Asmaa A.A. Hussein

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

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.

The low level of organizational social capital in hotels - a New Zealand case study.

Hotels, like other organizations, are constantly seeking to increase productivity; however, achieving this can be more challenging for service sectors organizations. Developing and maintaining a positive level of Organizational Social Capital (OSC)—an organizations soft asset—is said to be a productivity enhancement strategy; therefore, measuring and monitoring OSC is important. This research presents the New Zealand hotel industrys first measurement of OSC level. This is the initial stage within a longitudinal study to understand how OSC impacts productivity. A total of 509 employees from 31 hotels participated in this research, with the major finding and concern being the low level of OSC.