Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 184
Filtrar
Más filtros

Banco de datos
Tipo del documento
Intervalo de año de publicación
1.
Matern Child Nutr ; 19(4): e13523, 2023 10.
Artículo en Inglés | MEDLINE | ID: mdl-37378454

RESUMEN

Antenatal multiple micronutrient supplementation (MMS) is an intervention that can help reach three of the six global nutrition targets, either directly or indirectly: a reduction in low birth weight, stunting, and anaemia in women of reproductive age. To support global guideline development and national decision-making on investments into maternal nutrition, Nutrition International developed a modelling tool called the MMS cost-benefit tool to help users understand whether antenatal MMS is better value for money than iron and folic acid supplementation (IFAS) during pregnancy. The MMS cost-benefit tool can generate estimates on the potential health impact, budget impact, economic value, cost-effectiveness and benefit-cost ratio of investing in MMS compared to IFAS in LMICs. In the 33 countries with data included in the tool, the MMS cost-benefit tool shows that transitioning is expected to generate substantial health benefits in terms of morbidity and mortality averted and can be very cost-effective in multiple scenarios for these countries. The cost per DALY averted averages at US$ 23.61 and benefit-cost ratio ranges from US$ 41-US$ 1304: $1.0, which suggest MMS is good value for money compared with IFAS. With its user-friendly design, open access availability, and online data-driven analytics, the MMS cost-benefit tool can be a powerful resource for governments and nutrition partners seeking timely and evidence-based analyses to inform policy-decision and investments towards the scale-up of MMS for pregnant women globally.


Asunto(s)
Suplementos Dietéticos , Micronutrientes , Política Nutricional , Micronutrientes/economía , Política Nutricional/economía , Humanos , Femenino , Embarazo , Suplementos Dietéticos/economía , Análisis Costo-Beneficio , Resultado del Tratamiento
2.
Horm Behav ; 142: 105172, 2022 06.
Artículo en Inglés | MEDLINE | ID: mdl-35405411

RESUMEN

Habit formation is thought to involve two parallel processes that are mediated by distinct neural substates: one that suppresses goal-directed behavior, and one that facilitates stimulus-response (S-R) learning, which underscores habitual behavior. In previous studies we showed that habitual responding emerges early during instrumental training in gonadally-intact female, compared to male, rats. The present study aimed to determine the role of ovarian hormones during instrumental acquisition in the transition from goal-directed to habitual behavior in female rats. Ovariectomized (OVX) female rats were given subcutaneous silastic capsules that released low levels of 17-ß estradiol (E2) to maintain estrogen receptor availability. Rats were assigned to one of three hormone treatment conditions: no additional hormone replacement (Control group), replacement with high E2 (High E2 group), or replacement with high E2 followed by progesterone (High E2 + P4 group). Hormone replacement occurred twice during acquisition to mimic natural hormone fluctuations. At test, the Control and High E2 groups demonstrated responding that was sensitive to devaluation by lithium chloride-induced illness, indicating goal-directed behavior. In contrast, the High E2 + P4 group exhibited a pattern of devaluation-insensitive, habitual responding, that suggested the suppression of goal-directed processes. In a follow-up experiment, similar procedures were conducted, however during acquisition, OVX rats were given cyclic high E2 plus medroxy-progesterone (MPA), a form of progesterone that does not metabolize to neuroactive metabolites. In this group, goal-directed behavior was observed. These data indicate that habit formation is not facilitated in low estrogen states, nor in the presence of cyclic high E2. However, cyclic high E2, together with progesterone during acquisition, appears to facilitate the early emergence of habitual responding. Furthermore, these data suggest that a neuroactive progesterone metabolite, like allopregnanolone, in combination with high cyclic E2, supports this phenomenon.


Asunto(s)
Estrógenos , Progesterona , Animales , Estradiol/farmacología , Estrógenos/farmacología , Femenino , Hábitos , Humanos , Masculino , Ovariectomía , Progesterona/farmacología , Ratas , Receptores de Estrógenos
3.
J Nutr ; 149(7): 1222-1229, 2019 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-31131412

