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Hormones and Behavior

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https://www.readbyqxmd.com/read/28720488/hormonal-correlates-of-natal-dispersal-and-rank-attainment-in-wild-male-baboons
#1
Mercy Y Akinyi, Laurence R Gesquiere, Mathias Franz, Patrick O Onyango, Jeanne Altmann, Susan C Alberts
In many mammals, maturational milestones such as dispersal and the attainment of adult dominance rank mark stages in the onset of reproductive activity and depend on a coordinated set of hormonal and socio-behavioral changes. Studies that focus on the link between hormones and maturational milestones are uncommon in wild mammals because of the challenges of obtaining adequate sample sizes of maturing animals and of tracking the movements of dispersing animals. We examined two maturational milestones in wild male baboons-adult dominance rank attainment and natal dispersal-and measured their association with variation in glucocorticoids (fGC) and fecal testosterone (fT)...
July 15, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28712589/exposure-to-a-contextually-neutral-stressor-potentiates-fear-conditioning-in-juvenile-rainbow-trout-oncorhynchus-mykiss
#2
Brandon S Demuth, Maud C O Ferrari, Lynn P Weber, David M Janz, Douglas P Chivers
Organisms faced with stressors deploy a suite of adaptive responses in the form of behavioral, physiological and cognitive modifications to overcome the challenge. Interactive effects of these responses are known to influence learning and memory processes and facilitation is thought to be dependent, in part, upon contextual relevance of the stressor to the learning task. Predation is one such stressor for prey animals, and their ability to manage reliable information about predators is essential for adaptive antipredator strategies...
July 13, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28711308/the-impact-of-scopolamine-pretreatment-on-3-iodothyronamine-t1am-effects-on-memory-and-pain-in-mice
#3
Annunziatina Laurino, Ersilia Lucenteforte, Gaetano De Siena, Laura Raimondi
We previously demonstrated that 3-iodothyronamine (T1AM), a by-product of thyroid hormone metabolism, pharmacologically administered to mice acutely stimulated learning and memory acquisition and provided hyperalgesia with a mechanism which remains to be defined. We now aimed to investigate whether the T1AM effect on memory and pain was maintained in mice pre-treated with scopolamine, a non-selective muscarinic antagonist expected to induce amnesia and, possibly, hyperalgesia. Mice were pre-treated with scopolamine and, after 20min, injected intracerebroventricularly (i...
July 12, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28668344/maternal-thyroid-hormone-trajectories-during-pregnancy-and-child-behavioral-problems
#4
Joyce J Endendijk, Hennie A A Wijnen, Victor J M Pop, Anneloes L van Baar
There is ample evidence demonstrating the importance of maternal thyroid hormones, assessed at single trimesters in pregnancy, for child cognition. Less is known, however, about the course of maternal thyroid hormone concentrations during pregnancy in relation to child behavioral development. Child sex might be an important moderator, because there are sex differences in externalizing and internalizing behavioral problems. The current study examined the associations between maternal thyroid hormone trajectories versus thyroid assessments at separate trimesters of pregnancy and child behavioral problems, as well as sex differences in these associations...
July 11, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28687274/rapid-effects-of-estrogens-and-androgens-on-temporal-and-spectral-features-in-ultrasonic-vocalizations
#5
Marcela Fernández-Vargas
No abstract text is available yet for this article.
July 10, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28676252/a-functional-mri-study-on-how-oxytocin-affects-decision-making-in-social-dilemmas-cooperate-as-long-as-it-pays-off-aggress-only-when-you-think-you-can-win
#6
Bruno Lambert, Carolyn H Declerck, Christophe Boone, Paul M Parizel
We investigate if the neuropeptide oxytocin (OT), known to moderate social behaviour, influences strategic decision making in social dilemmas by facilitating the integration of incentives and social cues. Participants (N=29) played two economic games with different incentive structures in the fMRI scanner after receiving OT or placebo (following a double blind, within-subject design). Pictures of angry or neutral faces (the social cues) were displayed alongside the game matrices. Consistent with a priori hypotheses based on the modulatory role of OT in mesolimbic dopaminergic brain regions, the results indicate that, compared to placebo, OT significantly increases the activation of the nucleus accumbens during an assurance (coordination) game that rewards mutual cooperation...
July 1, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28676251/the-not-so-bitter-pill-effects-of-combined-oral-contraceptives-on-peripheral-physiological-indicators-of-emotional-reactivity
#7
Diana Armbruster, Clemens Kirschbaum, Alexander Strobel
Combined oral contraceptives (COC) are used by millions of women worldwide. Although findings are not entirely consistent, COC have been found to impact on brain function and, thus, to modulate affective processes. Here, we investigated electro-physiological responses to emotional stimuli in free cycling women in both the early follicular and late luteal phase as well as in COC users. Skin conductance response (SCR), startle reflex, corrugator and zygomaticus activity were assessed. COC users showed reduced overall startle magnitude and SCR amplitude, but heightened overall zygomaticus activity, although effect sizes were small...
