T cell-dependent induction of antibody against foot-and-mouth disease virus in a mouse model.
Nude and normal BALB/c mice were primed by intravenous inoculation of purified, infectious foot-and-mouth disease virus (FMDV) type A24, strain Cruzeiro. Frequency estimation of antigen-specific antibody-secreting cells (ASC) and Thy 1+ T cells in the spleens of immunized mice identified that the IgM response was similar for both nude and normal mice, whereas substantial numbers of both IgG ASC and Thy 1+ cells were present in normal mice only. In contrast, nude and normal mouse sera both contained IgG although the nude mouse serum was deficient in IgG1. Antigen-specific antibody could not be induced in spleen cell cultures from C57BL/6 mice after depletion of T cells with monoclonal antibody plus complement. However, the antibody response could be reconstituted if either a source of exogenous lymphokines or T cells from primed but not unprimed mice were added. Similarly, polyclonal stimulation or unprimed T cells could restore the in vitro response and thus complemented the finding of a low frequency of helper T cells in unprimed mice. Taken together, these data identify that the induction of IgG in FMDV-immunized mice is T cell-dependent and regulated by lymphokines. Furthermore, in nude mice a site other than the spleen must be responsible for the synthesis of the observed serum IgG.
Collen
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T
AFRC Institute for Animal Health, Pirbright Laboratory, Vaccine Research Department, Woking, Surrey, U.K.
Pullen
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L
Doel
T R
TR
D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis / Q000096:biosynthesis*; D000918:Antibody Specificity; D000921:Antibody-Producing Cells / Q000276:immunology*; D005537:Aphthovirus / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D004195:Disease Models, Animal; D005536:Foot-and-Mouth Disease / Q000276:immunology; D007114:Immunization; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D013601:T-Lymphocytes / Q000276:immunology*
D000914:Antibodies, Viral