Nano-multilamellar lipid vesicles loaded with a recombinant form of the chikungunya virus E2 protein improve the induction of virus-neutralizing antibodies

Nanomedicine. 2021 Oct:37:102445. doi: 10.1016/j.nano.2021.102445. Epub 2021 Jul 22.

Abstract

Chikungunya virus (CHIKV) is responsible for a self-limited illness that can evolve into long-lasting painful joint inflammation. In this study, we report a novel experimental CHIKV vaccine formulation of lipid nanoparticles loaded with a recombinant protein derived from the E2 structural protein. This antigen fragment, designated ∆E2.1, maintained the antigenicity of the native viral protein and was specifically recognized by antibodies induced in CHIKV-infected patients. The antigen has been formulated into nanoparticles consisting of nano-multilamellar vesicles (NMVs) combined with the adjuvant monophosphoryl lipid A (MPLA). The vaccine formulation demonstrated a depot effect, leading to controlled antigen release, and induced strong antibody responses significantly higher than in mice immunized with the purified protein combined with the adjuvant. More relevantly, E2-specific antibodies raised in mice immunized with ∆E2.1-loaded NMV-MPLA neutralized CHIKV under in vitro conditions. Taken together, the results demonstrated that the new nanoparticle-based vaccine formulation represents a promising approach for the development of effective anti-CHIKV vaccines.

Keywords: CHIKV; Chikungunya; MPLA; NMVs; Nanovaccine.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Neutralizing / biosynthesis
  • Antibodies, Neutralizing / drug effects
  • Antibodies, Neutralizing / immunology
  • Antibodies, Viral / biosynthesis
  • Antibodies, Viral / drug effects
  • Antibodies, Viral / immunology
  • Chikungunya Fever / immunology*
  • Chikungunya Fever / therapy
  • Chikungunya Fever / virology
  • Chikungunya virus / immunology*
  • Chikungunya virus / pathogenicity
  • Humans
  • Liposomes / chemistry
  • Liposomes / immunology*
  • Liposomes / pharmacology
  • Mice
  • Nanoparticles / chemistry
  • Viral Envelope Proteins / genetics*
  • Viral Envelope Proteins / pharmacology
  • Viral Vaccines / immunology

Substances

  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Lipid Nanoparticles
  • Liposomes
  • Viral Envelope Proteins
  • Viral Vaccines