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1996-02-27
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Document 0026
DOCN M9630026
TI Dendritic cells as stimulator cells of MHC class I-restricted immune
responses.
DT 9603
AU Elbe A; Stingl G; Department of Dermatology, Univ. of Vienna Medical
School, VIRCC,; Austria.
SO Adv Exp Med Biol. 1995;378:341-5. Unique Identifier : AIDSLINE
MED/96036873
AB We have shown that growth factor-dependent, MHC class I+/II dendritic
cell lines established from mouse fetal skin, can stimulate naive,
allogeneic but not syngeneic CD8+ T cells in the absence of CD4+ T cells
and that this T cell response is restricted by MHC class I molecules. We
further showed that the FSCL-induced activation of naive CD8+ T cells is
critically dependent on the physical contact between stimulator and
responder cells and the expression of the costimulatory molecule B7 on
FSCL. An important question that remains to be addressed concerns the
derivation of FSCL. One could argue that they are members of the LC/DC
family because they (i) exhibit certain features of fetal murine LC
(i.e., CD45+, CD44+, CD32+, MHC class I+, MHC class II-, asialo GM1+,
TCR-) including membrane-bound ADPase activity (A. Elbe, unpublished
observation) and (ii) exhibit a pronounced dendritic configuration when
cultured. If these cells are indeed derived from fetal LC, they should
undergo the same phenotypic changes (MHC class II(-)-->MHC class II+)
under in vitro culture conditions as do fetal LC in situ. However, our
FSCL are phenotypically stable, and attempts to induce MHC class II
expression with cytokine cocktails were unsuccessful. One explanation
for this phenomenon could be that stimulatory signals provided by fetal
keratinocytes or other skin cells are responsible for LC maturation in
vivo and that, due to the early demise of these stromal cells in fetal
skin cell cultures, the maturation process would not have been
completed.(ABSTRACT TRUNCATED AT 250 WORDS)
DE Animal Cell Communication Cell Line Cytokines/METABOLISM
CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Dendritic Cells/*IMMUNOLOGY Fetus
Histocompatibility Antigens Class I/*METABOLISM Lymphocyte
Transformation Mice Skin/CYTOLOGY/IMMUNOLOGY T-Lymphocytes,
Cytotoxic/*IMMUNOLOGY JOURNAL ARTICLE REVIEW REVIEW, TUTORIAL
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).