The Journal of Immunology, Vol 142, Issue 1 110-117, Copyright © 1989 by American Association of Immunologists

ARTICLES

Establishment of a leukemic cell model for studying human pre-B to B cell differentiation

B Wormann, JM Anderson, JA Liberty, K Gajl-Peczalska, RD Brunning, TL Silberman, DC Arthur and TW LeBien
Department of Laboratory Medicine/Pathology, University of Minnesota School of Medicine, Minneapolis 55455.

Reproducible models for examining early stages of human B cell differentiation are poorly developed. We now describe the establishment and characterization of a novel human leukemic cell line that recapitulates the pre-B to B cell stage of differentiation. This cell line, designated BLIN-1, was initially established in tissue culture medium containing low m.w. B cell growth factor, and consistently shows a dependency on this cytokine for optimal growth at low density. BLIN-1 cells have a 9p chromosomal abnormality, identical to the abnormality present in the leukemic blasts from the patient's original bone marrow aspirate. The immunologic phenotype of BLIN-1 is consistent with a cell arrested at the pre-B cell stage of development. Analysis of Ig gene rearrangement and Ig expression in a series of BLIN-1 subclones show that the cells spontaneously rearrange kappa light chain genes, leading to the differentiation of surface kappa-negative pre-B cells into surface kappa-positive B cells. The BLIN-1 cell line is, to our knowledge, the first defined human model for examining this critical developmental stage in human B cell ontogeny. As such, it offers a unique resource for examining variables influencing onset of kappa L chain gene rearrangement and expression.

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