTLP (zfMOTLP, HIAFFSPKEMRELREKE) affects zebrafish gastrointestinal motility, with comparison to the effect of human MOT, in which five amino acids are identical to zfMOTLP at positions 5, 9, 15, 16, and 17...
February 24, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28242308/molecular-characterisation-and-expression-of-parathyroid-hormone-related-protein-in-the-caudal-neurosecretory-system-of-the-euryhaline-flounder-platichthys-flesus
#18
Weiqun Lu, Yingying Jin, Jinling Xu, Michael P Greenwood, Richard J Balment
Parathyroid hormone-related protein (PTHrP) is a hypercalcemic factor in fish, but the source of circulating PTHrP remains unclear. In this study investigation of the caudal neurosecretory system (CNSS), considered one of major sources of PTHrP in fish, provided valuable insights into this regulatory system. We report pthrpa and pthrpb gene cloning, characterization, expression, and responses to low salinity and hypocalcemia challenge in flounder. The pthrpa and pthrpb precursors, isolated from a European flounder CNSS library, consist of 166 and 192 amino acid residues, respectively, with an overall homology of approximately 59...
February 24, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28242307/molecular-identification-of-the-dyn-kor-system-and-its-potential-role-in-the-reproductive-axis-of-goldfish
#19
Yali Liu, Shuisheng Li, Qing Wang, Yu Chen, Xin Qi, Yun Liu, Xiaochun Liu, Haoran Lin, Yong Zhang
To ascertain the significance of the dynorphin/kappa-opioid receptor (Dyn/Kor) system in fish reproduction, prodynorphin (pdyn) cDNA was cloned from goldfish. Two Dyn peptides (DynA and DynB) are present in the goldfish prodynorphin precursor. Both DynA and DynB are biologically active as they are able to functionally interact with the goldfish Kor expressed in cultured eukaryotic cells to suppress forskolin-induced CRE promoter activity. RT-PCR analysis showed that pdyn is widely expressed in brain regions, with the highest expression in hypothalamus...
February 24, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28242306/characteristics-of-the-brown-hagfish-paramyxine-atami-transthyretin-metal-ion-dependent-thyroid-hormone-binding
#20
Shunsuke Suzuki, Kentaro Kasai, Norihito Nishiyama, Akinori Ishihara, Kiyoshi Yamauchi
Transthyretin (TTR) is a vertebrate-specific protein involved in thyroid hormone distribution in plasma, and its gene is thought to have emerged by gene duplication from the gene for the ancient TTR-related protein, 5-hydroxyisourate hydrolase, at some early stage of chordate evolution. We investigated the molecular and hormone-binding properties of the brown hagfish Paramyxine atami TTR. The amino acid sequence deduced from the cloned hagfish TTR cDNA shared 33-50% identities with those of other vertebrate TTRs but less than 24% identities with those of vertebrate and deuterostome invertebrate 5-hydroxyisourate hydrolases...
February 24, 2017: General and Comparative Endocrinology
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