RESUMEN
BACKGROUND: Myelomeningocele (MMC) is a neural tube defect disease. Antenatal repair of fetal MMC is an alternative to postnatal repair. Many agents can be used as tocolytics during the in utero fetal repair such as ß2-agonists and oxytocin receptor antagonists, with possible maternal and fetal repercussions. This study aims to compare maternal arterial blood gas analysis between terbutaline or atosiban, as tocolytic agents, during intrauterine MMC repair. METHODS: Retrospective cohort study. Patients were divided into two groups depending on the main tocolytic agent used during intrauterine MMC repair: atosiban (16) or terbutaline (9). Maternal arterial blood gas samples were analyzed on three moments: post induction (baseline, before the start of tocolysis), before extubation, and two hours after the end of the surgery. RESULTS: Twenty-five patients were included and assessed. Before extubation, the terbutaline group showed lower arterial pH (7.347 ± 0.05 vs. 7.396 ± 0.02 for atosiban, p = 0.006) and higher arterial lactate (28.33 ± 12.76 mg.dL-1 vs. 13.06 ± 6.35 mg.dL-1, for atosiban, p = 0.001) levels. CONCLUSIONS: Patients who received terbutaline had more acidosis and higher levels of lactate, compared to those who received atosiban, during intrauterine fetal MMC repair.
Asunto(s)
Meningomielocele , Terbutalina , Tocolíticos , Vasotocina , Humanos , Estudios Retrospectivos , Terbutalina/uso terapéutico , Terbutalina/administración & dosificación , Femenino , Meningomielocele/cirugía , Adulto , Tocolíticos/administración & dosificación , Embarazo , Vasotocina/análogos & derivados , Vasotocina/uso terapéutico , Estudios de Cohortes , Análisis de los Gases de la SangreRESUMEN
The establishment of the dominant-subordinate status implies a clear behavioral asymmetry between contenders that arises immediately after the resolution of the agonistic encounter and persists during the maintenance of stable dominance hierarchies. Changes in the activity of the brain social behavior network (SBN) are postulated to be responsible for the establishment and maintenance of the dominant-subordinate status. The hypothalamic nonapeptides of the vasopressin (AVP) and oxytocin (OT) families are known to modulate the activity of the SBN in a context-dependent manner across vertebrates, including status-dependent modulations. We searched for status-dependent asymmetries in AVP-like (vasotocin, AVT) and OT-like (isotocin, IT) cell number and activation immediately after the establishment of dominance in males of the weakly electric fish, Gymnotus omarorum, which displays the best understood example of non-breeding territorial aggression among teleosts. We used immunolabeling (FOS, AVT, and IT) of preoptic area (POA) neurons after dyadic agonistic encounters. This study is among the first to show in teleosts that AVT, but not IT, is involved in the establishment of the dominant-subordinate status. We also found status-dependent subregion-specific changes of AVT cell number and activation. These results confirm the involvement of AVT in the establishment of dominance and support the speculation that AVT is released from dominants' AVT neurons.
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Pez Eléctrico , Vasotocina , Humanos , Masculino , Animales , Pez Eléctrico/fisiología , Oxitocina , AgresiónRESUMEN
OBJECTIVE: To estimate the effectiveness of Atosiban in improving the outcome after embryo transfer. The effectiveness of embryo transfer per cycle is still relatively low. One possible explanation might be uterine contractility that expels the transferred embryos. Atosiban improved the outcome of embryo transfer by reducing uterine contractility. METHODS: Data sources: A systematic review of papers in English using MEDLINE and EMBASE (1990-2019). Search terms included Atosiban, embryo transfer. Study selection: We included studies that compared the outcomes of embryo transfer with Atosiban and a control group. Data Extracting: Independent extraction of papers by two authors, using predefined data fields, including study quality indicators. RESULTS: All pooled analyses were based on a fixed-effect model. Four randomised controlled trials, including 1,025 women, and two non-randomised trials, including 686 patients, met our inclusion criteria. In both studies, the heterogeneity was moderate. Atosiban increased clinical pregnancy rates regardless of the indication for ART or type of embryo transferred. Pooled OR in randomized controlled trials reached 1.47 (1.18-1.82), and in non-randomised controlled trials it reached 1.50 (95% CI 1.10-2.05). CONCLUSION: Atosiban appears to increase the clinical pregnancy rates in women undergoing embryo transfer.
