title: Expression of sialosyl-Tn in colony-forming unit-erythroid, erythroblasts, B cells, and a subset of CD4+ cells.
abstract: The epitopes Tn and sialosyl-Tn are expressed on erythrocytes of individuals with a very rare blood group, who often suffer from "Tn syndrome." We surveyed expression of Tn and sialosyl-Tn in normal blood cells, malignant transformed cells, and progenitor stem cells from bone marrow (BM). An anti-Tn antibody, IE3, and an anti-sialosyl-Tn antibody, TKH2, were used in this study. TKH2 reacted with erythroblasts, B cells, and a subset of CD4+ cells; but not with erythrocytes. Erythroblastic cell lines (K562, HEL, and UT7/EPO) and B-cell lines (Daudi, Raji, and B-cell lines transformed by Epstein-Barr virus) showed reactivity to TKH2. Similar results from the reactivity of TKH2 with transformed cells from leukemia patients and lymphoma patients were obtained; TKH2 reacted with blasts from erythroleukemia (M6; for 4 of 4 cases) and with lymphocytes from B-cell chronic lymphocytic leukemia (3 of 3), B-cell lymphoma (5 of 5), and CD4+ adult T-cell leukemia (4 of 4), but did not react with blasts from acute myeloid leukemia (M0 to M5; 0 of 22) or acute lymphoid leukemia (B-lymphoid leukemia, 0 of 11; T-lymphoid leukemia, 0 of 2; undifferentiated leukemia, 0 of 1). IE3 did not react with all of the tested cells. CD2-CD19-TKH2+ normal BM cells (BMC) contained blasts and various maturation stages of erythroblasts. The TKH2+ cells produced a large number of colony-forming unit-erythroid (CFU-E) colonies, whereas they produced a small number of burst-forming unit-erythroid colonies and CFU-granulocyte-macrophage colonies. CD34+ normal BMC did not express Tn and sialosyl-Tn. These findings suggest that sialosyl-Tn expresses in CFU-E to erythroblasts.
authors.affiliation: Department of Medicine, Jichi Medical School, Tochigi-Ken, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Muroi
authors.forename: T
authors.initials: T
authors.lastname: Suda
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: S
authors.initials: S
authors.lastname: Okada
authors.forename: H
authors.initials: H
authors.lastname: Nojiri
authors.forename: Y
authors.initials: Y
authors.lastname: Amemiya
authors.forename: Y
authors.initials: Y
authors.lastname: Miura
authors.forename: S
authors.initials: S
authors.lastname: Hakomori
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D015703:Antigens, CD / Q000032:analysis; D000944:Antigens, Differentiation, B-Lymphocyte / Q000032:analysis; D015295:Antigens, Tumor-Associated, Carbohydrate / Q000032:analysis*; D001402:B-Lymphocytes / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D015815:Cell Adhesion Molecules; D002460:Cell Line; D004900:Erythroblasts / Q000276:immunology; D015672:Erythroid Precursor Cells / Q000276:immunology*; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D006801:Humans; D037102:Lectins; D051918:Sialic Acid Binding Ig-like Lectin 2
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D015295:Antigens, Tumor-Associated, Carbohydrate; C497867:CD22 protein, human; D015815:Cell Adhesion Molecules; D037102:Lectins; D051918:Sialic Acid Binding Ig-like Lectin 2; C040286:Tn antigen; C055491:sialosyl-Tn antigen