Imperial College London
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DrAndrewEdwards

Faculty of Medicine, Department of Infectious Disease

Director of Postgraduate Education & Senior Lecturer
 
 
 
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Contact

 

a.edwards Website

 
 
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Location

 

5.40AFlowers buildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pee:2019:10.1128/AAC.02105-18,
author = {Pee, CJE and Pader, V and Ledger, EVK and Edwards, AM},
doi = {10.1128/AAC.02105-18},
journal = {Antimicrobial Agents and Chemotherapy},
pages = {1--18},
title = {A FASII inhibitor prevents staphylococcal evasion of daptomycin by inhibiting phospholipid decoy production},
url = {http://dx.doi.org/10.1128/AAC.02105-18},
volume = {63},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Daptomycin is a treatment of last resort for serious infections caused by drug-resistant Gram-positive pathogens such as methicillin-resistant Staphylococcus aureus. We have shown recently that S. aureus can evade daptomycin by releasing phospholipid decoys that sequester and inactivate the antibiotic, leading to treatment failure. Since phospholipid release occurs via an active process, we hypothesised that it could be inhibited, thereby increasing daptomycin efficacy. To identify opportunities for therapeutic interventions that block phospholipid release, we first determined how the host environment influenced the release of phospholipids and inactivation of daptomycin by S. aureus The addition of certain host-associated fatty acids to the growth medium enhanced phospholipid release. However, in serum, the sequestration of fatty acids by albumin restricted their availability to S. aureus sufficiently to prevent their use in the generation of released phospholipids. This finding implied that in host tissues S. aureus may be completely dependent upon endogenous phospholipid biosynthesis to generate lipids for release, providing a target for therapeutic intervention. To test this, we exposed S. aureus to AFN-1252, an inhibitor of the staphylococcal FASII fatty acid biosynthetic pathway, together with daptomycin. AFN-1252 efficiently blocked daptomycin-induced phospholipid decoy production, even in the case of isolates resistant to AFN-1252, which prevented the inactivation of daptomycin and resulted in sustained bacterial killing. In turn, daptomycin prevented the fatty acid-dependent emergence of AFN-1252-resistant isolates in vitro In summary, AFN-1252 significantly enhances daptomycin activity against S. aureusin vitro by blocking the production of phospholipid decoys, whilst daptomycin blocks the emergence of resistance to AFN-1252.
AU  - Pee,CJE
AU  - Pader,V
AU  - Ledger,EVK
AU  - Edwards,AM
DO  - 10.1128/AAC.02105-18
EP  - 18
PY  - 2019///
SN  - 0066-4804
SP  - 1
TI  - A FASII inhibitor prevents staphylococcal evasion of daptomycin by inhibiting phospholipid decoy production
T2  - Antimicrobial Agents and Chemotherapy
UR  - http://dx.doi.org/10.1128/AAC.02105-18
UR  - https://www.ncbi.nlm.nih.gov/pubmed/30718253
UR  - https://aac.asm.org/content/63/4/e02105-18/article-info
UR  - http://hdl.handle.net/10044/1/67253
VL  - 63
ER  -
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