RESUMEN

BACKGROUND: Recent evidence has encouraged low- and middle-income countries to consider transitioning from long-standing iron and folic acid supplementation (IFA) to multiple micronutrient supplementation (MMS) during pregnancy; however, global guidance is limited. To facilitate national decision-making, a cost-effectiveness model to compare supplementation approaches was developed, and applied to Pakistan, India, and Bangladesh. OBJECTIVE: We evaluated the incremental cost-effectiveness of transitioning from IFA to MMS. METHODS: The effectiveness of IFA compared with MMS during pregnancy was compared using 8 health outcomes reported in 2 meta-analyses published in 2017 (Cochrane and The Lancet). Impacts on health outcomes were aggregated using disability-adjusted life years (DALYs). Costs included the supplements and their distribution through antenatal care. The incremental cost-effective ratio (ICER) for transitioning from IFA to MMS was calculated for each country under each meta-analysis scenario, and Monte Carlo simulations were applied to generate a measure of certainty around the results. RESULTS: The effectiveness of transitioning from IFA to MMS under the Cochrane scenario was smaller and less certain compared with The Lancet scenario. However, even under the Cochrane scenario, MMS would avert 4,391, 5,769, and 8,578 more DALYs than IFA per 100,000 pregnancies in Pakistan, India, and Bangladesh, respectively (62.6%, 76.8%, and 82.6% certainty). The ICER of transitioning from IFA to MMS was 41.54, 31.62, and 21.26 US dollars (USD 2016) per DALY averted, respectively. CONCLUSIONS: Despite discrepancies in the overall effect of MMS depending on the meta-analysis used, MMS is cost-effective and generates positive health outcomes for both infants and pregnant women. Whilst the effectiveness of MMS is sensitive to the prevalence of certain health outcomes under the conservative scenario (Cochrane), MMS nevertheless averts more DALYs than IFA with high certainty and should re-enter public health discussion in Pakistan, India, and Bangladesh.


Asunto(s)
Análisis Costo-Beneficio , Suplementos Dietéticos , Ácido Fólico/administración & dosificación , Hierro/administración & dosificación , Micronutrientes/administración & dosificación , Modelos Teóricos , Adulto , Asia , Femenino , Humanos , Lactante , Mortalidad Infantil , Recién Nacido , Embarazo
4.
Proc Natl Acad Sci U S A ; 111(16): 6052-7, 2014 Apr 22.
Artículo en Inglés | MEDLINE | ID: mdl-24711424

RESUMEN

Alcohol use and abuse profoundly influences a variety of behaviors, including social interactions. In some cases, it erodes social relationships; in others, it facilitates sociality. Here, we show that voluntary alcohol consumption can inhibit male partner preference (PP) formation (a laboratory proxy for pair bonding) in socially monogamous prairie voles (Microtus ochrogaster). Conversely, female PP is not inhibited, and may be facilitated by alcohol. Behavior and neurochemical analysis suggests that the effects of alcohol on social bonding are mediated by neural mechanisms regulating pair bond formation and not alcohol's effects on mating, locomotor, or aggressive behaviors. Several neuropeptide systems involved in the regulation of social behavior (especially neuropeptide Y and corticotropin-releasing factor) are modulated by alcohol drinking during cohabitation. These findings provide the first evidence to our knowledge that alcohol has a direct impact on the neural systems involved in social bonding in a sex-specific manner, providing an opportunity to explore the mechanisms by which alcohol affects social relationships.


Asunto(s)
Consumo de Bebidas Alcohólicas/fisiopatología , Arvicolinae/fisiología , Apareamiento , Caracteres Sexuales , Agresión , Animales , Femenino , Masculino , Preferencia en el Apareamiento Animal/fisiología , Neuropéptidos/metabolismo , Proteínas Proto-Oncogénicas c-fos/metabolismo
5.
Omega (Westport) ; 75(2): 124-150, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28490283

RESUMEN

Human-animal relationships are increasingly incorporated into families as a normal part of family life. Despite this, relationships with animals are often viewed as inferior to human relationships. This becomes problematic during times of loss and grief when members of a grieving companion animal owner's support system do not understand the salience of the relationship with the animal. Veterinary and other helping professionals need basic information about the experience of companion animal loss in order to help support and normalize the experiences of grieving companion animal owners. The present study qualitatively describes human-animal relationships and the subsequent loss and coping experienced by owners of beloved companion animals. Comparison with human and other types of loss and factors unique to companion animal loss are discussed, and practical applications for veterinary and other helping professionals are provided.


