Showing papers in "General and Comparative Endocrinology in 2013"

TL;DR: The conclusion is that a consistent, predictable, endocrine response to chronic stress, regardless of the protocol used to induce chronic stress and the species under study, does not exist.

TL;DR: The factors that lead to the observed individual variation and the extent to which this variation is adaptive or non-adaptive are little known in most animals, and future studies of glucocorticoid responses in animals can focus on individual responses and their origins and significance.

TL;DR: A comprehensive overview on the GH-IGF system regulating fish skeletal muscle growth is presented, suggesting other of alternative signaling pathways regulating the transcription of this growth factor.

TL;DR: It is believed that global change can affect the efficiency of the GC stress response to maintain homeostasis and to appropriately regulate these trades-offs and may result in the inability of vertebrates to cope with a changing world.

TL;DR: What is known about ER structure, subtypes, mechanism(s) of action and auto-regulation by estrogens is reviewed, and a proposed model integrating knowledge on autoregulation of the receptor and its functions in the liver is proposed.

TL;DR: High throughput transcriptomics will improve understanding of how intersex condition manifests after exposure to aquatic pollution and it is recommended that studies consider both males with and without intersex that inhabit the same polluted site in order to differentiate pathways associated with xenobiotic responses versus molecular pathways associatedwith intersex.

TL;DR: The minor role of mineralocorticoid signaling (i.e., DOC-MR) in the osmoregulation compared with those of glucoc Cortisol-glucocortioid receptor [GR]), and areas in need of research like on-going experiments with MR-knockout medaka are outlined.

TL;DR: It is proposed that the masculinization induced by thermal stress can be considered as a consequence of cortisol inactivation and the concomitant synthesis of 11-KT and discussed this as a possible mechanism of masculinized induced by different types of environmental stressors.

TL;DR: The role of an important contributor to neural processing, the set of biochemical, molecular, and structural processes collectively referred to as neural plasticity, is reviewed, focusing on work in teleost fishes, while also elucidating conserved aspects.

TL;DR: Use of zebrafish as a model may lead to significant insights into the conserved role of glucocorticoids during early development with potential implications in biomedical research, including fetal stress syndromes in humans.

TL;DR: These findings demonstrate that THs have considerable influence in the sexual ontogeny of male vertebrates, through direct interactions with select sex-determining-genes and regulation of gonadotropin production in the hypothalamus-pituitary-gonad axis.

TL;DR: It was found that hair cortisol did not vary between age and sex, but varied within the foot/leg region to a greater extent than between individuals, and it is recommended that future studies identify a standardized location for hair cortisol sampling.

TL;DR: Advances in the understanding of the hormonal mechanisms of migration are reviewed with particular emphasis on the sub-stages of the migration life history: development, departure, flight and arrival.

TL;DR: GLepA, other than gLepB, functioned in the regulation of energy metabolism and food intake in this Perciform fish, and strong conservation of tertiary structure with that of other vertebrates was found.

TL;DR: The receptor for GnIH is thought to be the G protein-coupled receptor 147 (GPR147) which has been shown to couple predominantly through the Gαi protein to inhibit cAMP production and to act in an autocrine/paracrine manner.

TL;DR: It is concluded that when used with optimal reagent and incubation conditions, this glucocorticoid enzyme immunoassay will be useful for non-invasive monitoring of adrenal activity in a wide range of wildlife species.

TL;DR: Fasting for 48h depressed plasma LH and induced fos expression in about half the population of GnIH-ir neurons suggest that GnIh neurons are mediators between feeding and reproductive systems in Pekin drakes.

TL;DR: The data indicate that ghrelin alters food intake by acting on well-known appetite signals, such as CRH, NPY and orexin, in the hypothalamus in a species-specific manner and may modulate foraging/swimming activity and the perception of food in fish.

TL;DR: Data provide evidence that the temporal reactivity of the endocrine stress response, specifically its speed and magnitude, is associated with stable behavioral traits in free-living animals.

TL;DR: Focusing research efforts towards the thorough characterisation of a restricted number of reproductively diverse fish models will help to provide the foundation necessary for a more explicitly evolutionary analysis of PRL function.

TL;DR: A model in which the exogenous L. rhamnosus in the digestive tract of zebrafish from the first days of life through sexual maturation positively influences the physiological performances ofZebrafish was evidenced and a number of pathways that might be influenced by the presence of this human probiotic strain were proposed.

TL;DR: It is proposed that birds with low corticosterone responses and proactive personalities are likely to be more successful (have greater fitness) in constant or predictable conditions, whilst birds with reactive personalities and high cortic testosterone responses will be more success in changing or unpredictable conditions.

TL;DR: Evidence is provided that fish reproduction may be directly affected by further global warming and that abnormal high water temperature impairs the expression of important genes throughout the brain-pituitary-gonad axis.

TL;DR: CORT and c-Fos studies suggest that repeated early life Stress may affect neuronal function in region- and temporal-specific manners, indicating a critical period for habituation to early life stress.

TL;DR: The simultaneous recovery from the hypothyroid and ovary-inducing effects of methimazole by 60 dpf suggests that the Ovary-skewing effect of goitrogens is reversible when thyroid conditions return to basal levels before developmental commitment of gonadal sex, and the masculinizing effect of hyperthyroidism seems to be stable and perhaps permanent.

TL;DR: A de novo assembled transcriptome is generated and used to identify peptide precursor proteins and receptors for C. finmarchicus to provide a foundation for experiments directed at understanding the physiological roles served by them in this species.

TL;DR: Examination of the expression of genes reflecting Sertoli cell function and spermatogenic development in adult zebrafish testis after DHP treatment indicates an up-regulation of the activity of the Igf signaling system, and results show that DHPtreatment induced the proliferation of early sperMatogonia, their differentiation into late sper matogonia and sPermatocytes as well as expression of marker genes for these germ cell stages.

TL;DR: The diversity of estrogen actions raises questions whether current risk assessment strategies are protective of the wider potential health effects of estrogens, and whether quantitative environmental threshold concentrations for environmental protection derived from reproductive tests with model fish species are protective for non-reproductive effects as well.

TL;DR: The purpose of this short review is to bring together the current knowledge on the biological effects of melatonin on fish reproduction mainly focusing on carp.

TL;DR: The proposed role attributed to kisspeptins as key factors in the onset of reproduction in fish receives an additional support from the data obtained in the present work.