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https://www.readbyqxmd.com/read/29045584/oxytocin-fails-to-recruit-serotonergic-neurotransmission-in-the-autistic-brain
#1
Arthur Lefevre, Raphaëlle Mottolese, Jérôme Redouté, Nicolas Costes, Didier Le Bars, Marie-Maude Geoffray, Marion Leboyer, Angela Sirigu
Oxytocin (OT), a neuropeptide involved in affiliation has been shown to enhance social skills in patients with autism spectrum disorders (ASD). Nevertheless, OT improvements seem ephemeral. Animal research has demonstrated OT action on serotonin (5-HT), an interaction that we also found in the healthy human brain. Whether such synaptic interplay also occurs in ASD patients is unknown. To address this issue, we mapped the effects of intranasal OT on 5-HT in 18 patients with ASD and 24 healthy controls (HC) in a double blind, placebo controlled, within subject PET-scan experiment...
October 17, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29044774/3d-distribution-of-tyrosine-hydroxylase-vasopressin-and-oxytocin-neurons-in-the-transparent-postnatal-mouse-brain
#2
David Godefroy, Chloé Dominici, Hélène Hardin-Pouzet, Youssef Anouar, Stéphane Melik-Parsadaniantz, William Rostene, Annabelle Reaux-Le Goazigo
Over the years, advances in immunohistochemistry techniques have been a critical step in detecting and mapping neuromodulatory substances in the central nervous system. The better quality and specificity of primary antibodies, new staining procedures and the spectacular development of imaging technologies have allowed such progress. Very recently, new methods permitting tissue transparency have been successfully used on brain tissues. In this work, we combined whole-mount immunostaining for tyrosine hydroxylase (TH), oxytocin (OXT) and arginine vasopressin (AVP), with iDISCO+ clearing method, light-sheet microscopy and semi automated counting of 3D-labelled neurons to obtain a 3D distribution of these neuronal populations in a 5-day postnatal (P5) mouse brain...
October 16, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/29040763/oxytocin-effects-on-self-referential-processing-behavioral-and-neuroimaging-evidence
#3
Yi Liu, Bing Wu, Xuena Wang, Wenxin Li, Ting Zhang, Xinhuai Wu, Shihui Han
Oxytocin (OT) influences other-oriented mental processes (e.g., trust and empathy) and the underlying neural substrates. However, whether and how OT modulates self-oriented processes and the underlying brain activity remains unclear. Using a double-blind, placebo-controlled between-subjects design, we manipulated memory encoding and retrieval of trait adjectives related to the self, a friend and a celebrity in a self-referential task in male adults. Experiment 1 (N = 51) found that OT vs. placebo treatments reduced response times during encoding self-related trait adjectives but increased recognition scores of self-related information during memory retrieval...
October 4, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29037599/neural-basis-of-ventromedial-hypothalamic-oxytocin-driven-decrease-in-appetite
#4
Oscar A Klockars, Joseph R Waas, Anica Klockars, Allen S Levine, Pawel K Olszewski
OBJECTIVES: Oxytocin (OT) administration in the ventromedial hypothalamic nucleus (VMH) reduces chow intake. The nature of VMH OT's anorexigenic action remains unclear. Here we provide insight into neural mechanisms underlying VMH OT-driven anorexia by (a) identifying feeding-related brain sites activated by VMH OT injection; (b) measuring VMH OT receptor (OTr) mRNA changes in response to hunger and palatability; and (c) examining how VMH OT affects episodic sweet solution intake in sated and hungry rats...
October 13, 2017: Neuroscience
https://www.readbyqxmd.com/read/29036358/divergent-effects-of-oxytocin-on-para-limbic-reactivity-to-emotional-and-neutral-scenes-in-females-with-and-without-borderline-personality-disorder
#5
Alexander Lischke, Sabine C Herpertz, Christoph Berger, Gregor Domes, Matthias Gamer
Borderline personality disorder (BPD) patients' hypersensitivity for emotionally relevant stimuli has been suggested be due to abnormal activity and connectivity in (para-)limbic and prefrontal brain regions during stimulus processing. The neuropeptide oxytocin has been shown to modulate activity and functional connectivity in these brain regions, thereby optimizing the processing of emotional and neutral stimuli. To investigate whether oxytocin would be capable of attenuating BPD patients' hypersensitivity for such stimuli, we recorded brain activity and gaze behavior during the processing of complex scenes in 51 females with and 48 without BPD after intranasal application of either oxytocin or placebo...