July 1, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28645693/male-mice-ultrasonic-vocalizations-enhance-female-sexual-approach-and-hypothalamic-kisspeptin-neuron-activity
#8
Akari Asaba, Takuya Osakada, Kazushige Touhara, Masahiro Kato, Kazutaka Mogi, Takefumi Kikusui
Vocal communication in animals is important for ensuring reproductive success. Male mice emit song-like "ultrasonic vocalizations (USVs)" when they encounter female mice, and females show approach to the USVs. However, it is unclear whether USVs of male mice trigger female behavioral and endocrine responses in reproduction. In this study, we first investigated the relationship between the number of deliveries in breeding pairs for 4months and USVs syllables emitted from those paired males during 3min of sexual encounter with unfamiliar female mice...
June 29, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28606740/chronic-treatment-with-estradiol-restores-depressive-like-behaviors-in-female-wistar-rats-treated-neonatally-with-clomipramine
#9
Tania Molina-Jímenez, Liliana Landa-Cadena, Herlinda Bonilla-Jaime
Neonatal administration of clomipramine (CMI) induces diverse behavioral and neurochemical alterations in adult male rats that resemble major depression disorder. However, the possible behavioral alterations in adult female rats subjected to neonatal treatment with clomipramine are unknown. Therefore, the aim of this study was to explore the effect of neonatal treatment with CMI on adult female rats in relation to locomotion and behavioral despair during the estrus cycle. Also evaluated was the effect of chronic treatment with E2 on these female CMI rats...
June 29, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28624235/the-effect-of-oxytocin-on-human-directed-social-behaviour-in-dogs-canis-familiaris
#10
REVIEW
Anna Kis, Alin Ciobica, József Topál
The oxytocin system has recently received increasing attention due to its effect on complex human behaviours. In parallel to this, over the past couple of decades, the human-analogue social behaviour of dogs has been intensively studied. Combining these two lines of research (e.g. studying the relationship between dog social behaviour and the oxytocin system) is a promising new research area. The present paper reviews the existing literature on how oxytocin is related to different aspects of human-directed social behaviour in dogs...
June 28, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28576647/testosterone-oxytocin-and-the-development-of-human-parental-care
#11
Ilanit Gordon, Maayan Pratt, Katharina Bergunde, Orna Zagoory-Sharon, Ruth Feldman
The steroid testosterone (T) and neuropeptide oxytocin (OT) have each been implicated in the development of parental care in humans and animals, yet very little research addressed the interaction between these hormones at the transition to parenthood in mothers and fathers. One hundred and sixty mothers and fathers (80 couples) were visited 1 and 6months after the birth of their first child, plasma OT and T were assayed at each time-point, and interactions between each parent and the infant were observed and micro-coded for two key parental behaviors; affectionate touch and parent-infant synchrony...
June 28, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28666923/allopregnanolone-levels-and-depressive-symptoms-during-pregnancy-in-relation-to-single-nucleotide-polymorphisms-in-the-allopregnanolone-synthesis-pathway
#12
Charlotte Hellgren, Erika Comasco, Alkistis Skalkidou, Inger Sundström-Poromaa
Allopregnanolone, a neurosteroid whose levels rise throughout gestation, putatively stabilizes antenatal mood. The present study aimed to investigate associations of plasma allopregnanolone to antenatal depressive symptoms, as well as to genetic and obstetric factors. Allopregnanolone plasma levels from 284 pregnant women were measured around gestational week 18. Haplotype tag single nucleotide polymorphisms in the aldo-keto reductase family 1, members C2 and C4 (AKR1C2, AKR1C4), and steroid 5 alpha-reductase 1 and 2 (SRD5A1, and SRD5A2) genes were genotyped in a larger sample of pregnant women (n=1351)...
June 27, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28596135/administration-of-an-oxytocin-receptor-antagonist-attenuates-sexual-motivation-in-male-rats
#13
D S Blitzer, T E Wells, W R Hawley
In male rats, oxytocin impacts both sexual arousal and certain types of consummatory sexual behaviors. However, the role of oxytocin in the motivational aspects of sexual behavior has received limited attention. Given the role that oxytocin signaling plays in consummatory sexual behaviors, it was hypothesized that pharmacological attenuation of oxytocin signaling would reduce sexual motivation in male rats. Sexually experienced Long-Evans male rats were administered either an oxytocin receptor antagonist (L368,899 hydrochloride; 1mg/kg) or vehicle control into the intraperitoneal cavity 40min prior to placement into the center chamber of a three-chambered arena designed to assess sexual motivation...
June 27, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28571937/thermal-modulation-of-anthropogenic-estrogen-exposure-on-a-freshwater-fish-at-two-life-stages
#14
J L Ward, M K Cox, H Schoenfuss
Human-mediated environmental change can induce changes in the expression of complex behaviors within individuals and alter the outcomes of interactions between individuals. Although the independent effects of numerous stressors on aquatic biota are well documented (e.g., exposure to environmental contaminants), fewer studies have examined how natural variation in the ambient environment modulates these effects. In this study, we exposed reproductively mature and larval fathead minnows (Pimephales promelas) to three environmentally relevant concentrations (14, 22, and 65ng/L) of a common environmental estrogen, estrone (E1), at four water temperatures (15, 18, 21, and 24°C) reflecting natural spring and summer variation...
