Document Detail

Safety pharmacology of DW-224a, a novel fluoroquinolone antibiotic agent.
MedLine Citation:
PMID:  15573468     Owner:  NLM     Status:  MEDLINE    
To investigate the safety pharmacology of a novel fluoroquinolone antibiotic agent, DW-224a, on the vital functions, we studied its effects on the central nervous system, cardiovascular system and respiratory system. To determine the effects on the central nervous system, we used a modified Irwin's test at each time point after oral administration of DW-224a to mice. In this test, we found that the treatment of test article had no effects on motor activity, behavioral changes, coordination, and sensory/motor reflex responses. The effects of DW-224a on the cardiovascular system were evaluated by the use of a telemetry system in beagle dogs. At 360 min post-DW-224a (100 mg/kg) administration, QT interval prolongation was observed. However, there were no changes in heart rate, blood pressure, and electrocardiogram at all doses and each time points with the exception of QT-interval prolongation as compared to the vehicle treated group. In experiments designed to determine the changes of respiratory function in rats, we found no changes at all doses and time points. We investigated the effects of DW-224a on the human ether-a-go-go-related gene (hERG) mediated potassium currents to evaluate its potential to induce QT interval prolongation. When whole cell patch-clamp electrophysiology was used, DW-224a inhibited hERG currents with IC50 of 218.12 +/- 39.51 microM though its effect was less potent than that of E-4031, a positive control drug. Our data suggested that DW-224a showed no adverse effects on the central nervous system, cardiovascular system, and respiratory system, with the exception of the effect on the QT interval prolongation.
Eun-Joo Kim; Won-Ho Shin; Ki-Suk Kim; Sang-Seop Han
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Drug and chemical toxicology     Volume:  27     ISSN:  0148-0545     ISO Abbreviation:  Drug Chem Toxicol     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-12-02     Completed Date:  2005-03-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7801723     Medline TA:  Drug Chem Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  295-307     Citation Subset:  IM    
Department of Pharmacology and National Research Laboratory, Korea Institute of Toxicology, Korea Research Institute of Chemical Technology, Yuseong, Daejeon, South Korea.
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MeSH Terms
Anti-Bacterial Agents / toxicity*
Behavior, Animal / drug effects
Blood Pressure / drug effects
CHO Cells
Ether-A-Go-Go Potassium Channels
Fluoroquinolones / toxicity*
Heart Rate / drug effects
Mice, Inbred ICR
Potassium Channels, Voltage-Gated / antagonists & inhibitors
Rats, Sprague-Dawley
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/DW-224a; 0/ERG1 potassium channel; 0/Ether-A-Go-Go Potassium Channels; 0/Fluoroquinolones; 0/Potassium Channels, Voltage-Gated

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