A new monoclonal antibody specific for human pre-B cell leukemia/lymphoma.

Abstract

A new monoclonal antibody, designated WH14 antibody (WH14 Ab), was produced by using non-T ALL cell line (HBL-3 cell line) se an immunogen.HBL-3 cell line showed characteristics of the earliest B cell committed to B cell lineage [SIg-, CIg-. TdT+, Ia+, B4 (CD19)+, B1 (CD20)-, J5 (CD10-, IgHR, TcRG], HBL-3 cell line, according to the Nadler's or Foon's classification of non-T ALL, was representative for a pre-B cell of the Stage II.SDS-PAGE analysis of immunoprecipitates and Western blotting analysis revealed that the antigen reacting with WH14 was of molecule of 30, 000 daltons, Immunoglobulin isotype of WH14 Ab was IgGl.In the normal hematopoietic tissue, the WH14 Ab reacted with a small numbar of monocytes (<30%) and granulocytes (<2%) in the peripheral blood, but neither with lymphocytes in the lymph nodes and tonsils nor thymocytes in the thymus.WH14 Ab reacted with Non-T non-B cell ALL cell lines (REH) and pre-B cell line (HBL-3), but not with other B-cell leukemia/Iymphoma cell lines and EBV-transformed B cell lines.In addition, the WH14 Ab reactd with most non-T ALLs and B lymphoblastic lymphomas (SIg-, B4+, J5+) corresponding to pre-B cellderived neoplasm and some medium-sized cell lymphoma derived from intermediate-B cell, but not with other B-cell lymphoma.WH14 Ab didn't react with all T-cell lymphomas including ATLL. These findings indicated that the WH14 Ab might recognize the cell surface determinant shared by immature B cells, especially pre-B eclls in the B-cell lineage.WH14 Ab is useful for the study to analysis the characterization and difference of B cells in immature stage.