Flying vaccinator; a transgenic mosquito delivers a Leishmania vaccine via blood feeding

Authors

  • D. S. Yamamoto,

    1. Division of Medical Zoology, Department of Infection and Immunity, Jichi Medical University, 3311-1 Yakushiji Shimotsuke, Tochigi, 329-0498, Japan
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  • H. Nagumo,

    1. Division of Medical Zoology, Department of Infection and Immunity, Jichi Medical University, 3311-1 Yakushiji Shimotsuke, Tochigi, 329-0498, Japan
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  • S. Yoshida

    1. Division of Medical Zoology, Department of Infection and Immunity, Jichi Medical University, 3311-1 Yakushiji Shimotsuke, Tochigi, 329-0498, Japan
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Shigeto Yoshida, Division of Medical Zoology, Department of Infection and Immunity, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0498, Japan. Tel.: +81 285 58 7339; fax: +81 285 44 6489; e-mail: shigeto@jichi.ac.jp

Abstract

‘Flying vaccinator’ is the concept of using genetically engineered hematophagous insects to deliver vaccines. Here we show the generation of a transgenic anopheline mosquito that expresses the Leishmania vaccine candidate, SP15, fused to monomeric red fluorescent protein (mDsRed) in its salivary glands. Importantly, mice bitten repeatedly by the transgenic mosquitoes raised anti-SP15 antibodies, indicating delivery of SP15 via blood feeding with its immunogenicity intact. Thus, this technology makes possible the generation of transgenic mosquitoes that match the original concept of a ‘flying vaccinator’. However, medical safety issues and concerns about informed consent mitigate the use of the ‘flying vaccinator’ as a method to deliver vaccines. We propose that this expression system could be applied to elucidate saliva–malaria sporozoite interactions.

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