scholarly journals Features of morphological changes in the thyroid gland of white male rats 1 day after thermal trauma of the skin on the background of the introduction of 0.9 % NaCl solution

2019 ◽  
pp. 55-59
Author(s):  
O. I. Tiron
Keyword(s):  
Thyroid Gland ◽  
White Male ◽  
Experimental Studies ◽  
Vena Cava ◽  
Scientific Data ◽  
The Body ◽  
Male Rats ◽  
Nacl Solution ◽  
Experimental Animals ◽  
Thermal Trauma

Despite the fact that the main pathogenetic factor in the development of burn disease is the alteration of the skin, the severity of the condition of patients in the acute period of the disease is due to systemic changes in the body caused by thermal factor. Being a powerful stress factor, severe burns are accompanied by activation of the hypothalamic-pituitary system. Although thyroid hormones are not considered typical "stress hormones", they also play a role in maintaining vasomotor function under stress. The question of thyroid dysfunction on the background of burn injury remains debatable, and scientific data on its morphological and ultramicroscopic changes are quite limited. The aim of the work is to establish microscopic and submicroscopic changes of the thyroid gland of experimental animals in the stage of shock after thermal trauma of the skin. Experimental studies were performed on 12 white adult male rats, which received a thermal burn of the skin of 2-3 degrees with a lesion area of 21-23 % of the skin. An infusion of 0.9 % NaCl solution at a dose of 10 ml/kg was performed into the inferior vena cava. Collection of material for histological and electron microscopic examinations was performed according to generally accepted methods. Histological specimens were examined using a MIKROmed SEO SCAN light microscope and photo-documented using a Vision CCD Camera with an image output system from histological specimens. Ultrathin sections made on an ultramicrotome UMPT-7 were contrasted with uranyl acetate, lead citrate according to the Reynolds method and studied under an electron microscope PEM-125K. Conducted micro- and submicroscopic studies of the structural components of the thyroid gland a day after the reproduction of thermal trauma to the skin on the background of the introduction of 0.9 % NaCl solution revealed reactive adjunctive-compensatory changes and initial manifestations of destruction. Vascular, stromal and parenchymal components of the organ in the stage of shock after burns correspond to the state of "stress" as a reaction to pathological exogenous exposure, and the intensification of metabolic processes in the affected organism of experimental animals.

scholarly journals Peculiarities of structural reorganization of the thyroid gland vessels in dynamics after experimental thermal trauma

2018 ◽  
Vol 22 (4) ◽  
pp. 610-615
Author(s):  
V.G. Korytskyi
Keyword(s):  
Thyroid Gland ◽  
Structural Changes ◽  
Burn Injury ◽  
White Male ◽  
The Body ◽  
Male Rats ◽  
Time Interval ◽  
Thermal Trauma ◽  
Vascular Bed ◽  
Ketamine Anesthesia

Thermal trauma and burn disease, which develops from deep, large lesions, are accompanied by significant morphological and functional changes not only in the skin, but also in organs of all systems of the body, including thyroid gland. The purpose of the study was to establish a microscopic reorganization of the animal thyroid gland in dynamics after an experimental thermal trauma. Burns of the third degree were applied under ketamine anesthesia with copper plates heated in boiled water to a temperature of 97–100 °С. The affected area corresponded 18–20% of the surface of the rat’s body. Experimental study of structural changes in the vascular bed of the thyroid gland after severe thermal trauma was carried out on laboratory white male rats weighing 160–180 g. Euthanasia of rats was performed after ketamine anesthesia, by decapitation. Structural changes in the thyroid gland were studied after 1, 7, 14 and 21 days from the beginning of the experiment. Histologic sections of 5–6 µm thickness were stained with hematoxylin-eosin. For the study of the connective tissue condition and its main substance, silver impregnation was performed by using the Gordon-Sweet's method (to detect reticular and immature collagen fibers), staining with 3-colored MSB — selective coloring method for intravascular coagulation syndrome. It has been established that in the early stages after the thermal trauma (1–7 days of the experiment, the stage of shock and early toxemia) there are adaptive-compensatory changes and initial signs of destruction of the vascular bed structural components of the organ. In late terms (14–21 days of the experiment, the stages of late toxemia and septicotoxemia) significant destructive-degenerative changes of the thyroid gland arteries, veins and blood vessels of the hemocirculatory bed were detected. Therefore, a severe burn injury causes deep histological modification of the thyroid gland vessels, the degree of intensity of which depends on the time interval of the experiment, which adversely affects on the functioning of the organ and transvascular metabolic processes. In further researches it is planned to study the course of morphological changes of thyroid gland vessels during thermal trauma with combined application of corrective methods.  

