In vitro efficacy of diclofenac against Listeria monocytogenes.
Chemotherapy is often futile in systemic listeriosis, translating to being a peril to public health. There is, thus, an imperative need for novel antilisterial compounds, possibly acting through mechanisms dissimilar to those of existing drugs. The present study describes one such agent-the non-steroidal anti-inflammatory drug (NSAID) diclofenac sodium (Dc). The National Committee for Clinical Laboratory Standards (NCCLS) minimum inhibitory concentration (MIC), mode of action, and two mechanisms of action, i.e., on bacterial DNA and membrane, have been characterized with respect to Dc. The drug showed noteworthy inhibitory action (MIC90 = 50 microg/ml) against Listeria strains, demonstrated cidal (minimum bactericidal concentration [MBC]=100 microg/ml) activity, inhibited listerial DNA synthesis (45.48%; incorporation of [methyl-3H] thymidine), and possessed bacterial membrane-damaging activity (37.33%; BacLight assay). Dc could be used as a lead compound for the synthesis of new, more active agents perhaps devoid of side effects. Further, quantitative structure-activity relationship (QSAR) studies will contribute to a new generation of promising adjuvants to existing antilisterial drugs.
Dutta
N K
NK
Institute of Laboratory Animal Resources, Laboratory Animal Medicine, College of Veterinary Medicine and KRF Zoonotic Disease Priority Research Institute, Seoul National University, San 56-1, Sillim 9 Dong, Gwanak-gu, Seoul, South Korea.
Mazumdar
K
K
Baek
M W
MW
Kim
D J
DJ
Na
Y R
YR
Park
S H
SH
Lee
H K
HK
Lee
B H
BH
Park
J H
JH
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004008:Diclofenac / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D008089:Listeria monocytogenes / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D013997:Time Factors
D000900:Anti-Bacterial Agents; D004008:Diclofenac