scholarly journals EFFECTS OF GLYPROLINES ON THE BEHAVIOR OF RATSIN THE PORSOLTTEST AND EXPERIMENTALLYINDUCED SOCIALS

2020 ◽  
Vol 10 (4) ◽  
pp. 31-34
Author(s):  
Marina Samotrueva ◽  
Anna Yasenyavskaya ◽  
Alexandra Tsibizova ◽  
Liudmila Andreeva ◽  
Nikolai Myasoedov

In this work we studied the effect of glyprolines on the behavior of rats under conditions of experimental social stress. White male rats 6-8 months of age were used in the experiment. Throughout the experiment all animals were kept in standard-barrier conditions. The effect of glyprolines on the behavior of white male rats was studied on the model of social stress, implying that the animals are kept in conditions of a constant sensory contact. Glyprolines (Selank, Pro-Gly-Pro, Pro-Gly-Pro-Leu) were injected to the animals Intraperitoneally at a dose of 100 μg/kg/day within 20 days. Porsolt test was employed to carry out behavioral analysis in the animals. The outcomes revealed that regardless of the type of behavior (aggressive and submissive) in all the animals depression and anxiety disorders were developed, whereas Selank, Pro-Gly-Pro, Pro-Gly-Pro-Leu facilitated their alleviation. Thus, our experiment has demonstrated a psychomodulatory effect of the glyprolines.

Author(s):  
Anna L. Yasenyavskaya ◽  
Marina A. Samotrueva ◽  
Aleksandra A. Tsibizova ◽  
Nikolai F. Myasoedov ◽  
Lyudmila A. Andreeva

Objective: experimental study of the influence of neuropeptides on the psychoemotional state of white male rats exposed to “social” stress. Materials and methods. A study of the psychomodulatory effect of neuropeptides (Semax, Selank, ACTH(6-9)-Pro-Gly-Pro, Pro-Gly-Pro, Pro-Gly-Pro-Leu) under conditions of experimental “social” stress was performed on white non-linear male rats. The studied neuropeptides were synthesized at the Institute of Molecular Genetics of the National Research Center “Kurchatov Institute”. The study of the effect of neuropeptides on the behavior of male white rats was carried out on the model of “social” stress, the methodological reception of which is the constant residence of animals under conditions of sensory contact in order to form aggressive and submissive types of behavior. The effect of neuropeptides on the psychoemotional state of white rats under conditions of “social” stress was assessed on the basis of studying the behavior of animals in the tests “Elevated сruciform maze” and “Porsolt”. The “Elevated cruciform maze” test makes it possible to study the behavior of animals under conditions of variable stress (with a free choice of comfortable conditions) and allows assessing: the level of anxiety of the animal; symptoms of neurological deficiency. The test “Porsolt” provides an assessment of changes in the motor activity of animals and allows you to study the severity of the depressive state. Results. It was found that the effect of “social” stress on the behavior of male rats contributed to an increase in situational anxiety and the appearance of depressive-like behavioral reactions. It has been proven that the introduction of neuropeptides (Semax, Selank, ACTH(6-9)-Pro-Gly-Pro, Pro-Gly-Pro, Pro-Gly-Pro-Leu) helps to reduce increased anxiety in animals, both with aggressive and submissive types of behavior under conditions of “social” stress thereby providing a psychomodulatory effect. Conclusion. This study expands the understanding of the regulatory role of neuropeptides in the body, demonstrating the possibility of their influence on the psychoemotional state.


2019 ◽  
Vol 19 (1S) ◽  
pp. 188-191
Author(s):  
M A Samotrueva ◽  
A L Yasenyavskaya ◽  
V Kh Murtalieva ◽  
N F Myasoedov ◽  
L A Andreeva

This study is devoted to an experimental study of the effect of Semax (Met-Glu-His-Phe-Pro-Gly-Pro) on the intensity of lipid peroxidation of the thymus and spleen lipids of male rats under conditions of “social” stress. “Social” stress in animals was modeled by the formation of aggressive and submissive behavior of males in the conditions of distant sensory contact. The intensity of lipid peroxidation (LPO) in the thymus and spleen was determined by spectrophotometry using three indicators: the initial level of products reacting with thiobarbituric acid (TBA-reactive products), the rate of spontaneous and induced by ascorbate and iron ions of LPO. “Social” stress is accompanied by an increase in peroxidation processes in immunocompetent organs, which contributes to the development of stress-induced functional disorders of the immune system. Against the background of Semax administration under “social” stress, its pronounced corrective effect on lipid peroxidation rates is observed, as evidenced by a decrease in spleen and thymus tissue homogenates of male rats in the initial level of TBA-reactive products, as well as spontaneous and ascorbate-dependent levels of lipid peroxidation.