September 19, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29035307/effects-of-three-lipidated-oxytocin-analogs-on-behavioral-deficits-in-cd38-knockout-mice
#6
Stanislav M Cherepanov, Shirin Akther, Tomoko Nishimura, Anna A Shabalova, Akira Mizuno, Wataru Ichinose, Satoshi Shuto, Yasuhiko Yamamoto, Shigeru Yokoyama, Haruhiro Higashida
Oxytocin (OT) is a nonapeptide that plays an important role in social behavior. Nasal administration of OT has been shown to improve trust in healthy humans and social interaction in autistic subjects. As is consistent with the nature of a peptide, OT has some unfavorable characteristics: it has a short half-life in plasma and shows poor permeability across the blood-brain barrier. Analogs with long-lasting effects may overcome these drawbacks. To this end, we have synthesized three analogs: lipo-oxytocin-1 (LOT-1), in which two palmitoyl groups are conjugated to the cysteine and tyrosine residues, lipo-oxytocin-2 (LOT-2) and lipo-oxytocin-3 (LOT-3), which include one palmitoyl group conjugated at the cysteine or tyrosine residue, respectively...
October 16, 2017: Brain Sciences
https://www.readbyqxmd.com/read/29024132/expression-of-isotocin-is-male-specifically-upregulated-by-gonadal-androgen-in-the-medaka-brain
#7
Junpei Yamashita, Yukika Kawabata, Kataaki Okubo
Oxytocin, a mammalian neuropeptide primarily synthesized in the supraoptic and paraventricular nuclei of the hypothalamus, mediates a variety of physiological and behavioral processes ranging from parturition and lactation to affiliation and prosociality. Multiple studies in rodents have shown that the expression of the oxytocin gene (Oxt) is stimulated by estrogen, while androgen has no apparent effect. However, this finding is not consistent across all studies, and no study has examined sex steroid regulation of Oxt or its orthologs in other animals...
October 10, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28977525/oxytocin-reduces-cocaine-cued-fos-activation-in-a-regionally-specific-manner
#8
Kah-Chung Leong, Linnea R Freeman, Carole R Berini, Shannon M Ghee, Ronald E See, Carmela M Reichel
Background: Oxytocin may be a possible treatment for multiple neuropsychiatric disorders, including cocaine addiction. Little is known about the site-specific effects of oxytocin on various drug addiction-related brain regions. Furthermore, sexually dimorphic effects of oxytocin on neural function in the addiction circuit have not been established. Here, we studied Fos expression following cocaine-cued reinstatement in both male and female rats. Methods: Male and female rats underwent self-administration, extinction, and reinstatement tests...
October 1, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28965930/intranasal-oxytocin-decreases-cross-frequency-coupling-of-neural-oscillations-at-rest
#9
Helena J V Rutherford, Xiaoyue M Guo, Jia Wu, Kelsey M Graber, Nathan J Hayes, Kevin A Pelphrey, Linda C Mayes
Recent research has suggested a role for the hormone oxytocin in social cognition and behavior. Administration of intranasal oxytocin modulates multiple brain regions during experimental tasks; however, the neural mechanisms that underscore the changes associated with oxytocin administration are yet to be fully elucidated. In a double-blind placebo controlled design using electroencephalography, the effects of intranasal oxytocin on neural oscillations (delta, theta, alpha, beta) and their coupling during the resting state were examined...
September 28, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28965836/oxytocin-and-pain-perception-from-animal-models-to-human-research
#10
REVIEW
S Boll, A C Almeida de Minas, A Raftogianni, S C Herpertz, V Grinevich
An accumulating body of evidence suggests that the hypothalamic neuropeptide oxytocin (OT) has a modulatory effect on pain processing. Particularly strong evidence comes from animal models. Here, we review recent advances in animal research on the analgesic effects of OT and discuss possible target sites of OT within descending and ascending pain pathways in the brain. In addition to the spinal cord being a direct target of the neuropeptide, OT has also been shown to modulate the neuronal activity of limbic and cortical brain regions, which play a major role in the cognitive and emotional processing of pain...
