Abstract
The aim of this study was to explore whether Thy-1, like other members of the Ig-like superfamily (e.g., CD2 and neural cell adhesion molecule), participates in cell-cell adhesion. This was investigated by measuring the binding of Thy-1+ probe cells (thymocytes or AKR1 T lymphoma cells) to Thy-1- cloned mouse thymic epithelial (MTE) cells using a quantitative cell adhesion assay. The results were as follows: (a) the thymo-epithelial cell interaction was found to be inhibitable (by 25-40%) by soluble Thy-1 molecules purified from phosphatidylinositol-specific phospholipase C-treated mouse thymocytes as well as by Fab' fragments of a Thy-1-specific mAb; (b) the binding of the Thy-1- AKR1 (Thy-1-d) mutant to MTE cells was found to be reduced (by 50%) as compared with that of the wild type T lymphoma; (c) the Thy-1-mediated adhesion pathway did not require Ca2+ and promoted the initial thymo-epithelial binding measured at 4 degrees C. These data provide the first direct evidence of an adhesive function of Thy-1 and suggest that this molecule, in addition to its T cell triggering properties, might play a role during the early T cell maturation by promoting thymocyte adhesion to thymic stroma.
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Selected References
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- Edelman G. M. Morphoregulatory molecules. Biochemistry. 1988 May 17;27(10):3533–3543. doi: 10.1021/bi00410a001. [DOI] [PubMed] [Google Scholar]
- Lotz M. M., Burdsal C. A., Erickson H. P., McClay D. R. Cell adhesion to fibronectin and tenascin: quantitative measurements of initial binding and subsequent strengthening response. J Cell Biol. 1989 Oct;109(4 Pt 1):1795–1805. doi: 10.1083/jcb.109.4.1795. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Vollger L. W., Tuck D. T., Springer T. A., Haynes B. F., Singer K. H. Thymocyte binding to human thymic epithelial cells is inhibited by monoclonal antibodies to CD-2 and LFA-3 antigens. J Immunol. 1987 Jan 15;138(2):358–363. [PubMed] [Google Scholar]