scholarly journals Indicators of the cell cycle in the thyroid gland in rats when using infusion of 0.9% NaCl solution on the background of thermal skin burns

2019 ◽  
Vol 25 (3) ◽  
pp. 52-57
Author(s):  
O.I. Tiron
Keyword(s):  
Cell Cycle ◽  
Thyroid Gland ◽  
White Male ◽  
S Phase ◽  
The Body ◽  
Male Rats ◽  
Estimation Methods ◽  
Control Group ◽  
Skin Damage ◽  
Nacl Solution

Systemic damage of the organs, including the thyroid gland, is one of the key factors in the pathogenesis of burn disease due to thermal skin burns. The aim of this study was to investigate the indices of the cell cycle and DNA fragmentation of thyroid gland cells in rats with the use of infusion of 0.9% NaCl solution against the background of thermal skin burns. Experimental studies were conducted on 60 white male rats weighing 160-180 g, which was subjected to thermal burns of the skin of 2-3 degrees with a total area of 21-23% of the body surface. The first 7 days rats were infused with 0.9% NaCl solution into the inferior vena cava. Animals were removed from the experiment by decapitation (after 1, 3, 7, 14, 21, and 30 days). DNA content in the nuclei of the cells of the thyroid gland of rats was determined by flow cytometry. The statistical processing of the obtained results was carried out in the license package “STATISTICA 6.1” using nonparametric estimation methods. After 1 day after thermal skin damage and using 0.9% NaCl solution, lower (p<0.05) values of the S-phase index (0.234±0.094) were found compared to the control group without burn (0.652±0.134). The maximum decrease (p<0.01) of S-phase indicators (0.622±0.110 and 0.214±0.105, respectively) and a significant increase (p<0.01) of the SUB-G0G1 interval (5.288±0.840) compared to similar control group values (2.594±0.628) is observed after 3 days. The S-phase against the background of the introduction of 0.9% NaCl solution and thermal skin burn remained significantly lower than those of the similar control groups at 7 (p<0.01), 14 (p<0.05) and 21 days (p<0.05). At 14 days after thermal skin injury, the SUB-G0G1 interval (p<0.05) was lower than in the control group of rats. After 30 days, the G0G1 phase parameters were significantly lower (p<0.01), and the G2+M phase values were significantly (p<0.01) higher than those in the control group at the same time. Thus, it was found that 0.9% NaCl solution was not effective enough to correct cell division disorders during the entire observation period after skin burns.

scholarly journals Histological picture in the skin of rats within a month after burn II-III degree against the background of the introduction for first 7 days 0.9% NaCl solution

2019 ◽  
Vol 25 (4) ◽  
pp. 17-23
Author(s):  
Ye.V. Mironov
Keyword(s):  
Standard Procedure ◽  
White Male ◽  
The Body ◽  
Male Rats ◽  
Structural Components ◽  
Skin Damage ◽  
Nacl Solution ◽  
Thermal Trauma ◽  
Relevant Today ◽  
Microscopic Studies

Burn disease is a complex of pathological changes that occur in the body due to the action of a thermal agent and are life-threatening. The problem of skin burns still remains relevant today. Insufficiently studied features of pathogenesis and methods of treatment of thermal trauma are the cause of considerable interest of scientists in this problem. The aim is to study the features of microscopic changes in the skin of rats during the month after grade II-III burn on the background of the introduction of the first 7 days of 0.9% NaCL solution. The studies were performed on 360 laboratory white male rats weighing 155-160 g. During the experiment, the animals were divided into 4 groups: 1st, 2nd groups – rats without thermal trauma infused with 0.9% NaCl solution and HAES-LX-5% at a dose of 10 ml/kg. In the 3rd, 4th groups, rats were infused with 0.9% NaCl solution and HAES-LX-5% at a dose of 10 ml/kg after skin burns. Burning skin damage was caused by applying to the lateral surfaces of the trunk of rats for 10 seconds four copper plates, heated in water at a constant temperature of 100°C. Histological preparations were prepared by standard procedure and examined using an OLYMPUS BH-2 light microscope. Conducted microscopic studies of the skin of animals after thermal trauma under the conditions of application of 0.9% NaCl solution found that in the early stages of the experiment (1, 3, 7 days) compensatory and adaptive changes of its structural components are combined with signs of destructive disorders. In the later periods of thermal trauma (14, 21 and 30 days), the destructive changes of the structural components of the skin in the lesion area deepen, and the process becomes irreversible.

