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Evaluation of recombinant E2 protein-based and whole-virus inactivated candidate vaccines against chikungunya virus.

Abstract：

OBJECTIVES:With the re-emergence of chikungunya virus (CHIKV) in an explosive form and in the absence of a commercially available vaccine, we aimed to develop candidate vaccines employing recombinant E2 protein or chemically inactivated whole virus. DESIGN AND METHODS:E2 gene of CHIKV isolate of ECSA genotype was cloned in pET15b vector, expressed and purified (rE2p). The virus was propagated in Vero cell line, purified and inactivated with formalin and BPL individually. Six to eight weeks old female BALB/c mice were immunized intramuscularly with two doses of 10μg, 20μg and 50μg of vaccine formulations with or without adjuvants, 2 weeks apart. The adjuvants evaluated were alum, Mw, CadB (rE2p), alum/Mw (formalin inactivated CHIKV) and alum (BPL-inactivated CHIKV). Humoral immunity was assessed by ELISA and in vitro neutralization test using homologous and heterologous (Asian genotype) strains of CHIKV. Two cohorts of vaccinated mice were challenged separately via intranasal route with homologous virus two and 20 weeks after the 2nd dose. Viral load (CHIKV RNA by real time PCR) was determined in the serum and tissues (muscle, brain, spleen) of the mice challenged with the homologous virus. RESULTS:Anti-CHIK-antibody titres were dose dependent for all the immunogen formulations. BPL-inactivated vaccines led to the highest ELISA/neutralizing antibody (nAb) titres while alum was the most effective adjuvant. Asian genotype strain could be neutralized by the nAbs. In an adult mouse model, complete protection was offered by the alum-adjuvanted rE2p and both the inactivated vaccines as no virus was detected in the tissues and blood after challenge 2 weeks or 20 weeks-post-2nd dose. However, with rE2p-CadB, very low viremia was recorded on the 2nd day-post-challenge. CONCLUSION:Both rE2p and BPL/formalin-inactivated virus are promising candidate vaccines deserving further evaluation.

journal_name

Vaccine

journal_title

Vaccine

authors

Kumar M,Sudeep AB,Arankalle VA

doi

10.1016/j.vaccine.2012.07.072

subject

Has Abstract

pub_date

2012-09-21 00:00:00

pages

6142-9

issue

43

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(12)01107-3

journal_volume

30

pub_type

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