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*
Thomas E. Starzl Transplantation Institute and Departments of Surgery and
Molecular Genetics and Biochemistry, University of Pittsburgh, Pittsburgh, PA 15213; and
Department of Molecular Preventive Medicine, School of Medicine, and
Department of Surgery and Bioengineering, Institute of Medical Science, University of Tokyo, Tokyo, Japan
The immunosuppressive and anti-inflammatory cytokine IL-10
inhibits the phenotypic and functional maturation of dendritic cells
(DC) and has been reported to confer tolerogenic properties on these
important professional APC. Here, we exposed murine bone marrow-derived
myeloid DC to either mouse (m) or viral (v) IL-10 early during their in
vitro generation in response to GM-CSF and IL-4. Both mIL-10 and vIL-10
down-regulated the expression of CCR7 mRNA determined by RT-PCR, while
mIL-10 up-regulated the expression of CCR5 transcripts. These changes
in CCR7 and CCR5 expression were associated with inhibition and
augmentation, respectively, of DC chemotaxis toward their respective
agonists, macrophage inflammatory proteins 3
and 1
, while in vivo
homing of DC from peripheral s.c. sites to secondary lymphoid tissue of
syngeneic or allogeneic recipients was significantly impaired.
Anti-mIL-10R mAb reversed the effects of mIL-10 on CCR expression and
restored DC homing ability. Retroviral transduction of mIL-10- and
vIL-10-treated DC to overexpress transgenic CCR7 partially restored the
cells lymphoid tissue homing ability in allogeneic recipients.
However, CCR7 gene transfer did not reinstate the capacity of
IL-10-treated DC to prime host naive T cells for ex vivo proliferative
responses or Th1 cytokine (IFN-
) production in response to
rechallenge with (donor) alloantigen. These findings suggest that in
addition to their capacity to subvert DC maturation/function and confer
tolerogenic potential on these cells, mIL-10 and vIL-10 regulate DC
migratory responses via modulation of CCR
expression.
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