June 22, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28602941/hormonal-correlates-of-energetic-condition-in-mantled-howler-monkeys
#15
Pedro Américo D Dias, Alejandro Coyohua-Fuentes, Domingo Canales-Espinosa, Roberto Chavira-Ramírez, Ariadna Rangel-Negrín
Hormones have a key role in energy allocation, so their study allows understanding individual metabolic strategies. Because different hormones convey different information on the responses of individuals to energetic demands, a simultaneous analysis of variation in multiple hormones may offer a more reliable picture of metabolic strategies than single hormone assessments. In this study we focused on determining which factors were related to variation in fecal glucocorticoid and thyroid hormone metabolites in wild mantled howler monkeys (Alouatta palliata)...
June 21, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28622973/maternal-programming-of-sex-specific-responses-to-predator-odor-stress-in-adult-rats
#16
Sophie St-Cyr, Sameera Abuaish, Shathveekan Sivanathan, Patrick O McGowan
Prenatal stress mediated through the mother can lead to long-term adaptations in stress-related phenotypes in offspring. This study tested the long-lasting effect of prenatal exposure to predator odor, an ethologically relevant and psychogenic stressor, in the second half of pregnancy. As adults, the offspring of predator odor-exposed mothers showed increased anxiety-like behaviors in commonly used laboratory tasks assessing novelty-induced anxiety, increased defensive behavior in males and increased ACTH stress reactivity in females in response to predator odor...
June 20, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28576645/effects-of-developmental-conditions-on-glucocorticoid-concentrations-in-adulthood-depend-on-sex-and-foraging-conditions
#17
Blanca Jimeno, Michael Briga, Simon Verhulst, Michaela Hau
Developmental conditions in early life frequently have long-term consequences on the adult phenotype, but the adult environment can modulate such long-term effects. Glucocorticoid hormones may be instrumental in mediating developmental effects, but the permanency of such endocrine changes is still debated. Here, we manipulated environmental conditions during development (small vs. large brood size, and hence sibling competition) and in adulthood (easy vs. hard foraging conditions) in a full factorial design in zebra finches, and studied effects on baseline (Bas-CORT) and stress-induced (SI-CORT) corticosterone in adulthood...
June 9, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28576649/anti-androgenic-effects-of-bisphenol-a-on-spatial-memory-and-synaptic-plasticity-of-the-hippocampus-in-mice
#18
Zhaoqing Fang, Qingjie Zhu, Ting Gu, Xiuying Shen, Yang Yang, Yufeng Liang, Zigui Zhang, Xiaohong Xu
Bisphenol-A (BPA) is a common environmental endocrine disruptor. Our recent studies found that exposure to BPA in both adolescent and adulthood sex-specifically impaired spatial memory in male mice. In this study, 11-week-old gonadectomied (GDX) male mice daily received subcutaneous injections of testosterone propionate (TP, 0.5mg/kg), TP and BPA (0.4 and 4mg/kg), or vehicle for 45days. The results of Morris water maze task showed that exposure to BPA did not affect the spatial memory of GDX mice but impaired that of sham (4mg/kg/day) and TP-treated GDX mice (0...
June 8, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28576648/sex-differences-and-sex-hormones-in-anxiety-like-behavior-of-aging-rats
#19
Emese Domonkos, Veronika Borbélyová, Melinda Csongová, Martin Bosý, Mária Kačmárová, Daniela Ostatníková, Július Hodosy, Peter Celec
Sex differences in the prevalence of affective disorders might be attributable to different sex hormone milieu. The effects of short-term sex hormone deficiency on behavior, especially on anxiety have been studied in numerous animal experiments, mainly on young adult rats and mice. However, sex differences in aged animals and the effects of long-term hypogonadism are understudied. The aim of our study was to analyze sex differences in anxiety-like behavior in aged rats and to prove whether they can be attributed to endogenous sex hormone production in males...
June 8, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28576646/increase-in-hypothalamic-ampk-phosphorylation-induced-by-prolonged-exposure-to-lps-involves-ghrelin-and-cb1r-signaling
#20
Priscila M S Rivas, Fernanda M V Vechiato, Beatriz C Borges, Rodrigo Rorato, Jose Antunes-Rodrigues, Lucila L K Elias
Acute administration of lipopolysaccharide (LPS) from Gram-negative bacteria induces hypophagia. However, the repeated administration of LPS leads to desensitization of hypophagia, which is associated with increased hypothalamic p-AMPK expression. Because ghrelin and endocannabinoids modulate AMPK activity in the hypothalamus, we hypothesized that these neuromodulators play a role in the reversal of tolerance to hypophagia in rats under long-term exposure to LPS. Male Wistar rats were treated with single (1 LPS, 100μg/kg body weight, ip) or repeated injections of LPS over 6days (6 LPS)...
June 8, 2017: Hormones and Behavior
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