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https://www.readbyqxmd.com/read/29328496/hypotension-risk-based-on-vasoactive-agent-discontinuation-order-in-patients-in-the-recovery-phase-of-septic-shock
#1
Gretchen L Sacha, Simon W Lam, Abhijit Duggal, Heather Torbic, Anita J Reddy, Seth R Bauer
STUDY OBJECTIVES: Patients with septic shock often require vasoactive agents for hemodynamic support; however, the optimal approach to discontinuing these agents once patients reach the recovery phase is currently unknown. The objective of this evaluation was to compare the incidence of hypotension within 24 hours based on the discontinuation order of norepinephrine (NE) and vasopressin (AVP) in patients in the recovery phase of septic shock. DESIGN: Retrospective cohort study...
January 12, 2018: Pharmacotherapy
https://www.readbyqxmd.com/read/29325449/analysis-of-dna-methylation-in-young-people-limited-evidence-for-an-association-between-victimization-stress-and-epigenetic-variation-in-blood
#2
Sarah J Marzi, Karen Sugden, Louise Arseneault, Daniel W Belsky, Joe Burrage, David L Corcoran, Andrea Danese, Helen L Fisher, Eilis Hannon, Terrie E Moffitt, Candice L Odgers, Carmine Pariante, Richie Poulton, Benjamin S Williams, Chloe C Y Wong, Jonathan Mill, Avshalom Caspi
OBJECTIVE: DNA methylation has been proposed as an epigenetic mechanism by which early-life experiences become "embedded" in the genome and alter transcriptional processes to compromise health. The authors sought to investigate whether early-life victimization stress is associated with genome-wide DNA methylation. METHOD: The authors tested the hypothesis that victimization is associated with DNA methylation in the Environmental Risk (E-Risk) Longitudinal Study, a nationally representative 1994-1995 birth cohort of 2,232 twins born in England and Wales and assessed at ages 5, 7, 10, 12, and 18 years...
January 12, 2018: American Journal of Psychiatry
https://www.readbyqxmd.com/read/29306965/differential-activation-of-arginine-vasopressin-receptor-subtypes-in-the-amygdaloid-modulation-of-anxiety-in-the-rat-by-arginine-vasopressin
#3
Oscar René Hernández-Pérez, Minerva Crespo-Ramírez, Yordanka Cuza-Ferrer, José Anias-Calderón, Limei Zhang, Gabriel Roldan-Roldan, Raúl Aguilar-Roblero, Dasiel O Borroto-Escuela, Kjell Fuxe, Miguel Perez de la Mora
RATIONALE: The amygdala plays a paramount role in the modulation of anxiety and numerous studies have shown that arginine vasopressin (AVP) elicits anxiogenic effects following either its systemic or septal administration. OBJECTIVES: The aim of this paper was to study the involvement of vasopressinergic neurotransmission in the amygdaloid modulation of unconditioned anxiety and to ascertain whether or not AVP receptor subtypes may have a differential role in this modulation...
January 7, 2018: Psychopharmacology
https://www.readbyqxmd.com/read/29302194/in-vitro-binding-and-receptor-mediated-activity-of-terlipressin-at-vasopressin-receptors-v1-and-v2
#4
Khurram Jamil, Stephen Chris Pappas, Krishna R Devarakonda
Terlipressin, a synthetic, systemic vasoconstrictor with selective activity at vasopressin-1 (V1) receptors, is a pro-drug for the endogenous/natural porcine hormone [Lys8]-vasopressin (LVP). We investigated binding and receptor-mediated cellular activities of terlipressin, LVP, and endogenous human hormone [Arg8]-vasopressin (AVP) at V1 and vasopressin-2 (V2) receptors. Cell membrane homogenates of Chinese hamster ovary cells expressing human V1 and V2 receptors were used in competitive binding assays to measure receptor-binding activity...
2018: Journal of Experimental Pharmacology
https://www.readbyqxmd.com/read/29251736/pge2-ep1-receptor-inhibits-vasopressin-dependent-water-reabsorption-and-sodium-transport-in-mouse-collecting-duct
#5
Rania Nasrallah, Joseph Zimpelmann, David Eckert, Jamie Ghossein, Sean Geddes, Jean-Claude Beique, Jean-Francois Thibodeau, Chris R J Kennedy, Kevin D Burns, Richard L Hébert
PGE2 regulates glomerular hemodynamics, renin secretion, and tubular transport. This study examined the contribution of PGE2 EP1 receptors to sodium and water homeostasis. Male EP1-/- mice were bred with hypertensive TTRhRen mice (Htn) to evaluate blood pressure and kidney function at 8 weeks of age in four groups: wildtype (WT), EP1-/-, Htn, HtnEP1-/-. Blood pressure and water balance were unaffected by EP1 deletion. COX1 and mPGE2 synthase were increased and COX2 was decreased in mice lacking EP1, with increases in EP3 and reductions in EP2 and EP4 mRNA throughout the nephron...
