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J. Exp. Med.,
Volume 189, Number 10, May 17, 1999 1631-1638
7 Integrins in CD8 T Cell Trafficking
During an Antiviral Immune Response
By

From the * Division of Rheumatic Diseases, University of Connecticut Health Center, Farmington,
Connecticut 06037; the The requirement of
Lymphocyte Biology Section, Brigham and Women's Hospital, Harvard
Medical School, Boston, Massachusetts 02115; and the § Institute for Genetics, University of Cologne,
50937 Cologne, Germany
7 integrins for lymphocyte migration was examined during an ongoing
immune response in vivo. Transgenic mice (OT-I) expressing an ovalbumin-specific major
histocompatibility complex class I-restricted T cell receptor for antigen were rendered deficient in expression of all
7 integrins or only the
E
7 integrin. To quantitate the relative use
of
7 integrins in migration in vivo, equal numbers of OT-I and OT-I-
7
/
or OT-I-
E
/
lymph node (LN) cells were adoptively transferred to normal mice. Although OT-I-
7
/
LN
cells migrated to mesenteric LN and peripheral LN as well as wild-type cells,
7 integrins were
required for naive CD8 T cell and B cell migration to Peyer's patch. After infection with a recombinant virus (vesicular stomatitis virus) encoding ovalbumin,
7 integrins became critical
for migration of activated CD8 T cells to the mesenteric LN and Peyer's patch. Naive CD8
T cells did not enter the lamina propria or the intestinal epithelium, and the majority of migration of activated CD8 T cells to the small and large intestinal mucosa, including the epithelium,
was
7 integrin-mediated. The
E
7 integrin appeared to play no role in migration during a
primary CD8 T cell immune response in vivo. Furthermore, despite dramatic upregulation of
E
7 by CD8 T cells after entry into the epithelium, long-term retention of intestinal intraepithelial lymphocytes was also
E
7 independent.
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