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Arginine vasopressin

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https://www.readbyqxmd.com/read/28325880/balancing-selection-maintains-polymorphisms-at-neurogenetic-loci-in-field-experiments
#1
Eija Lonn, Esa Koskela, Tapio Mappes, Mikael Mokkonen, Angela M Sims, Phillip C Watts
Most variation in behavior has a genetic basis, but the processes determining the level of diversity at behavioral loci are largely unknown for natural populations. Expression of arginine vasopressin receptor 1a (Avpr1a) and oxytocin receptor (Oxtr) in specific regions of the brain regulates diverse social and reproductive behaviors in mammals, including humans. That these genes have important fitness consequences and that natural populations contain extensive diversity at these loci implies the action of balancing selection...
March 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28316971/exercise-associated-hyponatremia-2017-update
#2
REVIEW
Tamara Hew-Butler, Valentina Loi, Antonello Pani, Mitchell H Rosner
Exercise-associated hyponatremia (EAH) was initially described in the 1980s in endurance athletes, and work done since then has conclusively identified that overdrinking beyond thirst and non-osmotic arginine vasopressin release are the most common etiologic factors. In recent years, EAH has been described in a broader variety of athletic events and also has been linked to the development of rhabdomyolysis. The potential role of volume and sodium depletion in a subset of athletes has also been described. This review focuses on the most recent literature in the field of EAH and summarizes key new findings in the epidemiology, pathophysiology, treatment, and prevention of this condition...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28294453/a-translational-approach-for-nmda-receptor-profiling-as-a-vulnerability-biomarker-for-depression-and-schizophrenia
#3
Handan Gunduz-Bruce, Joshua Kenney, Suravi Changlani, Aldo Peixoto, Ralitza Gueorguieva, Cheryl Leone, Nina Stachenfeld
Altered N-methyl-D-aspartate (NMDA) receptor activity and glutamate signaling may underlie the pathogenesis of both schizophrenia and depression in subgroups of patients. In schizophrenia, pharmacologic modeling, postmortem and imaging data suggest reduced NMDA signaling. In contrast, recent clinical trials demonstrating the efficacy of the NMDA antagonist ketamine in severely depressed patients suggest increased NMDA receptor signaling. We conducted a proof of concept study to assess whether there is any in vivo evidence for an inverse association in depression and schizophrenia with respect to the NMDA receptor function...
March 13, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28293470/hypothalamic-pituitary-adrenal-axis-and-depression-symptom-effects-of-an-arginine-vasopressin-type-1b-receptor-antagonist-in-a-one-week-randomized-phase-1b-trial
#4
David A Katz, Charles Locke, Nicholas Greco, Wei Liu, Katherine A Tracy
BACKGROUND: Arginine vasopressin 1B receptor (V1B) antagonists may have utility for the treatment of major depressive disorder (MDD). METHODS: The V1B antagonist ABT-436 (N = 31) or matching placebo (N = 20) was administered to MDD subjects for 7 days. The main study objectives were to assess the safety and hypothalamic-pituitary-adrenal axis (HPA) effects of ABT-436 in MDD subjects. MDD symptoms were assessed using the 17-item Hamilton Depression Rating Scale (HAM-D-17) and the subject-rated Mood and Anxiety Symptom Questionnaire (MASQ)...
March 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28288796/opposite-effects-of-nonapeptide-antagonists-on-paternal-behavior-in-the-teleost-fish-amphiprion-ocellaris
#5
Ross DeAngelis, Joseph Gogola, Logan Dodd, Justin S Rhodes
The nonapeptides isotocin (IT) and arginine vasotocin (AVT), along with their mammalian homologs oxytocin and arginine vasopressin, are well known regulators of social behaviors across vertebrate taxa. However, little is known about their involvement in paternal care. Here, we measured the effect of an IT and an AVT V1a receptor antagonist on paternal behaviors in the primarily paternal teleost Amphiprion ocellaris. We also measured the effect of the IT receptor antagonist on aggression in dyadic contests between two non-reproductive fish to assess specificity of the effect on paternal behaviors...
