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Author Spotlight: Advancing Immune Monitoring in Critical Care Patients Using Whole Blood Assays

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CoViD-19 Immunopathology and Immunotherapy.

Francesco Chiappelli¹, Allen Khakshooy², Gillian Greenberg²

¹Professor Emeritus, UCLA, Center for the Health Sciences, Los Angeles, CA, USA.

|April 21, 2020

Summary

New research reveals T-cell exhaustion in COVID-19 patients, characterized by decreased CD4+ and CD8+ T cells and increased inflammatory cytokines. This immune pathology suggests potential therapeutic targets for COVID-19 treatment.

Keywords:

Corona Virus Disease 2019 (CoViD-19)T cell exhaustion (Tex) markers, programmed cell death marker 1 (CD279 - PD-1)T cell immunoglobulin and mucin domain-3 (CD366 - Tim-3)clinical trials cytokine storm

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Area of Science:

Immunology
Virology
Pathology

Background:

COVID-19 is a viral disease with significant immune system involvement.
Understanding T-cell responses is crucial for managing severe COVID-19.
Previous studies have indicated immune dysregulation in COVID-19 patients.

Purpose of the Study:

To interpret new evidence on T-cell immunopathology in COVID-19 patients.
To emphasize the role of T-cell exhaustion (Tex) in COVID-19.
To discuss potential immunotherapies for COVID-19 based on T-cell responses.

Main Methods:

Analysis of flow cytometry data from 522 COVID-19 patients and 40 controls.
Measurement of CD4+ and CD8+ T-cell populations.
Assessment of serum cytokine levels (IL-6, IL-10, TNF-a) and T-cell exhaustion markers (PD-1, Tim-3).

Main Results:

Significant T-cell cytopenia (decrease in CD4+ and CD8+ T cells) was observed.
T-cell cytopenia inversely correlated with elevated pro-inflammatory cytokines.
Increased expression of PD-1 and Tim-3 indicated T-cell exhaustion in severe cases.

Conclusions:

The findings suggest T-cell exhaustion is a key feature of COVID-19 immunopathology.
Targeting T-cell exhaustion may offer a novel therapeutic strategy for COVID-19.
Further research into T-cell-based immunotherapies for COVID-19 is warranted.