Asunto(s)
Adaptación Psicológica , Aflicción , Vínculo Humano-Animal , Mascotas , Adulto , Anciano , Anciano de 80 o más Años , Animales , Femenino , Humanos , Entrevistas como Asunto , Kansas , Masculino , Persona de Mediana Edad , Nebraska
6.
Horm Behav ; 79: 52-7, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26777726

RESUMEN

Affiliative social relationships are impacted by stressors and can shape responses to stress. However, the effects of stress on social relationships in different contexts are not well understood. Meadow voles provide an opportunity to study these effects on peer relationships outside of a reproductive context. In winter months, female meadow voles cohabit with peers of both sexes, and social huddling is facilitated by exposure to short, winter-like day lengths in the lab. We investigated the role of stress and corticosterone (cort) levels in social behavior in short day-housed female meadow voles. A brief forced swim elevated cort levels, and we assessed the effects of this stressor on new and established relationships between females. In pairs formed following exposure to swim stress, the stressor significantly reduced the fraction of huddling time subjects spent with a familiar partner. Swim stress did not affect partner preferences in pairs established prior to the stressor. Finally, we examined fecal glucocorticoid metabolite levels via immunoassay in voles housed under short day (10h light) versus long day (14 h light) conditions and detected higher glucocorticoid levels in long day-housed voles. These findings support a role for stress regulation in the formation of social relationships in female meadow voles, and are consistent with a potential role for seasonal variation in cort in the behavioral transition from solitary to social. Together they highlight the importance of stress and possibly glucocorticoid signaling for social behavior.


Asunto(s)
Arvicolinae , Conducta Social , Estrés Psicológico/psicología , Animales , Arvicolinae/psicología , Conducta Animal/fisiología , Corticosterona/metabolismo , Femenino , Humanos , Masculino , Preferencia en el Apareamiento Animal/fisiología , Apareamiento , Estaciones del Año , Conducta Sexual/psicología , Estrés Psicológico/fisiopatología
7.
J Dairy Sci ; 95(10): 5985-95, 2012 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-22901468

RESUMEN

The objective of this study was to determine the efficacy of Prevotella bryantii 25A as a probiotic during a subacute ruminal acidosis (SARA) challenge using a commercial probiotic as a positive control. Six multiparous ruminally fistulated cows (BW=685 ± 65 kg; (mean ± SD) in the mid-phase of lactation (70 to 148 DIM) received the following treatments in a replicated 3×3 Latin square design: (1) total mixed ration (TMR; control, CON), (2) TMR + 2g/head per day of a probiotic combination of Enterococcus faecium and Saccharomyces cerevisiae (EFSC), or (3) TMR + Prevotella bryantii 25A. The Latin square consisted of 3 wk of adaptation to the respective treatments during which the animals were fed ad libitum once per day a conventional early-lactation TMR and 1.5 kg of hay. The adaptation was followed by 4 d of SARA (no hay) and 10d of rest (adaptation diet without probiotics). Dry matter intake and milk production were depressed during SARA (22.0 and 31.8 kg/d, respectively) compared with adaptation (24.4 and 34.0 kg/d, respectively) and did not recover during rest (22.3 and 30.7 kg/d, respectively). During SARA, P. bryantii 25A had no effect on rumen pH, whereas EFSC reduced the percentage of time with pH <6.0 (71%) compared with CON (85%) and increased maximum pH. The EFSC treatment tended to increase mean pH over 24h (5.65) compared with CON (5.45). Proportion of time with pH <5.6 tended to be lower with EFSC (46%) than with CON (62%). Populations of bacteria considered to be the most important cellulose digesters in the rumen (Ruminococcus flavefaciens, Ruminococcus albus, and Fibrobacter succinogenes) were also monitored during these treatments using culture-independent real-time PCR methods. The population of R. flavefaciens was similar between the 2 feeding phases, whereas F. succinogenes and R. albus were lower during SARA compared with rest. In light of the present study, P. bryantii 25A did not prove to be an effective preventative for SARA. The role of EFSC in regulating rumen pH was confirmed, with a possible effect of maintaining R. flavefaciens populations during SARA.


Asunto(s)
Acidosis/veterinaria , Enfermedades de los Bovinos/metabolismo , Lactancia/fisiología , Prevotella/metabolismo , Probióticos/farmacología , Acidosis/metabolismo , Acidosis/fisiopatología , Amoníaco/análisis , Fenómenos Fisiológicos Nutricionales de los Animales/fisiología , Animales , Bovinos , Enfermedades de los Bovinos/fisiopatología , Ácidos Grasos Volátiles/análisis , Femenino , Contenido Digestivo/química , Concentración de Iones de Hidrógeno , Lactatos/análisis , Lactancia/metabolismo , Leche/química , Rumen/química , Rumen/metabolismo , Rumen/fisiopatología
8.
J Vet Med Educ ; 39(4): 322-30, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-23187025

RESUMEN

Mental health needs of veterinary medical students have become the focus of concern in recent years. Literature to date is scarce, but indicates a large number of veterinary medical students experience clinical levels of anxiety and depression. The present study focused on the prevalence of anxiety and depression in a sample of veterinary medical students (N=142) across four-year cohorts. Findings indicate elevated scores of anxiety and depression across the four-year cohorts. Students in their second and third years had the highest anxiety and depression scores. Perceived physical health, unclear expectations, difficulty fitting in, heavy workload, and homesickness were most relevant in explaining anxiety and depression symptom prevalence. Implications for practice and future research are addressed based on these findings.


