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BACKGROUND: Cooperation of CD4+ T helper cells with specific B cells is crucial for protective vaccination against pathogens by inducing long-lived neutralizing antibody responses. During infection with persistence-prone viruses, prolonged virus replication correlates with low neutralizing antibody responses. We recently described that a viral mutant of lymphocytic choriomeningitis virus (LCMV), which lacks a T helper epitope, counterintuitively induced an enhanced protective antibody response. Likewise, partial depletion of the CD4+ T cell compartment by using anti-CD4 antibodies enhanced protective antibodies. PRINCIPAL FINDINGS: Here we have developed a protocol to selectively reduce the CD4+ T cell response against viral CD4+ T cell epitopes. We demonstrate that in vivo treatment with LCMV-derived MHC-II peptides induced non-responsiveness of specific CD4+ T cells without affecting CD4+ T cell reactivity towards other antigens. This was associated with accelerated virus-specific neutralizing IgG-antibody responses. In contrast to a complete absence of CD4+ T cell help, tolerisation did not impair CD8+ T cell responses. CONCLUSIONS: This result reveals a novel "negative vaccination" strategy where specific CD4+ T cell unresponsiveness may be used to enhance the delayed protective antibody responses in chronic virus infections.

Original publication

DOI

10.1371/journal.pone.0001162

Type

Journal article

Journal

PLoS One

Publication Date

14/11/2007

Volume

2

Keywords

Amino Acid Sequence, Animals, Antibodies, Viral, CD4-Positive T-Lymphocytes, Cell Separation, Enzyme-Linked Immunosorbent Assay, Flow Cytometry, Immune Tolerance, Mice, Mice, Inbred C57BL, Molecular Sequence Data, Neutralization Tests