scholarly journals Submicroscopic changes of alveoli of respiratory department of lungs a day after experimental thermal trauma

2019 ◽  
Vol 25 (3) ◽  
pp. 16-20
Author(s):  
Z.M. Nebesna ◽  
O.I. Bashynska ◽  
N.P. Ocheretna ◽  
G.М. Galunko ◽  
O.Ya. Slyvka
Keyword(s):  
Burn Injury ◽  
White Male ◽  
Pathological Process ◽  
The Body ◽  
Male Rats ◽  
Structural Components ◽  
Thermal Lesion ◽  
Thermal Trauma ◽  
Impaired Lung Function ◽  
Ketamine Anesthesia

Deep, large thermal burns are not limited to local lesions of tissues, they cause significant disruption of all systems and organs of the organism, change in metabolic processes. It is revealed that the primary links in the pathogenesis of burn disease are destruction of the skin, impaired neuroendocrine regulation and significant hemodynamic disorders. The reorganization of structures and impaired lung function, in response to a pathological process in the body, is attracting increasing attention of scientists. The aim of the study was to establish a submicroscopic rearrangement of the alveoli after a thermal lesion for 1 day after the experimental thermal trauma. Grade III burns were applied under ketamine anesthesia with copper plates heated in boiled water to a temperature of 97-1000С. The size of the lesion area was 18-20 % of the epilated surface of the body of rats. An experimental study of the structural components of lung alveoli after burn injury was performed on laboratory white male rats weighing 160-180 g. Euthanasia of rats was performed after ketamine anesthesia by decapitation. In the experiment, the study of the submicroscopic state of the walls of the alveoli of the lungs after thermal trauma was done. It is established that in the stage of shock after the application of burn injury – 1 day, in the alveoli of the respiratory department of the lung, there are adaptive compensatory and initial destructive changes of all structural components of the alveoli. Damage to the ultrastructure of the aerohematical barrier is manifested by intracellular edema and edema of the organelles of the endothelial cells, respiratory and secretory epitheliocytes, and the amount of heterochromatin increases in their deformed nuclei. The basement membrane also has signs of edema, sometimes homogeneous, fuzzy. The decrease in the number of vesicles and micropinocytotic vesicles in endothelial and respiratory epitheliocytes leads to impaired endothelial and alveolar metabolism. Numerous actively phagocytic alveolar macrophages with a well-expressed lysosomal apparatus are found in the alveoli. Initial alternative alterations of the ultrastructure of the components of the air-barrier barrier lead to disruption of gas exchange in the respiratory department of the lungs

STUDY OF TOXICOLOGICAL PROPERTIES OF DISINFECTANT ASTRADEZ BIOXY IN LABORATORY EXPERIMENTS

2021 ◽  
Vol 1 (4) ◽  
pp. 495-504
Author(s):  
Galina I. Pavlenko ◽  
◽  
Vasiliy I. Dorozhkin ◽  
Galina V. Filipenkova ◽  
◽  
...  
Keyword(s):  
Human Impact ◽  
Laboratory Experiments ◽  
White Male ◽  
The Body ◽  
Male Rats ◽  
Hazard Class ◽  
Experimental Animals ◽  
Toxic Compound ◽  
Toxicological Studies ◽  
Negative Effect

The article presents the results of toxicological studies, investigated the cumulative properties of disinfectant Astradez Bioxy, as well as its effect on the body of experimental animals: white male rats and white mice. It has been established that disinfectant Astradez Bioxy is a moderately toxic compound (3rd hazard class), does not have a negative effect on the body of animals and can be used for disinfection in veterinary practice. According to the degree on human impact Astradez Bioxy belongs to the 4th class of low-hazard substances.

