Document Detail

Direct measurements on CD24-mediated rolling of human breast cancer MCF-7 cells on E-selectin.
MedLine Citation:
PMID:  21207944     Owner:  NLM     Status:  MEDLINE    
Tumor cell rolling on the endothelium plays a key role in the initial steps of cancer metastasis, i.e., extravasation of circulating tumor cells (CTCs). Identification of the ligands that induce the rolling of cells is thus critical to understanding how cancers metastasize. We have previously demonstrated that MCF-7 cells, human breast cancer cells, exhibit the rolling response selectively on E-selectin-immobilized surfaces. However, the ligand that induces rolling of MCF-7 cells on E-selectin has not yet been identified, as these cells lack commonly known E-selectin ligands. Here we report, for the first time to our knowledge, a set of quantitative and direct evidence demonstrating that CD24 expressed on MCF-7 cell membranes is responsible for rolling of the cells on E-selectin. The binding kinetics between CD24 and E-selectin was directly measured using surface plasmon resonance (SPR), which revealed that CD24 has a binding affinity against E-selectin (K(D) = 3.4 ± 0.7 nM). The involvement of CD24 in MCF-7 cell rolling was confirmed by the rolling behavior that was completely blocked when cells were treated with anti-CD24. A simulated study by flowing microspheres coated with CD24 onto E-selectin-immobilized surfaces further revealed that the binding is Ca(2+)-dependent. Additionally, we have found that actin filaments are involved in the CD24-mediated cell rolling, as observed by the decreased rolling velocities of the MCF-7 cells upon treatment with cytochalasin D (an inhibitor of actin-filament dynamics) and the stationary binding of CD24-coated microspheres (the lack of actins) on the E-selectin-immobilized slides. Given that CD24 is known to be directly related to enhanced invasiveness of cancer cells, our results imply that CD24-based cell rolling on E-selectin mediates, at least partially, cancer cell extravasation, resulting in metastasis.
Ja Hye Myung; Khyati A Gajjar; Ryan M Pearson; Cari A Launiere; David T Eddington; Seungpyo Hong
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-01-05
Journal Detail:
Title:  Analytical chemistry     Volume:  83     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-03-15     Completed Date:  2011-05-17     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1078-83     Citation Subset:  IM    
Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, Illinois 60612, USA.
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MeSH Terms
Antigens, CD24 / analysis*,  immunology
Cell Line, Tumor
E-Selectin / chemistry*,  immunology
Surface Plasmon Resonance
Grant Support
Reg. No./Substance:
0/Antigens, CD24; 0/E-Selectin

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