The study was carried out with the aim to evaluate the effects of continuous lightning (CL) and subsequent circadian rhythm disruption on CD4+/CD8+ populations of adaptive cell immunity. For further understanding of underlying processes that affect CD4+/CD8+ proliferation and differentiation, the expression levels of CD3+ and CD95+ cell receptors were evaluated. Chinchilla rabbits were exposed to shift work simulation - 24 hours of CL. We organized 5 time-related groups: 2, 4, 6, 12 months of CL respectively. The 5th group – corresponding control. Thymus derived slides were examined using immunofluorescence assay. A decrease in the expression of CD3+ and CD8+ and an increase in the expression of CD4+ lymphocytes, which was accompanied by an increase in the ratio of CD4+/CD8+ were found after 2 months of the experiment. After 4 and 6 months of CL, there was an increase in CD3+ expression and a decrease in CD4+ and CD8+ expression. The lowest levels of CD3+, CD4+ and CD8+ were recorded after 12 months of the experiment, which is a manifestation of significant immunosuppression due to premature aging of the thymus. The level of CD95+ lymphocytes was higher in the group after 12 months of CL, indicating the activation of apoptosis in thymocytes caused by circadian rhythms disruption under the influence of chronic light stress.
The aim. Based on the study of the effect of invasive mechanical ventilation and NIV in the CPAP mode on the pathomorphosis of lung damage in patients with HRF caused by SARS-nCoV-2 and deaths in intensive care unit (ICU), determine the safest method of respiratory support. Materials and methods. The study included morphological material from 20 patients with HRF caused by SARS-nCoV-2 (COVID-19) who died in ICU. Group 1 included patients who received non-invasive lung ventilation in CPAP mode through a face mask (n=10), group 2 - patients who underwent invasive ventilation (n=10). The prepared sections, 5 μm thick, were stained according to the Van Gizon method. Photomicrographs were taken using Zeiss ZENliteimaging. Data are presented as M [25-75] and P±Sp. Statistical analysis of the results was performed using the program “Statistica 10”. Significance of differences in indicators was assessed using the nonparametric Wilcoxon test, the parametric Student's test. The results were considered reliable at values of p<0.05. Results The morphological structure of the lungs of patients of group 1 corresponded to the exudative phase of DAD with severe edematous-hemorrhagic syndrome, signs of interstitial pneumonia with desquamation of alveolocytes and the formation of hyaline membranes. In patients of group 2 in the lung tissue there was a picture of the proliferative phase of DAD with signs of interstitial pneumonia, and the development of focal fibrosing alveolitis. Thus, invasive mechanical ventilation, can accelerate the development of irreversible processes in the lungs in the form of fibrosing alveolitis and promote the formation of ventilator-associated pneumonia Conclusions. CPAP NIV is a promising method of respiratory support in patients with ARDS caused by SARS-nCoV-2 virus (COVID-19), which needs further study
The aim of the work. To study the effect of concomitant autoimmune thyroiditis (AIT) on the pathomorphological features of lesions of the esophageal mucosa in young patients with gastroesophageal reflux disease (GERD). Material and research methods. The study included 165 individuals. The contingent of the surveyed was students of Kharkov higher educational institutions. The main group consisted of 120 patients with a combined course of GERD and AIT, the comparison group included 65 individuals with an isolated GERD. The morphological form of the GERD was revealed during esophagogastroduodenoscopy (“Fuginon” system). A histomorphological study of the obtained biopsy material from the mucous membrane of the esophagus was carried out. Samples were studied on an Olympus BX-41 microscope. Morphometric study of the esophageal mucosa was performed using the Olympus DP-Soft. Research results. Histological examination of biopsy specimens revealed that the main pathomorphological signs of GERD in both groups were hyperplasia of the basal zone, lengthening of epithelial papillae, leukocyte infiltration, intercellular edema, expansion of the intercellular space, dystrophic changes, submucous fibrosis, the presence of severe inflammatory infiltration in the submucosal layer. Presence of concomitant AIT was associated with a statistically higher frequency of occurrence of certain signs: hyperplasia of the basal layer of the epithelium, elongation of the papillae, epithelial edema, expansion of the intercellular space, dystrophic changes in the epithelium (p<0.05). Conclusions. The presence of concomitant AIT in young patients with GERD does not affect the incidence of erosive GERD, but is associated with a significant increase in the severity of erosive esophagitis. The comorbid course of GERD and AIT in the student population is accompanied by a significant increase in the incidence and statistically significant intensification of the severity of hyperplasia of the basal layer of the epithelium, elongation of connective tissue papillae and leukocyte infiltration compared with isolated GERD
The aim: To evaluate the pathomorphological features of the esophageal mucous membrane in young people with GERD and autoimmune thyroiditis. Materials and methods: 120 patients with GERD and AIT and 45 people with isolated GERD matched for age, gender and social status were examined. Esophagogastroduodenoscopy, histological study and comparative morphometry of the esophageal mucosa were performed. Results: The frequency of erosive GERD in the examined groups of patients did not statistically differ. At the same time, integral analysis of the structure of erosive forms of GERD revealed statistically significant redistribution of grades of esophagitis towards its enhancement in patients with comorbid pathology. The histological study showed that in patients with GERD and AIT all the morphometric parameters studied had a significantly more severe course and exceeded similar indicators of the group with isolated GERD: epithelium total thickness, epithelium basal layer thickness, connective tissue papillae height, intercellular space. The analysis of morphological changes frequency showed that epithelium basal layer hyperplasia, dystrophic changes and epithelial edema, elongation of papillae and dilation of intercellular space were significantly more frequent in the group with comorbid pathology. Conclusions: GERD and euthyroid AIT comorbidity in the student population is accompanied by a statistically significant redistribution of esophagitis grades towards its aggravation. The presence of concomitant euthyroid AIT in patients with non-erosive GERD leads to statistically more pronounced disorganization of esophageal mucosal epithelium.
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