scholarly journals Electron microscopic changes of the testis germinal epithelium after an experimental thermal trauma in the application of cryo-lyophilized xenograft skin substrate

2018 ◽  
Vol 24 (4) ◽  
pp. 53-57
Author(s):  
K.S. Volkov ◽  
S.Yu. Muha
Keyword(s):  
Burn Injury ◽  
White Male ◽  
Male Rats ◽  
Germinal Epithelium ◽  
Seminiferous Tubules ◽  
Large Area ◽  
Burn Wound ◽  
Thermal Burn ◽  
Experimental Animals ◽  
Thermal Trauma

Deep, large area of thermal trauma of the skin leads to significant morphofunctional changes in organs in the composition of the burned organism. However, condition of the central organ of the male reproductive system - testicle after burns and, especially, in the treatment of thermally damaged areas of the skin remain poorly understood. The purpose of this study was to establish an ultrastructural re-organization of testis germinal epithelium cells in the stages of toxemia and septicotoxemia following an experimental thermal trauma when using xenograft skin substrate. The studies were carried out on 35 sexually mature white male rats, which were divided into three groups: 1 - intact animals (5 rats), 2 - animals with burn injury (15 rats), 3 - animals with burn injury, for which were used xenograft skin substrate (15 rats). The burn was applied under ketamine anesthesia with copper plates, heated in boiling water, on 1820% shaved body surface of animals. Early necrectomy of the damaged areas of skin was carried out 1 day after the thermal burn. The formed wounds were covered with cryo-lyophilized xenograft skin substrate. Experimental animals were decapitated at 7, 14 and 21 days of the experiment (early, late toxemia and septicotoxemia). The material sampling for electron microscopy was carried out in accordance with a generally accepted methodology. It is established that in the stage of early toxemia (7 days of experiment) there are adaptive-compensatory changes and signs of destruction of spermatogenic cells of testis. In the stages of late toxemia and septicotoxemia (14 and 21 days of the trial), significant destructive changes occur in all components of the seminiferous tubules of the organ. Electron microscopically found that the closure of the burn wound after the early necrectomy of cryo-lyophilized xenograft skin substrate in severe experimental burn injury in the early stages of the experiment significantly reduces the damage of testis germinal epithelium of experimental animals and activates regenerative processes. This contributes to a significant improvement in the ultrastructure of the components of the convoluted tubules of the organ in the late stages of the experiment.

scholarly journals Morphological changes in the white rats’ thyroid gland 14 days after simulated thermal trauma of the skin on the background of the administration of 0.9 % NaCl solution

2021 ◽  
Vol 27 (4) ◽  
pp. 53-58
Author(s):  
O.I. Tiron
Keyword(s):  
Thyroid Gland ◽  
World Health ◽  
Ultrastructural Changes ◽  
Apical Surface ◽  
Nacl Solution ◽  
Mineral Density ◽  
Secretory Cycle ◽  
Experimental Animals ◽  
Thermal Trauma ◽  
The World

According to the World Health Organization (WHO), there are about 11 million burns in the world each year, of which 180,000 are fatal. One of the systemic consequences of burn injuries is the so-called burn-associated hypermetabolism, the clinical picture of which includes immunological dysfunction, loss of bone mineral density, endocrine disorders, including thyroid dysfunction. The aim of the study was to establish histological and ultrastructural changes of the thyroid gland of experimental animals 14 days after the simulated thermal trauma of the skin on the background of using first 7 days 0.9 % NaCl solution. At the optical and ultrastructural levels of the study 14 days after thermal skin burn on the background of 0.9 % NaCl solution in the thyroid gland of experimental animals found: follicles – mostly large, overstretched (epithelium flat, with desquamation); cytoplasm of thyrocytes is poor in organelles, part of mitochondria with damaged cristae and enlightened matrix, available electron-dense lysosomes, apical surface smoothed; there is swelling of the capsule and trabeculae, leukocyte infiltration; components of the arterial and venous bed are dilated, there is a deformation of the lumen of blood vessels; hemocapillaries are dilated with numerous erythrocytes and perivascular edema. The detected changes cause a violation of the secretory cycle of thyrocytes, transendothelial metabolism and lead to an imbalance in the production and excretion of thyroid hormones.

