Impact of different cell penetrating peptides on the efficacy of antisense therapeutics for targeting intracellular pathogens.

Abstract:

:There is a pressing need for novel and innovative therapeutic strategies to address infections caused by intracellular pathogens. Peptide nucleic acids (PNAs) present a novel method to target intracellular pathogens due to their unique mechanism of action and their ability to be conjugated to cell penetrating peptides (CPP) to overcome challenging delivery barriers. In this study, we targeted the RNA polymerase α subunit (rpoA) using a PNA that was covalently conjugated to five different CPPs. Changing the conjugated CPP resulted in a pronounced improvement in the antibacterial activity observed against Listeria monocytogenes in vitro, in cell culture, and in a Caenorhabditis elegans (C. elegans) infection model. Additionally, a time-kill assay revealed three conjugated CPPs rapidly kill Listeria within 20 minutes without disrupting the bacterial cell membrane. Moreover, rpoA gene silencing resulted in suppression of its message as well as reduced expression of other critical virulence genes (Listeriolysin O, and two phospholipases plcA and plcB) in a concentration-dependent manner. Furthermore, PNA-inhibition of bacterial protein synthesis was selective and did not adversely affect mitochondrial protein synthesis. This study provides a foundation for improving and developing PNAs conjugated to CPPs to better target intracellular pathogens.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Abushahba MF,Mohammad H,Thangamani S,Hussein AA,Seleem MN

doi

10.1038/srep20832

subject

Has Abstract

pub_date

2016-02-10 00:00:00

pages

20832

issn

2045-2322

pii

srep20832

journal_volume

6

pub_type

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