The Regulation of the Immune Response of Mice to Haemophilus Influenzae Type B Capsular Polysaccharide
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The regulation of age-related antibody response to Haemophilus influenzae type b polysaccharide (HITB-PS) was studied by measuring the splenic plaque forming cells (PFC) following immunization with this capsular polysaccharide. The magnitude of PFC response to HITB-PS was found to be dose-related, enhanced by Freund's complete adjuvant and influenced by the genetic strain of mice. Priming with a low dose of HITB-PS did not induce a state of immunological unresponsiveness. Treatment with antilymphocyte serum significantly increased the PFC response to HITB-PS. Athymic nude mice showed an enhanced ability to induce both IgG and IgA-PFC responses as well as a significant increase in the biosynthesis of protein and mitogenicity in spleen cells. These findings suggest that the immune response to HITB-PS is regulated by the suppressor T cell. The magnitude of the IgM-PFC response induced by HITB-PS in mice increased gradually from two weeks of age and reached a plateau at 8 weeks. Treatment with fetuin resulted in the inhibition of direct IgM and IgG-PFC responses to HITB-PS; the suppressive effect on the immune response was more profound and lasting in young than in adult mice.
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