Back to Journals » International Journal of Nanomedicine » Volume 8 » Issue 1

Formulation, characterization, and expression of a recombinant MOMP Chlamydia trachomatis DNA vaccine encapsulated in chitosan nanoparticles

Authors Cambridge CD, Singh SR, Waffo AB, Fairley SJ, Dennis VA

Received 13 January 2013

Accepted for publication 16 February 2013

Published 10 May 2013 Volume 2013:8(1) Pages 1759—1771


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Chino D Cambridge, Shree R Singh, Alain B Waffo, Stacie J Fairley, Vida A Dennis

Center for NanoBiotechnology Research (CNBR), Alabama State University, Montgomery, AL, USA

Abstract: Chlamydia trachomatis is a bacterial sexually transmitted infection affecting millions of people worldwide. Previous vaccination attempts have employed the recombinant major outer membrane protein (MOMP) of C. trachomatis nonetheless, with limited success, perhaps, due to stability, degradation, and delivery issues. In this study we cloned C. trachomatis recombinant MOMP DNA (DMOMP) and encapsulated it in chitosan nanoparticles (DMCNP) using the complex coacervation technique. Physiochemical characterizations of DMCNP included transmission and scanning electron microcopy, Fourier transform infrared and ultraviolet-visible spectroscopy, and zeta potential. Encapsulated DMOMP was 167–250 nm, with a uniform spherical shape and homogenous morphology, and an encapsulation efficiency > 90%. A slow release pattern of encapsulated DMOMP, especially in acidic solution, was observed over 7 days. The zeta potential of DMCNP was ~8.80 mV, which indicated that it was highly stable. Toxicity studies of DMCNP (25–400 µg/mL) to Cos-7 cells using the MTT assay revealed minimal toxicity over 24–72 hours with >90% viable cells. Ultra-violet visible (UV-vis) spectra indicated encapsulated DMOMP protection by chitosan, whereas agarose gel electrophoresis verified its protection from enzymatic degradation. Expression of MOMP protein in DMCNP-transfected Cos-7 cells was demonstrated via Western blotting and immunofluorescence microscopy. Significantly, intramuscular injection of BALB/c mice with DMCNP confirmed the delivery of encapsulated DMOMP, and expression of the MOMP gene transcript in thigh muscles and spleens. Our data show that encapsulation of DMOMP in biodegradable chitosan nanoparticles imparts stability and protection from enzymatic digestion, and enhances delivery and expression of DMOMP in vitro and in mice. Further investigations of the nanoencapsulated DMCNP vaccine formulation against C. trachomatis in mice are warranted.

Keywords: Chlamydia trachomatis, bacteria, chitosan, DNA, MOMP, vaccine

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.

Download Article [PDF]  View Full Text [HTML][Machine readable]


Other articles by this author:

Readers of this article also read:

Molecular targets in arthritis and recent trends in nanotherapy

Roy K, Kanwar RK, Kanwar JR

International Journal of Nanomedicine 2015, 10:5407-5420

Published Date: 26 August 2015

Comparative efficacy and safety of local and systemic methotrexate injection in cesarean scar pregnancy

Peng P, Gui T, Liu X, Chen W, Liu Z

Therapeutics and Clinical Risk Management 2015, 11:137-142

Published Date: 27 January 2015

Is increasing the dose of Entecavir effective in partial virological responders?

Erturk A, Adnan Akdogan R, Parlak E, Cure E, Cumhur Cure M, Ozturk C

Drug Design, Development and Therapy 2014, 8:621-625

Published Date: 29 May 2014

Photodynamic therapy of a 2-methoxyestradiol tumor-targeting drug delivery system mediated by Asn-Gly-Arg in breast cancer

Shi J, Wang Z, Wang L, Wang H, Li L, Yu X, Zhang J, Ma R, Zhang Z

International Journal of Nanomedicine 2013, 8:1551-1562

Published Date: 19 April 2013

Controlled-release approaches towards the chemotherapy of tuberculosis

Saifullah B, Hussein MZ, Hussein Al Ali SH

International Journal of Nanomedicine 2012, 7:5451-5463

Published Date: 12 October 2012

Cross-linked acrylic hydrogel for the controlled delivery of hydrophobic drugs in cancer therapy

Deepa G, Thulasidasan AK, Anto RJ, Pillai JJ, Kumar GS

International Journal of Nanomedicine 2012, 7:4077-4088

Published Date: 27 July 2012