Relational interaction between T-lymphocytes and SARS-CoV-2: A review

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.