期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 14, 期 10, 页码 20809-20819出版社
MDPI
DOI: 10.3390/ijms141020809
关键词
cell adhesion; cell surface; cytoskeleton; microvilli; immuno-electron microscopy; SEM; correlative microscopy; correlative light and electron microscopy (CLEM); ASEM
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Grants-in-Aid for Scientific Research [24570154] Funding Source: KAKEN
The adhesion of leukocytes circulating in the blood to vascular endothelium is critical for their trafficking in the vasculature, and CD44 is an important cell surface receptor for rolling adhesion. In this study, we demonstrate the correlative observation of CD44 distribution at the lymphocyte cell surface in liquid by fluorescence optical microscopy and immuno-electron microscopy using an atmospheric scanning electron microscope (ASEM). The ultrastructure of the cell surface was clearly imaged by ASEM using positively charged Nanogold particles. ASEM analysis demonstrated microvilli projections around the cell surface and the localization of CD44 on the microvilli. Treatment of cells with cytochalasin D resulted in a loss of the microvilli projections and concomitantly abrogated CD44-mediated adhesion to its ligand hyaluronan. These results suggest the functional relevance of microvilli in CD44-mediated rolling adhesion under shear flow.
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