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    CBN ends free ATM withdrawals for other banks’customers

    FG increases private university application fee from N5m to N25m

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Home Opinion & Analysis Columnists

Study reveals what triggers lung damage during COVID-19

Tuesday, 10 August 2021, 11:02 am
in Columnists, Opinion & Analysis
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Study reveals what triggers lung damage during COVID-19
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A KAIST immunology research team found that a specific subtype of macrophages that originated from blood monocytes plays a key role in the hyper-inflammatory response in SARS-CoV-2 infected lungs, by performing single-cell RNA sequencing of bronchoalveolar lavage fluid cells. This study provides new insights for understanding dynamic changes in immune responses to COVID-19.

In the early phase of COVID-19, SARS-CoV-2 infected lung tissue and the immediate defence system is called ‘ innate immunity’, provided by immune cells residing in lungs. Macrophages are major cell types of the innate immune system of the lungs, and newly differentiated macrophages originating from the bloodstream also contribute to early defences against viruses.

Professor Su- Hyung Park and his Collaborators investigated the quantitative and qualitative evaluation of immune responses in the lungs of SARS-CoV-2 infected ferrets. To overcome the limitations of research using patients-originated specimens, the researchers used a ferret infected model to obtain SARS-CoV-2 infected lungs sequentially with a defined time interval.

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The researchers analyzed the 10 subtypes of macrophages during the five-day course of SARS-CoV-2 infection and found that infiltrating macrophages originating from activated monocytes in the blood were key players for viral clearance as well as damaged lung tissue. Moreover, they found that the differentiation process of these inflammatory macrophages resembles the immune responses in the lung tissue of severe COVID-19 patients.

Currently, the research team is conducting a follow-up study to identify the dynamic changes in immune responses during the use of immunosuppressive agents to control hyper-inflammatory responses called ‘cytokinestorm’ in patients with COVID-19.

Dr. Jeong Seok Lee, the chief medical officer at Genome Insight Inc., explained, “ Our analysis will enhance the understanding of the early features of COVID-19 immunity and provide a scientific background for the more precise use of immunosuppressive agents targeting specific macrophages subtypes”.

“ This study is the first longitudinal study using sequentially obtained immune cells originating from SARS-CoV-2 infected lungs. The research describes the innate immune response to COVID-19 using single-cell transcriptome data and enhances our understanding of the two phases of inflammatory responses”, Professor Park said.

By: Peace Chigozie

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