September 28, 2017: Neuroscience
https://www.readbyqxmd.com/read/28963465/the-oxytocinergic-system-modulates-sadistic-context-dependent-empathy-in-humans
#11
Siyang Luo, Yiyi Zhu, Ying Xu, Qianting Kong
The oxytocinergic system is crucial for sociality and well-being and is associated with empathy. It is suggested that the oxytocinergic system exerts context- and person-dependent effects. We examined how sexual sadistic contexts influenced the effects of the oxytocinergic system on empathic-related behaviors and brain activity in healthy adults. Combining genetic neuroimaging, pharmacological techniques and a psychological paradigm of empathy, we recorded EEG neural responses in female OXTR rs53756 G/G and A/A carriers and measured subjective empathic ratings after intranasal administration of oxytocin/placebo in healthy male adults during the perception of painful facial expressions in sadistic/general social contexts...
September 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28963257/gating-of-social-reward-by-oxytocin-in-the-ventral-tegmental-area
#12
Lin W Hung, Sophie Neuner, Jai S Polepalli, Kevin T Beier, Matthew Wright, Jessica J Walsh, Eastman M Lewis, Liqun Luo, Karl Deisseroth, Gül Dölen, Robert C Malenka
The reward generated by social interactions is critical for promoting prosocial behaviors. Here we present evidence that oxytocin (OXT) release in the ventral tegmental area (VTA), a key node of the brain's reward circuitry, is necessary to elicit social reward. During social interactions, activity in paraventricular nucleus (PVN) OXT neurons increased. Direct activation of these neurons in the PVN or their terminals in the VTA enhanced prosocial behaviors. Conversely, inhibition of PVN OXT axon terminals in the VTA decreased social interactions...
September 29, 2017: Science
https://www.readbyqxmd.com/read/28963040/beta-carotene-as-a-novel-therapy-for-the-treatment-of-autistic-like-behavior-in-animal-models-of-autism
#13
Yosefa Avraham, Elliot M Berry, Marina Donskoy, Wiessam Abu Ahmad, Lia Vorobiev, Amnon Albeck, David Mankuta
Autism-affected individuals are characterized by lower plasma oxytocin and its ectoenzyme regulator CD38. Oxytocin, a hypothalamic hormone secreted upon the release of CD38, plays a role in social behavior and bonding. All-trans retinoic acid is a potent inducer of CD38 and can be used as a novel therapeutic strategy in autism. We investigated the role of beta-carotene in rescuing autistic-like behavior in BALB/c and BTBR mice. Beta-carotene derivatives are preferred as they are neither toxic nor teratogenic...
September 26, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28960210/the-effects-of-oxytocin-on-eating-behaviour-and-metabolism-in-humans
#14
REVIEW
Elizabeth A Lawson
Oxytocin, a hypothalamic hormone that is secreted directly into the brain and enters the peripheral circulation through the posterior pituitary gland, regulates a range of physiologic processes, including eating behaviour and metabolism. In rodents and nonhuman primates, chronic oxytocin administration leads to sustained weight reduction by reducing food intake, increasing energy expenditure and inducing lipolysis. Oxytocin might improve glucose homeostasis, independently of its effects on weight. Clinical studies are beginning to translate these important preclinical findings to humans...
September 29, 2017: Nature Reviews. Endocrinology
https://www.readbyqxmd.com/read/28957529/oxytocin-neurons-exhibit-extensive-functional-plasticity-due-to-offspring-age-in-mothers-and-fathers
#15
Aubrey M Kelly, Lisa C Hiura, Alexander G Saunders, Alexander G Ophir
The needs of offspring change as they develop. Thus, parents should concomitantly change their investment based on the age-related needs of the offspring as they mature. Due to the high costs of parental care, it is optimal for parents to exhibit a shift from intense caregiving of young offspring to promoting independence in older offspring. Yet, the neural mechanisms that underlie shifts in parental behavior are poorly understood, and little is known about how the parental brain responds to offspring of different ages...
