Abstract
A novel cell line, designated KIS‐1, was established from a patient with Ki‐1‐positive diffuse large cell lymphoma. Multiple phenotypic analysis of the KIS‐1 cells was carried out with a total of 22 monoclonal antibodies defining hematopoietic cell subsets and lineages. The KIS‐1 cells were positive for Ki‐1, B4, HLA‐DR, and 2D1 (common leucocyte) antigens, but were negative for the antigens reportedly specific for T cells, natural killer cells, granulocytes, monocytes, interdigitating reticulum cells and dendritic reticulum cells. The genomic analysis of the KIS‐1 cells showed not only the rearrangement of JH and Jk genes but also the probable rearrangement of Cγ genes. Moreover, the cells produced immunoglobulin γ chains. Thus, KIS‐1 was considered to be of B‐cell lineage. The lymphoma‐cell derivation of KIS‐1 was based on the following facts. The cytochemical, immunologic, cytogenetic properties and the results of the molecular genomic analysis in the KIS‐1 cells were essentially the same as those of the original tumor cells, and the KIS‐1 cells were negative for Epstein‐Barr virus‐associated nuclear antigen. KIS‐1 is the only known B‐cell line derived from Ki‐1‐positive diffuse large cell lymphoma, and should be useful for defining the biological implications of Ki‐1 antigen.
Keywords: Ki‐1 antigen, B‐cell line, Malignant lymphoma
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