Asunto(s)
Ansiedad/epidemiología , Depresión/epidemiología , Salud Mental , Facultades de Medicina Veterinaria , Estrés Psicológico/epidemiología , Estudiantes de Medicina/psicología , Adulto , Ansiedad/etiología , Estudios de Cohortes , Depresión/etiología , Femenino , Humanos , Kansas/epidemiología , Masculino , Prevalencia , Factores de Riesgo , Encuestas y Cuestionarios , Adulto Joven
9.
J Vet Med Educ ; 39(4): 341-58, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-23187027

RESUMEN

This study builds on previous research on predictors of depression and anxiety in veterinary medical students and reports data on three veterinary cohorts from two universities through their first three semesters of study. Across all three semesters, 49%, 65%, and 69% of the participants reported depression levels at or above the clinical cut-off, suggesting a remarkably high percentage of students experiencing significant levels of depression symptoms. Further, this study investigated the relationship between common stressors experienced by veterinary students and mental health, general health, and academic performance. A factor analysis revealed four factors among stressors common to veterinary students: academic stress, transitional stress, family-health stress, and relationship stress. The results indicated that both academic stress and transitional stress had a robust impact on veterinary medical students' well-being during their first three semesters of study. As well, academic stress negatively impacted students in the areas of depression and anxiety symptoms, life satisfaction, general health, perception of academic performance, and grade point average (GPA). Transitional stress predicted increased depression and anxiety symptoms and decreased life satisfaction. This study helped to further illuminate the magnitude of the problem of depression and anxiety symptoms in veterinary medical students and identified factors most predictive of poor outcomes in the areas of mental health, general health, and academic performance. The discussion provides recommendations for considering structural changes to veterinary educational curricula to reduce the magnitude of academic stressors. Concurrently, recommendations are suggested for mental health interventions to help increase students' resistance to environmental stressors.


Asunto(s)
Ansiedad/epidemiología , Depresión/epidemiología , Educación en Veterinaria , Salud Mental , Estrés Psicológico/epidemiología , Estudiantes de Medicina/psicología , Adulto , Estudios de Cohortes , Evaluación Educacional , Análisis Factorial , Femenino , Humanos , Masculino , Medio Oeste de Estados Unidos/epidemiología , Encuestas y Cuestionarios , Adulto Joven
10.
Alcohol Clin Exp Res ; 35(10): 1884-90, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21575019

RESUMEN

BACKGROUND: Peer interactions can have important effects on alcohol-drinking levels, in some cases increasing use, and in other cases preventing it. In a previous study, we have established the prairie vole as a model animal for the effects of social relationships on alcohol intake and have observed a correlation of alcohol intake between individual voles housed together as pairs. Here, we investigated this correlated drinking behavior, hypothesizing that 1 animal alters its alcohol intake to match the drinking of its partner. METHODS: Adult prairie voles were tested for baseline drinking levels with continuous access to 10% alcohol and water for 4 days. In Experiment 1, high alcohol drinkers (>9 g/kg/d) were paired with low alcohol drinkers (<5 g/kg/d) of the same sex on either side of a mesh divider for 4 days with continuous access to the same 2-bottle choice test. In Experiment 2, high drinkers were paired with high drinkers and low drinkers paired with low drinkers. In both experiments, animals were again separated following pairing, and drinking was retested in isolation. In Experiment 3, alcohol-naïve animals were tested for saccharin consumption (0.05%) first in isolation and then in high saccharin drinkers paired with low saccharin drinkers, and then in another isolation period. RESULTS: In Experiment 1, high drinkers paired with low drinkers significantly decreased their alcohol intake and preference from baseline drinking in isolation, and drinking levels remained significantly lower during isolation following pairing. Interestingly, there was variability between pairs in whether the high drinker decreased or the low drinker increased intake. In Experiment 2, high drinkers paired with high drinkers did not significantly change their intake level or preference, nor did low drinkers paired with low drinkers, and no changes occurred during the subsequent isolation. In Experiment 3, there was no change in saccharin intake or preference when high drinkers were paired with high drinkers or low paired with low, or in the subsequent isolation. CONCLUSIONS: Alcohol drinking of prairie voles can be altered under social conditions, such that 1 animal changes its alcohol intake to more closely match the intake of the other animal, helping to explain previous findings of correlated alcohol drinking. The effect does not extend to saccharin, a naturally rewarding sweet substance. This behavior can be used to model the peer pressure that can often affect alcohol intake in humans.


