Abstract
The present study reports the tetanus toxoid (TT)-loaded layer-by-layer nanoassemblies (layersomes) with enhanced protection, permeation, and presentation for comprehensive oral immunization. The stable and lyophilized TT-loaded layersomes were prepared by a thin-film hydration method followed by alternate layer-by-layer coating of an electrolyte. The developed system was assessed for in vitro stability of antigen and formulation, cellular uptake, ex vivo intestinal uptake, and immunostimulatory response using a suitable experimental protocol. Layersomes improved the stability in simulated biological media as well as protected the integrity/conformation and native 3D structure of TT as confirmed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), circular dichroism (CD), and fluorescence spectroscopy, respectively. The cell culture studies demonstrated a 3.8-fold higher permeation of layersomes in Caco-2 cells and an 8.5-fold higher uptake by antigen-presenting cells (RAW 264.7). The TT-loaded layersomes elicited a complete immunostimulatory profile consisting of higher systemic (serum IgG titer), mucosal (sIgA titer), and cellular (interleukin-2 (IL-2) and interferon-γ (IFN-γ) levels) immune response after peroral administration in mice. The modified TT inhibition assay further confirmed the elicitation of complete protective levels of anti-TT antibody (>0.1 IU/mL) by layersomes. In conclusion, the proposed strategy is expected to contribute significantly in the field of stable liposome technology for mass immunization through the oral route.
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Acknowledgments
The authors are grateful to the Department of Biotechnology (DBT), Government of India, New Delhi, India, for providing financial support and to the Director, NIPER, for providing the necessary infrastructure facilities. The authors are also grateful to Dr. M. L Mago and Lavit Jambu for gift samples of tetanus toxoid and training facility provided at Panacea Biotech Ltd., India. Technical assistance provided by Mr. Rahul Mahajan in SEM analysis and Mr. Vinod Kumar in TEM analysis is also duly acknowledged.
Conflict of interest
The authors declare that they have no competing interests.
Compliance with Ethical Standards
All animal protocols were duly approved by the Institutional Animal Ethics Committee and Institutional Biosafety Committee of NIPER, SAS Nagar, India, and completed under the guidelines of the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA).
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Harde, H., Agrawal, A.K. & Jain, S. Tetanus toxoid-loaded layer-by-layer nanoassemblies for efficient systemic, mucosal, and cellular immunostimulatory response following oral administration. Drug Deliv. and Transl. Res. 5, 498–510 (2015). https://doi.org/10.1007/s13346-015-0247-x
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DOI: https://doi.org/10.1007/s13346-015-0247-x