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Transferencia de Embrión/métodos , Fertilización In Vitro/métodos , Antagonistas de Hormonas/administración & dosificación , Vasotocina/análogos & derivados , Ensayos Clínicos como Asunto , Femenino , Humanos , Embarazo , Índice de Embarazo , Vasotocina/administración & dosificaciónRESUMEN
INTRODUCTION AND OBJECTIVES: Oxytocin (OT) has been widely linked to positive social interactions, and there is great interest in OT as a therapy for a variety of neuropsychiatric conditions. Recent evidence also suggests that OT can play an important role in the mediation of anxiety-associated defensive responses, including a role for serotonin (5-HT) neurotransmission in this action. However, it is presently unknown whether OT additionally regulates the expression of panic-related behaviors, such as escape, by acting in the dorsal periaqueductal gray (dPAG), a key panic-regulating area. This study aimed to investigate the consequence of OT injection in the dPAG on escape expression and whether facilitation of 5-HT neurotransmission in this midbrain area is implicated in this action. METHODS: Male Wistar rats were injected with OT in the dPAG and tested for escape expression in the elevated T-maze (ETM) and dPAG electrical stimulation tests. Using the latter test, OT's effect was also investigated after previous intra-dPAG injection of the OT receptor antagonist atosiban, the preferential antagonists of 5-HT1A and 5-HT2A receptors, WAY-100635 and ketanserin, respectively, or systemic pretreatment with the 5-HT synthesis inhibitor p-CPA. RESULTS: OT impaired escape expression in the two tests used, suggesting a panicolytic-like effect. In the ETM, the peptide also facilitated inhibitory avoidance acquisition, indicating an anxiogenic effect. Previous administration of atosiban, WAY-100635, ketanserin, or p-CPA counteracted OT's anti-escape effect. CONCLUSIONS: OT and 5-HT in the dPAG interact in the regulation of panic- and anxiety-related defensive responses. These findings open new perspectives for the development of novel therapeutic strategies for the treatment of anxiety disorders.
Asunto(s)
Ansiolíticos/farmacología , Oxitocina/farmacología , Pánico/efectos de los fármacos , Sustancia Gris Periacueductal/efectos de los fármacos , Serotonina/fisiología , Animales , Conducta Animal/efectos de los fármacos , Estimulación Eléctrica , Electrodos Implantados , Reacción de Fuga/efectos de los fármacos , Masculino , Ratas , Ratas Wistar , Receptor de Serotonina 5-HT1A/efectos de los fármacos , Receptor de Serotonina 5-HT2A/efectos de los fármacos , Receptores de Oxitocina/antagonistas & inhibidores , Antagonistas de la Serotonina/farmacología , Transmisión Sináptica/efectos de los fármacos , Transmisión Sináptica/fisiología , Vasotocina/análogos & derivados , Vasotocina/farmacologíaRESUMEN
South American weakly electric fish (order Gymnotiformes) rely on a highly conserved and relatively fixed electromotor circuit to produce species-specific electric organ discharges (EODs) and a variety of meaningful adaptive EOD modulations. The command for each EOD arises from a medullary pacemaker nucleus composed of electrotonically coupled intrinsic pacemaker and bulbospinal projecting relay cells. During agonistic encounters, Gymnotus omarorum signals submission by interrupting its EOD (offs) and emitting transient high-rate barrages of low-amplitude discharges (chirps). Previous studies in Gymnotiformes have shown that electric signal diversity is based on the segregation of descending synaptic inputs to pacemaker or relay cells and differential activation of the neurotransmitter receptors -for glutamate or γ-aminobutyric acid (GABA) - of these cells. Therefore, we tested whether GABAergic and glutamatergic inputs to pacemaker nucleus neurons are involved in the emission of submissive electric signals in G. omarorum We found that GABA applied to pacemaker cells evokes EOD interruptions that closely resemble natural offs. Although in other species chirping is probably due to glutamatergic suprathreshold depolarization of relay cells, here, application of glutamate to these cells was unable to replicate the emission of this submissive signal. Nevertheless, chirp-like discharges were emitted after the enhancement of excitability of relay cells by blocking an IA-type potassium current and, in some cases, by application of vasotocin, a status-dependent modulator peptide of G. omarorum agonistic behavior. Modulation of the electrophysiological properties of pacemaker nucleus neurons in Gymnotiformes emerges as a novel putative mechanism endowing electromotor networks with higher functional versatility.