Asunto(s)
Consumo de Bebidas Alcohólicas/psicología , Grupo Paritario , Conducta Social , Consumo de Bebidas Alcohólicas/metabolismo , Animales , Arvicolinae , Conducta Animal , Depresores del Sistema Nervioso Central/farmacología , Conducta de Elección , Etanol/farmacología , Humanos , Relaciones Interpersonales , Masculino , Modelos Animales , Sacarina , Aislamiento Social , Edulcorantes
11.
Alcohol Clin Exp Res ; 35(2): 326-37, 2011 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-21070250

RESUMEN

BACKGROUND: Several meta-analyses indicate that there is an inverse genetic correlation between ethanol preference drinking and ethanol withdrawal severity, but limited work has characterized ethanol consumption in 1 genetic animal model, the Withdrawal Seizure-Prone (WSP) and-Resistant (WSR) mouse lines selected for severe or mild ethanol withdrawal, respectively. METHODS: We determined whether line differences existed in: (i) operant self-administration of ethanol during sucrose fading and under different schedules of reinforcement, followed by extinction and reinstatement of responding with conditioned cues and (ii) home cage drinking of sweetened ethanol and the development of an alcohol deprivation effect (ADE). RESULTS: Withdrawal Seizure-Prone-1 mice consumed more ethanol than WSR-1 mice under a fixed ratio (FR)-4 schedule as ethanol was faded into the sucrose solution, but this line difference dissipated as the sucrose was faded out to yield an unadulterated 10% v/v ethanol solution. In contrast, WSR-1 mice consumed more ethanol than WSP-1 mice when a schedule was imposed that procedurally separated appetitive and consummatory behaviors. After both lines achieved the extinction criterion, reinstatement was serially evaluated following oral ethanol priming, light cue presentation, and a combination of the 2 cues. The light cue produced maximal reinstatement of responding in WSP-1 mice, whereas the combined cue was required to produce maximal reinstatement of responding in WSR-1 mice. There was no line difference in the home cage consumption of a sweetened ethanol solution over a period of 1 month. Following a 2-week period of abstinence, neither line developed an ADE. CONCLUSIONS: Although some line differences in ethanol self-administration and reinstatement were identified between WSP-1 and WSR-1 mice, the absence of consistent divergence suggests that the genes underlying these behaviors do not reliably overlap with those that govern withdrawal severity.


Asunto(s)
Consumo de Bebidas Alcohólicas , Convulsiones por Abstinencia de Alcohol/genética , Síndrome de Abstinencia a Sustancias/genética , Animales , Condicionamiento Operante , Extinción Psicológica , Masculino , Ratones , Ratones Mutantes , Motivación , Refuerzo en Psicología , Autoadministración , Sacarosa/administración & dosificación
12.
Addict Biol ; 16(1): 92-107, 2011 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-20579002

RESUMEN

Social relationships strongly affect alcohol drinking in humans. Traditional laboratory rodents do not exhibit social affiliations with specific peers, and cannot adequately model how such relationships impact drinking. The prairie vole is a socially monogamous rodent used to study social bonds. The present study tested the prairie vole as a potential model for the effects of social affiliations on alcohol drinking. Same-sex adult sibling prairie voles were paired for five days, and then either separated into individual cages, or housed in pairs. Starting at the time of separation, the voles received unlimited access to alcohol in a two-bottle choice test versus water. Pair-housed siblings exhibited higher preference for alcohol, but not saccharin, than singly housed voles. There was a significant correlation between the amount of alcohol consumed by each member of a pair when they were housed together (r = 0.79), but not when housed apart (r = 0.20). Following automated analysis of circadian patterns of fluid consumption indicating peak fluid intake before and after the dark phase, a limited access two-hour two-bottle choice procedure was established. Drinking in this procedure resulted in physiologically relevant blood ethanol concentrations and increased Fos immunoreactivity in perioculomotor urocortin containing neurons (but not in nucleus accumbens or central nucleus of the amygdala). The high ethanol preference and sensitivity to social manipulation indicate that prairie voles can serve to model social influences on excessive drinking.


