BACKGROUND: A monoclonal antibody (mAb) 2F5 binds to the membrane-proximal external region (MPER) of the transmembrane subunit gp41 of human immunodeficiency virus type 1 (HIV-1) is known to broadly neutralize HIV-1 strains. The Adenovirus type 5 vector (Ad5) has been widely applied for HIV-1 vaccine, and hexon hypervariable region 5 (HVR5) is exposed on viral surface and easily target host immune responses against Ad5. METHODS: We constructed a recombinant adenovirus type 5 vector (rAd5) with a 2F5-binding epitope (ELDKWA) of MPER on Ad5-HVR5. In addition, we developed rAd5 encoding the HIV-1(IIIB) envelope (Env) gene for the induction of Env-specific cellular immunity. RESULTS: The virus titers of the constructed rAd5 were similar to that of the parental Ad5 vector. Furthermore, high-dose immunization of rAd5 induced Env-specific CD8(+) cells and high levels of anti-ELDKWA antibodies. Moreover, an in vitro HIV-1 neutralization assay indicated that ELDKWA-specific mAbs derived from rAd5-immunized mice neutralized a wide range of HIV-1 strains. CONCLUSIONS: The present study outlines the development of an Ad5-based HIV-1 vaccine targeting the hypervariable regions of Ad5. The constructed rAd5 induced an HIV-1-specific cellular immune response and neutralizing antibodies against various strains of HIV-1 simultaneously. Copyright (c) 2008 John Wiley & Sons, Ltd.
BACKGROUND: A monoclonal antibody (mAb) 2F5 binds to the membrane-proximal external region (MPER) of the transmembrane subunit gp41 of human immunodeficiency virus type 1 (HIV-1) is known to broadly neutralize HIV-1 strains. The Adenovirus type 5 vector (Ad5) has been widely applied for HIV-1 vaccine, and hexon hypervariable region 5 (HVR5) is exposed on viral surface and easily target host immune responses against Ad5. METHODS: We constructed a recombinant adenovirus type 5 vector (rAd5) with a 2F5-binding epitope (ELDKWA) of MPER on Ad5-HVR5. In addition, we developed rAd5 encoding the HIV-1(IIIB) envelope (Env) gene for the induction of Env-specific cellular immunity. RESULTS: The virus titers of the constructed rAd5 were similar to that of the parental Ad5 vector. Furthermore, high-dose immunization of rAd5 induced Env-specific CD8(+) cells and high levels of anti-ELDKWA antibodies. Moreover, an in vitro HIV-1 neutralization assay indicated that ELDKWA-specific mAbs derived from rAd5-immunized mice neutralized a wide range of HIV-1 strains. CONCLUSIONS: The present study outlines the development of an Ad5-based HIV-1 vaccine targeting the hypervariable regions of Ad5. The constructed rAd5 induced an HIV-1-specific cellular immune response and neutralizing antibodies against various strains of HIV-1 simultaneously. Copyright (c) 2008 John Wiley & Sons, Ltd.
Authors: Karl W Boehme; Mine' Ikizler; Jason A Iskarpatyoti; J Denise Wetzel; Jordan Willis; James E Crowe; Celia C LaBranche; David C Montefiori; Gregory J Wilson; Terence S Dermody Journal: mSphere Date: 2016-05-18 Impact factor: 4.389