The distinct impact of maternal antibodies on the immunogenicity of live and recombinant rotavirus vaccines
2019
Abstract A high titre of
maternal antibodiesis one of the possible factors associated with decreased
rotavirus vaccineefficacy in low-income countries where rotavirus-associated morbidity and mortality are high. Although some studies show a negative correlation between
maternal antibodylevels and
seroconversionafter vaccination, withholding breastfeeding does not improve
rotavirus vaccineefficacy. Different types of
recombined vaccineswere developed as an alternative to produce higher protection in developing areas. In previous studies, we found that recombinantly expressed, truncated VP4* can stimulate high titres of
neutralizing antibodiesand can confer protection against rotavirus infections and rotavirus-induced diarrhoea. In this study, the impact of
maternal antibodieson live and recombinant
rotavirus vaccines(VP4*) was evaluated in a mouse model. Dams were infected orally with murine rotavirus 7 days after delivery to mimic a natural rotavirus infection in infants and to evaluate the separate effects of trans-placentally acquired and milk-acquired
maternal antibodies, pups were half exchanged. After immunization with live rotavirus, both the
neutralizing antibodyand IgA
antibodyresponses were inhibited by
maternal antibodies, especially by milk
antibodies; however, the
neutralizing antibodyresponses after immunization with recombinant VP4* were enhanced. In addition, the in vitro incubation of VP4* with immune sera of rotavirus could also enhance the immune responses could also enhance the immune responses. Our finding provides a basis for the development of non-replicating vaccines to address the problem of live
attenuated vaccinesin low- and middle-income countries.
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