A study was carried out to determine the effect of N-5', a new anti-allergic drug, on antibody formation, and the following results were obtained. 1) Rats were immunized with dinirophenylated ascaris extract (DNP-As) plus killed Bordetella pertussis, and boosted with DNP-As alone after 5 days. Eight days after the first immunization, IgE and hemagglutinin titers were assayed by the 48 hr homologous PCA and passive hemagglutination test, respectively. Neither IgE or hemagglutinin titers were affected by N-5', in doses of 2, 5, 10 and 20 mg/kg/day given p.o. for 5 days after the first immunization. 2) Formation of hemolytic plaque foming cells in the spleens of mice immunized with sheep red blood cells (SRBC) was not significantly affected by N-5' in doses of 5, 10 and 20 mg/kg/day given i.p.for 5 days following SRBC-immunization. After 5 days, spleen weight and number of spleen cells increased in animals treated with 10 and 20mg/kg/day of N-5'. A slight increase was also found in hemolysin and hemagglutinin titers of animals given 5 and 20 mg/kg/day of the agent on day 7 following the immunization. These results suggest that N-5' would be harmless on antibody forming tissue. The anti-allergic action is apparently not due to suppression of pathogenic antibody, i.e. IgE, formation.
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