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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 \u03b1 subunit (\n                    <jats:italic>rpo<\/jats:italic>\n                    A) 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\n                    <jats:italic>Listeria monocytogenes in vitro<\/jats:italic>\n                    , in cell culture and in a\n                    <jats:italic>Caenorhabditis elegans<\/jats:italic>\n                    (\n                    <jats:italic>C. elegans<\/jats:italic>\n                    ) infection model. Additionally, a time-kill assay revealed three conjugated CPPs rapidly kill\n                    <jats:italic>Listeria<\/jats:italic>\n                    within 20\u2009minutes without disrupting the bacterial cell membrane. Moreover,\n                    <jats:italic>rpo<\/jats:italic>\n                    A gene silencing resulted in suppression of its message as well as reduced expression of other critical virulence genes (Listeriolysin O and two phospholipases\n                    <jats:italic>plc<\/jats:italic>\n                    A and\n                    <jats:italic>plc<\/jats:italic>\n                    B) 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.\n                  <\/jats:p>","DOI":"10.1038\/srep20832","type":"journal-article","created":{"date-parts":[[2016,2,10]],"date-time":"2016-02-10T06:55:20Z","timestamp":1455087320000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":82,"title":["Impact of different cell penetrating peptides on the efficacy of antisense therapeutics for targeting intracellular pathogens"],"prefix":"10.1038","volume":"6","author":[{"given":"Mostafa F. 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