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Role of interleukin 6 and its soluble receptor on the diffusion barrier dysfunction of alveolar tissue

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Abstract

During respiratory infection, barrier dysfunction in alveolar tissue can result from “cytokine storm” caused by overly reactive immune response. Particularly, interleukin 6 (IL-6) is implicated as a key biomarker of cytokine storm responsible for and further progression to pulmonary edema. In this study, alveolar-like tissue was reconstructed in a microfluidic device with: (1) human microvascular lung endothelial cells (HULEC-5a) cultured under flow-induced shear stress and (2) human epithelial cells (Calu-3) cultured at air–liquid interface. The effects of IL-6 and the soluble form of its receptor (sIL-6R) on the permeability, electrical resistance, and morphology of the endothelial and epithelial layers were evaluated. The diffusion barrier properties of both the endothelial and epithelial layers were significantly degraded only when IL-6 treatment was combined with sIL-6R. As suggested by recent review and clinical studies, our results provide unequivocal evidence that the barrier dysfunction occurs through trans-signaling in which IL-6 and sIL-6R form a complex and then bind to the surface of endothelial and epithelial cells, but not by classical signaling in which IL-6 binds to membrane-expressed IL-6 receptor. This finding suggests that the role of both IL-6 and sIL-6R should be considered as important biomarkers in developing strategies for treating cytokine storm.

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The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Information files. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.

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Acknowledgements

This project has been funded by a grant from New Jersey Health Foundation.

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Chao Sui wrote the main manuscript text and prepared all figures; All authors reviewed the manuscript, but Woo Lee is the main person who revised the manuscript and organized the figures. Chao Sui revised the format.

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Correspondence to Woo Lee.

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Sui, C., Lee, W. Role of interleukin 6 and its soluble receptor on the diffusion barrier dysfunction of alveolar tissue. Biomed Microdevices 25, 40 (2023). https://doi.org/10.1007/s10544-023-00680-0

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  • DOI: https://doi.org/10.1007/s10544-023-00680-0

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