Asunto(s)
Consumo de Bebidas Alcohólicas/psicología , Alcoholismo/psicología , Arvicolinae/psicología , Modelos Animales de Enfermedad , Facilitación Social , Consumo de Bebidas Alcohólicas/fisiopatología , Alcoholismo/fisiopatología , Animales , Encéfalo/fisiopatología , Ritmo Circadiano/fisiología , Etanol/sangre , Masculino , Tasa de Depuración Metabólica/fisiología , Ratones , Ratones Endogámicos C57BL , Neuronas/efectos de los fármacos , Neuronas/fisiología , Apego a Objetos , Proteínas Proto-Oncogénicas c-fos/metabolismo , Aislamiento Social , Especificidad de la Especie
13.
Neurosci Lett ; 730: 135027, 2020 06 21.
Artículo en Inglés | MEDLINE | ID: mdl-32437898

RESUMEN

Multiple lines of evidence implicate the serotonin (5-HT) system in social function, including biomarker findings in autism spectrum disorder. In mice, knock-in of a rare Gly56Ala substitution in the serotonin transporter (SERT) causes elevated whole blood 5-HT levels, increased 5-HT clearance in the brain, and altered social and repetitive behavior. To further examine the molecular impact of this variant on social response, SERT Ala56 mutant mice and wildtype littermate controls were exposed to a social or non-social stimulus. We examined the differential activation of the prefrontal cortex, lateral amygdala, and medial amygdala, to social stimuli through RNA sequencing. Differentially expressed genes were enriched in axonal guidance signaling pathways, networks related to nervous system development and function, neurological and psychiatric disorders, and behavior. These identified pathways and networks may shed light on the molecular cascades underlying the impact of altered SERT function on social behavior.


Asunto(s)
Trastorno del Espectro Autista/metabolismo , Encéfalo/crecimiento & desarrollo , Expresión Génica/fisiología , Neuronas/metabolismo , Proteínas de Transporte de Serotonina en la Membrana Plasmática/genética , Animales , Modelos Animales de Enfermedad , Masculino , Ratones , Serotonina/metabolismo , Conducta Social
14.
Science ; 212(4495): 675-6, 1981 May 08.
Artículo en Inglés | MEDLINE | ID: mdl-7221555

RESUMEN

Rates of oxalate degradation by microbes in gastrointestinal contents from rabbits, guinea pigs, swine and a horse increased after additional of oxalate to diets. A similar response was previously observed with ruminal microbes from cattle and sheep. Bacterial that utilize oxalate for growth appear to be selected by increased levels of dietary oxalate.


Asunto(s)
Ciego/microbiología , Oxalatos/metabolismo , Recto/microbiología , Animales , Dieta , Cobayas/microbiología , Caballos/microbiología , Conejos/microbiología , Ratas/microbiología , Porcinos/microbiología
15.
Autism Res ; 12(5): 732-743, 2019 05.
Artículo en Inglés | MEDLINE | ID: mdl-30977597

RESUMEN

The K-Cl cotransporter KCC2 is essential in the development of the "GABA switch" that produces a change in neuronal responses to GABA signaling from excitatory to inhibitory early in brain development, and alterations in this progression have previously been hypothesized to play a causal role in autism spectrum disorder (ASD). We investigated the KCC2b (Slc12a5) heterozygous knockout mouse using a battery of rodent behavioral tests relevant to core and comorbid ASD symptoms. Compared to wild-type littermates, KCC2+/- mice were normal in standard measures of locomotor activity, grooming and digging behaviors, and social, vocalization, and anxiety-like behaviors. However, KCC2+/- mice exhibited increased social dominance behaviors and increased amplitude of spontaneous postsynaptic currents in the medial prefrontal cortex (PFC) that were previously implicated in governing social hierarchy and dominance behaviors. Treatment of wild-type mouse brain slices with the KCC2 inhibitor VU0240511 increased the amplitude and frequency of excitatory postsynaptic currents, partially recapitulating the phenotype of KCC2+/- mice. These findings indicate that the activity of KCC2 plays a role in social dominance, in parallel with effects on PFC signaling, further suggesting that KCC2 function has some relevance to social behavior but without the breadth of impact on autism-like behavior suggested by previous studies. Further testing could assess whether KCC2 alters other circuits and whether additional factors such as environmental insults may precipitate autism-related behavioral phenotypes. Autism Research 2019, 12: 732-743. © 2019 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: A mouse model of altered chloride transporter expression was used to look for a role in behaviors and brain function relevant to autism. There was an imbalance in signaling in the prefrontal cortex, and increased social dominance behavior, although other autism-related behaviors were not changed. These findings indicate that altered chloride transporter function affects prefrontal cortex function and social dominance without a broader impact on autism-like behaviors.