EVALUATION OF TOXIOLOGICAL INDICATORS OF MONTHMORRILLONITE CLAY FOR THE PURPOSE OF USING THEM AS ALUMOSILICATE SOBENT AGAINST THE NEGATIVE EFFECT OF MYCOTOXINS ON THE BODY OF ANIMALS AND BIRDS

2021 ◽  
Vol 1 (1) ◽  
pp. 72-78
Keyword(s):  
Experimental Studies ◽  
The Body ◽  
Montmorillonite Clay ◽  
Test Substance ◽  
Negative Effects ◽  
Experimental Animals ◽  
Eyelid Edema ◽  
White Rats ◽  
Mucous Membranes ◽  
Negative Effect

The article presents the results of laboratory studies to assess the toxicological parameters of montmorillonite clay from the Pogadaevskoye deposit in the West Kazakhstan region in order to use them as an aluminosilicate sorbent in the composition of feeds that reduce the negative effects of mycotoxins on the body of animals and birds. The relevance of research is associated with the cultivation of healthy and highly productive animals and poultry in order to ensure the food security of the Republic of Kazakhstan.The studies carried out to assess the toxicological parameters of montmorillonite clay in order to use them as an aluminosilicate sorbent in experimental animals (rabbits and white rats) allowed the following results to be obtained: Visual study of the intensity of erythema when exposed to the test substance on the skin of rabbits showed their absence (0 points). The study of the intensity of edema (an increase in the thickness of the skin clutch of rabbits) when exposed to the test substance on the skin of rabbits showed no reaction (0 points). Studies evaluating the irritating effect of the test substances on the mucous membranes of the eyes of rabbits by symptoms of damage showed the absence of hyperemia (0 points). Weak eyelid edema (1 point), the minimum amount of discharge in the corner of the eye (1 point). The results of studies on the classification assessment of the test substance for the severity of the irritant effect on the eyes of rabbits showed that the average total score of the severity of the irritative effect corresponds to 1 point. A comprehensive analysis of the results obtained on the basis of scientific and experimental studies to assess the toxicological indicators of montmorillonite clay from the Pogadaevskoye deposit in relation to irritating effects on the skin and mucous membranes of experimental animals (rabbits) showed their harmlessness.

scholarly journals Toxicity assessment of a technical product of the triazole class

2020 ◽  
Vol 99 (11) ◽  
pp. 1276-1279
Author(s):  
Valery N. Rakitskii ◽  
Tatiana M. Epishina ◽  
Elena G. Chkhvirkiya
Keyword(s):  
Body Weight ◽  
The Body ◽  
Male Rats ◽  
Acute Oral Toxicity ◽  
Oral Toxicity ◽  
High Biological Activity ◽  
Experimental Animals ◽  
Technical Product ◽  
White Rats ◽  
Toxicological Studies

Introduction. Historically, pesticides are evaluated more strictly from a medical point of view than other chemicals. Since their features, such as deliberate introduction into the environment, the possibility of contact with them by large masses of the population, and the high biological activity determine their potential danger to humans. Purpose of research - study of the biological effect of a technical product derived from triazoles when it is repeatedly ingested orally in mammals (rats), establishment of inactive and active doses, justification of the permissible daily dose (DSD) for humans. Material and methods. In acute experiments, white rats were used, including 6 animals in the group. Tested dose: 500-4000 mg/kg of body weight. A chronic (12 months) experiment was performed on 80 male rats with a bodyweight of 180-190 g at the beginning of the study. Tested doses: 5.0; 16.0 and 55.0 mg/kg of body weight (1 control and 3 experimental animals, 20 individuals each). In the dynamics of the experiment, we observed the condition and behavior of animals, water, and food consumption, recorded the timing of death, changes in body weight, physiological, biochemical, and hematological indices. Results. Indices of the acute oral toxicity on the studied product LD50 male rats were 2250 ± 483 mg/kg body weight. The dose of 5.0 mg / kg of body weight was not found to cause significant changes in all studied indices. The doses of 16.0 and 55.0 mg/kg of body weight had a polytropic effect on the body in experimental animals. Discussion. The studied product for the acute oral toxicity refers to low-hazard compounds, the doses of 16.0 and 55.0 mg/kg of body weight has a polytropic effect on the mammalian body, causing changes in carbohydrate, lipid, and lipoprotein metabolism in the body of rats - was accepted as acting. The dose of 5.0 mg / kg of body weight, when administered in rats, there are no changes in all the studied parameters throughout the experiment, is accepted as invalid. Based on the inactive dose-5.0 mg/kg of body weight and taking into account the reserve factor of 100, we have scientifically justified DSD for a person at the level of 0.05 mg/kg. Summary. The conducted sanitary and Toxicological studies indicate the need to assess the toxicity of new technical products to the mammalian body, to increase the reliability of the developed hygiene standards in environmental objects and food products.