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Comunicación Animal , Órgano Eléctrico/fisiología , Gymnotiformes/fisiología , Conducta Agonística/fisiología , Animales , Relojes Biológicos/fisiología , Órgano Eléctrico/efectos de los fármacos , Fenómenos Electrofisiológicos , Femenino , Ácido Glutámico/farmacología , Masculino , Neuronas/fisiología , Receptores de Neurotransmisores/fisiología , Vasotocina/farmacología , Ácido gamma-Aminobutírico/farmacologíaRESUMEN
The hypothalamic neuropeptides of the vasopressin-oxytocin family (and their homologs for non-mammalian species) are key modulators of the Social Brain Network, acting via specific receptors reported in all the nuclei of this network. Different conclusive examples have proven the context-dependency actions of hypothalamic nonapeptides on social behavior in several vertebrate taxa. Teleost fishes provide endless possibilities of experimental model systems to explore the underlying mechanisms of nonapeptide actions on social behavior given that they are the most diverse group of vertebrates. Although it has been difficult to identify commonalities of nonapeptide actions across species, indisputable evidence in many teleost species have demonstrated a clear role of vasotocin in the modulation of aggressive and sexual behaviors. Though Neotropical South American fish contribute an important percentage of teleost diversity, most native species remain unexplored as model systems for the study of the neuroendocrine bases of social behavior. In this review, we will revise recent data on the two model systems of Neotropical fish, South American cichlids and weakly electric fish that have contributed to this issue.
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Conducta Agonística/efectos de los fármacos , Peces/fisiología , Vasotocina/farmacología , Animales , Modelos Biológicos , Sistemas Neurosecretores/metabolismo , Conducta SocialRESUMEN
LVV-hemorphin-7 (LVV-h7) is bioactive peptide resulting from degradation of hemoglobin ß-globin chain. LVV-h7 is a specific agonist of angiotensin IV receptor. This receptor belongs to the class of insulin-regulated aminopeptidases (IRAP), which displays oxytocinase activity. Herein, our aims were to assess whether: i) LVV-h7 modifies centrally organized behavior and cardiovascular responses to stress and ii) mechanisms underlying LVV-h7 effects involve activation of oxytocin (OT) receptors, probably as result of reduction of IRAP proteolytic activity upon OT. Adult male Wistar rats (270-370g) received (i.p.) injections of LVV-h7 (153nmol/kg), or vehicle (0.1ml). Different protocols were used: i) open field (OP) test for locomotor/exploratory activities; ii) Elevated Plus Maze (EPM) for anxiety-like behavior; iii) forced swimming test (FST) test for depression-like behavior and iv) air jet for cardiovascular reactivity to acute stress exposure. Diazepam (2mg/kg) and imipramine (15mg/kg) were used as positive control for EPM and FST, respectively. The antagonist of OT receptors (OTr), atosiban (1 and 0,1mg/kg), was used to determine the involvement of oxytocinergic paths. We found that LVV-h7: i) increased the number of entries and the time spent in open arms of the maze, an indicative of anxiolysis; ii) provoked antidepressant effect in the FS test; and iii) increased the exploration and locomotion; iv) did not change the cardiovascular reactivity and neuroendocrine responses to acute stress. Also, increases in locomotion and the antidepressant effects evoked by LVV-h7 were reverted by OTr antagonist. We conclude that LVV-h7 modulates behavior, displays antidepressant and anxiolytic effects that are mediated in part by oxytocin receptors.
Asunto(s)
Ansiolíticos/farmacología , Antidepresivos/farmacología , Conducta Animal/efectos de los fármacos , Hemoglobinas/farmacología , Actividad Motora/efectos de los fármacos , Fragmentos de Péptidos/farmacología , Receptores de Oxitocina/metabolismo , Animales , Ansiolíticos/uso terapéutico , Antidepresivos/uso terapéutico , Ansiedad/tratamiento farmacológico , Ansiedad/metabolismo , Depresión/tratamiento farmacológico , Depresión/metabolismo , Diazepam/farmacología , Hemoglobinas/uso terapéutico , Antagonistas de Hormonas/farmacología , Imipramina/farmacología , Masculino , Fragmentos de Péptidos/uso terapéutico , Ratas , Ratas Wistar , Receptores de Oxitocina/antagonistas & inhibidores , Vasotocina/análogos & derivados , Vasotocina/farmacologíaRESUMEN
AIM: Our aim was to investigate the effect of the prophylactic use of vaginal progesterone on the latency period from the initiation of tocolytic therapy to delivery in twin pregnancies with preterm labor. METHODS: This study was a secondary analysis of a randomized, double-blind, placebo-controlled trial of twin pregnancies in mothers who were exposed to a 200 mg vaginal progesterone ovule or a placebo ovule daily from 18 to 34 weeks gestation. Patients who were administered tocolysis with Atosiban because of preterm labor were included. The latency from tocolysis to delivery, mean gestational age at delivery and the rates of delivery within 48 h and within seven days were compared between progesterone and placebo groups. RESULTS: The analysis included 27 women in the progesterone group and 30 in the placebo group. The baseline characteristics were similar between the groups. Overall, there were no differences in the latency period to delivery (17.54 ± 13.54 days and 21.58 ± 13.52 days; P = 0.289), rates of delivery within 48 h (14.8% and 6.7%; P = 0.40) or within seven days (29.64% and 23.3%; P = 0.76) or mean gestational age at delivery (32.53 ± 3.33 and 34.13 ± 2.87; P = 0.08) between the progesterone and placebo groups, respectively. CONCLUSIONS: Prophylactic use of 200 mg of vaginal progesterone does not influence the latency to delivery in women with twin pregnancies treated with tocolysis because of preterm labor.
