Michalevicz R, Taheri MR, Katz FE, Blacklock HA, Ivory KI, Hoffbrand VA. JM, a Thy-ALL cell line produces both inhibitory and stimulatory lymphokines for bone marrow progenitor cells.
Leuk Res 1987;
11:649-54. [PMID:
3112472 DOI:
10.1016/0145-2126(87)90038-5]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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.
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