The levels of oxidative stress in a combination of stress factors

The synergistic effects of citicoline and silymarin on liver injury and thyroid hormone disturbances in γ-irradiated rats

BACKGROUND

Exposure to ionizing radiation is inevitable due to its extensive use in industrial and medical applications. The search for effective and safe natural therapeutic agents as alternatives to chemical drugs is crucial to mitigate their side effects. This study aimed to evaluate the effects of citicoline as a standalone treatment or in combination with the anti-hepatotoxic drug silymarin in protecting against liver injury caused by γ-radiation in rats.

METHODS AND RESULTS

The rats were exposed to γ-radiation (7 Gy) and treated with citicoline (300 mg/kg/day) and/or silymarin (50 mg/kg/day). The results showed that citicoline alleviated liver damage in irradiated rats by reducing hepatic malondialdehyde levels, serum aspartate aminotransferase activity, and inflammatory mediators such as tumor necrosis factor-alpha (TNF-α), interleukin-1 beta (IL-1β), and nuclear factor-kappa B (NF-κB). It also increased acetylcholine (ACh) levels and the gene expression of the anti-inflammatory protein α7 nicotinic acetylcholine receptor (α7nAChR). Additionally, citicoline improved serum triiodothyronine (T3) levels, thyroid hormone receptor beta (TRβ) gene expression, and iodothyronine deiodinase type 1 activity in hepatic tissues of irradiated rats. Furthermore, citicoline enhanced the effects of silymarin on thyroxine (T4), TRβ, ACh, and α7nAChR when co-administered in irradiated rats. Histopathological analysis confirmed these findings, demonstrating improved liver tissue structure.

CONCLUSIONS

Citicoline mitigates γ-radiation-induced liver damage by reducing oxidative stress, activating the cholinergic anti-inflammatory pathway, and modulating thyroid hormone metabolism. These findings support the use of citicoline as a safe standalone treatment or as an adjuvant with silymarin for managing liver damage and thyroid hormone disturbances caused by γ-irradiation.

Pathomorphological characteristics of heat stress in the experiment

AIM

The purpose of this research was to explore some morphological, physiological, and biochemical changes in female and fetal Wistar rats under heat stress.

METHODS

The experiment involved 30 animals, including two experimental groups (pregnant and nonpregnant females) kept under heat stress at 32°C and one control group consisting of healthy individuals kept in standard vivarium conditions. After dissection, fixation, dehydration, and primary processing, tissue samples were embedded in a mixture of paraffin and lanolin to obtain material for sections. Sections were made using a freezing and angular microtome and stained with hematoxylin and fuchsine solutions. Changes in morphology were assessed by microscopy using a Leitz DIAPLAN system.

RESULTS

As a result of heat stress, an increase in linear cell size, capillary network area, and adrenal mass was observed; adipocytes lost lipid vacuoles; prismatic thyroid cells were replaced by flat cells; hypothyroidism; an increase in the number of osteocyte lacunae; and increased osteoclast activity in bone tissue; interstitial and intracellular oedema and caryopycnosis of ventricular cardiomyocytes; reduction in the diameter of skeletal muscle fibers and replacement of tissue with collagen fibers; water loss in the structure of myofibrils; destructive local changes, hyperchromatosis and caryopycnosis of the hippocampus.

CONCLUSIONS

The data obtained allows predicting the possible consequences of prolonged overheating of tissues of other vertebrates and the human body.

Analysis of the link between stress and cancer: implications for patient support

In a world where oncological diseases remain a serious problem for many people, the study of stress management and the provision of psychological support to prevent and treat oncological diseases are becoming increasingly relevant. The purpose of the article is to identify stress mechanisms that affect the human body and provoke the development of cancer.Additionally, it seeks to investigate the global scope of the stress-cancer connection. The methods used in the study include generalisation, analysis, synthesis, and systematisation. The study found that chronic stress can affect the immune system, neurological activity, and other processes contributing to cancer development. In addition, the study has managed to shed light on the mechanisms of stress impact on oncology, including oxidative stress and replication stress, as stimuli that threaten the normal functioning of the human body. A support program for patients with oncological diseases was developed, which included assessment, psychoeducation, methods of stress reduction, and post-treatment support for patients with oncological diseases or those predisposed to them. The study found that the introduction of stress reduction programs for cancer patients is an important step in improving their well-being and treatment outcomes.

Manganese Nanoparticles: Synthesis, Mechanisms of Influence on Plant Resistance to Stress, and Prospects for Application in Agricultural Chemistry

Manganese (Mn) is an important microelement for the mineral nutrition of plants, but it is not effectively absorbed from the soil and mineral salts added thereto and can also be toxic in high concentrations. Mn nanoparticles (NPs) are less toxic, more effective, and economical than Mn salts due to their nanosize. This article critically reviews the current publications on Mn NPs, focusing on their effects on plant health, growth, and stress tolerance, and explaining possible mechanisms of their effects. This review also provides basic information and examples of chemical, physical, and ecological ("green") methods for the synthesis of Mn NPs. It has been shown that the protective effect of Mn NPs is associated with their antioxidant activity, activation of systemic acquired resistance (SAR), and pronounced antimicrobial activity against phytopathogens. In conclusion, Mn NPs are promising agents for agriculture, but their effects on gene expression and plant microbiome require further research.

Causes of adverse outcomes in acute intestinal obstruction

OBJECTIVES

The purpose of this study is to analyse the effectiveness of methods of diagnosis and treatment of patients with acute intestinal obstruction.

METHODS

A total of 123 patients were examined, who were diagnosed based on history, an overview X-ray of the abdominal cavity, a contrast examination of the intestine, and contrast marks according to Yu. L. Shalkov and irrigoscopy. 57.4 % of patients had all typical aspects of the disease, 17.7 % - indolent aspects, and 4.8 % - atypical. In the case of colonic obstruction, the method of irrigoscopy is informative. To restore intestinal function, patients with acute intestinal obstruction of the small intestine are indicated with a Yu. L. Shalkov nasogastroenteral tube or a double-drainage nasointestinal tube. And with the colonic form of the disease, it is necessary to perform a Hartmann-type operation and establish a Maidl-type anastomosis.

RESULTS

It was noted that with indolent or atypical aspects of the disease, patients received medical care late. It is shown that in the case of resection of necrotic areas of the intestine, it is informative to determine the resection boundary using the vasoscopy method using a 1 % aqueous solution of methylene blue. It was found that the optimal distance from the edge of the resection is 3 cm.

CONCLUSIONS

The results of this study are of interest to clinicians who are engaged in the diagnosis and treatment of patients with acute intestinal obstruction.