<i>In vitro</i> activity of cationic peptides against <i>Neisseria gonorrhoeae</i> and vaginal <i>Lactobacillus</i> species: The effect of divalent cations — Oak Academic Publishing
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<i>In vitro</i> activity of cationic peptides against <i>Neisseria gonorrhoeae</i> and vaginal <i>Lactobacillus</i> species: The effect of divalent cations
Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh, Pittsburgh, USA
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Department of Molecular Genetics and Biochemistry, University of Pittsburgh, School of Medicine, Biomedical Sciences Tower, Pittsburgh, USA
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Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh, Pittsburgh, USA
1 Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh, Pittsburgh, USA
2 Department of Molecular Genetics and Biochemistry, University of Pittsburgh, School of Medicine, Biomedical Sciences Tower, Pittsburgh, USA
3 Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh, Pittsburgh, USA
One of the new strategies for the prevention of HIV acquisition is the use of microbicides such as topical microbicides including antimicrobial and antiviral peptides. Ideally, new drug candidates should kill pathogens without determent to the normal bacterial flora considered important in health; such as hydrogen peroxide producing Lactobacillus species. The antimicrobial peptides LL-37 and LSA-5 were studied to determine their spectrum of activity against bacterial pathogens and normal flora organisms. The effects of divalent cations at biologically relevant concentrations were determined. We show the synthetic lytic peptide LSA-5 and the naturally occurring peptides LL-37 inactivate Neisseria gonorrhoeae but are less active against many normal flora members such as Lactobacillus species. Biologically relevant concentrations of calcium and magnesium prevented killing of sensitive strains. LSA-5 is more potent than LL-37, both are inhibited from killing sensitive strains by calcium and magnesium. Strains of Lactobacillus iners were killed by both microbicides even in the presence of the divalent cations. Antimicrobial peptides, such as LSA-5, have good potential for use in prevention of sexually transmitted disease, if formulated to sequester calcium and magnesium present in biological fluids.
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