title: JM, a Thy-ALL cell line produces both inhibitory and stimulatory lymphokines for bone marrow progenitor cells.
abstract: Normal and malignant T cells as well as T-cell hybridomas have frequently been reported to produce factors which stimulate the growth of committed hemopoietic progenitors. One previous report described a lymphokine produced by a T-cell clone which inhibited hemopoietic progenitor cell proliferation. We now describe the simultaneous production of two activities by a Thy-ALL cell line (JM), a sub-line of Jurkat. Two sets of culture conditions were used: the Fauser & Messner and Iscove's assays. We have been able to separate both inhibitory and stimulatory factors for the growth of multipotent and committed bone marrow progenitors (CFU-GEMM, BFU-E, CFU-E and CFU-GM). The stimulatory factor has an apparent mol. wt of less than 30,000 and the inhibitor an apparent mol. wt of 65-80,000. The growth promoting activity for BFU-E and CFU-GEMM could replace that of phytohemagglutinin stimulated leucocyte conditioned medium (PHA-LCM). We do not know if the production of both activities is due to the malignant phenotype or if there is a normal counterpart to JM that could produce both inhibitory and stimulatory factors.
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D001853:Bone Marrow / Q000473:pathology; D002460:Cell Line; D003114:Colony-Forming Units Assay; D006412:Hematopoietic Stem Cells / Q000187:drug effects* / Q000473:pathology; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology / Q000473:pathology*; D008222:Lymphokines / Q000378:metabolism*; D010641:Phenotype; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism* / Q000473:pathology
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D008222:Lymphokines