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Query: UMLS:C0848237 (acute stress)
 4,619 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Hippocampal rhythmic slow activity (RSA) was recorded during rotation and vibration stimulation after saline and ethanol (2 g/kg) administration in restrained alcohol-sensitive (ANT) and alcohol-insensitive (AT) rats implanted with chronic bipolar electrodes in the dorsal hippocampus. The saline-treated ANT rats had more high-frequency RSA than the AT rats, especially during the rotational stimulation of the optovestibular mechanisms. The difference was not found during ethanol sessions. Plasma corticosterone levels were significantly higher in the AT than the ANT rats after the recording sessions. This first electrophysiological demonstration of an alcohol-sensitivity difference in the brain between these rat lines is discussed in relation to behavioral tilting plane test used in the development of the lines, to the different innate responses of the lines to acute stress, and to the plausible line differences in brain GABAergic and serotonergic mechanisms that are known to modulate hippocampal EEG in rodents.
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PMID:Hippocampal rhythmic slow activity in rat lines selected for differences in ethanol-induced motor impairment. 317 42

In the female rat chronic ethanol intake increased plasma levels of corticosterone; acute stress in the pregnant or lactating rat increased plasma levels of corticosterone in the fetuses or sucklings. In the lactating rat, corticosterone rapidly equilibrated between plasma and milk, so that variations in the mother's adrenocortical secretion could be promptly reflected in the suckling's body. The role of maternal adrenocortical hormone with regard to the development of pituitary-adrenocortical and behavioral activities was indicated by endocrine (plasma corticosterone), neurochemical (hippocampal corticosterone binding) and behavioral (avoidance performance) anomalies in the adult offspring of lactating rats with adrenocortical "hyperfunction" or "insufficiency." Further, the offspring of rats with adrenocortical "insufficiency" showed abnormalities in "in vitro" hypothalamus, pituitary and adrenocortex release of hormones. When searching for later effects in the offspring of drugs given to the mother in perinatal life one must be cognizant that, aside from their expected pharmacological action, drugs can produce variations in the mother pituitary-adrenocortical activity, sensed by the conceptus through the placenta or milk.
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PMID:A model for later-life effects of perinatal drug exposure: maternal hormone mediation. 408 68

Previous studies have shown that fetal ethanol exposure (FEE) may have long-term effects on the function of catecholaminergic neurons in different regions of the CNS. The present study is the first to examine the effects of FEE on regional brain catecholamine responses following acute stress (a single 60-min restraint stress), repeated stress (single periods of restraint stress on 1, 5, or 10 consecutive days), and recovery from stress (recovery for up to 60 min in the home cage following a single 60-min period of restraint stress). Both male and female offspring from FEE, pair-fed (PF), and ad libitum-fed control (C) groups were tested in adulthood to determine catecholamine content in the cortex, hypothalamus, and hippocampus. A single period of restraint reduced cortical norepinephrine (NE) content in FEE and PF animals compared with that in the cortex of C animals, and reduced hypothalamic NE content in FEE female offspring below that found in animals in all other groups. In contrast, hippocampal NE content was higher in FEE than in C animals following a single period of restraint; PF animals had intermediate levels of hippocampal NE and did not differ significantly from either FEE or C animals. Following repeated periods of restraint, cortical NE content was lower in FEE than in C animals; PF animals once again had intermediate levels of NE. Importantly, basal (nonstressed) NE content did not differ among groups in any brain area examined. In addition, several significant changes in regional brain catecholaminergic responses to acute stress were observed in animals across all treatment groups.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Prenatal ethanol exposure: changes in regional brain catecholamine content following stress. 822 1

Basal cortisol levels were compared in prisoners convicted of violent crimes, in men previously convicted of violent crimes but currently not in prison, in non-violent alcoholics, and in randomly selected control males. Most of the violent men were diagnosed with antisocial personality disorder (DSM-III-R 301.70). Morning, afternoon, and evening levels of plasma cortisol were assessed after a minimum alcohol abstinence of 24 h. The imprisoned violent men had significantly lower cortisol levels than the unimprisoned, which may reflect their prolonged alcohol abstinence and/or habituation to chronic stress. The unimprisoned violent men were heavy drinkers and their elevated sober-state cortisol may reflect temporary alcohol withdrawal or acute stress. We suggest that variations in basal cortisol are influenced more by environmental factors than by violent predisposition or antisocial personality disorder.
Alcohol Alcohol
PMID:Sober-state cortisol as a predictor of drunken violence. 937 5

The effect of alcohol use on the relationship between stress and depression in US-born Mexican American men, Mexican Americans born in Mexico, and non-Hispanic Whites born in the United States was examined in a sample obtained from the Los Angeles Epidemiological Catchment Area study. Chronic stress, measured by financial strain, and acute stress, measured by negative life events, were included in the analysis. Alcohol use was measured through a combination of frequency, quantity, and binging behavior. Non-Hispanic Whites were found to have a U-shaped relationship in which moderate drinkers, in the presence of stress, had lower levels of depression than did heavy drinkers and abstainers. No such U-shaped relationship for Mexican Americans born in the United States was indicated. Mexican Americans born in Mexico had a more J-shaped relationship, with abstainers through moderate drinkers having lower mean depression scores than did heavy drinkers.
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PMID:The relationship between alcohol, stress, and depression in Mexican Americans and non-Hispanic whites. 939 82

