home *** CD-ROM | disk | FTP | other *** search
- 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).
-
-