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. 2021 Mar 11;57(3):2002384.
doi: 10.1183/13993003.02384-2020. Print 2021 Mar.

Plasma mediators in patients with severe COVID-19 cause lung endothelial barrier failure

Affiliations

Plasma mediators in patients with severe COVID-19 cause lung endothelial barrier failure

Laura Michalick et al. Eur Respir J. .

Abstract

The plasma of COVID-19 patients induces pulmonary microvascular barrier failure, which increases with disease severity. Here, a screening platform to test for plasma mediators and the therapeutic potential of barrier stabilising compounds is reported. https://bit.ly/3k4C0tB

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Conflict of interest statement

Conflict of interest: S. Weidenfeld has nothing to disclose. Conflict of interest: B. Grimmer has nothing to disclose. Conflict of interest: D. Fatykhova has nothing to disclose. Conflict of interest: P.D. Solymosi has nothing to disclose. Conflict of interest: F. Behrens has nothing to disclose. Conflict of interest: M. Dohmen has nothing to disclose. Conflict of interest: M.C. Brack has nothing to disclose. Conflict of interest: S. Schulz has nothing to disclose. Conflict of interest: E. Thomasch has nothing to disclose. Conflict of interest: S. Simmons has nothing to disclose. Conflict of interest: H. Müller-Redetzky has nothing to disclose. Conflict of interest: N. Suttorp has nothing to disclose. Conflict of interest: F. Kurth has nothing to disclose. Conflict of interest: J. Neudecker has nothing to disclose. Conflict of interest: M. Toennies has nothing to disclose. Conflict of interest: T.T. Bauer has nothing to disclose. Conflict of interest: S. Eggeling has nothing to disclose. Conflict of interest: V.M. Corman has nothing to disclose. Conflict of interest: A.C. Hocke has nothing to disclose. Conflict of interest: M. Witzenrath reports grants and personal fees from Actelion, Bayer Health Care, Biotest, Boehringer Ingelheim, Noxxon, Pantherna, Silence Therapeutics and Vaxxilon, grants from Quark Pharma and Takeda Pharma, personal fees from Aptarion, AstraZeneca, Berlin Chemie, Chiesi, GlaxoSmithKline, Novartis, Sinoxa and Teva, outside the submitted work; and has a patent “Means for inhibiting the expression of ANG2 US8829179B2” issued. Conflict of interest: S. Hippenstiel has nothing to disclose. Conflict of interest: W.M. Kuebler reports grants from Ministry of Education and Research (BMBF), German Research Foundation (DFG), German Centre for Cardiovascular Research (DZHK) and Canadian Institutes for Health Resarch (CIHR), during the conduct of the study. Conflict of interest: L. Michalick has nothing to disclose.

Figures

FIGURE 1
FIGURE 1
Plasma of coronavirus disease 2019 (COVID-19) patients induces endothelial barrier failure. a) Barrier integrity of pulmonary microvascular endothelial cell monolayers assessed by electric cell impedance sensing (ECIS) in response to stimulation with 10% (v/v) plasma (at t=0 h) of healthy controls (number of samples/donors: 17/14), and moderate (25/14) or severe (22/16) COVID-19 patients. In cases of multiple samples from the same patient these were obtained at different time-points. Data are normalised to mean endothelial cell (EC) resistance in healthy donors. b) Trans-endothelial electrical resistance (TEER) response of EC monolayers to stimulation with 10% (v/v) plasma (at t=0 h) of healthy controls (7/7), and moderate (4/4), or severe (8/7) COVID-19 patients, with medium control and platelet activating factor as negative and positive controls. c) Representative immunofluorescence images of EC monolayers treated for 6 h with 10% (v/v) plasma of either healthy donors or severe COVID-19 patients stained for (left) VE-cadherin (cyan) or (centre) F-actin (green). Nuclei are shown in blue (DAPI). Gap area per cell (white in F-actin images) was identified by an automated segmentation algorithm (selecting pixels with zero values in both the F-Actin and VE-cadherin channel) using Fiji/MorpholibJ-Plugin, and was quantified for EC monolayers treated with plasma from healthy donors (7/7) or severe COVID-19 patients (7/7) (right). d) Representative western blots and quantification of VE-cadherin and occludin protein levels (normalised to healthy donors) in human lung samples from five donors treated for 24 h with plasma of three healthy donors or five severe COVID-19 patients. *: p≤0.05.

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