1. Academic Validation
  2. In vitro activity of TNP-2092 against periprosthetic joint infection-associated staphylococci

In vitro activity of TNP-2092 against periprosthetic joint infection-associated staphylococci

  • Diagn Microbiol Infect Dis. 2020 Jul;97(3):115040. doi: 10.1016/j.diagmicrobio.2020.115040.
Cody R Fisher 1 Suzannah M Schmidt-Malan 1 Zhenkun Ma 2 Ying Yuan 2 Shijie He 2 Robin Patel 3
Affiliations

Affiliations

  • 1 Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.
  • 2 TenNor Therapeutics Limited, Suzhou, China.
  • 3 Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN; Division of Infectious Diseases, Department of Medicine, Mayo Clinic, Rochester, MN. Electronic address: patel.robin@mayo.edu.
Abstract

Staphylococci are the most common causes of periprosthetic joint Infection (PJI). TNP-2092 is an investigational hybrid drug composed of rifamycin and quinolizinone pharmacophores conjugated via a covalent linker. We determined minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and minimum biofilm bactericidal concentration (MBBC) values of TNP-2092 against 80 PJI-associated Staphylococcus aureus and Staphylococcus epidermidis isolates compared to ciprofloxacin and rifampin alone and in combination, alongside daptomycin and vancomycin. TNP-2092 exhibited the following activity against S. aureus: MIC50/MIC90, ≤0.0075/0.015 μg/mL; MBC50/MBC90, 0.5/4 μg/mL; and MBBC50/MBBC90, 0.5/2 μg/mL, and the following activity against S. epidermidis: MIC50/MIC90, ≤0.0075/0.015 μg/mL; MBC50/MBC90, 0.015/0.125 μg/mL; and MBBC50/MBBC90, 0.06/0.25 μg/mL. TNP-2092 MIC, MBC, and MBBC values were >8 μg/mL for 1 isolate, while MIC values were ≤0.25 μg/mL and MBC and MBBC values were ≤4 μg/mL for all other isolates. Results of this study show that TNP-2092 has promising in vitro activity against PJI-associated staphylococci.

Keywords

Periprosthetic joint infection; Staphylococcus aureus; Staphylococcus epidermidis; TNP-2092.

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