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Nasal delivery of PLG microparticle encapsulated defensin peptides adjuvanted gp41 antigen confers strong and long-lasting immunoprotective response against HIV-1

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Abstract

Defensins display immunostimulatory activities including a chemotactic effect for T lymphocytes/immature dendritic cells and secretion of pro-inflammatory cytokines suggest their role in bridging innate and adaptive immunity. We hypothesized whether defensins with separately emulsified HIV-1 immunogen would elicit peptide-specific systemic and mucosal antibody response in mice. The HIV-1 peptide alone in microsphere showed low peptide-specific antibody response in sera and different washes, while the presence of defensins markedly increased the antibody peak titre both in sera (102,400–409,600) (p < 0.05) and in washes (800–25,600) (p < 0.001). Defensins with HIV-1 peptide were showing 43.0–83.2 % and 38.7–72.3 % in vitro neutralization against laboratory isolates in serum and lavage samples, respectively, higher than HIV-1 peptide alone. Our findings may have implications in the development of new mucosal adjuvant for AIDS vaccination.

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Acknowledgments

The authors wish to acknowledge ICMR-DBT, Govt. of India for providing financial assistance and carry out the work. Dr. Teena Mohan is thankful to UGC, Govt. of India to provide junior/senior research scholarships.

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Correspondence to D. N. Rao.

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Mohan, T., Mitra, D. & Rao, D.N. Nasal delivery of PLG microparticle encapsulated defensin peptides adjuvanted gp41 antigen confers strong and long-lasting immunoprotective response against HIV-1. Immunol Res 58, 139–153 (2014). https://doi.org/10.1007/s12026-013-8428-5

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