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DNA vaccination boosts Bacillus Calmette-Guérin protection against mycobacterial infection in zebrafish.

Dev. Comp. Immunol.2016 Jan;54(1):89-96. Epub 2015 Sep 09
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摘要


Despite the widespread use of the current Bacillus Calmette-Guérin (BCG) vaccine, tuberculosis is still a major cause of morbidity and mortality worldwide. Vaccination with BCG does not prevent a Mycobacterium tuberculosis infection, nor does it inhibit the reactivation of latent tuberculosis. Here, we show that adult zebrafish are modestly and variably protected from a mycobacterial infection by BCG vaccination. An intraperitoneal (i.p.) BCG vaccination was associated with enhanced survival upon a high-dose (20,000 bacteria) Mycobacterium marinum infection. In addition, BCG-vaccinated fish were more able to restrict a low-dose (30 bacteria) intraperitoneal infection with M. marinum, as indicated by lower bacterial loads at six weeks post infection (wpi). However, the vaccination could not completely prevent an infection. A qRT-PCR analysis comparing BCG-vaccinated and unvaccinated fish upon a mycobacterial infection indicated that the induction of Tumor necrosis factor (TNF) was more modest in vaccinated fish. The partial protection gained by BCG could be boosted by a DNA vaccine combining Ag85B, ESAT6 and a resuscitation-related gene RpfE, suggesting that this combination of antigens could be useful for a future BCG booster vaccine. We conclude that zebrafish is a useful early-phase preclinical model for studying subunit vaccines designed for boosting the effects of BCG.

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