March 17, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28288570/effect-of-tolvaptan-on-renal-water-and-sodium-excretion-and-blood-pressure-during-nitric-oxide-inhibition-a-dose-response-study-in-healthy-subjects
#6
Safa Al Therwani, Jeppe Bakkestrøm Rosenbæk, Frank Holden Mose, Jesper Nørgaard Bech, Erling Bjerregaard Pedersen
BACKGROUND: Tolvaptan is a selective vasopressin receptor antagonist. Nitric Oxide (NO) promotes renal water and sodium excretion, but the effect is unknown in the nephron's principal cells. In a dose-response study, we measured the effect of tolvaptan on renal handling of water and sodium and systemic hemodynamics, during baseline and NO-inhibition with L-NMMA (L-NG-monomethyl-arginine). METHODS: In a randomized, placebo-controlled, double blind, cross over study, 15 healthy subjects received tolvaptan 15, 30 and 45 mg or placebo...
March 13, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28283809/genes-related-to-oxytocin-and-arginine-vasopressin-pathways-associations-with-autism-spectrum-disorders
#7
REVIEW
Rong Zhang, Hong-Feng Zhang, Ji-Sheng Han, Song-Ping Han
Autism spectrum disorder (ASD) is a highly heritable neurodevelopmental disorders characterized by impaired social interactions, communication deficits, and repetitive behavior. Although the mechanisms underlying its etiology and manifestations are poorly understood, several lines of evidence from rodent and human studies suggest involvement of the evolutionarily highly-conserved oxytocin (OXT) and arginine-vasopressin (AVP), as these neuropeptides modulate various aspects of mammalian social behavior. As far as we know, there is no comprehensive review of the roles of the OXT and AVP systems in the development of ASD from the genetic aspect...
April 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28280053/copeptin-associates-with-cause-specific-mortality-in-patients-with-impaired-renal-function-results-from-the-luric-and-the-4d-study
#8
Vera Krane, Bernd Genser, Marcus E Kleber, Christiane Drechsler, Winfried März, Graciela Delgado, Bruno Allolio, Christoph Wanner, Wiebke Fenske
BACKGROUND: In chronic kidney disease (CKD) arginine vasopressin (AVP) cannot efficiently act via renal V2-receptors. AVP is upregulated leading to augmented activation of V1a- and V1b-receptors, which might contribute to the increase in cardiovascular and infectious complications in CKD. Here, we evaluate copeptin, a surrogate of AVP, and its association with cause specific mortality among patients within the whole spectrum of renal function. METHODS: Copeptin was measured in baseline samples from the LURIC (n = 3131 patients with coronary angiograms) and the 4D-Study (n = 1241 type 2 diabetic hemodialysis patients)...
March 9, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28279755/purinergic-p2-receptors-in-the-paraventricular-nucleus-of-the-hypothalamus-are-involved-in-hyperosmotic-induced-sympathoexcitation
#9
H C Ferreira-Neto, I M R Ribeiro, T S Moreira, S T Yao, V R Antunes
Increases in plasma osmolality activates the paraventricular nucleus of the hypothalamus (PVN) which in turn mounts a physiological response by increasing the release of arginine vasopressin and sympathetic nerve activity to end organs such as the kidney. The PVN expresses an abundance of purinergic receptors including P2X2 receptors. In the present study, we sought to determine 1) whether P2X2-expressing PVN neurons are activated by hypertonic saline or hypertonic mannitol and 2) what effects P2X receptor blockade has on sympathetic nerve activation mediated by a hyperosmotic stimulus...
March 6, 2017: Neuroscience
https://www.readbyqxmd.com/read/28267585/disturbances-of-thirst-and-fluid-balance-associated-with-aging
#10
REVIEW
Denovan P Begg
During heat waves, significant mortality and morbidity occurs in elderly populations due to heat-stress and dehydration. The dehydration is primarily attributable to inadequate water intake caused by dysfunction of the central nervous system mechanisms controlling thirst. The phenomenon of a reduced thirst in response to dehydration in aging was first observed decades ago and has been examined extensively since. The reduced thirst and ingestive behavior have been reported consistently in response to hyperosmotic stimuli, hypovolemic stimuli and dehydration in both elderly humans and animal models of aging...
