Abstract
Histo-blood group antigens CD173 (H2) and CD174 (Lewis Y) are known to be developmentally regulated carbohydrate antigens which are expressed to a varying degree on many human carcinomas. We hypothesized that they might represent markers of cancer-initiating cells (or cancer stem cells, CSC). In order to test this hypothesis, we examined the co-expression of CD173 and CD174 with stem cell markers CD44 and CD133 by flow cytometry analysis, immunocytochemistry, and immunohistochemistry on cell lines and tissue sections from breast cancer. In three breast cancer cell lines, the percentage of CD173+/CD44+ cells ranged from 17% to >60% and of CD174+/CD44+ from 21% to 57%. In breast cancer tissue sections from 15 patients, up to 50% of tumor cells simultaneously expressed CD173, CD174, and CD44 antigens. Co-expression of CD173 and CD174 with CD133 was also observed, but to a lesser percentage. Co-immunoprecipitation and sandwich ELISA experiments on breast cancer cell lines suggested that CD173 and CD174 are carried on the CD44 molecule. The results show that in these tissues CD173 (H2) and CD174 (LeY) are associated with CD44 expression, suggesting that these carbohydrate antigens are markers of cancer-initiating cells or of early progenitors of breast carcinomas.
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Acknowledgments
We thank the First Affiliated Hospital of Kunming Medical College for providing patient samples and gratefully acknowledge the technical assistance of Ms. Fan Xiao-Na. This research was supported by a grant from Yunnan Province Science and Technology Department (2008CCO15).
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UK and SG are employees of Glycotope GmbH.
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Lin, WM., Karsten, U., Goletz, S. et al. Co-expression of CD173 (H2) and CD174 (Lewis Y) with CD44 suggests that fucosylated histo-blood group antigens are markers of breast cancer-initiating cells. Virchows Arch 456, 403–409 (2010). https://doi.org/10.1007/s00428-010-0897-5
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DOI: https://doi.org/10.1007/s00428-010-0897-5