December 18, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/29249943/the-suprachiasmatic-nucleus-of-the-dromedary-camel-camelus-dromedarius-cytoarchitecture-and-neurochemical-anatomy
#6
Khalid El Allali, Mohamed R Achaâban, Mohammed Piro, Mohammed Ouassat, Etienne Challet, Mohammed Errami, Nouria Lakhdar-Ghazal, André Calas, Paul Pévet
In mammals, biological rhythms are driven by a master circadian clock located in the suprachiasmatic nucleus (SCN) of the hypothalamus. Recently, we have demonstrated that in the camel, the daily cycle of environmental temperature is able to entrain the master clock. This raises several questions about the structure and function of the SCN in this species. The current work is the first neuroanatomical investigation of the camel SCN. We carried out a cartography and cytoarchitectural study of the nucleus and then studied its cell types and chemical neuroanatomy...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29249934/the-psychoactive-agent-crocin-can-regulate-hypothalamic-pituitary-adrenal-axis-activity
#7
Sara Asalgoo, Mahdi Tat, Hedayat Sahraei, Gila Pirzad Jahromi
Post-traumatic stress disorder (PTSD) occurs following life-threatening events. The activity of the hypothalamic-pituitary-adrenal (HPA) axis, which serves as the first line of defense against stress, is dysfunctional in this disorder. The current study aimed to investigate the role of Crocin in normalizing HPA function in an animal model of PTSD induced by electric foot shock. Rats were treated with Crocin 5 min prior to stress induction. The stimulus was re-introduced after 21 days, and we measured individual behaviors such as sniffing, rearing, grooming, and freezing...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29241593/rapid-differential-diagnosis-of-diabetes-insipidus-in-a-7-month-old-infant-the-copeptin-approach
#8
J Vergier, J Fromonot, A Alvares De Azevedo Macedo, A Godefroy, E Marquant, R Guieu, M Tsimaratos, R Reynaud
INTRODUCTION: Diabetes insipidus is characterized by hypoosmotic polyuria related to deficiency of arginine-vasopressin (AVP) secretion (central diabetes insipidus, CDI) or renal insensitivity to AVP (nephrogenic diabetes insipidus, NDI). The water deprivation test with assessment of AVP activity is currently the gold standard for differential diagnosis in patients presenting polyuria-polydipsia syndrome. Nevertheless, it can be dangerous without proper surveillance and its interpretation may be challenging...
January 2018: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/29235050/copeptin-and-insulin-resistance-effect-modification-by-age-and-11-%C3%AE-hsd2-activity-in-a-population-based-study
#9
S Canivell, M Mohaupt, D Ackermann, M Pruijm, I Guessous, G Ehret, G Escher, A Pechère-Bertschi, B Vogt, O Devuyst, M Burnier, P-Y Martin, B Ponte, M Bochud
PURPOSE: Arginine vasopressin (AVP) may be involved in metabolic syndrome (MetS) by altering liver glycogenolysis, insulin and glucagon secretion, and pituitary ACTH release. Moreover, AVP stimulates the expression of 11β-hydroxysteroid-dehydrogenase-type 2 (11β-HSD2) in mineralocorticosteroid cells. We explored whether apparent 11β-HSD2 activity, estimated using urinary cortisol-to-cortisone ratio, modulates the association between plasma copeptin, as AVP surrogate, and insulin resistance/MetS in the general adult population...
December 12, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/29217107/the-underlying-physiological-basis-of-the-desert-rodent-meriones-shawi-s-survival-to-prolonged-water-deprivation-central-vasopressin-regulation-on-peripheral-kidney-water-channels-aqps-2
#10
A Elgot, O El Hiba, M Belkouch, H Gamrani
Meriones shawi (M. shawi) is a particular semi-desert rodent known by its resistance to long periods of thirst. The aim of the present investigation is to clarify the underlying mechanisms allowing M. shawi to resist to hard conditions of dehydration. For this reason we used two different approaches: i) a morphometric study, which consists in measuring the effect of dehydration on body and kidneys weights as well as the report kidney weight/body weight, ii) By immunohistochemistry, we proceed to study the effect of dehydration on the immunoreactivity of central vasopressin (AVP) and the kidney aquaporin-2 (AQP-2) which is a channel protein that allows water to permeate across cell membranes...