Asunto(s)
Trabajo de Parto Prematuro/tratamiento farmacológico , Evaluación de Resultado en la Atención de Salud , Embarazo Gemelar , Progesterona/farmacología , Tocólisis/métodos , Tocolíticos/farmacología , Administración Intravaginal , Adulto , Método Doble Ciego , Femenino , Humanos , Embarazo , Progesterona/administración & dosificación , Tocolíticos/administración & dosificación , Vasotocina/administración & dosificación , Vasotocina/análogos & derivados , Vasotocina/farmacología , Adulto JovenRESUMEN
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. Strong behavioral, pharmacological, and electrophysiological evidence support that AVT modulation of electric behavior differs between the gregarious B. gauderio and the solitary G. omarorum. This functional diversity does not necessarily depend on anatomical differences of AVT neurons. To test this, we focus on interspecific comparisons of the AVT system in basal non-breeding males along the brain. G. omarorum and B. gauderio showed similar AVT somata sizes and comparable distributions of AVT somata and fibers. Interestingly, AVT fibers project to areas related to the control of social behavior and electromotor displays in both species. We found that no gross anatomical differences in the organization of the AVT system account for functional differences between species, which rather shall depend on the pattern of activation of neurons embedded in the same basic anatomical organization of the AVT system.
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Pez Eléctrico/metabolismo , Hipotálamo/metabolismo , Neuronas/metabolismo , Vasotocina/metabolismo , Animales , Conducta Animal/fisiología , Pez Eléctrico/anatomía & histología , Pez Eléctrico/crecimiento & desarrollo , Jerarquia Social , Hipotálamo/anatomía & histología , Hipotálamo/crecimiento & desarrollo , MasculinoRESUMEN
Many pharmacological agents have been investigated to manage preterm labor; we postulate that a combination of tocolytic drugs may achieve a better effect in the prevention of uterine contractions without dose-dependent adverse effects. The aim of this study was to evaluate the inhibitory effect of dual combinations of tocolytics in vitro. Human myometrium was obtained during elective cesarean sections (term without labor; n = 40). Myometrial strips were placed in organ baths for the measurement of isometric tension. Contractile activity was induced by oxytocin (10-8 mol/L), then a concentration-response curve to single or dual combinations of tocolytics was started. All studied tocolytics (nifedipine, ritodrine, nitroglycerin, atosiban, and NS-1619), when used alone, significantly inhibited myometrial contractions. When combined, nifedipine plus ritodrine produced a significantly greater inhibition of contractility than each drug alone in the midrange of concentrations. The combination of nifedipine plus nitroglycerin or nifedipine plus atosiban produced a significantly greater inhibition than nitroglycerin or atosiban alone but not greater than nifedipine. The combination of nifedipine plus NS-1619 (Ca+2-activated K+ [BKCa] channel opener) reduced the inhibitory effect of each drug. We concluded that a selected combination of tocolytics (nifedipine plus ritodrine) produced a significantly greater inhibitory effect on contractility than each drug alone at intermediate concentrations. Thus, specific combinations of tocolytics with different intracellular signaling pathways may have a synergic effect constituting a provocative new option for preterm labor treatment.
Asunto(s)
Miometrio/efectos de los fármacos , Nifedipino/farmacología , Ritodrina/farmacología , Tocolíticos/farmacología , Contracción Uterina/efectos de los fármacos , Bencimidazoles/farmacología , Sinergismo Farmacológico , Femenino , Humanos , Embarazo , Vasotocina/análogos & derivados , Vasotocina/farmacologíaRESUMEN
Timing is crucial for social interactions. Animal behavior is synchronized with biotic and abiotic environment variables ensuring that the activity phase of conspecifics occurs during the same period of the day. As biological rhythms are embedded in the complex integrative control of the brain, it is fundamental to explore its interaction with environmental and social factors. This approach will unravel the link between external stimuli carrying information on environmental cycles and the neural commands for behavior, including social behavior, associated with precise phases of those cycles. Arousal in the solitary Gymnotus omarorum and in the gregarious Brachyhypopomus gauderio is characterized by a nocturnal increase in the basal discharge rate of electric behavior, which is mild and transient in G. omarorum and large and persistent in B. gauderio. In this study, we show that the major integrator of social behavior, AVT (arginine vasotocin), is not involved in the nocturnal increase of electric behavior basal rate in isolated animals of either species. On the other hand, endogenous melatonin, the major modulator of the circadian system, is responsible for the nocturnal increase in electric behavior in isolated individuals of both species.
