title: Characterization of a novel HTLV-infected cell line.
abstract: A man from Chile developed an aggressive mature T cell leukemia associated with marked eosinophilia. The neoplastic lymphocytes were of T helper surface phenotype, and they expressed the p24 and p19 antigens of human T cell leukemia virus (HTLV). A cell line (ME) was established from the patient's peripheral blood cells that was initially composed of eosinophils and T and B lymphocytes. The B lymphocytes of the cell line are polyclonal and contain Epstein-Barr virus (EBV) DNA. Many of the T lymphocytes, a few of the B lymphocytes, and none of the eosinophils express HTLV p19 and p24 antigens. By 6 months of culture, the ME line no longer contained eosinophils. A variant line of ME was established; this variant (ME-2) is notable because the cells (greater than 80%) adhere tightly to the bottom of the culture flask; they do not express T lymphocyte markers, but 30% of the cells contain cytoplasmic mu heavy immunoglobulin chains. These pre-B and null lymphocytes contain p19 and p24 antigens (80% of cells), have the HTLV-I genome, and are able to transform normal T lymphocytes in vitro. We isolated a B lymphocyte clone (11A) from ME that expresses cytoplasmic immunoglobulin (70% of cells) and p19 and p24 antigens (75% of cells), contains the EBV and HTLV genomes, and can transform T lymphocytes from normal volunteers. These data show that B lymphocytes can be infected with HTLV, although no disease of HTLV-infected B lymphocytes has been reported. The T lymphocytes from normal adult peripheral blood were easily immortalized (about 70% efficiency) by cocultivation with lethally irradiated ME cells. Twenty-five of 27 of the transformant lines were composed of T lymphocytes with helper antigens, and two of the lines were of T suppressor antigen phenotype. All the cell lines that were tested constitutively produce lymphokines, including colony-stimulating factor (CSF), erythroid-potentiating activity (EPA), macrophage migration-inhibitory factory (MIF), neutrophil-inhibitory factor (NIF), and differentiation-inducing factor (DIF).
mesh_terms: D000328:Adult; D000956:Antigens, Viral / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology / Q000473:pathology; D002460:Cell Line; D002472:Cell Transformation, Viral; D002999:Clone Cells; D004279:DNA, Viral / Q000032:analysis; D017977:Deltaretrovirus / Q000235:genetics / Q000276:immunology / Q000648:ultrastructure; D006801:Humans; D007938:Leukemia / Q000276:immunology / Q000473:pathology*; D008222:Lymphokines / Q000096:biosynthesis; D008297:Male; D013601:T-Lymphocytes / Q000276:immunology / Q000473:pathology / Q000648:ultrastructure
chemical_list: D000956:Antigens, Viral; D004279:DNA, Viral; D008222:Lymphokines