Asunto(s)
Trastorno Autístico/fisiopatología , Conducta Animal/fisiología , Fenómenos Electrofisiológicos/fisiología , Neuronas/fisiología , Corteza Prefrontal/fisiopatología , Predominio Social , Animales , Modelos Animales de Enfermedad , Masculino , Ratones , Ratones Noqueados
16.
J Dairy Sci ; 91(9): 3536-43, 2008 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-18765612

RESUMEN

Ingestion of high levels of rapidly fermented carbohydrates after parturition often leads to the production of excessive quantities of organic acids that may exceed the buffering capacity of the rumen and cause pH to drop. Ruminal acidosis results in animal discomfort, anorexia, depression, decreased digestibility, and decreased milk production. In the present study, we examined the effects of daily addition of cells of a newly isolated strain of Prevotella bryantii (25A) to the rumen of 12 ruminally cannulated cows in early lactation. This strain was selected based on earlier in vitro studies that indicated its ability to grow rapidly, compete for starch, and produce organic acids other than lactate. After calving, all cows received increasing amounts of an energy-dense diet containing barley grain, corn silage, and grass silage in a 40:60 forage-to-concentrate ratio. Animals were blocked according to milk production from their previous lactation. Treatments (control and P. bryantii) were distributed among cows within the same block. Cows were fed once a day. Six cows were given a daily dose of P. bryantii (2 x 10(11) cells/dose), administered directly with a syringe through the rumen cannula, from 3 wk prepartum up to 7 wk postpartum. Rumen fluid was sampled before feeding and at 2 and 3 h postfeeding on wk 1, 2, 3, 4, 6, and 7 postpartum. Feed intake and milk yield were recorded daily and milk composition was recorded 2 d/wk, up to wk 7 of lactation. Feed intake was similar between control and treated cows. Prevotella bryantii did not change milk production, but milk fat tended to be greater in treated cows compared with control cows (3.9 vs. 3.5%). Rumen pH was similar between the 2 groups and differed across sampling times, being higher before feeding (6.3) as opposed to 2 h (5.9) and 3 h (5.7) postfeeding. Rumen lactate concentration was similar before feeding between control and treated cows; however, 2 to 3 h after feeding, lactate concentration was lower in cows receiving P. bryantii compared with control cows (0.7 vs. 1.4 mM). This difference was maintained throughout the experimental period. Concentration of NH(3)-N was greater in treated cows than in control cows (174 vs. 142 mg/L). Acetate (65.5 vs. 57.8 mM), butyrate (12.7 vs. 10.5 mM), and branched-chain C4 fatty acid (0.90 vs. 0.75 mM) concentrations were greater in postfeeding samples of treated cows compared with control cows. Supplementing early-lactating cows with P. bryantii 25A increased ruminal fermentation products and milk fat concentration. Because signs of subacute ruminal acidosis were not observed in either treated or control cows, no conclusions can be made about possible protection against acidosis by P. bryantii.


Asunto(s)
Bovinos/fisiología , Fermentación/fisiología , Lactancia/fisiología , Prevotella/fisiología , Probióticos , Rumen , Animales , Bovinos/metabolismo , Bovinos/microbiología , Industria Lechera , Ingestión de Alimentos/fisiología , Ácidos Grasos Volátiles , Femenino , Concentración de Iones de Hidrógeno , Ácido Láctico/metabolismo , Leche/química , Leche/metabolismo , Nitrógeno/metabolismo , Embarazo , Rumen/metabolismo , Rumen/microbiología
17.
J Vet Med Educ ; 35(1): 102-9, 2008.
Artículo en Inglés | MEDLINE | ID: mdl-18339964

RESUMEN

The present study evaluated the impact of academic and non-academic stressors on depression levels in a longitudinal investigation of 78 first-year veterinary medical students enrolled at Kansas State University (KSU). Students completed the Center for Epidemiological Studies Depression Scale during their first and second semesters to evaluate the dependent variable, depression. Students provided information about specific stressors and relevant demographic variables that yielded independent variables. One-third of veterinary medical students surveyed in their first and second semesters reported depression levels above the clinical cut-off; 15% of the sample experienced an increase in depression of at least one standard deviation, despite the apparent stability of the proportion of students experiencing significant depressive symptoms. Students whose depression scores increased by one standard deviation or who maintained scores above the clinical cut-off score were identified as struggling. Struggling students reported more first-semester homesickness and academic concerns, along with difficulty fitting in with peers and poorer perceived physical health during the second semester. This study helped to identify those students most prone to develop or maintain concerning depression scores. The discussion section addresses specific suggestions for intervening with struggling students.


