SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Bozzo,Aída Andrea; Soñez,Carlos Alberto; Monedero Cobeta,Ignacio; Avila,Rodolfo; Rolando,Alicia Nélida; Romanini,María Cristina; Lazarte,Mario; Gauna,Héctor Fernando; Mugnaini,María Teresa.

Chronic stress by immobilization during pregnancy may cause alterations in mechanisms maintaining homeostasis in the adrenal gland. The objective of this study was to quantify cellular proliferation index in the adrenal cortex during pregnancy second half and assess the effects of chronic stress on it. Adrenal cortex proliferation index in stressed rats showed a significant decrease at 12 and 17 days of gestation, while at day 21 it did not show differences with the control treatments. Moreover, proliferation index of reticular zones in control and experimental rats, exhibited a significant reduction in comparison to glomerular and fascicular zones of adrenal cortex during the three gestation days studied. In conclusion, chronic stress by immobilization...

Tipo: Journal article

Palavras-chave: Chronic stress; Cellular proliferation; Adrenal cortex; Pregnancy.

Ano: 2011

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400013

Chronic stress effects on the apoptotic index of the adrenal cortex of pregnant rats

Biocell

Bozzo,Andrea; Soñez,Carlos Alberto; Mugnaini,María Teresa; Pastorino,Isabel Cecilia; Rolando,Alicia Nélida; Romanini,María Cristina; Gauna,Héctor Fernando.

Chronic stress by immobilization during gestation can alter several mechanisms that maintain homeostasis in adrenal gland. The aim of this work was to quantify the apoptotic index of adrenal cortex during mid-pregnancy and to prove cytological characteristics by electron microscopy. The apoptotic index did not present significant differences between the adrenal cortex areas of control and experimental rats in any of the three ages studied. The day of gestation influenced significantly on the apoptotic index in both groups. This index increased as gestation progressed. It may be concluded that chronic stress by immobilization might induce the increase of apoptotic index in adrenal cortex as gestation progresses which might be related variations of plasmatic...

URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000300004

Palavras-chave: Chronic stress; Apoptosis; Adrenal cortex; Pregnancy.

Ano: 2006

Domestication, sélection et comportement du bar: variabilité des aptitudes comportementales et de la tolérance au stress de groupes génétiquement distincts de bar, Dicentrarchus labrax

ArchiMer

Millot, Sandie.

The culture of aquatic species has grown much more rapidly in recent years than that of terrestrial species. Consequently, aquatic livestock welfare is a growing concern for society. However, unlike the many studies of terrestrial animal welfare, few scientific data exist concerning fish welfare. It is generally recognized that the aquaculture environment exposes fish to many repeated stress factors which affect their health, growth, reproductive performance and feeding behaviour. Even if stress responses do not highlight all welfare disturbances, it is generally admitted that they reveal a poor welfare. Among the solutions investigated to reduce fish stress, domestication and selection appear to be the favoured approaches. However, selection has generally...

Tipo: Text

Palavras-chave: Personality; Physiological status; Growth; Swimming behaviour; Feeding behaviour; Stress tolerance; Adaptation; Welfare; Chronic stress; Acute stress; Selection; Domestication; Dicentrarchus labrax; Personnalité; Statut physiologique; Croissance; Comportement natatoire; Comportement alimentaire; Tolérance au stress; Adaptation; Bien être; Stress chronique; Stress aigu; Sélection; Domestication; Dicentrarchus labrax.

Ano: 2008

URL: http://archimer.ifremer.fr/doc/2008/these-6272.pdf

Effect of acute and repeated restraint stress on glucose oxidation to CO2 in hippocampal and cerebral cortex slices

Effect of repeated restraint stress on memory in different tasks

Torres,I.L.S.; Gamaro,G.D.; Silveira-Cucco,S.N.; Michalowski,M.B.; Corrêa,J.B.; Perry,M.L.S; Dalmaz,C..

