title: The effect of immunization with a 14-kDa streptococcal antigen on primate T cell and B cell responses.
abstract: A streptococcal antigen (SA) of 185 kDa was isolated from Streptococcus mutans and this antigen induced in vitro helper, suppressor and contrasuppressor activities with primate peripheral blood lymphocytes. The 185-kDa SA was then treated by sodium dodecyl sulfate and yielded a 4-kDa SA which was capable of eliciting only helper activity. We have now cleaved the 185-kDa SA with cyanogen bromide, in an attempt to identify suppressor and contrasuppressor determinants. A 14-kDa SA was separated from the cyanogen bromide digest and its ability to elicit T cell and B cell functional activities was tested in rhesus monkeys. Whereas the 185-kDa SA (and 4-kDa SA) elicited high serum anti-SA antibodies and the CD4 cells showed an increase in DNA synthesis, this was not demonstrable with the 14-kDa SA. However, the 14-kDa SA, unlike the 185-kDa SA, activated a significant proportion of CD4 and CD8 cells to bind the Vicia villosa lectin (VV) and this is a characteristic feature of contrasuppressor cells. We then studied the effect of sequential immunization of monkeys with the 14-kDa SA, followed by the 185-kDa SA. The results of this showed suppression of the CD4 proliferative response, in the presence of a normal antibody production. We suggest that the split tolerance between the T cell proliferative and B cell differentiating functions might be interpreted on the basis of suppressor CD8 cells inhibiting the CD4 proliferative phase and the VV-adherent CD8 cells contrasuppressing B cell antibody formation.
authors.affiliation: Department of Immunology, United Medical School, Guy's Hospital, London, GB.
authors.forename: R
authors.initials: R
authors.lastname: Fellowes
authors.forename: F
authors.initials: F
authors.lastname: Fortune
authors.forename: L A
authors.initials: LA
authors.lastname: Bergmeier
authors.forename: T
authors.initials: T
authors.lastname: Lehner
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D000917:Antibody Formation; D000942:Antigens, Bacterial / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002454:Cell Differentiation; D007108:Immune Tolerance; D007114:Immunization; D037102:Lectins; D008213:Lymphocyte Activation; D008253:Macaca mulatta; D037121:Plant Lectins; D013295:Streptococcus mutans / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D037102:Lectins; D037121:Plant Lectins; C042242:Vicia lectins