Asunto(s)
Depresión/epidemiología , Educación en Veterinaria , Salud Mental , Estrés Psicológico/epidemiología , Estudiantes/psicología , Adaptación Psicológica , Adulto , Ansiedad/epidemiología , Femenino , Humanos , Kansas , Masculino , Encuestas y Cuestionarios
18.
J Fam Psychol ; 21(3): 344-53, 2007 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-17874919

RESUMEN

Research traditionally has focused on the development of individual symptoms in those who experienced trauma directly but has overlooked the interpersonal impact of trauma. The current study reports data from 45 male Army soldiers who recently returned from a military deployment to Iraq (Operation Iraqi Freedom) or Afghanistan (Operation Enduring Freedom) and their female spouses/partners. The results indicated that increased trauma symptoms, particularly sleep problems, dissociation, and severe sexual problems, in the soldiers significantly predicted lower marital/relationship satisfaction for both soldiers and their female partners. The results suggest that individual trauma symptoms negatively impact relationship satisfaction in military couples in which the husband has been exposed to war trauma.


Asunto(s)
Relaciones Interpersonales , Personal Militar/psicología , Personal Militar/estadística & datos numéricos , Satisfacción Personal , Trastornos por Estrés Postraumático/psicología , Adulto , Etnicidad/etnología , Etnicidad/estadística & datos numéricos , Familia , Femenino , Libertad , Humanos , Irak , Masculino , Índice de Severidad de la Enfermedad , Trastornos por Estrés Postraumático/diagnóstico , Trastornos por Estrés Postraumático/etnología , Encuestas y Cuestionarios , Estados Unidos/etnología
19.
J Marital Fam Ther ; 33(2): 165-76, 2007 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-17437457

RESUMEN

Marriage and family therapists (MFTs) are applying their specific skill set in a variety of arenas. A new area for collaboration is veterinary medicine. The veterinary medical profession is emphasizing the importance of non-biomedical skills such as communication skills, acknowledging that human clientele are likely to view their pets as family members, and discussing veterinarian personal well-being. Each of these trends has clear application for intervention by MFTs. A discussion of how MFTs may be uniquely positioned to assist veterinary medicine is presented. An example of collaboration between MFT and veterinary medicine at Kansas State University is highlighted. Recommendations are made for development of effective educational relationships and possible private sector collaborations.


Asunto(s)
Terapia Familiar , Rol Profesional , Relaciones Profesional-Familia , Veterinarios , Conducta Cooperativa , Femenino , Humanos , Kansas , Masculino , Medicina Veterinaria
20.
J Vet Med Educ ; 34(2): 194-201, 2007.
Artículo en Inglés | MEDLINE | ID: mdl-17446648

RESUMEN

With the Journal of Veterinary Medical Education's recent summer 2005 theme issue on stress, the mental-health concerns of veterinary medical students has been brought to the forefront of the field. Since it is anticipated that research on this topic will continue and that educational institutions may implement changes based upon these results, it is of the utmost importance that this research be of the highest quality. Of particular concern with human-subject inquiries are response rates and confidentiality. In order to accommodate these concerns, an example of a survey research protocol that promotes high response rates and minimizes threats to internal validity influenced by student mistrust in assurances of confidentiality is presented. Specifically, the protocol is designed to ensure anonymity and to preserve the ability to track students longitudinally through the use of anonymous longitudinal identifiers. This protocol was tested with the first-year class of veterinary medical students at Kansas State University in October 2004 and March 2005. The two data collection periods yielded 90% and 76% response rates, respectively. The matching rate of participants, according to the anonymous longitudinal identifiers from Time 1 to Time 2, was 88%.


Asunto(s)
Confidencialidad , Estrés Psicológico/psicología , Estudiantes/psicología , Recolección de Datos , Educación en Veterinaria , Humanos , Estudios Longitudinales , Investigación , Encuestas y Cuestionarios
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA