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Relational interaction between T-lymphocytes and SARS-CoV-2: A review
Insights
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) significantly impacts T-lymphocytes, affecting immune response and disease severity in COVID-19 patients. Understanding this interaction is crucial for developing effective treatments and vaccines.
Area of Science:
- Immunology
- Virology
- Infectious Diseases
Background:
- Coronavirus disease 2019 (COVID-19), caused by SARS-CoV-2, presents a global health crisis with varied clinical manifestations.
- The immune system's response, particularly T-lymphocyte activity, plays a critical role in COVID-19 pathogenesis and outcomes.
- Uncontrolled cytokine release can lead to systemic inflammation and severe, life-threatening illness.
Purpose of the Study:
- To review the intricate interactions between SARS-CoV-2 and T-lymphocytes.
- To elucidate the impact of SARS-CoV-2 infection on different T-cell populations (CD4+, CD8+, Treg).
- To highlight the significance of T-cell responses in COVID-19 pathogenesis and antiviral defense.
Main Methods:
- Literature review focusing on studies investigating T-lymphocyte dynamics during SARS-CoV-2 infection.
- Analysis of data on changes in T-cell counts and ratios (CD4+/CD8+, Treg/Th17) in COVID-19 patients.
- Examination of T-cell functional exhaustion and its correlation with disease severity.
Main Results:
- SARS-CoV-2 infection leads to a profound decrease in CD4+ T, CD8+ T, and Treg cells in severe cases.
- The virus alters critical T-cell ratios and induces functional exhaustion, impairing antiviral immunity.
- T-lymphocytes are central to both the pathogenesis of severe COVID-19 and the body's defense against the virus.
Conclusions:
- T-lymphocyte dysregulation is a key feature of severe COVID-19.
- Targeting T-cell responses could lead to novel antiviral strategies and improved vaccine development.
- Further understanding of T-cell interactions with SARS-CoV-2 is essential for managing the pandemic.
Abstract:
Coronavirus disease 2019 (COVID-19) has turned out as one of the worst medical and economic misfortunes across the globe. The etiological agent, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a member of the Coronaviridae family and represents a disease manifestation from asymptomatic to severe respiratory damage. High transmissibility and contagious nature of the virus helps it to flourish in a large population. The immune system aids to retain the virus, but with accelerated cytokine secretion, it could transform into double edge sword resulting in unrestrained systemic inflammation which might become life-threatening. SARS-CoV-2 sets substantial impact on T-lymphocytes during its course of infection. The number of CD4+ T, CD8+ T, and Treg cells tend to decrease profoundly in case of severe illness. Besides, the virus modulates the CD4+ T/ CD8+ T and Treg/Th17 cells ratio and induces the functional exhaustion of T cells to make them inefficient. T cells define the pathogenesis of severe cases and provide major contributions in antiviral defense. Therefore, the apprehension of T-lymphocytes in SARS-CoV-2 infection would implicate in developing antivirals, disease control, and would broaden the way for vaccine formulation. Thus, the review depicts the significance of T-lymphocytes interaction with SARS-CoV-2. Keywords: SARS-CoV-2; COVID-19; T-lymphocytes; cytokine; inflammation; immune response.
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