December 4, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/29216295/alpha-1-antichymotrypsin-is-involved-in-astrocyte-injury-in-concert-with-arginine-vasopressin-during-the-development-of-acute-hepatic-encephalopathy
#11
Jonghyuk Park, Takahiro Masaki, Yoshihiro Mezaki, Hiroshi Yokoyama, Mariko Nakamura, Haruka Maehashi, Takahiko J Fujimi, Sabine S Gouraud, Keisuke Nagatsuma, Madoka Nakagomi, Naofumi Kimura, Tomokazu Matsuura
BACKGROUND AND AIMS: We developed a bio-artificial liver (BAL) using a radial-flow bioreactor and rescued mini-pig models with lethal acute liver failure (ALF). The point of the rescue is the recovery from hepatic encephalopathy (HE). HE on ALF has sometimes resulted in brain death following brain edema with astrocyte swelling. Several factors, including ammonia and glutamine, have been reported to induce astrocyte swelling and injury. However, many clinicians believe that there are any other factors involved in the development of HE...
2017: PloS One
https://www.readbyqxmd.com/read/29212780/excitatory-gabaergic-action-and-increased-vasopressin-synthesis-in-hypothalamic-magnocellular-neurosecretory-cells-underlie-the-high-plasma-level-of-vasopressin-in-diabetic-rat
#12
Young-Beom Kim, Woong Bin Kim, Won Woo Jung, Xiangyan Jin, Yoon Sik Kim, Byoungjae Kim, Hee Chul Han, Gene D Block, Christopher S Colwell, Yang In Kim
Diabetes mellitus (DM) is associated with increased plasma levels of arginine-vasopressin (AVP) which may aggravate hyperglycemia and nephropathy. However, the mechanisms by which DM may cause the increased AVP levels are not known. Electrophysiological recordings in the supraoptic nucleus (SON) slices from streptozotocin-induced DM model (STZ) rats and vehicle-treated control rats revealed that GABA functions generally as an excitatory neurotransmitter in the AVP neurons of STZ rats, whereas it evoked usually inhibitory responses in the cells of control animals...
December 6, 2017: Diabetes
https://www.readbyqxmd.com/read/29196219/diet-induced-insulin-resistance-state-disturbs-brain-clock-processes-and-alters-tuning-of-clock-outputs-in-the-sand-rat-psammomys-obesus
#13
Hanane Touati, Saliha Ouali-Hassenaoui, Aicha Dekar-Madoui, Etienne Challet, Paul Pévet, Patrick Vuillez
Reciprocal interactions closely connect energy metabolism with circadian rhythmicity. Altered clockwork and circadian desynchronization are often linked with impaired energy regulation. Conversely, metabolic disturbances have been associated with altered autonomic and hormonal rhythms. The effects of high-energy (HE) diet on the master clock in the suprachiasmatic nuclei (SCN) remain unclear.This question was addressed in the Sand rat (Psammomys obesus), a non-insulin-dependent diabetes mellitus (NIDDM) animal model...
November 28, 2017: Brain Research
https://www.readbyqxmd.com/read/29187641/vasopressin-stimulates-the-proliferation-and-differentiation-of-red-blood-cell-precursors-and-improves-recovery-from-anemia
#14
Balázs Mayer, Krisztián Németh, Miklós Krepuska, Vamsee D Myneni, Dragan Maric, John F Tisdale, Matthew M Hsieh, Naoya Uchida, Heon-Jin Lee, Michael J Nemeth, Kenn Holmbeck, Constance Tom Noguchi, Heather Rogers, Soumyadeep Dey, Arne Hansen, Jeffrey Hong, Ian Chow, Sharon Key, Ildikó Szalayova, Jerome Pagani, Károly Markó, Ian McClain-Caldwell, Lynn Vitale-Cross, W Scott Young, Michael J Brownstein, Éva Mezey
Arginine vasopressin (AVP) made by hypothalamic neurons is released into the circulation to stimulate water resorption by the kidneys and restore water balance after blood loss. Patients who lack this antidiuretic hormone suffer from central diabetes insipidus. We observed that many of these patients were anemic and asked whether AVP might play a role in red blood cell (RBC) production. We found that all three AVP receptors are expressed in human and mouse hematopoietic stem and progenitor cells. The AVPR1B appears to play the most important role in regulating erythropoiesis in both human and mouse cells...
November 29, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29186911/prostaglandin-e2-in-the-regulation-of-water-transport-in-renal-collecting-ducts
#15
REVIEW
Yuyuan Li, Yuanyi Wei, Feng Zheng, Youfei Guan, Xiaoyan Zhang
The kidney plays a central role in the regulation of the body water balance. The process of targeting the water channel aquaporin-2 (AQP2) on the apical plasma membrane of the collecting duct (CD) principal cells is mainly regulated by the antidiuretic peptide hormone arginine vasopressin (AVP), which is responsible for the maintenance of water homeostasis. Recently, much attention has been focused on the local factors modulating renal water reabsorption by AQP2 in the collecting ducts, especially prostaglandin E2 (PGE₂)...
