Cubosomes post-loaded with antimicrobial peptides: Characterization, bactericidal effect and proteolytic stability
Journal article, 2017

Novel antibiotics, such as antimicrobial peptides (AMPs), have recently attended more and more attraction. In this work, dispersed cubic liquid crystalline gel (cubosomes) was used as drug delivery vehicles for three AMPs (AP114, DPK-060 and LL-37). Association of peptides onto cubosomes was studied at two cubosome/peptide ratios using high performance liquid chromatography, ?-potential and circular dichroism measurements. AMPs impact on the cubosome structure was investigated using small angle x-ray scattering and cryogenic transmission electron microscopy. The antimicrobial effect of the AMP loaded cubosomes was studied in vitro by minimum inhibitory concentration and time-kill assays. Proteolytic protection was investigated by incubating the formulations with two elastases and the antimicrobial effect after proteolysis was studied using radial diffusion assay. Different association efficacy onto the cubosomes was observed among the AMPs, with LL-37 showing greatest association (>60%). AP114 loaded cubosomes displayed a preserved antimicrobial effect, whereas for LL-37 the broad spectrum bacterial killing was reduced to only comprise Gram-negative bacteria. Interestingly, DPK-060 loaded cubosomes showed a slight enhanced effect against S. aureus and E. coli strains. Moreover, the cubosomes were found to protect LL-37 from proteolytic degradation, resulting in a significantly better bactericidal effect after being subjected to elastase, compared to unformulated peptide.

Cubosome

Liquid crystalline nanoparticle

Glycerol monooleate

Antimicrobial peptide

Amp

Proteolysis

Author

Lukas Boge

Chalmers, Chemistry and Chemical Engineering

Anita Umerska

Micro et Nanomedecines Biomimetiques

Nada Matougui

Micro et Nanomedecines Biomimetiques

Helena Bysell

Technical Research Institute of Sweden

Lovisa Ringstad

Technical Research Institute of Sweden

Mina Davoudi

Lund University

Jonny Eriksson

Uppsala University

Katarina Edwards

Uppsala University

Martin Andersson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Applied Surface Chemistry

International Journal of Pharmaceutics

0378-5173 (ISSN)

Vol. 526 1-2 400-412

Subject Categories

Physical Chemistry

DOI

10.1016/j.ijpharm.2017.04.082

More information

Latest update

9/6/2018 2