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Showing 4 results for Prenatal Stress
M Hosseini-Sharifabad, Sh Hekmatimoghadam,
Volume 22, Issue 1 (4-2014)
Abstract
Introduction: Studies show that prenatal stress causes an increase in the volumes of the adrenal gland in young prenatally stressed rats. The purpose of this study was to investigate the effects of environmental condition during adolescence on reversibility of prenatal stress-induced alterations at adrenal function and structure.
Materials & methods: 2-month-old Wistar male prenatally restraint stressed rats were maintained in either an enriched-environment or standard living cages throughout the third month of life. At the end of housing period, blood corticosterone levels were measured before, after the acute stress. Also, the volume of adrenal gland was estimated using sterological techniques.
Findings: Statistical analysis of data showed that corticosterone levels after the acute stress were not significantly different among control and prenatally stressed rats exposed to enrichment environment. However, these levels were significantly higher in prenatally stressed rats exposed to standard environment in comparison to other groups. The total volume and the volume of zona fasciculate of the adrenal cortex in prenatally stressed adult rats significantly decreased following enrichment of environment while it had no effect on these parameters among other animal groups.
Discussion & conclusion: This experimental study showed that the enrichment of living environment could normalize the response of Hypothalamic-Pituitary-Adrenal axis to acute stress together with decreasing the volume of cortex of adrenal gland in adult male rats whose mothers exposed to restraint stress during the last week of gestation.
Keywords: Enrichment of environment, prenatal stress, stereology, Adrenal gland
Hassan Azhdari Zarmehri, Beniamin Alimohamadi, Hassan Abasian, Samad Nazemi, Mohammad Mohammadzadeh,
Volume 24, Issue 3 (9-2016)
Abstract
Introduction: Prenatal exposure to physical stress could affect the behavioral function of offspring after birth and also in puberty.The aim of this study was to determine the effect of prenatal exposures to chronic heterogeneous stress on anxiety-like behaviors in adult male offspring in rats.
Materials & methods: In this experimental study, 10 pregnant rats were used in control and stress groups (n = 5). The Stress group was exposed to heterogeneous stress from the day of 9 to 19 of pregnancy (10 days). After the end of pregnancy and childbirth, 10 adult male offsprings from each group were selected, using the elevated plus-maze(EPM), the anxiety-like behaviors were studied.
Findings: Exposure to stress during pregnancy significantly increased the time spent (P<0.001) and the number of entries (P<0.01) into open arms of the elevated plus maze in the offspring's of stress group compared with the control group. While the time spent in the closed arms (P<0.05) significantly decreased than that in the control group. Time to stay in the center, the number of entries into closed arm and delayed to the first entry into the open arm showed no significant difference between the two groups.
Discussion & Conclusions: Exposure to stress during pregnancy reduced anxiety-like behaviors in rats. Probably, the impact of stress during pregnancy on the incidence of these behaviors can change depending on sex and age. More research in this area could help clarify the issue.
Toraj Mohammad Zamani, Ahmadreza Movahedi, Elaheh Arabameri,
Volume 26, Issue 5 (1-2019)
Abstract
Introduction: Prenatal stress causes brain alteration and long-term effects on its structure and function. Parkinson's is a progressive neurodegenerative disease and one of the factors driving Parkinson's is the prenatal stress. The use of enrichment environments is a good way to prevent this disease. This survey has been done due to studying the measurement of environmental enrichment effectiveness on Substantia nigra tissue in rats who are suffering from Parkinson's disease and have prenatal stress.
Materials & Methods: A Laboratory research method was used .We divided 48 Wistar male rats who had been affected by prenatal stress and enriched environment, to 8 groups with 6 members; with stress (Control, sham, Parkinson, Parkinson + enrichment) and without stress (Control, sham, Parkinson, Parkinson + enrichment).
After eight weeks, we anaesthetized all the rats by the use of Ketamine and Xylasein and then injected 6mg of 6OHDA within %0/9 salt solotion of Ascorbic Acid in to the brains of the rats by Stereotaxic Surgery, and after 3 weeks the signs of Parkinson's disease became confirm by Apomorphin Test. Then we emit brains of the rats from their skulls, and after tissue process, cutting and painting, we calculated the numbers neurons by use of microscope and then the data were analyzed by One-Way ANOVA and Tukey's Post Test.
Findings: The findings showed that environmental enrichment did not completely prevent the destruction of Substantia nigra dopaminergic neurons, but the number of Substantia nigra neurons in the environmental enrichment group was significantly higher than that of the Parkinsonian group of degeneration with neurotoxin.(P≤0.001) Environmental enrichment also prevented the destructive effect of perinatal stress on the reduction of the number of Substantia nigra neurons and behavioral tests.(P <0.001)
Discussion & Conclusion: The results show the beneficial effects of enrichment in the protection of the number of more Substantia nigra neurons and suggests that enriched environmental conditions can be used as a beneficial factor in reducing the degeneration of dopaminergic neurons in Parkinson's disease Reducing the effect of prenatal stress is effective.
Toraj Mohammad Zamani, Ahmadreza Movahedi, Elahe Arab Ameri,
Volume 26, Issue 6 (3-2019)
Abstract
Introduction: Prenatal stress causes brain alteration and prolongs effects on structure and function. Parkinson's is a progressive neurodegenerative disease And one of the factors motive Parkinson's is the Prenatal stress. Exercising activity is a good way to prevent the disease. The aim of this study was to investigate the effect of mandatory exercise on Substantia nigra tissue in Perinatal Parkinson's rats.
Materials & Methods: A Laboratory research method was used. 48 Wistar male rats, half of them under prenatal stress And followed up on compulsory sports activities. Were divided into 8 groups of 6, with stress (control, sham, Parkinson, Parkinson + compulsory exercise) and without stress (control, sham, Parkinson, Parkinson + compulsory exercise). the animals received Stereotaxic Surgery after 8 weeks, Three weeks later, Parkinson's symptoms were evaluated using Apo morphine rotation test and Wire grasping. The number of substantia nigra neurons in the brain is counted using a microscope; Data were analyzed using One-Way ANOVA and Tukey's Post Test.
Ethics code: IR.IAU.SRB.REC.1396
Findings: In groups with and without stress, the number of substantia nigra neurons compulsory sports group was different from that of the control group and this difference was statistically significant (P=0.0000). The average number of substantia nigra neurons compulsory sports group in both groups with and without stress difference was low, but statistically significant (P=0.014).
Discussion & conclusions: The results refer to the effects of compulsive exercise on the better protection of Substantia nigra neurons and suggests that exercise can be effective as a beneficial factor in reducing the degeneration of dopaminergic neurons in Parkinson's disease. Prenatal stress also reduces the beneficial effects of exercise.
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