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Nivel de Alerta/fisiología , Conducta Animal/fisiología , Ritmo Circadiano/fisiología , Pez Eléctrico/fisiología , Melatonina/fisiología , Conducta Social , Vasotocina/fisiología , Animales , Pez Eléctrico/metabolismo , Gymnotiformes/metabolismo , Gymnotiformes/fisiología , Uruguay , Vasotocina/metabolismoRESUMEN
Secretoneurin (SN) in the preoptic area and pituitary of mammals and fish has a conserved close association with the vasopressin and oxytocin systems, members of a peptide family that are key in the modulation of sexual and social behaviors. Here we show the presence of SN-immunoreactive cells and projections in the brain of the electric fish, Brachyhypopomus gauderio. Secretoneurin colocalized with vasotocin (AVT) and isotocin in cells and fibers of the preoptic area. In the rostral pars distalis of the pituitary, many cells were both SN and prolactin-positive. In the hindbrain, at the level of the command nucleus of the electric behavior (pacemaker nucleus; PN), some of SN-positive fibers colocalized with AVT. We also explored the potential neuromodulatory role of SN on electric behavior, specifically on the rate of the electric organ discharge (EOD) that signals arousal, dominance and subordinate status. Each EOD is triggered by the command discharge of the PN, ultimately responsible for the basal EOD rate. SN modulated diurnal basal EOD rate in freely swimming fish in a context-dependent manner; determined by the initial value of EOD rate. In brainstem slices, SN partially mimicked the in vivo behavioral effects acting on PN firing rate. Taken together, our results suggest that SN may regulate electric behavior, and that its effect on EOD rate may be explained by direct action of SN at the PN level through either neuroendocrine and/or endocrine mechanisms.
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Pez Eléctrico/genética , Neuropéptidos/metabolismo , Secretogranina II/metabolismo , Vasotocina/metabolismo , AnimalesRESUMEN
Agonistic behavior has shaped sociality across evolution. Though extremely diverse in types of displays and timing, agonistic encounters always follow the same conserved phases (evaluation, contest and post-resolution) and depend on homologous neural circuits modulated by the same neuroendocrine mediators across vertebrates. Among neuromodulators, serotonin (5-HT) is the main inhibitor of aggression, and arginine vasotocin (AVT) underlies sexual, individual and social context differences in behavior across vertebrate taxa. We aim to demonstrate that a distinct spatio-temporal pattern of activation of the social behavior network characterizes each type of aggression by exploring its modulation by both the 5-HT and AVT systems. We analyze the neuromodulation of aggression between the intermale reproduction-related aggression displayed by the gregarious Brachyhypopomus gauderio and the non-breeding intrasexual and intersexual territorial aggression displayed by the solitary Gymnotus omarorum. Differences in the telencephalic activity of 5-HT between species were paralleled by a differential serotonergic modulation through 1A receptors that inhibited aggression in the territorial aggression of G. omarorum but not in the reproduction-related aggression of B. gauderio. AVT injection increased the motivation towards aggression in the territorial aggression of G. omarorum but not in the reproduction-related aggression of B. gauderio, whereas the electric submission and dominance observed in G. omarorum and B. gauderio, respectively, were both AVT-dependent in a distinctive way. The advantages of our model species allowed us to identify precise target areas and mechanisms of the neuromodulation of two types of aggression that may represent more general and conserved strategies of the control of social behavior among vertebrates.
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Agresión , Pez Eléctrico/fisiología , Neurotransmisores/metabolismo , Serotonina/metabolismo , Vasotocina/metabolismo , Animales , Conducta Animal , Femenino , Masculino , Conducta Sexual Animal , TerritorialidadRESUMEN
The aim of the present study was to examine the role of oxytocin (OT) in the progesterone (P4) and prostaglandins (PGs) pathway to induce oocyte meiotic resumption. Cumulus-oocyte complexes were co-cultured with follicular hemisections for 15 h to determine the effects of different doses of OT or atosiban (ATO; oxytocin receptor antagonist) on oocyte meiotic resumption. In another experiment, we examined the effect of the interaction between P4, OT and PGs on the regulatory cascade of the oocyte meiotic resumption. Oxytocin at 1 µm was effective in inducing meiotic resumption in oocytes co-cultured with follicular cells (84.0%), not differing from the positive control group (74.4%). Atosiban inhibited in a dose-dependent manner the positive effect of OT on the meiotic resumption (27.6% metaphase I with 10 µm of ATO, which did not differ from the 25.5% of the negative control group). Furthermore, a third experiment showed that P4 was able to induce oocyte meiotic resumption, which was inhibited by ATO. However, the OT positive effect was not blocked by mifepristone (P4 antagonist), but was inhibited by indomethacin (a non-selective PTGS2 inhibitor). Collectively, these data suggest a sequential role of P4, OT and PGs in the induction of oocyte meiotic resumption.
