Dalila A. Khaydar

BACKGROUND: Stress gastric ulcers are a type of peptic ulcer that develops in response to severe physiological or psychological stress. The causes of stress ulcers in the gaster have not yet been fully studied. AIM: To evaluate the composition of lipids in the gastric mucosa in rats under acute stress. MATERIALS AND METHODS: All rats included in the study (n=30) were divided into two groups. Group 1 (main group, n=20) included animals with a model of stress gastric ulcer created by stimulation with electrical impulses for 12 h. Group 2 (control group, n=10) included animals with no manipulations. At the end of the experiment, the effective and total concentration in blood serum of all animals was measured, followed by the calculation of the albumin binding reserve, and the plasma toxicity index. We also visually assessed the degree of damage to the gastric mucosa and determined the lipid composition. RESULTS: Our study showed that a stressful situation led to endogenous intoxication in group 1. A decrease in the level of phosphatidylcholine by 16.3% and phosphatidylserine by 18.6% in stressed rats demonstrates the destruction of the cell membrane associated with apoptosis, which macroscopically manifested as spot hemorrhages, erosions, and ulcers in the gastric mucosa. An increase in monoacylglycerol by 34.4% and diacylglycerol by 53.4% in group 1 indicates an increase in membrane permeability and induction of regenerative processes. CONCLUSION: In a stressful situation, a decrease in both total and effective albumin concentrations contributes to endogenous intoxication, leading to lipid imbalance, cell membrane damage, and the development of acute gastric mucosal injury.

Purpose. To evaluate the intensity of healing of an infected skin wound in rats using Trigonella foenum- graecum (Fenugreek) against the background of experimental steroid hyperglycemia.Materials and methods. The rats included in the study (n = 20) were divided into two equal groups. First, a model of steroid hyperglycemia was created for all animals. Then the same animals (n = 20) were used to create models of infected skin wound. The rats of the first group (the main one) were treated with wound surface ointment containing Trigonella foenum- graecum. Also, Trigonella foenum- graecum extract was constantly added to the water for the rats of the first group. Intact vaseline ointment was applied to the wound of the second group (control) rats. After 5 days, we evaluated the wound regeneration activity, blood glucose levels, and blood panel in all animals.Results. This study showed several positive aspects of the use of Trigonella foenum-g raecum in terms of treatment of infected skin wounds in animals with steroid hyperglycemia. The decrease in glucose levels almost to baseline values in the rats of the main group against the background of oral administration of Trigonella foenum-g raecum was recorded. By the end of the observation, the level of glycemia was almost two times less in animals of the first group compared to the second (p < 0.05). In animals of the first group, the number of leukocytes was higher compared to the second group, but this difference was not significant. However, we recorded a significant increase in the number of granulocytes by more than two times (p < 0.05), which indicates the immunomodulatory property of Trigonella foenum- graecum, which affected the regeneration activity of the infected wound in a positive way in rats of the first group.Conclusion. As a result of this study, promising prospects have been obtained for the use of the plant‑ derived drug Trigonella foenum- graecum in the correction of hyperglycemia and the treatment of infected wounds. Application of fenugreek topically in the form of an extract reduced inflammation and improved wound healing in rats suffering from steroid hyperglycemia.

Purpose. To evaluate the regeneration of an infected skin wound in experimental steroid hyperglycemia in rats.Materials and methods. Regeneration of an infected rat skin wound (n = 30) was evaluated on the background of steroid hyperglycemia. Depending on the type of wound surface treatment, all observed animals were divided into 3 groups: the first group (n = 10) was treated with an ointment containing Cymbopogon proximus per os administration; the second group (n = 10) was treated with an ointment containing sodium fusidate 2 %; the third group (n = 10, control) the wound was treated with vaseline. After five days, local changes in the wound area and the activity of its regeneration were evaluated. We also studied the blood changes: the composition of the shaped elements and the content of total protein, albumins, transaminase activity (ALT, AST), total cholesterol, urea and creatinine.Results. The use of Cymbopogon proximus orally by rats of the first group, with induced diabetes mellitus, contributes to a decrease in serum glucose levels by almost two times compared with the second and third groups. Ointment containing Cymbopogon proximus has immunomodulatory properties: it prevents the development of leukopenia, promotes the activation of agranular immunocytes. The use of Cymbopogon proximus extract has a positive effect on the rate of wound regeneration due to several factors: reduction of hyperemia and edema, stimulation of leukocyte activity, and as a consequence activation of regeneration. We did not find a significant difference in the rate of wound regeneration when treated with an ointment based on Cymbopogon proximus extract and an ointment containing sodium fusidate (p > 0.05).Conclusion. The regeneration activity of an infected wound in rats with steroid hyperglycemia does not significantly differ when treated with antimicrobial ointment and Cymbopogon proximus. The extract of Cymbopogon proximus has a double effect in vivo: it reduces glucose levels and promotes wound healing in the condition of hyperglycemia, which is promising in the treatment of complications in diabetes mellitus.

