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TCRs in V
1-Deficient Mice1


Departments of
*
Immunology and
Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan; and
Department of Dermatology, Section of Immunobiology, Yale Skin Diseases Research Core Center, Yale University, New Haven, CT 06520
One of the most intriguing features of 
T cells that reside
in murine epithelia is the association of a specific V
/V
usage
with each epithelial tissue. Dendritic epidermal T cells (DETCs) in the
murine epidermis, are predominantly derived from the "first wave"
V
5+ fetal thymocytes and overwhelmingly express the
canonical V
5/V
1-TCRs lacking junctional diversity. Targeted
disruption of the V
1 gene resulted in a markedly impaired
development of V
5+ fetal thymocytes as precursors of
DETCs; however, 
TCR+ DETCs with a typical dendritic
morphology were observed in V
1-/- mice and their cell
densities in the epidermis were slightly lower than those in
V
1+/- epidermis. Moreover, the V
1-deficient DETCs
were functionally competent in their ability to up-regulate cytokines
and keratinocyte growth factor-expression in response to keratinocytes.
V
5+ DETCs were predominant in the V
1-/-
epidermis, though V
5- 
TCR+ DETCs were
also detected. The V
5+ DETCs showed a typical dendritic
shape, 
TCRhigh, and age-associated expansion in
epidermis as observed in conventional DETCs of normal mice, whereas the
V
5- 
TCR+ DETCs showed a less
dendritic shape, 
TCRlow, and no expansion in the
epidermis, consistent with their immaturity. These results suggest that
optimal DETC development does not require a particular V
/V
-chain
usage but requires expression of a limited diversity of 
TCRs,
which allow DETC precursors to mature and expand within the epidermal
microenvironment.
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