Effect of T-cell deficiency on the formation of periapical lesions in mice: histological comparison between periapical lesion formation in BALB/c and BALB/c nu/nu mice.
The role of T-cells in the development of periapical lesions was investigated immunohistochemically using 16 normal (BALB/c) mice and 16 nude (BALB/c nu/nu) mice (congenitally T-cell-deficient mice). The pulp chambers of maxillar first molars of all mice were opened, and the infiltrated immunocytes (anti-Thy1.2, -Lyt-1, -Lyt-2, -L3T4, -I-Ad, -IgG, and -IgM positive cells) were determined immunohistochemically at 2, 4, 6, and 8 wk after operation. Periapical lesions appeared at 2 wk in both mouse groups. Numerous anti-I-Ad positive-stained cells appeared at 2 wk, anti-I-Ad, -Thy1.2 (-Lyt-1, -L3T4), -IgG positive-stained cells appeared between 4 and 8 wk, and periapical lesions with bone resorption rapidly increased until 4 wk in normal mice. On the other hand in nude mice, only anti-I-Ad and -IgG positive cells were present from 4 to 6 wk, and the progress of periapical lesions with inflammatory cells stopped at 6 wk. Furthermore, numerous fibroblasts were found instead of inflammatory cells at 8 wk. These findings suggest that the progression of periapical lesions with bone resorption required helper T-cells and numerous immunoglobulin-producing cells.
Tani
N
N
Department of Endodontics, Kanagawa Dental College, Japan.
Kuchiba
K
K
Osada
T
T
Watanabe
Y
Y
Umemoto
T
T
D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D001402:B-Lymphocytes; D005260:Female; D007150:Immunohistochemistry; D008231:Lymphopenia / Q000150:complications; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010485:Periapical Periodontitis / Q000209:etiology / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D018800:Thy-1 Antigens
D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D018800:Thy-1 Antigens