EFFECTS ON ANTITUMOR-ACTIVITY AND CYTOKINE PRODUCTION IN THE THORACICCAVITY BY INTRAPLEURAL ADMINISTRATION OF LACTOBACILLUS-CASEI IN TUMOR-BEARING MICE
T. Matsuzaki et al., EFFECTS ON ANTITUMOR-ACTIVITY AND CYTOKINE PRODUCTION IN THE THORACICCAVITY BY INTRAPLEURAL ADMINISTRATION OF LACTOBACILLUS-CASEI IN TUMOR-BEARING MICE, Medical microbiology and immunology, 185(3), 1996, pp. 157-161
The effects Lactobacillus casei Y1T9108 (LC 9018) on antitumor activit
y and cytokine production in Meth A fibrosarcoma (Meth Al-bearing BALB
/c mice were examined. Intrapleural (i.pl.) administration of LC 9018
was effective in prolonging the survival of Meth A-bearing mice, and f
requently cured mice of the tumor. However, the results also indicated
that the effect of LC 9018 was in part inhibited in mice treated with
anti-CD3 or anti-CD8 antibody, but not affected in anti-CD4 antibody-
treated mice. In contrast, LC 9018 had little effect on Meth A-bearing
SCID or nude mice. These results demonstrated that CD8(+) T cells par
ticipated in prolonging the survival of Meth A-bearing mice. Moreover,
the examination of the production of several cytokines revealed that
the production of interferon-gamma and interleukin-6 was, in particula
r, augmented in the exudated fluid of the thoracic cavity in BALB/c mi
ce injected with LC 9018 i.pl. These results suggested that i.pl. admi
nistration of LC 9018 induced those cytokines which had the potential
to activate the thoracic macrophages or proliferate the thoracic lymph
ocytes to the cytotoxic T cells. Taken together, these findings demons
trated that the prolonging effects on survival by i.pl. administration
of LC 9018 depended on CD8+ T cells, and the i.pl. administration of
LC 9018 into i.pl. Meth A-bearing mice induced several cytokines which
participated in the subsequent immunoresponses.