Inactivated Rabies Virus-Vectored Immunocontraceptive Vaccine in a Thermo-Responsive Hydrogel Induces High and Persistent Antibodies against Rabies, but Insufficient Antibodies against Gonadotropin-Releasing Hormone for Contraception
2019
Rabiesis preventable through vaccination, but the need to mount annual canine vaccination campaigns presents major challenges in
rabiescontrol and prevention. The development of a
rabies vaccinethat ensures lifelong immunity and animal population management in one dose could be extremely advantageous. A nonsurgical alternative to spay/
neuteris a high priority for
animal welfare, but irreversible infertility in one dose has not been achieved. Towards this goal, we developed a
rabies virus-vectored
immunocontraceptivevaccine ERA-2GnRH, which protected against
rabies viruschallenge and induced >80% infertility in mice after three doses in a live, liquid-vaccine formulation (Wu et al., 2014). To improve safety and use, we formulated an
inactivated vaccinein a thermo-responsive chitosan hydrogel for one-dose delivery and studied the immune responses in mice. The hydrogel did not cause any
injection site reactions, and the killed ERA-2GnRH vaccine induced high and persistent
rabies virusneutralizing antibodies (rVNA) in mice. The rVNA in the hydrogel group reached an average of 327.40 IU/mL, more than 200 times higher than the liquid vaccine alone. The
Gonadotropin-releasing hormone(GnRH) antibodies were also present and lasted longer in the hydrogel group, but did not prevent fertility in mice, reflecting a possible threshold level of GnRH antibodies for contraception. In conclusion, the hydrogel facilitated a high and long-lasting immunity, and ERA-2GnRH is a promising dual vaccine candidate. Future studies will focus on
rabiesprotection in target species and improving the anti-GnRH response.
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