scholarly journals PECULIARITIES OF BILIARY FUNCTION OF THE LIVER IN THE DYNAMICS OF POLYTRAUMA IN THE EXPERIMENT

2020 ◽  
Vol 16 (3) ◽  
pp. 9-13
Author(s):  
D.V. Kozak
Keyword(s):  
General Pattern ◽  
White Male ◽  
Bile Secretion ◽  
The Body ◽  
Digital Data ◽  
Male Rats ◽  
Subsequent Decrease ◽  
Biliary Function ◽  
Thiopental Sodium ◽  
Main Components

Relevance. Severe trauma is accompanied by the development of multiple organ dysfunction and the insufficiency of internal organs. The dynamics of changes in the functional state of the liver didn't investigate fully. It is the central organ of detoxification of the body, whose activity occurs in close integration with other organs and systems of the body. The objective is to find out the features of the biliary function of the liver in the dynamics of the developed model of polytrauma. Materials and methods. Polytrauma was performed using 62 nonlinear white male rats weighing 180-200 g under conditions of thiopental-sodium anesthesia (40 mg 1kg-1 intraperitoneally). In surviving animals, the biliary function of the liver was studied in 2 h, 1, 3, 7, 14, 21, and 28 days after injury. For this purpose, the common bile duct was catheterized, and bile was collected for 1 hour in animals under thiopental-sodium anesthesia (60 mg kg-1). The rate of bile excretion and the concentration of total bile acids, cholesterol, direct and indirect bilirubin in the selected portion of bile were determined. Based on these data, the rate of excretion of the studied components of bile was calculated. Euthanasia of rats throughout the experiment was performed by total bloodletting from the heart after previous thiopental-sodium anesthesia (60 mg kg-1 intraperitoneally). The obtained digital data were subject to statistical analysis. Results. In the conditions of experimental polytrauma, there is a violation of the biliary function of the liver. It is manifested in the period of an acute reaction to the trauma first (after 2 hours) by a significant it decreases, then (up to 1 day) development of polycholia - 1.52 times increased of bile secretion. Also increased excretion of the main components of bile, with their subsequent decrease to 7 days, development of the period of temporary improvement in 14 days with the repeated of exacerbation period in 21 days and approach to the norm - in 28 days. The decrease in bile secretion corresponds to a period of shock, which is characterized by the centralization of blood circulation and reduced blood supply to the organs of the gastrointestinal tract. Increased bile secretion and excretion of main bile components in 1 day after a severe injury is associated with the increased biliary polarity of hepatocytes and unloading of the liver from endotoxins. It accumulates due to tissue damage, microcirculation, and hypoxia. Subsequently, the indicators of the biliary function of the liver changed by the identified patterns of lipoperoxidation deviations, antioxidant protection, cytolysis, and endogenous intoxication. The pathogenesis of biliary disorders is the damage of the endoplasmic reticulum membranes, where the synthesis of the main components of bile. As well as the development of edema of the organ, which prevents the outflow of bile. Conclusion. The dynamics of the development of functional liver failure due to polytrauma coincides with the general pattern characteristic of the dynamics of other biochemical markers of traumatic disease. Namely: after 3 days of the post-traumatic period, there was a phase of maximum deepening of deviations of the studied indexes. After 7-14 days there was noted a phase of temporary improvement which is characterized by a change of indexes towards the norm. After 21 days there was a re-exacerbation of the pathological process. After 28 days the indexes changed towards the norm, but for most cases do not reach it. This means that in a critical state of the body the organs and systems coupling is getting worse, which are remote from the site of injury. It can be considered as a factor of compensation and adaptation directed to the survival of the organism.

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