0000000000116610
AUTHOR
Hans-georg Fischer
Differentiation driven by granulocyte-macrophage colony-stimulating factor endows microglia with interferon-γ-independent antigen presentation function
The antigen presentation function of microglial cells was analyzed after differentiation in neonatal mouse brain cell cultures supplemented either with macrophage (M) or granulocyte/macrophage (GM) colony-stimulating factor (CSF). The cells separated from concomitant astrocytes in both culture systems turned out to exhibit cytological characteristics of macrophages and bore MAC-1 and F4/80 markers in a similar way. When comparatively tested for accessory cell function, only microglia developed with GM-CSF were able to efficiently induce antigen-directed proliferation of a series of helper T cell lines representing both the TH1 and TH2 subtype. Antigenic T cell activation by this microglia p…
Granulocyte-macrophage colony-stimulating factor-cultured bone marrow-derived macrophages reveal accessory cell function and synthesis of MHC class II determinants in the absence of external stimuli.
The antigen-mediated activation of a number of T cell clones by bone marrow (BM) cells cultivated in the presence of various colony-stimulating factor (CSF) preparations was investigated. BM macrophages (BMM phi) grown in L929 cell supernatant as a crude source of macrophage colony-stimulating factor (M-CSF) as well as BM cells propagated in the presence of recombinant M-CSF exhibited transient antigen presentation potential to some T cell clones, being maximal on day 7 and having declined to a low level by day 19 of in vitro culture. Treatment of these long-term-cultivated BMM phi populations with recombinant interferon-gamma (IFN-gamma) resulted in predominant antigen presentation capacit…
Establishment of different T cell sublines using either interleukin 2 or interleukin 4 as growth factors
Purified protein derivative reactive T cell lines were established under identical conditions with the exception that different lymphokines, namely interleukin (IL) 2 and IL 4 were employed as growth factors. IL 2 favored the development of T cell lines (LNC.2) which upon activation by concanavalin A (Con A) secreted predominantly lymphokines characteristic of TH1 cells. By contrast, T cell lines established with the aid of IL 4 as growth factor (LNC.4) produced mainly lymphokines representative of TH2 cells. Apart from their pattern of lymphokine secretion LNC.2 and LNC.4 T cells were found to differ in their proliferative response to lymphokines and Con A. LNC.2 T cells proliferated only …
Characterization of lymphokine-mediated activation of macrophages for antigen presentation: studies with long-term cultured bone marrow-derived macrophages and cloned T cells.
In cultures of bone marrow (BM) supplemented with L cell-derived colony-stimulating factor a pure population of macrophages (M phi) differentiates, which can be further propagated with a doubling time of 3.8 days. "Young" BMM phi obtained on day 8 of culture were shown to act as antigen-presenting cells inducing the antigen-specific proliferation of the cloned T cell line ST2/K.9, whereas "old" M phi had lost this ability. However, at any time tested (up to 132 days) the presentation function of old BMM phi could be completely restored by pulsing the cells with lymphokines (LK). A duration of 11 hr for the LK-pulse was sufficient to trigger the M phi to exert an optimal presentation functio…