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Tandem truncated rotavirus VP8* subunit protein with T cell epitope as non-replicating parenteral vaccine is highly immunogenic.

ABSTRACT: The two currently available live oral rotavirus vaccines, Rotarix(®) and RotaTeq(®), are highly efficacious in the developed countries. However, the efficacy of such vaccines in resource deprived countries in Africa and Southeast Asia is low. We reported previously that a bacterially-expressed rotavirus P2-P[8] ?VP8* subunit vaccine candidate administered intramuscularly elicited high-titers of neutralizing antibodies in guinea pigs and mice and significantly shortened the duration of diarrhea in neonatal gnotobiotic pigs upon oral challenge with virulent human rotavirus Wa strain. To further improve its vaccine potential and provide wider coverage against rotavirus strains of global and regional epidemiologic importance, we constructed 2 tandem recombinant VP8* proteins, P2-P[8] ?VP8*-P[8] ?VP8* and P2-P[8] ?VP8*-P[6] ?VP8* based on Escherichia coli expression system. The two resulting recombinant tandem proteins were highly soluble and P2-P[8] ?VP8*-P[8] ?VP8* was generated with high yield. Moreover, guinea pigs immunized intramuscularly by 3 doses of the P2-P[8] ?VP8*-P[8] ?VP8* or P2-P[8] ?VP8*-P[6] ?VP8* vaccine with aluminum phosphate adjuvant developed high titers of homotypic and heterotypic neutralizing antibodies against human rotaviruses bearing G1-G4, G8, G9 and G12 with P[8], P[4] or P[6] combination. The results suggest that these 2 subunit vaccines in monovalent or bivalent formulation can provide antigenic coverage to almost all the rotavirus G (VP7) types and major P (VP4) types of global as well as regional epidemiologic importance.

SUBMITTER: Wen X

PROVIDER: S-EPMC4635725 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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Tandem truncated rotavirus VP8* subunit protein with T cell epitope as non-replicating parenteral vaccine is highly immunogenic.

Wen Xiaobo X Cao Dianjun D Jones Ronald W RW Hoshino Yasutaka Y Yuan Lijuan L

Human vaccines & immunotherapeutics 20150101 10

The two currently available live oral rotavirus vaccines, Rotarix(®) and RotaTeq(®), are highly efficacious in the developed countries. However, the efficacy of such vaccines in resource deprived countries in Africa and Southeast Asia is low. We reported previously that a bacterially-expressed rotavirus P2-P[8] ΔVP8* subunit vaccine candidate administered intramuscularly elicited high-titers of neutralizing antibodies in guinea pigs and mice and significantly shortened the duration of diarrhea i ...[more]

PMID: 26091081

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Project description:Currently available live oral rotavirus vaccines, Rotarix(®) and RotaTeq(®), are highly efficacious in developed countries. However, the immunogenicity and efficacy of such vaccines in some developing countries are low. We reported previously that bacterially-expressed rotavirus ?VP8* subunit vaccine candidates with P[8], P[4] or P[6] specificity elicited high-titer virus neutralizing antibodies in animals immunized intramuscularly. Of note was the finding that antibodies induced with the P[8]?VP8* vaccine neutralized both homotypic P[8] and heterotypic P[4] rotavirus strains to high titer. To further improve its vaccine potential, a tetanus toxoid universal CD4(+) T cell epitope P2 was introduced into P[8] or P[6]?VP8* construct. The resulting recombinant fusion proteins expressed in Escherichia coli were of high solubility and were produced with high yield. Two doses (10 or 20 ?g/dose) of the P2-P[8]?VP8* vaccine or P2-P[6]?VP8* vaccine with aluminum phosphate adjuvant elicited significantly higher geometric mean homologous neutralizing antibody titers than the vaccines without P2 in intramuscularly immunized guinea pigs. Interestingly, high levels of neutralizing antibody responses induced in guinea pigs with 3 doses of the P2-P[8]?VP8* vaccine persisted for at least 6 months. Furthermore, in the gnotobiotic piglet challenge study, three intramuscular doses (50 ?g/dose) of the P2-P[8]?VP8* vaccine with aluminum phosphate adjuvant significantly delayed the onset of diarrhea and significantly reduced the duration of diarrhea and the cumulative diarrhea score after oral challenge with virulent human rotavirus Wa (G1P[8]) strain. The P2-P[8]?VP8* vaccine induced serum virus neutralizing antibody and VP4-specific IgG antibody production prechallenge, and primed the pigs for higher antibody and intestinal and systemic virus-specific IFN-? producing CD4(+) T cell responses postchallenge. These two subunit vaccines could be used at a minimum singly or preferably in bivalent formulation to provide antigenic coverage of most of the G types of global importance.