Corticotropin releasing factor (CRF), a neuropeptide secreted by hypothalamic and extrahypothalamic neurons, is thought to mediate stress-related behaviors. The tension reduction hypothesis suggests that ethanol drinking reduces stress; that drinking is reinforced by this reduced stress; and that the probability of drinking therefore subsequently increases. CRF also decrease food intake, and might decrease ethanol drinking similarly. We addressed these hypotheses directly by assessing the effects of intracerebroventricular (i.c.v.) CRF upon ethanol drinking (1 h/day). Rats were provided drinking tubes containing ethanol solutions that were gradually incremented in concentration (from 2% to 8% w/v, over 38 days). Ethanol intakes remained stable, ranging from 0.4 to 0.5 g/kg per hour on average, and a two-bottle choice test revealed that ethanol was preferred reliably to water. Third-i.c.v. cannulae were surgically implanted and CRF or vehicle was acutely injected immediately prior to the sessions. CRF dose-dependently reduced ethanol intake by 31% (0.5 microg) and 64% (5.0 microg), and reduced 24-h food by 9% and 21%, respectively, but did not alter body weights. I.c.v. CRF reduced ethanol drinking despite any acute stress-like effects that may have been present. Hence, these data are inconsistent with the tension reduction hypothesis. On the other hand, our results support the concept that food intake and ethanol drinking may be mediated by similar mechanisms.
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PMID:Effects of third intracerebroventricular injections of corticotropin-releasing factor (CRF) on ethanol drinking and food intake. 976 50

The purpose of this study was to examine whether acute stress exposure would alter the ataxic properties of midazolam or ethanol in rats. Rats were administered either vehicle or FG 7142 (10 mg/kg) and placed back in their home cages, or placed in restraining tubes for 90 min. Three and one-half or 24 h following injection all subjects were then administered an ataxic dose of either ethanol or midazolam and after 10 min, motoric impairment was assessed by rotarod performance. Neither FG 7142 administration nor restraint had an impact on rotarod performance 3-1/2 h later for ethanol nor 24 h later in response to midazolam. However, midazolam-induced ataxia was significantly modified 3-1/2 h following both restraint and FG 7142 exposure. Similarly, at the 24-h time point, both manipulations had a significant effect on ethanol-induced motor incoordination. Importantly, prior exposure to FG 7142 and restraint was without effect on rotarod performance in saline-treated subjects. Functional alterations in behavioral reactivity to low doses of two classes of CNS depressants by the acute stress of restraint and/or FG 7142 administration suggest the anxiogenic nature of these stressors may be the critical factor.
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PMID:FG 7142- and restraint-induced alterations in the ataxic effects of alcohol and midazolam in rats are time dependent. 997 44

Animals prenatally exposed to ethanol typically exhibit hypothalamic-pituitary-adrenal (HPA) hyperresponsiveness to stressors. In contrast to previous studies that have investigated effects of prenatal ethanol exposure on HPA responses to acute or intermittent stressors, our study investigated HPA responses to a chronic continuous stressor, cold stress (4 degrees C for 0, 1, or 3 days). We tested the hypothesis that prenatal ethanol exposure would result in increased plasma corticosterone (CORT) and adrenocorticotropin (ACTH) responses and increased peptide [corticotropin-releasing factor and vasopressin] mRNA levels in the paraventricular nucleus (PVN) of the hypothalamus compared to that in control animals. In addition, CORT and ACTH responses were measured after exposure to an acute stressor (i.p. isotonic saline injection), superimposed during chronic cold exposure, to examine possible sensitization of the HPA response to the acute stress. Thus, blood samples were collected at the end of each of the three periods of cold exposure, either before (0 min) or 15 min after acute stress. The subjects were adult male and female Sprague-Dawley rat offspring from prenatal ethanol (E), pair-fed (PF), and ad libitum-fed control (C) treatment groups. Exposure to cold stress resulted in significant body weight loss in E males at 1 day and in both males and females of all prenatal treatment groups by 3 days of cold stress. Males in all prenatal groups also exhibited significant increases in adrenal weight:body weight ratios. Cold stress alone (0 min condition) increased CORT levels in E males and overall ACTH levels in E males and females compared to controls. ACTH levels were also higher overall in E compared to control males after acute stress (15 min condition). Sensitization of the CORT response to acute stress was observed in males but not females across all prenatal treatment groups. Corticotropin-releasing factor and vasopressin mRNA levels in the PVN were not significantly affected by prenatal treatment or chronic cold stress in either males or females. In contrast, both males and females displayed increases in PVN thyrotropin-releasing hormone (TRH) mRNA levels after cold stress. These data support and extend previous work demonstrating differential effects of prenatal ethanol exposure on HPA responsiveness of male and female offspring, and suggest that E males may be more vulnerable to the effects of chronic cold stress than E females.
Alcohol Clin Exp Res 1999 Feb
PMID:Effects of prenatal ethanol exposure on hypothalamic-pituitary-adrenal responses to chronic cold stress in rats. 1006 60

The antiulcer activity of the total extract and the fractions of Stryphnodendron adstringens was studied in rats and compared with that of cimetidine. Ulcers were induced in rats by means of three experimental models: acute stress, acidified-ethanol and indomethacin. The total extract and the fractions were found to have significant antiulcer activity in the case of the acute stress and acidified-ethanol models. These findings support the use of S. adstringens extracts in the treatment of gastric lesions.
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PMID:Gastric antiulcerogenic effects of Stryphnodendron adstringens in rats. 1035 77

The antiulcer activity of Maytenus aquifolium spray dried extract was studied in rats. Ulcers were induced by means of three experimental models: acidified-ethanol, indomethacin and acute stress. The extract was found to have significant antiulcer activity against all the models studied. These results show that preparation of the extract by means of the spray dried technique does not alter the biological activity of Maytenus aquifolium.
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PMID:Antiulcer effectiveness of Maytenus aquifolium spray dried extract. 1105 47


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