It has been suggested that glucocorticoids released during stress might impair neuronal function by decreasing glucose uptake by hippocampal neurons. Previous work has demonstrated that glucose uptake is reduced in hippocampal and cerebral cortex slices 24 h after exposure to acute stress, while no effect was observed after repeated stress. Here, we report the effect of acute and repeated restraint stress on glucose oxidation to CO2 in hippocampal and cerebral cortex slices and on plasma glucose and corticosterone levels. Male adult Wistar rats were exposed to restraint 1 h/day for 50 days in the chronic model. In the acute model there was a single exposure. Immediately or 24 h after stress, the animals were sacrificed and the hippocampus and cerebral...

Tipo: Info:eu-repo/semantics/other

Palavras-chave: Restraint stress; Chronic stress; CO2 production; Glucose oxidation; Hippocampus; Cerebral cortex.

Ano: 2001

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100013

Gamaro,G.D.; Michalowski,M.B.; Catelli,D.H.; Xavier,M.H.; Dalmaz,C..

The present study investigated the effect of repeated stress applied to female rats on memory evaluated by three behavioral tasks: two-way shuttle avoidance, inhibitory avoidance and habituation to an open field. Repeated stress had different effects on rat behavior when different tasks were considered. In the two-way active avoidance test the stressed animals presented memory of the task, but their memory scores were impaired when compared to all other groups. In the habituation to the open field, only the control group showed a significant difference in the number of rearings between training and testing sessions, which is interpreted as an adequate memory of the task. In the handled and chronically stressed animals, on the other hand, no memory was...

Effects of crowding and sex on fecal cortisol levels of captive forest musk deer

Palavras-chave: Chronic stress; Memory; Inhibitory avoidance; Two-way active avoidance; Open field.

Ano: 1999

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300015

Biol. Res.

He,Lan; Wang,Wen-Xia; Li,Lin-Hai; Liu,Bao-Qing; Liu,Gang; Liu,Shu-Qiang; Qi,Lei; Hu,De-Fu.

BACKGROUND: Restricted space and close contact with conspecifics in captivity may be stressful for musk deer, as they are highly territorial and solitary in the wild. So we tested the effects of crowding on stress of forest musk deer (Moschus berezovskii) in heterosexual groups, using fecal cortisol analysis as a non-invasive method. 32 healthy adults during non-breeding seasons were chose as our experimental objects. Group 1 was defined as higher crowding condition, with 10-15 m²/deer (6 enclosures, 10♀ and 6♂); group 2 was defined as lower crowding condition, with 23-33 m²/deer (6 enclosures, 10♀ and 6♂). Every enclosure contained 1 male and 3 female. These patterns had been existed for years. RESULTS: The results...

Tipo: Journal article

Palavras-chave: Captivity; M. berezovskii; Fecal cortisol; Chronic stress; Crowding.

Ano: 2014

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100071

Effects of prenatal exposure to a mild chronic variable stress on body weight, preweaning mortality and rat behavior

Cabrera,R.J.; Rodríguez-Echandía,E.L.; Jatuff,A.S.G.; Fóscolo,M..

Early stimulation has been shown to produce long-lasting effects in many species. Prenatal exposure to some strong stressors may affect development of the nervous system leading to behavioral impairment in adult life. The purpose of the present work was to study the postnatal harmful effects of exposure to variable mild stresses in rats during pregnancy. Female Holtzman rats were submitted daily to one session of a chronic variable stress (CVS) during pregnancy (prenatal stress; PS group). Control pregnant rats (C group) were undisturbed. The pups of PS and C dams were weighed and separated into two groups 48 h after delivery. One group was maintained with their own dams (PS group, N = 70; C group, N = 36) while the other PS pups were cross-fostered with C...

Interaction between repeated restraint stress and concomitant midazolam administration on sweet food ingestion in rats

Palavras-chave: Prenatal stress; Chronic stress; Body weight; Behavior; Mortality; Rat.

Ano: 1999

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000009

Silveira,P.P.; Xavier,M.H.; Souza,F.H.; Manoli,L.P.; Rosat,R.M.; Ferreira,M.B.C.; Dalmaz,C..

