Spotlight on the impact of viral infections on Hematopoietic Stem Cells (HSCs) with a focus on COVID-19 effects.

Hematopoietic stem cells (HSCs) are known for their significant capability to reconstitute and preserve a functional hematopoietic system in long-term periods after transplantation into conditioned hosts. HSCs are thus crucial cellular targets for the continual repair of inherited hematologic, metabolic, and immunologic disorders. In addition, HSCs can undergo various fates, such as apoptosis, quiescence, migration, differentiation, and self-renewal. Viruses continuously pose a remarkable health risk and request an appropriate, balanced reaction from our immune system, which as well as affects the bone marrow (BM). Therefore, disruption of the hematopoietic system due to viral infection is essential. In addition, patients for whom the risk-to-benefit ratio of HSC transplantation (HSCT) is acceptable have seen an increase in the use of HSCT in recent years. Hematopoietic suppression, BM failure, and HSC exhaustion are all linked to chronic viral infections. Virus infections continue to be a leading cause of morbidity and mortality in HSCT recipients, despite recent advancements in the field. Furthermore, whereas COVID-19 manifests initially as an infection of the respiratory tract, it is now understood to be a systemic illness that significantly impacts the hematological system. Patients with advanced COVID-19 often have thrombocytopenia and blood hypercoagulability. In the era of COVID-19, Hematological manifestations of COVID-19 (i.e., thrombocytopenia and lymphopenia), the immune response, and HSCT may all be affected by the SARS-CoV-2 virus in various ways. Therefore, it is important to determine whether exposure to viral infections may affect HSCs used for HSCT, as this, in turn, may affect engraftment efficiency. In this article, we reviewed the features of HSCs, and the effects of viral infections on HSCs and HSCT, such as SARS-CoV-2, HIV, cytomegalovirus, Epstein-Barr virus, HIV, etc. Video Abstract.

PHYSIOLOGICAL PARAMETERS AND SEVERITY OF CORONAVIRUS INFECTION: CASE STUDY

Preface: Coronavirus has several mechanisms that facilitate its entry into the target cell such as cholesterol by acting concurrently with angiotensin-converting enzyme (ACE2) at entry site, where the virus uses it to increase its entry and spread. We conducted a practical research for measuring Cholesterol, Triglyceride (TG) and Lactate dehydrogenase concentrations in COVID-19 patients. Objectives: The aim of this research is to see the correlation between Cholesterol, TG and Lactate dehydrogenase and the severity of coronavirus infection. Methods: This study is made at Al-Zahra Teaching Hospital during the period from March 2021 to July 2021 and it was performed on two groups: patients group that involved 30 samples (15 male and 15 female), age ranging from 18 to 84 years old and another group consisting of 30 individuals who were not infected with SARS-CoV-2. Results: Our findings show that the high value for markers under this study associated with coronavirus was detected in lactate dehydrogenase (5 0 5. 0 7 ± 2 6. 9 3 4 IU/l), (2 2 7. 8 3 ± 2 4. 6 6 0 Mg/dl) for TG and (2 2 7. 5 3 ± 1 9. 8 0 5 Mg/dl) for cholesterol. High concentration of cholesterol is shown in the age category between 54 and 64 years is represented as (487 Mg/dl and 502 Mg/dl), TG at ages 42, 54 and 64 years is represented as 497, 509 and 521 Mg/dl, Lactate dehydrogenase at ages 80–84 years that represented is as 739, 809 and 812 IU/l. According to physiological parameters which were elevated, a high concentration was observed in almost both sexes, as males were more affected than females when determining cholesterol at (500 Mg/dl), while females had more than males with respect to lactate dehydrogenase and TGs at (520 Mg/dl and 800 IU/l), respectively. In the correlation test, we found the highest significant differences, according to the correlation test, between cholesterol and lactate dehydrogenase at (1) cholesterol and TG at (0.000), TG and lactate dehydrogenase at (0.739). Conclusions: We conclude that COVID-19 patients suffer from increased markers under the studies on cholesterol, TG and lactate dehydrogenase. [ FROM AUTHOR] Copyright of Journal of Mechanics in Medicine & Biology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)