TXA497 as a topical antibacterial agent: Comparative antistaphylococcal, skin deposition, and skin permeation studies with mupirocin

Mania Dorrani, Malvika Kaul, Ajit Parhi, Edmond J. Lavoie, Daniel S. Pilch, Bozena Michniak-Kohn

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

TXA497 is representative of a new class of guanidinomethyl biaryl compounds that exhibit potent bactericidal behavior against methicillin-resistant Staphylococcus aureus (MRSA). In this study, we compared the anti-staphylococcal, skin deposition, and skin permeation properties of TXA497 and the topical anti-MRSA antibiotic mupirocin. The results of minimum inhibitory concentration (MIC) assays revealed that TXA497 retains potent activity against MRSA that is highly resistant to mupirocin. Using Franz diffusion cells, compound deposition into human cadaver skin was evaluated, and the results showed the skin deposition of TXA497 to be significantly greater than that of mupirocin. Moreover, unlike mupirocin, TXA497 does not pass through the entire skin layer, suggesting a minimal potential for the systemic absorption of the compound upon topical administration. Additionally, antibacterial concentrations of TXA497 showed no significant toxicity to primary human keratinocytes. Given the rising levels of mupirocin resistance among MRSA populations, our results are significant in that they highlight TXA497 as a potentially useful alternative therapy for treating MRSA skin infections that are resistant to mupirocin.

Original languageEnglish (US)
Pages (from-to)199-204
Number of pages6
JournalInternational Journal of Pharmaceutics
Volume476
Issue number1
DOIs
StatePublished - Dec 10 2014

All Science Journal Classification (ASJC) codes

  • Pharmaceutical Science

Keywords

  • MRSA
  • MSSA
  • Mupirocin
  • Skin permeation
  • TXA497
  • Topical anti-bacterial

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