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Proliferative T-cell responses to poliovirus in various strains of mice have been analyzed by using either killed purified virus or capsid protein VP1 synthetic peptides. Following immunization of mice with inactivated poliovirus type 1 (PV1), a specific proliferative response of their lymph node CD4+ T cells was obtained after in vitro stimulation with purified virus. In mice immunized with PV1, PV2, or PV3, a strong cross-reactivity of the T-cell responses was observed after in vitro stimulation with heterologous viruses. By using various strategies, a dominant T-cell epitope was identified in the amino acid 103 to 115 region of capsid polypeptide VP1, close by the C3 neutralization epitope. The T-cell response to VP1 amino acids 103 to 115 is H-2 restricted: H-2d mice are responders, whereas H-2k and H-2b mice do not respond to this T-cell epitope. Immunization of BALB/c (H-2d) mice with the uncoupled p86-115 peptide, which represents VP1 amino acids 86 to 115 and contains both the T-cell epitope and the C3 neutralization epitope, induced poliovirus-specific B- and T-cell responses. Moreover, these mice developed poliovirus neutralizing antibodies.

Identification of a T-cell epitope adjacent to neutralization antigenic site 1 of poliovirus type 1