Emotional changes can influence feeding behavior. Previous studies have shown that chronically stressed animals present increased ingestion of sweet food, an effect reversed by a single dose of diazepam administered before testing the animals. The aim of the present study was to evaluate the response of animals chronically treated with midazolam and/or submitted to repeated restraint stress upon the ingestion of sweet food. Male adult Wistar rats were divided into two groups: controls and exposed to restraint 1 h/day, 5 days/week for 40 days. Both groups were subdivided into two other groups treated or not with midazolam (0.06 mg/ml in their drinking water during the 40-day treatment). The animals were placed in a lighted area in the presence of 10 pellets...

Is the Thoroughbred race-horse under chronic stress?

Palavras-chave: Feeding behavior; Chronic stress; Benzodiazepines; Midazolam; Sweet taste; Rats.

Ano: 2000

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000001100013

Nogueira,G.P.; Barnabe,R.C..

Thoroughbred fillies were divided into three groups according to age: group 1, 7 fillies aged 1 to 2 years (G1) starting the training program; group 2, 9 fillies aged 2 to 3 years (G2) in a full training program; group 3, 8 older fillies 3 to 4 years of age (G3) training and racing. Blood samples were collected weekly from July to December. Cortisol was quantified using a solid phase DPC kit. The intra- and interassay coefficients of variation were 12.5% and 15.65% and sensitivity was 1.9 ± 0.2 nmol/l. The semester average of cortisol levels varied between groups: G1 = 148.8 ± 6.7, G2 = 125.7 ± 5.8, G3 = 101.1 ± 5.4 nmol/l, with G3 differing statistically from the other groups. The lower cortisol levels observed in the older fillies lead us to propose that...

Maternal Chronic Stress Induces Premature Telencephalic Vesicles Development

Palavras-chave: Horses; Cortisol; Exercise; Chronic stress.

Ano: 1997

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001000016

Mugnaini,María Teresa; Soñez,Carlos Alberto; Rolando,Alicia Nélida; Romanini,María Cristina; Bozzo,Aída Andrea; Pastorino,Isabel Cecilia; Gauna,Héctor Fernando; Paz,Dante Agustín.

Exposure to physical or psychological stress causes brain damage ranging from minimal behavioural alterations to different neurodegeneration degrees implying the overproduction of oxidative-nitrosative compounds, apoptosis and cell proliferation. In the present investigation, we have analysed the effect of the chronic stress by immobilisation applied to pregnant rats over the forebrain development of the embryos. The morphometric analyses showed an accelerated evagination of the telencephalic vesicles in 12 days old fetus from stressed mothers. The forebrain perimeter and the thickness showed significative differences in relation to age-matched controls. This stress effect seemed reversible during subsequent gestational stages. This is the first work...

Tipo: Journal article

Palavras-chave: Telencephalic vesicle; Chronic stress; Morphometric analysis; Rats.

Ano: 2006

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500001

Quercetin Inhibits Left Ventricular Dysfunction Induced by Chronic Stress in Rats

Relative Concentrations of Placental Lactogen II and PRL-Like Protein-A in Stressed Rats Placenta

Bin-Jaliah,Ismaeel.

Complications of chronic stress including cardiovascular disease are among the common public health problems that affect the lives of millions of people around the globe. We sought to determine whether the anti-oxidant and anti-apoptotic agent, quercetin can inhibit chronic stress-induced left ventricular dysfunction (LVD). Chronic unpredictable stress (CUS) was induced in rats using a variety of stressors in the presence and absence of quercetin (50 mg/kg body weight/day). Harvested tissues from the left ventricles (LV) of these animals were examined using basic histological staining. In addition, LV tissue homogenates were assayed for markers of oxidative and anti-oxidative stress that are known to be modulated in cardiac dysfunction. Furthermore, LV...

Tipo: Journal article

Palavras-chave: Quercetin; Chronic stress; Heart failure; Left ventricular dysfunction; Antioxidant; Apoptosis.

Ano: 2017

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200044