ABSTRACT
Red bone marrow samples investigation in deceased COVID-19 patients enabled to identify the phenomena of secondary hemophagocytosis. Analysis of the data showed that phagocytic reactions during infection of patients with SARS-CoV-2 are manifested both in relation to erythrocytes and leukocytes. The data obtained make it possible to expand the strategy of therapeutic measures, taking into account the new data on the mechanisms of the pathogenesis of COVID-19 in severe viral infection based on morphological findings and additional information on the involvement of young erythrocytes and lymphocytes in the structure of the red bone marrow in the cascade of pathological reactions. The results obtained confirm a wide range of aggressive damaging effects of SARS-CoV-2 in the development of multiple organ failure against the background of COVID-19 and the involvement of the red bone marrow in the pathological process. The authors supplemented information about the mechanisms of hypoxia in COVID-19, which is not only a consequence of damage to the respiratory epithelium, but also the result of damage to erythrocyte differons both at the level of red bone marrow and in peripheral blood. This fact must be taken into account in the development of a treatment strategy and in the creation of new drugs for the treatment of infected patients with various strains of SARS-CoV-2.
ABSTRACT
With the emerging of new strains of the SARS-CoV-2 coronavirus (such as B.1.1.529 for example), despite numerous studies to create effective vaccines, it becomes obvious that the relevance of studying the pathomorphology of tissue structures with damaged cellular targets has increased manifold. Most knowledge on genes of pathogenicity loses its importance for the development of antiviral agents since the reservoir for the virus is the cells, in which SARS-CoV-2 then persists. These data are more important for the development of vaccines, and the treatment strategy should be based on damaged cellular targets. The mechanisms of hypoxia in patients infected by SARS-CoV-2 with COVID-19 do not have an exhaustive explanation based only on the acute alveolar damage. Our investigation deals with the data on pathologic red bone marrow in patients with a fatal COVID-19 outcome against the background of various indicators of erythrocytes in clinical blood tests. We found in the structure of the red bone marrow that there is damage to the stroma and parenchyma as well as pathomorphological signs of damage to erythropoiesis in the patients of both groups. The data obtained on the cellular targets of SARS-CoV-2 can serve as a fundamental platform for the development of targeted conservative therapy in the treatment of patients infected with SARS-CoV-2, and should also be taken into account in severe COVID-19 cases with the risk of unfavorable prognosis.
ABSTRACT
Chung M. K., Zidar D. A., Bristow M. R., et al. (2021) warn that a historic pandemic due to the coronavirus disease, COVID-19, could have negative potential consequences for the cardiovascular system for millions of survivors worldwide [1]. At the present stage, mechanisms of the long-term consequences of COVID-19 disease caused by SARS-COV-2 are not studied well;any assumptions regarding to the consequences of SARS-Cov-2 are hypothetical. Therefore, long-term effects require indepth research in the dynamics of recovery process after severe infections and rehabilitation of survivors. This will facilitate and increase the effectiveness of the treatment protocol for this disease and its complications [2]. The duration of the incubation period of the disease, the presence of sometimes not expressed or absent symptoms makes identification of the disease caused by SARS-CoV-2, COVID-19 infection, in some cases, too complicated [3]. The duration of the rehabilitation time, the complexity of pathogenetically based treatment do not yet have comprehensive information, therefore, it is difficult to resolve the issue of the timing of vaccination of patients who have recovered from COVID-19 infection. All the data obtained for each case of the disease, depending on age, the presence of concomitant diseases and individual terms of health recovery with the characteristics of complications in the late periods after recovery, has high relevance and great importance [4]. According to Wu Y., Guo C., Tang L., (2020), the excretions of recovered patients remains dangerous for others around 5 weeks after clinical recovery [5]. At the moment, there is practically no exact information about the duration and intensity of immunity in an infection caused by SARS-CoV-2 [6]. To develop protocols of COVID-19 treatment, principles and paradigms for the development of alternative effective vaccines for the prevention COVID-19 affects the health of consumers of the vaccine, which requires long-term monitoring in the post-recovery.
ABSTRACT
To date, in the context of the COVID 19 pandemic, there are rumors and speculations about the consequences of the infection, as well as a concern on growing cancer risk due to vaccines and vaccination. In this study we reviewed the concepts of the viral action on cancer development and analyzed the data on the possibility of the malignant effect of the SARS-CoV-2 virus on cells. Analysis of the literature data showed that SARS-CoV-2 damages cells, like other viruses, but does not lead to their mutations. There are no changes in DNA, there is only misregulation of repression and expression of the genome, a perversion of signaling intercellular interactions that disrupt the mechanisms of differentiation and specialization of cells. The need of viruses to multiply in cambial cells of tissues contributes to the induction of their proliferation and the lack of specialization. Thus, the available information on the cytopathic effects caused by viruses in cells infected with COVID-19 does not yet provide information on the malignant effect of SARS-CoV-2. Our study is aimed at collecting and analyzing data that are necessary for planning effective treatment of patients with COVID 19 and predicting outcomes in the long term after the disease.
ABSTRACT
One of the formidable complications of SARS-COV-2 infection leading to death is coagulopathy. The mechanisms of the development of this pathology at the present stage have not been studied, and clinical blood tests indicate that against the background of normal blood clotting indices, only the Ddi-D-dimer protein exceeds the norm many times over. The aim of the study was to study and analyze biochemical parameters in patients of Primorsky Region (Russia) infected with SARS-COV-2 against the background of concomitant vascular pathology and the development of DIC syndrome. The authors came to the conclusion about the existence of two mechanisms of circulatory disorders in the vessels of the microvasculature, associated with the violation of the integrity of the vascular wall and destruction of erythrocytes. Further research is needed to study the mechanisms of SARS-CoV-2 aggression, leading to thrombotic complications.
ABSTRACT
The paper considers the possible mechanism of the pathogenesis of COVID-19 caused by SARS-COV-2, associated with damage to red blood cells, which the authors attribute to the main key target that triggers a cascade of reactions leading to multiple organ failure. The paper presents morphological evidence for the presence of pathological forms of erythrocytes characteristic of various anemias in the blood vessels and parenchyma of damaged lungs of patients with COVID-19. The death of red blood cells leads to cell ischemia and anemia. The defeat of brain neurons, blood vessels and hematotissue barriers in organ systems is a consequence of ischemia due to the impossibility of transferring hemoglobin by damaged erythrocytes and ends at the terminal stages of the development of the disease with their dysfunction. Adaptive erythropoiesis with an increase in erythropoietin secretion is especially dangerous for patients suffering from hypertension, and then it is impossible, since all organs involved in the synthesis of erythropoietin are damaged. In this case, the synthesis of hemoglobin is also disrupted due to a deficiency of iron and cyancobolamin, whereas toxic iron and hemosiderin are deposited in the tissues.