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Oral tolerance correlates with high levels of lymphocyte activity

2012; Elsevier BV; Volume: 280; Issue: 2 Linguagem: Inglês

10.1016/j.cellimm.2012.12.004

1090-2163

Antônio Barros de Castro, Bernardo Coelho Horta, Ana Cristina Gomes-Santos, Andre Pires da Cunha, R.S. Steinberg, Danielle S. Nascimento, Ana Maria Caetano Faria, Nelson M. Vaz,

T-cell and B-cell Immunology

Oral tolerance is defined as an inhibition of specific immune responsiveness to a previously ingested antigen. Paradoxically, we found an increased lymphocyte activity in tolerant mice alongside the specific inhibition. Orally-tolerant mice presented higher number of immunoglobulin secreting cells (ISC) in spleen and bone marrow; showed a greater variety of Ig classes being produced: IgM and IgA in the spleen and IgG and IgM in the bone marrow. ISC from immunized mice produced mainly IgG. Despite having the same number of regulatory and activated T cells in the spleen after immunization, these cells appeared earlier in tolerant mice, right after the primary immunization. Also, tolerant mice showed a prompt expression of regulatory cytokines (TGF-β and IL-10) and a transient expression of effector cytokines (IL-2 and IFN-γ). Thus, in addition to an inhibited specific responsiveness, orally-tolerant mice displayed an early and widespread mobilization of activated and regulatory lymphocytes.