Asunto(s)
Bovinos , Meiosis/efectos de los fármacos , Oocitos/efectos de los fármacos , Oxitocina/farmacología , Animales , Células Cultivadas , Relación Dosis-Respuesta a Droga , Femenino , Meiosis/fisiología , Oocitos/citología , Oocitos/fisiología , Oxitócicos/administración & dosificación , Oxitócicos/farmacología , Oxitocina/administración & dosificación , Tocolíticos/administración & dosificación , Tocolíticos/farmacología , Vasotocina/administración & dosificación , Vasotocina/análogos & derivados , Vasotocina/farmacologíaRESUMEN
Las acciones de la oxitocina contemplan aspectos que incluyen la modulación de conductas destinadas al cuidado y crecimiento saludable de la descendencia. la oxitocina está relacionada con patrones sexuales y conducta maternal, actúa como neurotransmisor en el cerebro ejerciendo un papel esencial regulando el comportamiento social y afectivo. Investigaciones recientes demostraron que la oxitocina aumenta la empatía, facilita la conducta social, la confieanza hacia otros, y modifica la forma de procesamiento de las señales sociales, su codificación e interpretación, para así lograr una adecuada relación con pares. Estudios que apoyan el posible uso terapéutico de estas neurohormonas revelan datos alentadores al demostrar que mejoran la ansiedad social, que la oxitocina reduciría los síntomas psicóticos y disminuye déficit de la cognición social que no mejoran con tratamientos actuales. Por razones farmacocinéticas la vía de administración terpéutica es intranasal, lo cual aporta comodidad en su aplicación. Los trastornos psiquiátricos que se están investigando para evaluar el potencial beneficio del uso de estos neuropéptidos son esquizofrenia, trastornos del espectro autista, trastornos de ansiedad y estrés, y trastorno bordeline de la personalidad. El objetivo de esta revisión es actualizar avances en la investigación que sustentan la tuilización de estos neuropéptidos como propuesta terapéutica en psiquiatría
Oxytocin effects encompass aspects which include the modulation of behaviors intended for the care and healthy gowth of the offspring. Oxytocin is related to sexual patterns and maternal behavior and acts as a neurotransmitter in the brain, playing a key role in social and affective behavior. Recent studies have demonstrated that oxytocin increases empathy, facilitates social behavior, trust towards others, and also changes the way in which social signals are processed, as well as their coding and interpretation, thus leading to a suitable relationship with peers. Studies supporting the potential therapeutic use of these neurohormones reveal encouraging data by demonstrating that these imporve social anxiety, that oxyctocin might reduce psychotic symptoms and social cognitive deficit that do not imporve with the treatments aviable. For pharmacokinetics reasons, the route of administration of oxytocin is intranasal, which makes its application more comfortable. The psychiatric disorders which disorders that are currently being investigated to assess the potential benefit of oxytocin are schizophrenia, autistic spectrum disorders, anxiety disorders and stress, and bordeline personality disorder. The purpose of this review is to provide an updante on the investigations that justify the use of these neuropeptide as therapeutic treatment
Asunto(s)
Humanos , Empatía , Neuropéptidos , Oxitocina/uso terapéutico , Conducta Social , Síndrome de Asperger/terapia , Trastorno Autístico/terapia , Trastorno de Personalidad Antisocial/diagnóstico , Trastorno de Personalidad Antisocial/terapia , Trastornos de Ansiedad/terapia , Vasotocina/uso terapéuticoRESUMEN
Las acciones de la oxitocina contemplan aspectos que incluyen la modulación de conductas destinadas al cuidado y crecimiento saludable de la descendencia. la oxitocina está relacionada con patrones sexuales y conducta maternal, actúa como neurotransmisor en el cerebro ejerciendo un papel esencial regulando el comportamiento social y afectivo. Investigaciones recientes demostraron que la oxitocina aumenta la empatía, facilita la conducta social, la confieanza hacia otros, y modifica la forma de procesamiento de las señales sociales, su codificación e interpretación, para así lograr una adecuada relación con pares. Estudios que apoyan el posible uso terapéutico de estas neurohormonas revelan datos alentadores al demostrar que mejoran la ansiedad social, que la oxitocina reduciría los síntomas psicóticos y disminuye déficit de la cognición social que no mejoran con tratamientos actuales. Por razones farmacocinéticas la vía de administración terpéutica es intranasal, lo cual aporta comodidad en su aplicación. Los trastornos psiquiátricos que se están investigando para evaluar el potencial beneficio del uso de estos neuropéptidos son esquizofrenia, trastornos del espectro autista, trastornos de ansiedad y estrés, y trastorno bordeline de la personalidad. El objetivo de esta revisión es actualizar avances en la investigación que sustentan la tuilización de estos neuropéptidos como propuesta terapéutica en psiquiatría (AU)
