Abstract
Background: The translation of Pharmacokinetics (PK)/Pharmacodynamics (PD) from preclinical models to the clinic has not been studied in detail for drugs used to treat complicated urinary tract infections (cUTI).
Objective: The PK/PD of Ciprofloxacin (CIP), a drug used to treat cUTI, was evaluated in a mouse model of cUTI infected with Escherichia coli, and compared with clinical PK/PD in cUTI patients.
Methods: Streptozotocin induced diabetic female BALB/c mice were infected transurethrally with Escherichia coli. Four hours post infection, CIP oral doses of 3, 10, 30,100, and 300 mg/kg, were administered as single doses (for PK and dose response) and repeated doses (PD and PK/PD). Bacterial burden in kidneys, bladder, urine, body temperature, and other clinical signs were assessed twenty-four hours post-treatment.
Results: CIP displayed linear PK with dose proportional increase in Cmax and AUCinf in plasma. In PD time course studies, CIP showed rapid onset, intensity and duration of anti-bacterial effect in target tissues. In intrinsic PD studies, CIP showed a maximum effect at plasma AUC/MIC=1705 (300 mg/kg, twice daily) for bacterial load in bladder (r2=0.979), kidney (r2=0.951) and rectal temperature (r2=0.67). A plasma AUC/MIC ratio of 412 was associated with maximum PD effect of Imax=3.7 Log10CFU/bladder and Imax=1.97 Log10CFU/kidney. In dose fractionation studies, plasma AUC/MIC ratio showed highest correlation with efficacy in bladder (r2=0.77) and kidney (r2=0.80) followed by Cmax/MIC ratio in bladder (r2=0.68).
Conclusion: Plasma AUC/MIC showed the highest correlation with the efficacy of Ciprofloxacin on E. coli in diabetic mice with cUTI.
Keywords: Pharmacokinetics, pharmacodynamics, bacterial burden, ciprofloxacin, cUTI, mouse, diabetes.
Graphical Abstract
[http://dx.doi.org/10.1086/516284] [PMID: 9455502]
[http://dx.doi.org/10.1001/jama.279.2.125] [PMID: 9440662]
[http://dx.doi.org/10.1086/510079] [PMID: 17143821]
[http://dx.doi.org/10.1016/S0924-8579(02)00022-5] [PMID: 11978497]
[http://dx.doi.org/10.1016/j.bmc.2016.11.008] [PMID: 27887963]
[http://dx.doi.org/10.1038/nrmicro862] [PMID: 15031728]
[http://dx.doi.org/10.1128/AAC.37.5.1073] [PMID: 8517694]
[PMID: 29581117]
[http://dx.doi.org/10.1016/S0924-8579(02)00105-X] [PMID: 12135846]
[http://dx.doi.org/10.1128/AAC.01329-17] [PMID: 28848015]
[http://dx.doi.org/10.1016/j.urology.2007.09.002] [PMID: 18242357]
[http://dx.doi.org/10.1186/s12879-015-1054-1] [PMID: 26243291]
[http://dx.doi.org/10.1016/j.mib.2017.10.028] [PMID: 29154024]
[http://dx.doi.org/10.1093/infdis/jix211] [PMID: 28475768]
[http://dx.doi.org/10.1016/j.coph.2017.09.004] [PMID: 28964956]
[http://dx.doi.org/10.1128/IAI.00255-08] [PMID: 18644886]
[http://dx.doi.org/10.2165/00003495-199958002-00006] [PMID: 10553702]
[http://dx.doi.org/10.1038/nmeth.1455] [PMID: 20453868]
[http://dx.doi.org/10.1128/AAC.47.7.2118-2124.2003] [PMID: 12821456]
[http://dx.doi.org/10.1124/jpet.109.157172] [PMID: 19779129]
[http://dx.doi.org/10.1128/AAC.44.1.156-163.2000] [PMID: 10602738]
[http://dx.doi.org/10.1128/AAC.00414-06] [PMID: 17145798]
[http://dx.doi.org/10.1124/mol.107.042853] [PMID: 18381565]
[http://dx.doi.org/10.1345/aph.1C199] [PMID: 12921513]