Low zone tolerance requires ICAM-1 expression to limit contact hypersensitivity elicitation.
Painting subsensitizing doses of contact sensitizers on skin (low-dose tolerization) induces antigen (Ag)-specific tolerance, known as low zone tolerance (LZT), which has been experimentally demonstrated by the inhibition of contact hypersensitivity (CHS). Although LZT resulted from the inhibition of the sensitization phase, the effects on the effector/elicitation phase remain unknown. L-selectin and ICAM-1 regulate leukocyte influx into inflamed tissues during the elicitation phase of CHS. LZT was investigated in mice lacking either L-selectin or ICAM-1 to evaluate the roles these leukocyte receptors play in LZT during the elicitation phase. Low-dose tolerization effectively suppressed CHS in wild-type and L-selectin-deficient mice, but not in ICAM-1-deficient mice. Low-dose-tolerized ICAM-1-deficient splenocytes effectively suppressed the elicitation phase in naive wild-type recipients. Sensitized ICAM-1-deficient splenocytes showed normal proliferative responses to the sensitizing Ag and generated normal CHS in wild-type recipients. Thus, ICAM-1 deficiency did not affect sensitization. LZT was associated with a lack of ICAM-1 upregulation after elicitation, suggesting a potentially mechanistic role for ICAM-1. The blockade of IL-10, a possible mediator of LZT, produced by hapten-specific suppressor cells, abrogated LZT and restored ICAM-1 upregulation. These results indicate that low-dose tolerization controls CHS by abrogating ICAM-1 upregulation during the elicitation phase.
Komura
Kazuhiro
K
Department of Dermatology, Nagasaki University Graduate School of Biomedical Sciences, Sakamoto, Nagasaki, Japan.
Iwata
Yohei
Y
Ogawa
Fumihide
F
Yoshizaki
Ayumi
A
Yamaoka
Toshifumi
T
Akiyama
Yuichiro
Y
Hara
Toshihide
T
Hasegawa
Minoru
M
Fujimoto
Manabu
M
Sato
Shinichi
S
D019264:Adoptive Transfer; D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D003877:Dermatitis, Contact / Q000276:immunology*; D007108:Immune Tolerance / Q000276:immunology*; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics* / Q000276:immunology*; D016753:Interleukin-10 / Q000276:immunology; D019041:L-Selectin / Q000235:genetics / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D013154:Spleen / Q000166:cytology / Q000276:immunology; D015854:Up-Regulation / Q000276:immunology
D000911:Antibodies, Monoclonal; D018799:Intercellular Adhesion Molecule-1; D019041:L-Selectin; D016753:Interleukin-10