March 3, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28261089/sex-and-age-differences-in-motion-sickness-in-rats-the-correlation-with-blood-hormone-responses-and-neuronal-activation-in-the-vestibular-and-autonomic-nuclei
#11
Wei Zhou, Junqin Wang, Leilei Pan, Ruirui Qi, Peng Liu, Jiluo Liu, Yiling Cai
Many studies have demonstrated sex and age differences in motion sickness, but the underlying physiological basis is still in controversy. In the present study, we tried to investigate the potential correlates of endocrine and/or neuronal activity with sex and age differences in rats with motion sickness. LiCl-induced nausea symptom was evaluated by conditioned gaping. Motion sickness was assessed by measurement of autonomic responses (i.e., conditioned gaping and defecation responses), motor impairments (i...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28258508/a-volumetric-and-functional-connectivity-mri-study-of-brain-arginine-vasopressin-pathways-in-autistic-children
#12
Xiao-Jing Shou, Xin-Jie Xu, Xiang-Zhu Zeng, Ying Liu, Hui-Shu Yuan, Yan Xing, Mei-Xiang Jia, Qing-Yun Wei, Song-Ping Han, Rong Zhang, Ji-Sheng Han
Dysfunction of brain-derived arginine-vasopressin (AVP) systems may be involved in the etiology of autism spectrum disorder (ASD). Certain regions such as the hypothalamus, amygdala, and hippocampus are known to contain either AVP neurons or terminals and may play an important role in regulating complex social behaviors. The present study was designed to investigate the concomitant changes in autistic behaviors, circulating AVP levels, and the structure and functional connectivity (FC) of specific brain regions in autistic children compared with typically developing children (TDC) aged from 3 to 5 years...
April 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28242105/an-immunohistochemical-study-on-the-distribution-of-vasotocin-neurons-in-the-brain-of-two-weakly-electric-fish-gymnotus-omarorum-and-brachyhypopomus-gauderio
#13
Paula Pouso, Milka Radmilovich, Ana Silva
Hypothalamic nonapeptides (arginin vasotocin-vasopressin, oxytocin-isotocin) are known to modulate social behaviors across vertebrates. The neuroanatomical conservation of nonapeptide systems enables the use of novel vertebrate model species to identify general strategies of their functional mechanisms. We present a detailed immunohistochemical description of vasotocin (AVT) cell populations and their projections in two species of weakly electric fish with different social structure, Gymnotus omarorum and Brachyhypopomus gauderio...
February 16, 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28239333/postnatal-light-effects-on-pup-stress-axis-development-are-independent-of-maternal-behavior
#14
Georgia Coleman, Maria M Canal
Postnatal environment shapes brain development during key critical periods. We have recently found that postnatal light environment has long-term effects on the stress and circadian systems, which can lead to altered stress responses, circadian behavior and a depressive phenotype in adulthood. However, it is still unclear how light experience affects the postnatal development of specific stress markers in the pup brain and the role played by maternal behavior and stress. To test this, we raised mice under either light-dark cycles (LD), constant light (LL) or constant darkness (DD) during the suckling stage...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28224417/neuroanatomical-circuitry-between-kidney-and-rostral-elements-of-brain-a-virally-mediated-transsynaptic-tracing-study-in-mice
#15
Ye-Ting Zhou, Zhi-Gang He, Tao-Tao Liu, Mao-Hui Feng, Ding-Yu Zhang, Hong-Bing Xiang
The identity of higher-order neurons and circuits playing an associative role to control renal function is not well understood. We identified specific neural populations of rostral elements of brain regions that project multisynaptically to the kidneys in 3-6 days after injecting a retrograde tracer pseudorabies virus (PRV)-614 into kidney of 13 adult male C57BL/6J strain mice. PRV-614 infected neurons were detected in a number of mesencephalic (e.g. central amygdala nucleus), telencephalic regions and motor cortex...
February 2017: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/28223322/eta-receptors-blockade-by-activating-etb-receptors-increases-vascular-permeability-and-induces-exaggerated-fluid-retention
#16
Magali Vercauteren, Frederic Trensz, Anne Pasquali, Christophe Cattaneo, Daniel S Strasser, Patrick Hess, Marc Iglarz, Martine Clozel
Endothelin receptor antagonists have been associated with fluid retention. It has been suggested that, of the two endothelin receptor subtypes, ETB receptors should not be blocked, because of their involvement in natriuresis and diuresis. Surprisingly, clinical data suggest that ETA-selective antagonists pose a greater risk of fluid overload than dual antagonists. The purpose of this study was to evaluate the contribution of each endothelin receptor to fluid retention and vascular permeability in rats. Sitaxentan and ambrisentan as ETA-selective antagonists, bosentan and macitentan as dual antagonists were used as representatives of each class, respectively...
