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[Influence of phase shift in light-dark cycle on immune response of mice (author's transl)].

Mice immunized with the red cells of sheep (6.6×107/g body weight) were sacrified to collect sera and spleen samples in order to investigate the influence of light inversion on primary as well as secondary immune responses, and changes in the course of time of the immune response was studied. Tests for hemagglutination (HA) and hemolytic reaction (HR) were carried out to find the antibody titers in the sera, and the numbers of plaque-forming cells (PFC) in the spleen were counted. The following results were obtained: 1) The loss of immune response was significant in mice immunized on the 4th day after inversion of the light-dark cycles with the dark period prolonged, as compared with the control group under an unchanged light-dark regimen. 2) On prolonging the light period, similar phenomena were observed. 3) The time for the immune response on the 4th day after the inversion of light-dark cycles indicated that antibody production was suppressed only in the initial phase of the immune response.