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Constructing Mutants in Serotype 1 Streptococcus pneumoniae strain 519/43
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Penicillin facilitates the entry of antisense constructs into Streptococcus mutans
Felicity S A McLeod1, Robin S Simmonds
1Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand.
FEMS Microbiology Letters
|October 12, 2013
Summary
Penicillin treatment enhances antisense oligonucleotide delivery into Streptococcus mutans by disrupting the peptidoglycan layer, enabling gene silencing and prolonged growth suppression. This strategy overcomes bacterial cell barriers for potential antimicrobial applications.
Area of Science:
- Microbiology
- Molecular Biology
- Antimicrobial Research
Background:
- Antisense oligonucleotides (AS-ODN) show promise as sequence-specific antimicrobial agents.
- Bacterial cell wall components, like peptidoglycan, impede AS-ODN entry, limiting therapeutic efficacy.
- Streptococcus mutans possesses a significant peptidoglycan layer, posing a challenge for AS-ODN delivery.
Discussion:
- Penicillin, a β-lactam antibiotic, was investigated for its capacity to facilitate phosphorothioate oligodeoxyribonucleotide (PS-ODN) delivery into S. mutans.
- Co-administration of penicillin with an FBA-targeting PS-ODN resulted in sustained growth inhibition (>24h) and significant fba gene expression reduction.
- Increased intracellular accumulation of radiolabeled ODN was observed post-penicillin treatment, indicating enhanced cellular uptake.
Key Insights:
- The peptidoglycan layer of S. mutans is a primary obstacle to AS-ODN penetration.
- Penicillin effectively disrupts peptidoglycan integrity, thereby increasing PS-ODN uptake.
- This synergistic approach demonstrates a viable method for delivering AS-ODNs into bacteria.
Outlook:
- This method holds potential for developing novel antimicrobial therapies targeting specific genes in S. mutans and other Gram-positive bacteria.
- Further research can explore optimizing penicillin concentrations and other cell wall-disrupting agents for enhanced AS-ODN delivery.
- Investigating the long-term effects and spectrum of activity of this delivery system is crucial for clinical translation.
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