[Behaviour of gamma delta TCR+ T cells during the course of nontuberculous mycobacterial infections and proliferative response of host lymphocytes to 65kD heat shock protein].
In order to know the possibility that gamma delta TCR+ T cells induced by Mycobacterium avium complex (MAC) infections participate in the expression of host resistance and in the occurrence of Behçet disease, we examined the behaviour of them in MAC-infected host mice. In both BALB/c (Bcgs; MAC-susceptible) and CBA/JN (Bcgr; MAC-resistant) strain mice, a transient but appreciable increase in the number of gamma delta TCR+ T cells in the host peritoneal lymphocytes was noted around week 1 to 2 after M. intracellulare infection via ip. route. The degree of induction of gamma delta TCR+ T cells was somewhat higher in CBA/JN mice than in BALB/c mice. Therefore, gamma delta TCR+ T cells are partly responsible for the expression of host resistance against the MAC in the early phase of infection. However, the subsequent decrease in the level of gamma delta TCR+ T cells was observed by week 5. Thus, in the case of chronic state of MAC infection, the size of gamma delta TCR+ T cell-pool seems to be in normal level. This suggests that per cell activity of gamma delta TCR+ T cells rather than mobilizing number of them is important factor in the mechanisms for occurrence of allergic diseases including Behçet disease. Although, the early increase in gamma delta TCR+ T cells of peritoneal cells was also observed during the course of M. fortuitum infection, the degree of induction of gamma delta TCR+ T cells in A/J mice (M. fortuitum-susceptible) was in similar level as that in BALB/c mice (M. fortuitum-resistant).(ABSTRACT TRUNCATED AT 250 WORDS)
Tomioka
H
H
Department of Microbiology and Immunology, Shimane Medical University, Japan.
Saito
H
H
Emori
M
M
Setogawa
T
T
D000818:Animals; D001426:Bacterial Proteins; D001528:Behcet Syndrome / Q000276:immunology; D018834:Chaperonin 60; D018833:Chaperonins; D005260:Female; D006360:Heat-Shock Proteins / Q000276:immunology*; D007113:Immunity, Innate; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D009162:Mycobacterium avium; D016692:Receptors, Antigen, T-Cell, gamma-delta; D013601:T-Lymphocytes / Q000276:immunology*; D014376:Tuberculosis / Q000276:immunology / Q000662:veterinary*
D001426:Bacterial Proteins; D018834:Chaperonin 60; D006360:Heat-Shock Proteins; D016692:Receptors, Antigen, T-Cell, gamma-delta; C074119:heat-shock protein 65, Mycobacterium; D018833:Chaperonins