Author(s):  
V.N. Voloshin ◽  
I.S. Voloshina ◽  
I.Yu. Vash

The aim of the paper is to study thymus variability in white rats, which were exposed to formaldehyde, and to compare these data with the indicators in control animals. Materials and Methods. The trial enrolled 72 white male rats, initial body weight 40–50 g. The animals were divided into 2 groups (36 rats in each). The first group consisted of control rats. Animals of the second group were exposed to formaldehyde inhalation, 2.766 mg/m3. To characterize the variability of the organ size, centroids were determined. The superposition of landmark configurations was performed using the generalized Procrustes analysis method, MorphoJ 1.06d program. The principal component analysis and canonical analysis of the obtained data were carried out. Results. One-Way ANOVA revealed a high level of intergroup differences in Procrust distance (F=1.34; p<0.0001). The significant effect of the duration of formaldehyde exposure on centroid size was established. The Kruskal-Wallis criterion was 19.778 (p=0.0014). The analysis of the principal components indicated that each of the first 10 components stands for more than 1 % of Procrustes coordinate variance. In this case, the first 7 components compatibly explain 91.398 % of thymus variability. The proportion of the first main component to the total variance of the Procrustes coordinates is 40.236 %. PC1 (-) shows changes in the thymus shape, mostly affecting the tops of its lobes, the middle part of the right boundary and the entire left thymus boundary. The scattering ellipses of the thymus ordinates in rats exposed to formaldehyde, in the first two canonical variables are located higher than those in the control animals. Conclusion. Formaldehyde inhalation leads to thymus changes in white rat. The most significant differences with control data are determined along the second canonical variable. Keywords: thymus, form, rat, formaldehyde, geometric morphometry. Цель. Изучение изменчивости формы тимуса белых крыс, находившихся в условиях влияния формальдегида, и сравнение этих данных с показателями, полученными у контрольных животных. Материалы и методы. Работа выполнена на 72 белых крысах-самцах с начальной массой тела 40–50 г. Животные были разделены на 2 серии (по 36 крыс). Первую серию составляли контрольные крысы. Животные второй серии подвергались ингаляционному воздействию формальдегида (ФА) в концентрации 2,766 мг/м3. Для характеристики изменчивости размеров органов определяли размер их центроидов. Процедуру суперимпозиции конфигураций ландмарок выполняли методом генерализованного прокрустова анализа с использованием программы MorphoJ 1.06d. Проводили анализ главных компонент и канонический анализ полученных данных. Результаты. Однофакторный дисперсионный анализ выявил высокий уровень межгрупповых различий по показателю прокрустовых расстояний (F=1,34; р<0,0001). Установлено значительное влияние продолжительности нахождения животных в условиях воздействия ФА на размер центроида. Критерий Краскела–Уоллиса составил 19,778 (р=0,0014). Анализ главных компонент указывал на то, что каждая из первых 10 компонент объясняет более 1 % дисперсии прокрустовых координат. При этом первые 7 компонент совместно объясняют 91,398 % изменчивости формы тимуса. Вклад первой главной компоненты в общую дисперсию прокрустовых координат составляет 40,236 %. РС1 (–) показывает изменения формы тимуса, в большей степени затрагивающие верхушки его долей, среднюю часть правого контура и весь левый контур тимуса. Эллипсы рассеивания ординат тимусов, принадлежащих крысам, подвергавшимся влиянию ФА, в пространстве первых двух канонических переменных расположены выше по отношению к таковым контрольных животных. Заключение. Ингаляционное воздействие формальдегида приводит к изменению формы тимуса белых крыс. Наибольшие различия с контрольными данными определяются вдоль второй канонической переменной. Ключевые слова: тимус, форма, крыса, формальдегид, геометрическая морфометрия.


Stress ◽  
2010 ◽  
Vol 14 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Jonathan D. Toot ◽  
John J. Reho ◽  
Jacqueline Novak ◽  
Gail Dunphy ◽  
Daniel L. Ely ◽  
...  

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