September 1, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28956334/a-role-for-phosphodiesterase-11a-pde11a-in-the-formation-of-social-memories-and-the-stabilization-of-mood
#16
Michy P Kelly
The most recently discovered 3',5'-cyclic nucleotide phosphodiesterase family is the Phosphodiesterase 11 (PDE11) family, which is encoded by a single gene PDE11A. PDE11A is a dual-specific PDE, breaking down both cAMP and cGMP. There are four PDE11A splice variants (PDE11A1-4) with distinct tissue expression profiles and unique N-terminal regulatory regions, suggesting that each isoform could be individually targeted with a small molecule or biologic. PDE11A4 is the PDE11A isoform expressed in brain and is found in the hippocampal formation of humans and rodents...
2017: Advances in Neurobiology
https://www.readbyqxmd.com/read/28950923/adverse-life-events-psychiatric-history-and-biological-predictors-of-postpartum-depression-in-an-ethnically-diverse-sample-of-postpartum-women
#17
J Guintivano, P F Sullivan, A M Stuebe, T Penders, J Thorp, D R Rubinow, S Meltzer-Brody
BACKGROUND: Race, psychiatric history, and adverse life events have all been independently associated with postpartum depression (PPD). However, the role these play together in Black and Latina women remains inadequately studied. Therefore, we performed a case-control study of PPD, including comprehensive assessments of symptoms and biomarkers, while examining the effects of genetic ancestry. METHODS: We recruited our sample (549 cases, 968 controls) at 6 weeks postpartum from obstetrical clinics in North Carolina...
September 27, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28947180/oxytocin-selectively-modulates-brain-processing-of-disgust-in-huntington-s-disease-gene-carriers
#18
Izelle Labuschagne, Govinda Poudel, Catarina Kordsachia, Qizhu Wu, Hannah Thomson, Nellie Georgiou-Karistianis, Julie C Stout
People with Huntington's disease (HD) exhibit altered processing of emotional information, especially disgust and other negative emotions. These impairments are likely due to the effects of the disease on underlying brain networks. We examined whether oxytocin, when given intranasally, would normalise aberrant brain reactivity to emotional faces in participants with the gene-expansion for HD. In a double-blind placebo-controlled cross-over design, we measured brain activity, using functional magnetic resonance imaging, whilst nine medication-free HD carriers, and ten control participants viewed emotional (disgust, fear, angry, sad, surprise, happy) and neutral faces, following acute intranasal oxytocin (24IU) and placebo...
September 23, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28942596/the-multidimensional-therapeutic-potential-of-targeting-the-brain-oxytocin-system-for-the-treatment-of-substance-use-disorders
#19
Michael T Bowen, Inga D Neumann
The neuropeptide oxytocin is released both into the blood and within the brain in response to reproductive stimuli, such as birth, suckling and sex, but also in response to social interaction and stressors. Substance use disorders, or addictions, are chronic, relapsing brain disorders and are one of the major causes of global burden of disease. Unfortunately, current treatment options for substance use disorders are extremely limited and a treatment breakthrough is sorely needed. There is mounting preclinical evidence that targeting the brain oxytocin system may provide that breakthrough...
September 24, 2017: Current Topics in Behavioral Neurosciences
https://www.readbyqxmd.com/read/28930284/effects-of-intranasal-oxytocin-on-the-blood-oxygenation-level-dependent-signal-in-food-motivation-and-cognitive-control-pathways-in-overweight-and-obese-men
#20
Franziska Plessow, Dean A Marengi, Sylvia K Perry, Julia M Felicione, Rachel Franklin, Tara M Holmes, Laura M Holsen, Nikolaos Makris, Thilo Deckersbach, Elizabeth A Lawson
Recent research indicates that the hypothalamic neuropeptide hormone oxytocin is a key central nervous system factor in the regulation of food intake and weight. However, the mechanisms underlying the anorexigenic effects of oxytocin in humans are unknown and critical to study in order to consider oxytocin as a neurohormonal weight loss treatment. We performed a randomized, double-blind, placebo-controlled crossover study with single-dose intranasal oxytocin (24 IU) in ten overweight or obese, otherwise healthy men...
September 20, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
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