November 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29184535/sex-differences-in-the-regulation-of-offensive-aggression-and-dominance-by-arginine-vasopressin
#16
REVIEW
Joseph I Terranova, Craig F Ferris, H Elliott Albers
Arginine-vasopressin (AVP) plays a critical role in the regulation of offensive aggression and social status in mammals. AVP is found in an extensive neural network in the brain. Here, we discuss the role of AVP in the regulation of aggression in the limbic system with an emphasis on the critical role of hypothalamic AVP in the control of aggression. In males, activation of AVP V1a receptors (V1aRs) in the hypothalamus stimulates offensive aggression, while in females activation of V1aRs inhibits aggression...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29183825/chronic-intranasal-oxytocin-has-dose-dependent-effects-on-central-oxytocin-and-vasopressin-systems-in-prairie-voles-microtus-ochrogaster
#17
C D Guoynes, T C Simmons, G M Downing, S Jacob, M Solomon, K L Bales
Oxytocin (Oxt) is a neuropeptide with many functions, including modulation of social behavior(s) and anxiety. Due to its notable pro-social effects, it has been proposed as a treatment in the management of neuropsychiatric disorders, such as autism spectrum disorder (ASD), schizophrenia, and social anxiety; however, effects of long-term daily treatment are still being explored. Previously, we have shown that in male prairie voles (Microtus ochrogaster) exposure to Oxt during the peri-adolescent period impaired adult pair bonding in a dose-dependent fashion...
November 25, 2017: Neuroscience
https://www.readbyqxmd.com/read/29176061/exhaled-breath-temperature-in-optimally-treated-asthmatics-severity-and-underlying-mechanisms
#18
Polyxeni Ntontsi, Petros Bakakos, Evgenia Papathanasiou, Zoi Tsilogianni, Konstantinos Kostikas, Georgios Hillas, Georgios Papatheodorou, Nikolaos G Koulouris, Spyridon Papiris, Stelios Loukides
ABSTRACT Introduction: Increased vascularity may lead to loss of heat in the airways and may modulate Exhaled breath temperature (EBT). Increased EBT has been associated with uncontrolled asthma. Aim: We wanted to determine whether the measurement of EBT in optimally treated asthmatic patients is influenced by the increased vascular permeability and whether Vascular endothelial growth factor (VEGF) is implicated in the above process. Furthermore, to assess the impact of asthma severity on EBT values...
November 27, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/29155265/neuroanatomical-distribution-and-function-of-the-vasopressin-v1b-receptor-in-the-rat-brain-deciphered-using-specific-fluorescent-ligands
#19
Maithé Corbani, Rafik Marir, Miguel Trueba, Magda Chafai, Anne Vincent, Amélie M Borie, Michel G Desarménien, Yoichi Ueta, Csaba Tomboly, Aleksandra Olma, Maurice Manning, Gilles Guillon
It is now accepted that vasopressin, through V1A/V1B receptors, centrally regulates cognitive functions such as memory, affiliation, stress, fear and depression. However, the respective roles of these receptor isoforms and their contribution to stress-related pathologies remain uncertain. The development of new therapeutic treatments requires a precise knowledge of the distribution of these receptors within the brain, which has been so far hampered by the lack of selective V1B markers. In the present study, we have determined the pharmacological properties of three new potent rat V1B fluorescent ligands and demonstrated that they constitute valuable tools for simultaneous visualization and activation of native V1B receptors in living rat brain tissue...
November 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29146932/activation-of-endogenous-arginine-vasopressin-neurons-inhibit-food-intake-by-using-a-novel-transgenic-rat-line-with-dreadds-system
#20
Mitsuhiro Yoshimura, Kazuaki Nishimura, Haruki Nishimura, Satomi Sonoda, Hiromichi Ueno, Yasuhito Motojima, Reiko Saito, Takashi Maruyama, Yuki Nonaka, Yoichi Ueta
Various studies contributed to discover novel mechanisms of central arginine vasopressin (AVP) system responsible for the behaviour albeit endogenous vasopressin activation. We established a novel transgenic rat line which expresses both human muscarinic acetylcholine receptors (hM3Dq), of which ligand is clozapine-N-oxide (CNO), and mCherry fluorescence specifically in AVP neurons. The mCherry neurons that indicate the expression of the hM3Dq gene were observed in the suprachiasmatic (SCN), supraoptic (SON), and paraventricular nuclei (PVN)...
November 16, 2017: Scientific Reports
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