Abstract
Endothelial surface glycocalyx (ESG) is a carbohydrate-rich, gel-like layer found on vascular endothelium, serving critical functions in mechanotransduction of blood flows, maintenance of the endothelial permeability, and the control of leukocyte adhesion and inflammation. This study aimed to clarify the role of ESG in the adhesion between leukocytes and Human Umbilical Vein Endothelial Cells (HUVECs) under resting or inflammatory conditions. Using an atomic force microscopy-based single-cell adhesion assay, we directly quantified the detachment force and work perpendicular to the cell membrane. Detachment force and work were measured for every separation event of a leukocyte from a HUVEC with ESG, or with the major ESG glycosaminoglycan components, heparan sulfate (HS) and hyaluronic acid (HA) removed. For the resting HUVECs, when HS and/or HA were removed, the detachment force and work increased dramatically. For the HUVECs activated by inflammatory cytokine tumor necrosis factor alpha, we observed increases in the detachment force and work compared to the resting HUVECs, and removal of HS and/or HA resulted in significant decreases in the detachment force and work. The results demonstrate that the ESG layer serves a dual function: (1) on resting endothelium, it prevents leukocyte adhesion, and (2) under inflammatory conditions, it participates in endothelial-leukocyte interactions with molecules such as selectins.
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Acknowledgments
This work was supported in part by Lehigh University scholarship to M.A.D, Lehigh University Grants for Experiential Learning in Health to K.G., and an American Heart Association grant (11SDG5420008), and start-up funding from Lehigh University to X.F.Z. The authors also wish to thank Dr. Bingmei Fu and Dr. John Tarbell of CUNY for their insightful discussions of the experimental design.
Conflict of interest
Authors Matthew Dragovich, Kaylynn Genemaras, Hannah L. Dailey and Sabrina Jedlicka have no conflicts of interest to disclose. Author X. Frank Zhang has received funding from the American Heart Association (11SDG5420008) and Lehigh University (start-up funding) to conduct the research.
Ethical Statement
Professors Zhang, Dailey, Jedlicka and Matthew Dragovich have no personal, professional or financial conflicts of interest in this project and/or proposal. We have conducted no research on human subjects, live or dead vertebrate animal subjects and our laboratories have accommodations for safe practice: Gloves, hoods, autoclaves, sterile equipment, proper refrigeration, etc.…. All data acquisition for the applied force and work was gathered and analyzed in Igor; the figures seen in this paper of the AFM force-extension curves are renditions of the raw data gathered from Igor and are displayed in Origin. The Box and whiskers plots of the analyzed data are displayed in Excel. The equipment is owned by Professor Zhang and was purchased with his funding from Lehigh University. The equipment used in this project is managed by Mr. Dragovich with further oversight from Professor Zhang. Mr. Dragovich was responsible for gathering and analyzing the cell–cell adhesion data. The equipment in this project was also under use by the then undergraduate researcher Kaylynn Genemaras who was managed by Mr. Dragovich and assisted Mr. Dragovich in gathering and analyzing the cell–cell adhesion data. The AFM was previously used in collaboration with several other groups as well. Professor Dailey provided the statistical analysis for this project which is displayed in the figures and the appendix. Professor Jedlicka aided in providing the antibody staining images. The assertion that any publications from this project make will be handled appropriately so author integrity will be maintained. The data is presented with the expectation that it will be made public to accept challenges and/or corroborations. Since these findings may influence health care and be used by other scientific researchers they will particularly be handled with the upmost ethical responsibility. Intellectual property gained during this study from all participating in this project will be handled through the appropriate channels to be sure that appropriate credits and rights are obtained.
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Dragovich, M.A., Genemaras, K., Dailey, H.L. et al. Dual Regulation of L-Selectin-Mediated Leukocyte Adhesion by Endothelial Surface Glycocalyx. Cel. Mol. Bioeng. 10, 102–113 (2017). https://doi.org/10.1007/s12195-016-0463-6
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DOI: https://doi.org/10.1007/s12195-016-0463-6