Oxytocin effects encompass aspects which include the modulation of behaviors intended for the care and healthy gowth of the offspring. Oxytocin is related to sexual patterns and maternal behavior and acts as a neurotransmitter in the brain, playing a key role in social and affective behavior. Recent studies have demonstrated that oxytocin increases empathy, facilitates social behavior, trust towards others, and also changes the way in which social signals are processed, as well as their coding and interpretation, thus leading to a suitable relationship with peers. Studies supporting the potential therapeutic use of these neurohormones reveal encouraging data by demonstrating that these imporve social anxiety, that oxyctocin might reduce psychotic symptoms and social cognitive deficit that do not imporve with the treatments aviable. For pharmacokinetics reasons, the route of administration of oxytocin is intranasal, which makes its application more comfortable. The psychiatric disorders which disorders that are currently being investigated to assess the potential benefit of oxytocin are schizophrenia, autistic spectrum disorders, anxiety disorders and stress, and bordeline personality disorder. The purpose of this review is to provide an updante on the investigations that justify the use of these neuropeptide as therapeutic treatment (AU)
Asunto(s)
Humanos , Neuropéptidos , Oxitocina/uso terapéutico , Vasotocina/uso terapéutico , Conducta Social , Trastorno de Personalidad Antisocial/diagnóstico , Trastorno de Personalidad Antisocial/terapia , Trastornos de Ansiedad/terapia , Empatía , Trastorno Autístico/terapia , Síndrome de Asperger/terapiaRESUMEN
In non-mammalian vertebrates, the nonapeptide arginine-vasotocin (AVT) is involved in the regulation of social behavior related to reproduction and aggression. The cichlid fish Cichlasoma dimerus is a monogamous species with complex social hierarchies. Males are found in one of two basic alternative phenotypes: Non-territorial and territorial males. In this work we characterize the vasotocinergic system in males of C. dimerus in relation to social status with particular emphasis on the various putative sites of action of AVT across the hypothalamic-pituitary-gonad (HPG) axis, and its effects on reproductive and social behavior. The location and distribution of vasotocinergic neurons in the brain was studied, highlighting a morphometric analysis of AVT producing neurons in males of different social status. The effect of AVT on pituitary gonadotropin secretion was analyzed by single pituitary culture while expression of AVT in peripheral organs was studied by RT-PCR using specific primers. Finally, the role of AVT on testicular androgen release was assessed by in vitro incubation of testis. Results showed a positive effect of AVT on gonadotropin secretion, where ß-LH showcased a triphasic response under increasing AVT concentration, while ß-FSH's response was dose-dependent and directly proportional. AVT showed a positive and concentration-dependent effect over testicular androgens synthesis and secretion in vitro. Vasotocin expression was observed in testicular somatic tissue located in the interstitial compartment. Thus, the AVT system in C. dimerus appears to be of high complexity, with multiple sites of action in the hypothalamus-pituitary-gonadal axis.
Asunto(s)
Cíclidos/fisiología , Conducta Sexual Animal/fisiología , Vasotocina/fisiología , Andrógenos/metabolismo , Animales , Conducta Animal/efectos de los fármacos , Encéfalo/metabolismo , Sistema Hipotálamo-Hipofisario/fisiología , Masculino , Neuronas/metabolismo , Conducta Sexual Animal/efectos de los fármacos , Conducta Social , Predominio Social , Territorialidad , Testículo/metabolismo , Vasotocina/biosíntesisRESUMEN
The Puerto Rican coquí frog, Eleutherodactylus coqui, is a directly developing frog that exhibits male territoriality and paternal behaviors. Male frogs also produce advertisement and aggressive vocalizations or calls. Territorial males emit advertisement calls to delineate territories and attract mates. Paternal males guard and brood the directly developing embryos during embryogenesis and up to five days after hatching; advertisement calling is normally absent or infrequent during paternal care. Territorial and paternal males commonly produce aggressive calls during agonistic situations. The neuropeptide, arginine vasotocin (AVT), has been shown to promote calling in anurans, including E. coqui. The objective of this study was to determine if exogenous AVT promotes calling and territorial behavior in paternal males and if it promotes males to abandon their offspring. Injections (IP) of AVT were given to paternal males immediately before the scotoperiod. Frogs were monitored for at least four hours after the injection and the following morning for calling activity and abandonment of egg clutches. AVT-injected males showed a dramatic and significant increase in aggressive calls compared to control males (saline injections). Exogenous AVT did induce advertisement calling in some paternal males but did not significantly elevate paternal males to territorial status nor did it significantly induce abandonment of eggs/embryos. In conclusion, the type of vocalization that AVT activates in E. coqui depends upon the reproductive state of the male and the social environment that surrounds the male.
