Antibacterial Properties of Tebipenem Pivoxil Tablet, a New Oral Carbapenem Preparation against a Variety of Pathogenic Bacteria in Vitro and in VivoReport as inadecuate




Antibacterial Properties of Tebipenem Pivoxil Tablet, a New Oral Carbapenem Preparation against a Variety of Pathogenic Bacteria in Vitro and in Vivo - Download this document for free, or read online. Document in PDF available to download.

1

Department of Pharmacology, Yunnan Institute of Materia Medica, Kunming 650111, China

2

Department of GLP, Yunnan Institute of Materia Medica, Kunming 650111, China

3

Department of Scientific Management, Yunnan Institute of Materia Medica, Kunming 650111, China

4

Department of Chemical Pharmaceutics, Yunnan Institute of Materia Medica, Kunming 650111, China





*

Author to whom correspondence should be addressed.



Academic Editor: Derek J. McPhee

Abstract Aims: To systemically investigate the in vitro and in vivo antibacterial properties of tebipenem pivoxil tablet. In addition, acute toxicity of this preparation was also studied. Methods: In vitro, minimum inhibitory concentration MIC or minimal inhibitory concentration MBC were determined by using the serial 2-fold broth or agar dilution methods. Further, cumulative MIC inhibition curves were then made to assess the antibacterial effects of the drug at various concentrations. In vivo, minimum lethal dose MLD in combination with maximum tolerance dose MTD was used to measure the acute toxicity of the tebipenem pivoxil tablet in mice. After that, sepsis mouse models challenged with Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Klebsiella pneumoniae, respectively, were established to evaluate the anti-infective effect of this preparation. Results: The MIC90 values of tebipenem pivoxil against Gram-positive bacteria such as methicillin-sensitive Staphylococcus aureus MSSA, methicillin-resistant Staphylococcus aureus MRSA, methicillin-sensitive Staphylococcus epidermidis MSSE, methicillin-resistant Staphylococcus epidermidis MRSE, Pyogenic streptococcus, and Enterococcus faecalis were ≤0.125, 16, 0.5, 8, ≤0.125, and 32 μg-mL, respectively. Correspondingly, the MIC90 values of tebipenem pivoxil against Escherichia coli, Klebsiella pneumoniae, Enterobacter aerogenes, Haemophilus influenzae, Pseudomonas aeruginosa, and Acinetobacter baumannii were 1, 0.5, ≤0.125, 0.25, 64, 64 μg-mL, respectively. The MBC values of tebipenem pivoxil against Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae were 0.016–2, 0.063–32, 0.031–32 μg-mL, respectively. The acute toxicity study showed that the MLD of the tebipenem pivoxil tablet was 4.00 g-kg and the MTD was 3.40 g-kg in mice. In all the sepsis mouse models, the simultaneous administration of the tebipenem pivoxil tablets significantly reduced mortality of the sepsis-model mice as compared with the control. Furthermore, the survival rate in the tebipenem pivoxil tablet group was remarkably higher than that in the meropenem group in all the sepsis mouse models tested. In the sepsis model challenged with Staphylococcus aureus ATCC29213, Escherichia coli ATCC25922, Pseudomonas aeruginosa ATCC27853, and Pseudomonas aeruginosa clinical strain, respectively, tebipenem pivoxil tablet 100 mg-kg displayed a better protective effect than tebipenem pivoxil granules 100 mg-kg. Conclusions: In summary, tebipenem pivoxil displays an excellent antibacterial activity against a variety of pathogenic bacteria in vitro. Importantly, tebipenem pivoxil tablet significantly protects the sepsis mice challenged with various pathogenic bacteria, which may provide a potential approach to treating bacterial sepsis in clinic. View Full-Text

Keywords: tebipenem pivoxil; pathogenic bacteria; MIC; 100% MLD; bacterial sepsis tebipenem pivoxil; pathogenic bacteria; MIC; 100% MLD; bacterial sepsis





Author: Qi Yao 1, Jingkun Wang 2, Tao Cui 3, Zhi Yang 4,* , Mei Su 1, Peiyue Zhao 4, Hong Yan 1, Yi Zhan 1 and Hongbo Yang 2

Source: http://mdpi.com/



DOWNLOAD PDF




Related documents