COVID-19 and myeloid cells: complex interplay correlates with lung severity

Area of Science:

• Immunology
• Infectious Diseases
• Respiratory Medicine

Background:

• COVID-19 presents diverse symptoms with significant immune system involvement.
• Understanding changes in immune cell subsets during COVID-19 progression and severity is crucial.
• The role of myeloid cells, particularly in lung inflammation resolution, requires investigation in COVID-19.

Purpose of the Study:

• To investigate the changes in dendritic cells (DCs) and monocytes in patients with varying COVID-19 severity.
• To determine if circulating monocytes and DCs migrate into inflamed lung tissues during COVID-19.

Main Methods:

• Analysis of DCs and monocytes from blood and bronchial secretions of COVID-19 patients and healthy controls.
• Comparison of immune cell populations across different disease severities.

Main Results:

• Circulating monocytes and DCs were identified in both blood and bronchial secretions of COVID-19 patients.
• Evidence suggests that these cells migrate from the bloodstream into the inflamed lung environment.

Conclusions:

• Monocytes and DCs play a role in the immune response within the lungs during COVID-19.
• Reprogramming these myeloid cells, potentially through immunometabolism or epigenetics, could offer therapeutic strategies for COVID-19-associated lung inflammation.