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1996-02-26
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Document 0522
DOCN M9620522
TI T cell-dependent loss of proliferative responsiveness to
colony-stimulating factor-1 by a murine epidermal-derived dendritic cell
line, XS52.
DT 9602
AU Kitajima T; Ariizumi K; Bergstresser PR; Takashima A; Department of
Dermatology, University of Texas Southwestern; Medical Center, Dallas
75235, USA.
SO J Immunol. 1995 Dec 1;155(11):5190-7. Unique Identifier : AIDSLINE
MED/96072792
AB We have reported previously that XS52 cells, a long-term dendritic cell
(DC) line established from mouse epidermis, proliferate maximally in
response to CSF-1, and that XS52 cells expanded in this manner induce
brisk proliferation of HDK-1 T cells (KLH-specific Th1 clone) and 5S8 T
cells (DNBS-specific Th0 clone) in the presence of Ag. Our purpose was
to determine whether CSF-1-dependent mitotic potential of XS52 cells
might be affected upon Ag-dependent interaction with these T cell
clones. Both surface CSF-1R expression and mitotic responsiveness to
CSF-1 became undetectable within 24 h after incubation with each T cell
clone in the presence of relevant Ag. By contrast, incubation with T
cells alone or Ag alone had minimal effect, indicating a requirement for
both T cells and Ag. Exposure of fresh XS52 cells to the supernatant
collected from complete XS52/HDK-1/KLH or XS52/5S8/DNBS coculture was
sufficient to abrogate both CSF-1R expression and CSF-1 responsiveness.
Importantly, both were restored by mAb against IFN-gamma, and both were
diminished by rIFN-gamma in the absence of T cells or Ag. Thus,
IFN-gamma, which was detected in relatively large amounts in the above
supernatants, serves as a major mediator. rIFN-gamma reduced the number
of CSF-1 binding sites on XS52 cell surface, without affecting CSF-1R
mRNA expression. Thus, it appears that IFN-gamma down-regulates CSF-1R
by a post-transcriptional mechanism. We interpret these results to
document a novel, bi-directional signaling event in which Ag-dependent
DC-T cell interaction promotes the growth of T cells, but inhibits the
growth of DC.
DE Animal Antigens/PHARMACOLOGY Cell Division Cell Line Dendritic
Cells/*IMMUNOLOGY Down-Regulation (Physiology) Hemocyanin/PHARMACOLOGY
Interferon Type II/PHARMACOLOGY Macrophage Colony-Stimulating
Factor/*IMMUNOLOGY Mice Mice, Inbred BALB C Receptors,
Colony-Stimulating Factor/BIOSYNTHESIS RNA, Messenger/ANALYSIS Signal
Transduction Skin/CYTOLOGY Support, Non-U.S. Gov't Support, U.S.
Gov't, P.H.S. Th1 Cells/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).