Microfluidics-based super-resolution microscopy enables nanoscopic characterization of blood stem cell rolling
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Type
ArticleAuthors
AbuZineh, Karmen
Joudeh, Luay

Al Alwan, Bader

Hamdan, Samir

Merzaban, Jasmeen

Habuchi, Satoshi

KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionBioscience Program
Laboratory of DNA Replication and Recombination
Single-Molecule Spectroscopy and Microscopy Research Group
KAUST Grant Number
CRG R2 13 MERZ KAUST 1Date
2018-07-18Online Publication Date
2018-07-18Print Publication Date
2018-07Permanent link to this record
http://hdl.handle.net/10754/630237
Metadata
Show full item recordAbstract
Hematopoietic stem/progenitor cell (HSPC) homing occurs via cell adhesion mediated by spatiotemporally organized ligand-receptor interactions. Although molecules and biological processes involved in this multistep cellular interaction with endothelium have been studied extensively, molecular mechanisms of this process, in particular the nanoscale spatiotemporal behavior of ligand-receptor interactions and their role in the cellular interaction, remain elusive. We introduce a microfluidics-based super-resolution fluorescence imaging platform and apply the method to investigate the initial essential step in the homing, tethering, and rolling of HSPCs under external shear stress that is mediated by selectins, expressed on endothelium, with selectin ligands (that is, CD44) expressed on HSPCs. Our new method reveals transient nanoscale reorganization of CD44 clusters during cell rolling on E-selectin. We demonstrate that this mechanical force-induced reorganization is accompanied by a large structural reorganization of actin cytoskeleton. The CD44 clusters were partly disrupted by disrupting lipid rafts. The spatial reorganization of CD44 and actin cytoskeleton was not observed for the lipid raft-disrupted cells, demonstrating the essential role of the spatial clustering of CD44 on its reorganization during cell rolling. The lipid raft disruption causes faster and unstable cell rolling on E-selectin compared with the intact cells. Together, our results demonstrate that the spatial reorganization of CD44 and actin cytoskeleton is the result of concerted effect of E-selectin-ligand interactions, external shear stress, and spatial clustering of the selectin ligands, and has significant effect on the tethering/rolling step in HSPC homing. Our new experimental platform provides a foundation for characterizing complicated HSPC homing.Citation
AbuZineh K, Joudeh LI, Al Alwan B, Hamdan SM, Merzaban JS, et al. (2018) Microfluidics-based super-resolution microscopy enables nanoscopic characterization of blood stem cell rolling. Science Advances 4: eaat5304. Available: http://dx.doi.org/10.1126/sciadv.aat5304.Sponsors
Acknowledgments: We thank M. Abadi for technical support during the 3D and two-color SR microscopy experiments. We also thank D. AbuSamra, M. Mih, K. Sakashita, A. Ali, A. Khodairi, F. Aleisa, and A. Amoodi for their contributions to this work. We thank V. Unkefer for editing the manuscript. Figure S1 was based on a figure previously created in a joint effort with E. Mikhaylova [King Abdullah University of Science and Technology (KAUST)] and modified by J. Merzaban and S. Habuchi. Funding: The research reported in this publication was supported by funding from the King Abdullah University of Science and Technology (KAUST) and the KAUST Office of Sponsored Research under Award No. CRG R2 13 MERZ KAUST 1.Journal
Science AdvancesAdditional Links
http://advances.sciencemag.org/content/4/7/eaat5304ae974a485f413a2113503eed53cd6c53
10.1126/sciadv.aat5304
Scopus Count
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