Expression of CD34 in endothelial cells, hematopoietic progenitors and nervous cells in fetal and adult mouse tissues

European Journal of Immunology
G LinJ C Gutierrez-Ramos

Abstract

The human cell surface molecule CD34 is selectively expressed on uncommitted and committed hematopoietic progenitor cells and on vascular endothelial cells. It has been suggested that CD34 regulates early events in blood cell migration and differentiation, possibly as a cell adhesion molecule. To characterize the patterns of expression of CD34 in the mouse embryo and in the adult, as well as to dissect the function of different portions of the extracellular domain of this molecule, we have generated the first monoclonal antibodies (mAb) specific for mouse CD34. The epitope(s) recognized by these mAb are not carbohydrate moieties, and are comprised either within the immunoglobulin-like domain or within a portion of the mucin domain, containing approximately half of the predicted O- and N-linked carbohydrate attachment sites. The specificity of the antibodies was established by ELISA and Western blotting. Western analysis revealed that these mAb recognize a protein of approximately 110 kDa in PA6 stromal cell lysates, which can be specifically blocked by the recombinant CD34 protein. To establish the reactivity of these mAb on different cell lineages, a panel of cell lines was stained. This analysis showed strong reactivities wit...Continue Reading

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