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Immune response at birth, long-term immune memory and 2 years follow-up after in-utero anti-HBV DNA immunization

Abstract

Infections occurring at the end of pregnancy, during birth or by breastfeeding are responsible for the high toll of death among first-week infants. In-utero DNA immunization has demonstrated the effectiveness in inducing specific immunity in newborns. A major contribution to infant immunization would be achieved if a vaccine proved able to be protective as early as at the birth, preventing the typical ‘first-week infections’. To establish its potential for use in humans, in-utero DNA vaccination efficiency has to be evaluated for short- and long-term safety, protection at delivery, efficacy of boosts in adults and effective window/s for modulation of immune response during pregnancy, in an animal model suitable with human development. Here we show that a single intramuscular in-utero anti-HBV DNA immunization at two-thirds of pig gestation produces, at birth, antibody titers considered protective in humans. The boost of antibody titers in every animal following recall at 4 and 10 months demonstrates the establishment of immune memory. The safety of in-utero fetus manipulation is guaranteed by short-term (no fetus loss, lack of local alterations, at-term spontaneous delivery, breastfeeding) and long-term (2 years) monitoring. Treatment of fetuses closer to delivery results in immune ignorance without induction of tolerance. This result highlights the repercussion of selecting the appropriate time point when this approach is used to deliver therapeutic genes. All these findings illustrate the relevance of naked DNA-based vaccination technology in therapeutic efforts aimed to prevent the high toll of death among first-week infants.

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Acknowledgements

This study was supported in part by grants from the Italian Ministry of Health (IRCCS-CSS, RC99). We are particularly grateful to all the technical staff of the ‘Stabilimento di Allevamento e di Utilizzazione Animali’ of the Catholic University of Rome for their skilful help and advise in every procedure with animals, their warm attention to the animal care and their tireless assistance. We thank Dr Francesca Berlinguer for English mothertongue proof-reading and Miss Simona Virga for secretarial assistance and artwork. This work is dedicated to Professors Domenico Fazio and Franca Mastroviti-Fazio for their lifelong and loving contribution to Culture and Education, and to Professor ‘Nino’ Gaetano Salvatore for his high and timeless contribution to the scientific knowledge and University formation.

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Fazio, V., Ria, F., Franco, E. et al. Immune response at birth, long-term immune memory and 2 years follow-up after in-utero anti-HBV DNA immunization. Gene Ther 11, 544–551 (2004). https://doi.org/10.1038/sj.gt.3302179

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