Antibody response of BALB/c mice to dextran B1355S: alterations in the expression of an idiotype associated with the depletion of idiotype-binding cells.
In this study, we established that BALB/c mice recognize and respond to the idiotype (M104E IdI) of a major dextran-specific clonotype within the BALB/c mouse repertoire. This idiotype recognition is established by demonstrating the presence of idiotype-binding cells and by the production of antibodies specific for the private M104E idiotype. To determine whether or not the idiotype-recognizing cells play a regulatory role during an immune response to dextran, the idiotype-binding cells were selectively removed either by panning or by radiation-induced killing. Two significant effects are observed when the depleted spleen cells are immunized with dextran. First, there is a substantial increase in the proportion of anti-dextran antibodies that are M104E IdI+. The second effect of the idiotype-specific cell depletion is the production of significant amounts of M104E IdI+ immunoglobulin molecules which do not bind dextran. The depletion experiments produced no alteration in the concentration of anti-dextran antibodies found in the serum or in the number of dextran-specific PFC in the spleen. The data indicate that idiotype-reactive cells can play a role in regulating the level of individual clonotype expression (i.e., the M104E clonotype), but that an alternative mechanism must exist for regulating the absolute amount of anti-dextran antibody produced after immunization.
B S
BS
Schepart
M
M
Abu-Hadid
G L
GL
Mayers
R B
RB
Bankert
D000818:Animals; D000918:Antibody Specificity; D000955:Antigens, T-Independent / Q000276:immunology*; D003911:Dextrans / Q000276:immunology*; D005260:Female; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D007136:Immunoglobulins / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology* / Q000528:radiation effects; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000166:cytology / Q000276:immunology
D000955:Antigens, T-Independent; D003911:Dextrans; D007130:Immunoglobulin Idiotypes; D007136:Immunoglobulins