February 21, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28219987/a-unique-angiotensin-sensitive-neuronal-population-coordinates-neuroendocrine-cardiovascular-and-behavioral-responses-to-stress
#17
Annette D de Kloet, Lei Wang, Soledad Pitra, Helmut Hiller, Justin A Smith, Yalun Tan, Dani Nguyen, Karlena M Cahill, Colin Sumners, Javier E Stern, Eric G Krause
Stress elicits neuroendocrine, autonomic and behavioral responses that mitigate homeostatic imbalance and ensure survival; however, chronic engagement of such responses promotes psychological, cardiovascular and metabolic impairments. Over recent years, the renin-angiotensin system has emerged as a key mediator of stress responding and its related pathologies, but the neuronal circuits that orchestrate these interactions are not known. These studies combine the use of the Cre-recombinase/loxP system in mice with optogenetics to structurally and functionally characterize angiotensin type-1a receptor-containing neurons of the paraventricular nucleus of the hypothalamus, the goal being to determine the extent of their involvement in the regulation of stress responses...
February 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28218410/pharmacokinetics-and-pharmacodynamics-of-tolvaptan-in-autosomal-dominant-polycystic-kidney-disease-phase-2-trials-for-dose-selection-in-the-pivotal-phase-3-trial
#18
Susan E Shoaf, Arlene B Chapman, Vicente E Torres, John Ouyang, Frank S Czerwiec
In the pivotal TEMPO 3:4 trial, the arginine vasopressin V2-receptor antagonist tolvaptan reduced the rate of kidney growth in patients with autosomal dominant polycystic kidney disease. Tolvaptan was initiated as daily morning/afternoon doses of 45/15 mg, and uptitrated weekly to 60/30 mg and 90/30 mg according to patient-reported tolerability. The current report describes 3 phase 2 trials in adult autosomal dominant polycystic kidney disease subjects that were the basis for the titrated split-dose regimen: a single ascending-dose trial (tolvaptan 15 to 120 mg; n = 11), a multiple split-dose trial (tolvaptan 15/15 mg, 30/0 mg, 30/15 mg, and 30/30 mg; n = 37), and an 8-week open-label safety and efficacy trial in 46 of the 48 subjects who participated in the prior 2 trials (tolvaptan 30/15 mg, 45/15 mg, 60/30 mg, and 90/30 mg)...
February 20, 2017: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28210214/arginine-vasopressin-alters-both-spontaneous-and-phase-locked-synaptic-inputs-to-airway-vagal-preganglionic-neuron-via-activation-of-v1a-receptor-insights-into-stress-related-airway-vagal-excitation
#19
Xianxia Yan, Xingxin Chen, Yuhong Guo, Ding He, Yonghua Chen, Chunmei Xia, Jijiang Wang
The airway vagal preganglionic neurons (AVPNs) in the external formation of the nucleus ambiguus (eNA) play a major role in the vagal control of tracheobronchial smooth muscle tone and maintenance of airway resistance. The eNA receives vasopressinergic projection from the hypothalamic paraventricular nucleus (PVN), the key node for the genesis of psychological stress. Since airway vagal excitation is reportedly to be associated with the psychological stress-induced/exacerbated airway hyperresponsiveness in asthmatics, arginine vasopressin (AVP) might be involved in stress-related airway vagal excitation...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28194574/tolvaptan-treatment-for-severe-neonatal-autosomal-dominant-polycystic-kidney-disease
#20
Rodney D Gilbert, Hazel Evans, Kazeem Olalekan, Arvind Nagra, Mushfequr R Haq, Mark Griffiths
BACKGROUND: Severe neonatal autosomal-dominant polycystic kidney disease (ADPKD) is rare and easily confused with recessive PKD. Managing such infants is difficult and often unsuccessful. CASE DIAGNOSIS/TREATMENT: A female infant with massive renal enlargement, respiratory compromise and hyponatraemia was treated with the arginine vasopressin receptor 2 antagonist tolvaptan. This resolved hyponatraemia, and there was no further increase in renal size. CONCLUSION: Tolvaptan may be a useful treatment for severe neonatal PKD...
February 13, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
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