Abstract
Intranasal (i.n.) immunization of BALB/c mice with chimeric murine rotavirus EDIM (epizootic diarrhea of infant mice) VP6 and attenuated E. coli heat-labile toxin (LT), LT(R192G), stimulated >99% protection against rotavirus shedding after EDIM challenge. Here, we evaluated other potential adjuvants with chimeric VP6 administered by two mucosal routes: i.n. and oral. Besides LT(R192G), the adjuvants examined included Adjumer, CpG oligodeoxynucleotides (CpG ODN), chimeric A1 subunit of cholera toxin (CTA1)-DD, and QS-21. All except QS-21 significantly (P<0.05) increased VP6-specific serum IgG responses after i.n. immunization, but none significantly increased these responses when administered orally. The i.n. delivery of chimeric VP6 alone induced both rotavirus IgG1 and IgG2a whose relative titers suggested a skewed Th2-like response. Inclusion of Adjumer greatly increased Th2-like responses, while CpG ODN shifted the response to a less Th2-like response. The adjuvants CTA1-DD, LT(R192G), QS-21 had no significant effect on ratios of IgG1/IgG2a titers. Following EDIM challenge of mice immunized i.n. with chimeric VP6 and either LT(R192G), CTA1-DD, Adjumer or CpG ODN, shedding was reduced >99, 95, 80, 74, respectively, relative t...Continue Reading
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