In people worldwide, chronic periodontitis occurs in 10-15% of cases. Prolonged inflammation of periodontal tissues contributes to the formation of oxidative stress. The purpose of this study was to evaluate the level of malondialdehyde and superoxide dismutase (as indicators of oxidative stress) in periodontitis in rats. For this, in the main group of rats (n=10) a model of ligature periodontitis was created. The control group of rats (n=10) was intact. As a result, in periodontitis, the level of malondialdehyde doubled. We also found an inverse relationship between the level of lipid damage and superoxide dismutase activity. Conclusions. The level of metabolites of redox processes is significantly increased in periodontitis. This confirms a significant increase in the indicators of malondialdehyde. A decrease in superoxide dismutase activity leads to a low antioxidant status in rats.

Purpose of the study. To evaluate the antitumor efficacy of liposomal doxorubicin hydrochloride in combination with tamoxifen in the treatment of breast cancer.Materials and methods. The study included mongrel white rats (n = 30). A model of carcinogenesis (Walker 256 tumors) was created for all animals. Then we divided these rats into 3 equal groups: 1 control group (n = 10) - animals were monitored without treatment; 2 group (n = 10) - animals received neoadjuvant therapy: liposomal doxorubicin hydrochloride + cyclophosphan; 3 group (n = 10) - animals received neoadjuvant therapy with doxorubicin hydrochloride (non-liposomal) and cyclophosphan. Animals of the second and third groups received two cycles of neoadjuvant therapy. All animals were monitored for 1.5 months. We evaluated the effectiveness of antitumor therapy by measuring the size of tumors, the dynamics of their regression, and counting the number of metastases in the lungs. The toxic effects of doxorubicin hydrochloride were assessed by blood parameters: platelet and lymphocyte levels.Results. We recorded a significant inhibition of the growth of tumor nodes in the second group of rats on the 25th day from the start of the experiment compared with the first and third groups: 36004.7, 86112.1 and 38962.4 mm³, respectively. By the end of the 3rd week of the experiment, we also noted the formation of a tumor regression trend in the 2nd and 3rd groups of animals, which was reliably maintained until the end of the observation. At the end of the experiment, the number of metastases in the first group of animals was 3 times more, in the third group almost 1.5 times more than in the second (p < 0.05)Conclusion. The treatment of Walker 256 tumor with liposomal doxorubicin showed better efficacy and safety in comparison with non-liposomal doxorubicin. The tumor volume becomes smaller against the background of neoadjuvant chemotherapy with liposomal doxorubicin hydrochloride compared with its non-liposomal form, while there is no pronounced decrease in platelets and lymphocytes. We also recorded a significantly lower number of lung metastases in animals of the second group compared to other groups.

In this study, we've evaluated the myelotoxic effect of treating Walker-256 carcinoma with cytostatics, followed by correction of thrombocytopenia with liposomal and liposome-free mexidol. The study included 60 rats, which, depending on the type of treatment, were divided into 5 groups. We recorded the greatest increase in the number of platelets on the background of liposomal mexidol both on the 3rd and 7th day after the start of chemotherapy. At the end of the monitoring, the myeloprotective effect was 30% higher in the liposomal mexidol compared to its non-liposomal form. CONCLUSION: Activation of thrombocytopoiesis on the background of cytostatic therapy helps to reduce the complications related to the use of chemotherapy.

Background: Patients affected by several forms of malignant neoplasms receive chemotherapy (CT) or radiation therapy (RT). These treatments can cause many side effects, such as oral mucositis (OM). Mucositis is the most frequently occurring early side effect of conservative treatment of patients with malignant tumors in the head and neck, and it is registered in more than 60% of cases. It occurs due to the effect of chemotherapeutic drugs on the cells of the mucous membrane, which causes their death, and to a greater extent, due to the effect of ionizing radiation on the endothelium of the blood vessels and the basal cells of the mucous membrane the submucosa. Objectives: To assess the correlation between the indicators of hemomicrocirculation of the oral mucosa and the intensity of the clinical manifestations of oral mucositis. Results: It was found that, in all the subgroups, the severity index of mucositis National Cancer Institute (NCI) clearly correlated with the indicators of the flow of microcirculation through the study area at point A (r = -0.85, -0.99 and -0.77). At point A, blood perfusion in the study of hemomicrocirculation in all the subgroups 18–44 g in Ia, 45–59 g and 60–74 g in Ic was the opposite of the value of the severity of mucositis. A strong negative correlation was found between the severity of mucositis and the perfusion index at point B in subgroup Ia : (r = -0.99) along with, a moderate inverse correlation in subgroups Ib (r = -0.69) and Ic (r = -0.36). At point B, a strong inverse correlation was found in subgroups Ib and Ic (r = -0.72 and -0.65, respectively), and a moderate inverse correlation was found in subgroup Ia — NCI where r = -0.32. Conclusions: There is a negative correlation between the indicators of hemomicrocirculation of the oral mucosa and the severity of oral mucositis. It was found that the higher the lesions of the microvasculature, the lower the intensity of mucositis. These data have important prognostic value and make it possible to recommend the determination of hemomicrocirculation as a screening test.

ВЛИЯНИЕ КАЧЕСТВА ИНДИВИДУАЛЬНОЙ ГИГИЕНЫ ПОЛОСТИ РТА НА ТЯЖЕСТЬ ПОСТЛУЧЕВОГО МУКОЗИТА У ПАЦИЕНТОВ С ПЛОСКОКЛЕТОЧНЫМ РАКОМ ОРОФАРИНГЕАЛЬНОЙ ОБЛАСТИ

Стоматологический статус пациентов с плоскоклеточной карциномой орофарингеальной области