Publications [#281840] of Thomas B. Kepler
Papers Published
- Han, S; Hathcock, K; Zheng, B; Kepler, TB; Hodes, R; Kelsoe, G, Cellular interaction in germinal centers. Roles of CD40 ligand and B7-2 in established germinal centers.,
Journal of immunology (Baltimore, Md. : 1950), vol. 155 no. 2
(July, 1995),
pp. 556-567, ISSN 0022-1767 [7541819]
(last updated on 2018/07/04)Abstract:
Costimulatory interactions between T and B lymphocytes are crucial for T cell activation and B cell proliferation and differentiation. We have compared the roles of CD40L and B7-2 in the initiation and maturation of humoral immunity by administering anti-CD40 ligand (L) or anti-B7-2 Ab during the early (days -1 to 3) or late (days 6-10) phases of primary responses to thymus-dependent (Td) and -independent (Ti) Ags. Germinal center (GC) formation in response to a Td Ag was inhibited completely by the early administration of anti-CD40L or anti-B7-2 Abs. Later in the response, established GCs remained sensitive to anti-CD40L but were resistant to treatment with anti-B7-2. However, Ig hypermutation was reduced dramatically in GCs of anti-B7-2-treated mice and humoral memory was impaired. Early administration of anti-CD40L reduced serum Ab levels to approximately 10% of controls, whereas early treatment with anti-B7-2 reduced Ab production by only 50%. Later treatments with either Ab had no effect on Ab production. Response to a type II Ti Ag was more resistant than Td responses to interruption of costimulatory interactions. Our findings suggest that the costimulatory roles of CD40:CD40L and B7-2:CD28/CTLA-4 differ in the GC; administration of anti-CD40L abrogates an established GC reaction, whereas Ab to B7-2 suppresses Ig hypermutation and entry into the B cell memory compartment. Once B cells have entered the differentiation pathway to Ab production, neither CD40L nor B7-2 is necessary for their continued differentiation and persistence.Keywords:
Animals • Antibodies, Monoclonal • Antibody Formation • Antigens, CD* • Antigens, CD80 • Antigens, CD86 • B-Lymphocytes • Bacterial Vaccines • Base Sequence • CD40 Ligand • Cell Differentiation • Female • Immunologic Memory • Ligands • Lymph Nodes • Lymphocyte Activation • Membrane Glycoproteins • Mice • Mice, Inbred C57BL • Molecular Sequence Data • Mutation • Streptococcus pneumoniae • cytology • drug effects • drug effects* • immunology • pharmacology*