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- W2006303985 abstract "To further characterize a human B-cell growth factor (BCGF) produced by phytohemagglutinin (PHA) P-stimulated peripheral blood T cells, a partially purified preparation of this material was tested in a number of murine assays for B-cell stimulatory factors (BSF). Human BCGF lacked murine BSF-1 activity as assessed via the induction of polyclonal proliferation of antiIgM-stimulated murine B cells; however, this material consistently augmented the proliferative response of murine B cells to anti-IgM and a saturating dose of murine BSF-1. Human BCGF also induced proliferation in unstimulated murine B cells, and augmented the proliferative response of dextran sulfate activated murine B cells. Human BCGF is therefore capable of causing proliferation of unstimulated and activated murine B cells, and by these criteria closely resembles murine BCGF II. In contrast to murine BCGF II, however, human BCGF failed to stimulate proliferation or immunoglobulin (Ig) secretion by murine BCL1 B lymphoma cells. A murine analog of this human BCGF showing the same pattern of biological responses was found in concanavalin A-stimulated supernatants of the murine MB2.1 T-cell line and D9-Cl T-cell hybridoma. The active component of the human BCGF preparation was not due to contaminating PHA, interleukin 1, interleukin 2; interferon-γ, or endotoxin. Comparison between the above human BCGF and a commonly used source of murine BCGF II i.e., supernatant from antigen-stimulated D10.G4.1 T cells, provided information suggestive of BCGF II heterogeneity. Both human BCGF and D10.G4.1 supernatant caused proliferation of unstimulated and dextran sulfate-stimulated murine B cells; however, only the human BCGF preparation augmented the proliferative response of murine B cells to anti-IgM and a saturating dose of murine BSF-1, and only the D10.G4.1 supernatant stimulated BCL1 cell proliferation and immunoglobulin secretion. The data therefore indicate that the different assays for BCGF II used in this study respond to different factors, and suggest the existence of two BCGF II-like activities." @default.
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- W2006303985 title "Mitogenic lymphokine production in vitro and in vivo" @default.
- W2006303985 doi "https://doi.org/10.1016/0008-8749(76)90312-9" @default.
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