Surface Grafted MSI-78A Antimicrobial Peptide has High Potential for Gastric Infection Management

• Published in: Scientific reports Vol. 9; no. 1; pp. 18212 - 11
• Main Authors: Parreira, Paula, Monteiro, Claudia, Graça, Vanessa, Gomes, Joana, Maia, Sílvia, Gomes, Paula, Gonçalves, Inês C., Martins, M. Cristina L.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 03-12-2019; Nature Publishing Group
• Subjects: 14/34; 14/63; 631/1647/2234; 631/61/2298; 631/61/54/990; 631/67/1504/1829; 692/699/255/1318; Antimicrobial agents; Antimicrobial Cationic Peptides - administration & dosage; Antimicrobial peptides; Bacteria; Biocompatible Materials - chemistry; Bioengineering; Biomaterials; Drug Delivery Systems - methods; Ethylene glycol; Helicobacter Infections - drug therapy; Helicobacter Infections - microbiology; Helicobacter pylori; Helicobacter pylori - drug effects; Humanities and Social Sciences; Humans; Microbial Sensitivity Tests; Minimum inhibitory concentration; multidisciplinary; Nanoparticles; Nanoparticles - chemistry; Nanotechnology; Peptides; Proof of Concept Study; Quartz crystal microbalance; Quartz Crystal Microbalance Techniques; Science; Science (multidisciplinary); Staphylococcus aureus - drug effects; Staphylococcus epidermidis; Stomach Diseases - drug therapy; Stomach Diseases - microbiology
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-019-53918-4

As we approach the end of the antibiotic era, newer therapeutic options, such as antimicrobial peptides (AMPs), are in urgent demand. AMP surface grafting onto biomaterials has been described as a good strategy to overcome problems associated with their
in vivo
stability.
Helicobacter pylori
is among the bacteria that pose greatest threat to human health, being MSI-78A one of the few bactericidal AMPs against this bacterium. Here, we report that MSI-78A grafted onto model surfaces (Self-Assembled Monolayers –SAMs), in a concentration of 30.3 ± 1.2 ng/cm
2
determined by quartz crystal microbalance with dissipation (QCM-D), was able to kill, by contact, 98% of planktonic
H. pylori
in only 2 h. This fact was not verified against the control bacteria (
Staphylococcus epidermidis
), although the minimal inhibitory concentration (MIC) of MSI-78A in solution is much lower for
S. epidermidis
(2 μg/mL) than for
H. pylori
(64 μg/mL). Our results also demonstrated that, in opposite to other bacteria,
H. pylori
cells were attracted to ethylene glycol terminated (antiadhesive) surfaces, which can explain the high bactericidal potential of grafted MSI-78A. This proof of concept study establishes the foundations for development of MSI-78A grafted nanoparticles for gastric infection management within a targeted nanomedicine concept.