NorA efflux pump inhibitory activity of coumarins from Mesua ferrea.

Abstract:

:The purpose of this investigation was to study the modulator and efflux pump inhibitor activity of coumarins isolated from Mesua ferrea against clinical strains as well as NorA-over expressed strain of Staphylococcus aureus 1199B. Seven coumarins were tested for modulator activity using ethidium bromide (EtBr) as a substrate. Compounds 1, 4-7 modulated the MIC of EtBr by ≥ 2 fold against wild type clinical strains of S. aureus 1199 and S. aureus 1199B, whereas compounds 4-7 modulated the MIC of EtBr by ≥ 16 fold against MRSA 831. Compounds 1, 4-7 also reduced the MIC of norfloxacin by ≥ 8 fold against S. aureus 1199B, and 4-6 reduced the MIC of norfloxacin by ≥ 8 fold against MRSA 831 at half of their MICs. Inhibition of EtBr efflux by NorA-overproducing S. aureus 1199B and MRSA 831 confirmed the role of compounds 4-6 as NorA efflux pump inhibitors (EPI). Dose-dependent activity at sub-inhibitory concentration (6.25 μg/mL) suggested that compounds 4 and 5 are promising EPI compared to verapamil against 1199B and MRSA 831 strains.

journal_name

Fitoterapia

journal_title

Fitoterapia

authors

Roy SK,Kumari N,Pahwa S,Agrahari UC,Bhutani KK,Jachak SM,Nandanwar H

doi

10.1016/j.fitote.2013.07.015

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

140-50

eissn

0367-326X

issn

1873-6971

pii

S0367-326X(13)00186-X

journal_volume

90

pub_type

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