Asunto(s)
Anuros/fisiología , Vasotocina/fisiología , Vocalización Animal/fisiología , Agresión , Animales , Embrión no Mamífero , Masculino , Conducta Paterna , Puerto Rico , Reproducción , Territorialidad , Vasotocina/farmacología , Vocalización Animal/efectos de los fármacosRESUMEN
PURPOSE: to test a therapeutic approach using atosiban for tocolysis, evaluating its safety and maternal and fetal side effects. METHODS: prospective study with 80 pregnant women with preterm labor admitted for tocolysis. INCLUSION CRITERIA: singleton pregnancy, regular uterine activity, cervical dilatation between 1 to 3 cm, cervical enfacement greater than 50%, 23 to 33 weeks and six days of gestational age, intact membranes, amniotic fluid index between 5 and 25, no maternal, fetal or placental diseases, no fetal growth restriction, no cervical incompetence, no fever. EXCLUSION CRITERIA: chorioamnionitis or fever during tocolysis. Atosiban group: women received 6.75 mg atosiban iv in bolus, 300 mcg/min for three hours, then 100 mcg/min for three hours and thirty minutes. If uterine activity persisted, it was maintained iv infusion of 100 mcg/min for 12.5 hand that so for as long as 45 hours. CONTROL GROUP: women received terbutaline (five ampoules, 500 mL crystalloid solution) iv infusion, 20 mL/h. If uterine activity persisted, infusion velocity was raised (20 mL/h) until uterine contractions were absent. The dose was maintained for 24 hours. RESULTS: gestational age at birth was 29 weeks and five days to 40 weeks and six days. In atosiban group, the proportion of women who had not delivered at 48 hours was 97.5%, mean interval between tocolysis and birth of 28.2 days. In control group, birth occurred before 48 hours in 22.5% of the cases; mean interval between tocolysis and birth of 5.3 days. Maternal side effects were observed in 27.5% of cases of the atosiban group, none with tachycardia, dyspnea or tachypnea. In the control group, 75% of the cases referred palpitations, tachycardia, tachypnea or headache (drug infusion was interrupted in four cases). Fetal tachycardia was observed in 22.5% of the cases (n=9). No early neonatal death was observed. CONCLUSIONS: the therapeutic approach used showed to be effective for tocolysis, with low incidence of maternal, fetal and neonatal side effects.
Asunto(s)
Tocolíticos/uso terapéutico , Vasotocina/análogos & derivados , Adulto , Femenino , Humanos , Embarazo , Estudios Prospectivos , Vasotocina/uso terapéuticoRESUMEN
The release of arachidonic acid from membrane glycerophospholipids through the action of phospholipases (PLs) is the first step in the biosynthesis of prostaglandins (PGs). In reproductive tissues, the most important PLs are cytosolic PLA(2) (cPLA(2)) and types IIA and V of the secretory isoform (sPLA(2)). The aim of this work was to investigate the role of ovarian steroid hormones and oxytocin (OT) in the regulation of rat uterine PLA(2) activity and expression during pregnancy and labor. The activity of sPLA(2) increased near labor, whereas cPLA(2) activity augmented towards the end of gestation. The levels of sPLA(2) IIA and cPLA(2) mRNA showed an increase before labor (P<0.05, day 21), whereas sPLA(2) V mRNA was not regulated during pregnancy. The administration of atosiban (synthetic OT antagonist) together with tamoxifen (antagonist of estrogen receptors) was able to decrease cytosolic and secretory PLA(2) activities, diminish the expression of sPLA(2) IIA and cPLA(2), as well as decrease PGF(2 alpha) production before the onset of labor (P<0.01). The ovarian steroid did not affect PLA(2) during pregnancy. Collectively, these findings indicate that in the rat uterus, both 17beta-estradiol and OT could be regulating the activity and the expression of the secretory and the cytosolic isoforms of PLA(2), thus controlling PGF(2 alpha) synthesis prior to the onset of labor.