Project description:BackgroundEfficacy of live oral rotavirus vaccines is reduced in low-income compared with high-income settings. Parenteral non-replicating rotavirus vaccines might offer benefits over oral vaccines. We assessed the safety and immunogenicity of the P2-VP8-P[8] subunit rotavirus vaccine at different doses in South African toddlers and infants.MethodsThis double-blind, randomised, placebo-controlled, dose-escalation trial was done at a single research unit based at a hospital in South Africa in healthy HIV-uninfected toddlers (aged 2 to <3 years) and term infants (aged 6 to <8 weeks, without previous rotavirus vaccination). Block randomisation (computer-generated, electronic allocation) was used to assign eligible toddlers (in a 6:1 ratio) and infants (in a 3:1 ratio) in each dose cohort (10 μg, followed by 30 μg, then 60 μg if doses tolerated) to parenteral P2-VP8-P[8] subunit rotavirus or placebo injection. The two highest tolerated doses were then assessed in an expanded cohort (in a 1:1:1 ratio). Parents of participants and clinical, data, and laboratory staff were masked to treatment assignment. P2-VP8-P[8] vaccine versus placebo was assessed first in toddlers (single injection) and then in infants (three injections 4 weeks apart). The primary safety endpoints were local and systemic reactions within 7 days after each injection, adverse events within 28 days after each injection, and all serious adverse events, assessed in toddlers and infants who received at least one dose. In infants receiving all study injections, primary immunogenicity endpoints were anti-P2-VP8-P[8] IgA and IgG and neutralising antibody seroresponses and geometric mean titres 4 weeks after the third injection. This trial is registered at ClinicalTrials.gov, number NCT02109484.FindingsBetween March 17, 2014, and Sept 29, 2014, 42 toddlers (36 to vaccine and six to placebo) and 48 infants (36 to vaccine and 12 to placebo) were enrolled in the dose-escalation phase, in which the 30 μg and 60 μg doses where found to be the highest tolerated doses. A further 114 infants were enrolled in the expanded cohort between Nov 3, 2014, and March 20, 2015, and all 162 infants (12 assigned to 10 μg, 50 to 30 μg, 50 to 60 μg, and 50 to placebo) were included in the safety analysis. Serum IgA seroresponses were observed in 38 (81%, 95% CI 67-91) of 47 infants in the 30 μg group and 32 (68%, 53-81) of 47 in the 60 μg group, compared with nine (20%, 10-35) of 45 in the placebo group; adjusted IgG seroresponses were seen in 46 (98%, 89-100) of 47 infants in the 30 μg group and 47 (100%; 92-100) of 47 in the 60 μg group, compared with four (9%, 2·5-21) of 45 in the placebo group; and adjusted neutralising antibody seroresponses against the homologous Wa-strain were seen in 40 (85%, 72-94) of 47 infants in both the 30 μg and 60 μg groups, compared with three (7%, 1·4-18) of 45 participants in the placebo group. Solicited reactions following any injection occurred with similar frequency and severity in participants receiving vaccine and those receiving placebo. Unsolicited adverse events were mostly mild and occurred at a similar frequency between groups. Eight serious adverse events (one with placebo, two with 30 μg, and five with 60 μg) occurred in seven infants within 28 days of any study injection, none of which were deemed related to study treatment.InterpretationThe parenteral P2-VP8-P[8] vaccine was well tolerated and immunogenic in infants, providing a novel approach to vaccination against rotavirus disease. On the basis of these results, a phase 1/2 trial of a trivalent P2-VP8 (P[4], P[6], and P[8]) subunit vaccine is underway at three sites in South Africa.FundingBill & Melinda Gates Foundation.

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Tandem truncated rotavirus VP8* subunit protein with T cell epitope as non-replicating parenteral vaccine is highly immunogenic.

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Tandem truncated rotavirus VP8* subunit protein with T cell epitope as non-replicating parenteral vaccine is highly immunogenic.

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