title: Regulation of the growth and differentiation of Trypanosoma (Trypanozoon) brucei brucei in resistant (C57Bl/6) and susceptible (C3H/He) mice.
abstract: While Trypanosoma brucei brucei GUTat 3 were equally infective for C3H/He and for C57Bl/6 mice at doses ranging from 5 to 5 x 10(3) organisms and had similar prepatent periods in both strains of mice, infected C57Bl/6 mice displayed lower parasitaemia, shorter times to parasite wave remission and survived for a longer time than infected C3H/He mice. Parasite growth and differentiation rates and host immune responses were similar for the first 5 days in both strains of mice after infection with 10(3) T.b.brucei GUTat 3 but, thereafter, parasite differentiation proceeded more rapidly and specific antibodies reached higher titres in C57Bl/6 than in C3H/He mice. In contrast, parasite growth and differentiation rates were similar in irradiated mice of both strains. Furthermore, following inoculation of intact mice with irradiated T.b.brucei GUTat 3, C3H/He mice actually mounted higher titred antibody responses than C57Bl/6 mice showing that they were not intrinsically defective in their capacity to respond to GUTat 3 antigens. Parasite differentiation occurred at the same rate in irradiated (650r) C57Bl/6 mice and in irradiated C57Bl/6 mice reconstituted with syngeneic spleen cells although T.b.brucei GUTat 3 specific antibody was detected in the latter mice prior to peak parasitaemia. Furthermore, it was shown directly in C57Bl/6 mice that there was no selective destruction of slender form T.b.brucei GUTat 3 parasites during the phase of accumulation of stumpy form parasites. These studies indicate that the more rapid differentiation of T.b.brucei GUTat 3 parasites in infected C57Bl/6 mice as compared to infected C3H/He mice was unlikely to be directly related to the more efficient antibody response in the infected C57Bl/6 mice. The observations suggest that there might be an association between host mechanisms which regulate differentiation of T.b.brucei parasites and those which regulate antibody responses.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000502:physiology; D004198:Disease Susceptibility; D005260:Female; D007113:Immunity, Innate; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D014346:Trypanosoma brucei brucei / Q000166:cytology / Q000254:growth & development* / Q000276:immunology; D014353:Trypanosomiasis, African / Q000276:immunology* / Q000469:parasitology
chemical_list: D000906:Antibodies; D007074:Immunoglobulin G; D007075:Immunoglobulin M