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2018 ; 13
(3
): 280-287
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Co-administration of Antimicrobial Peptides Enhances Toll-like Receptor?4
Antagonist Activity of a Synthetic Glycolipid
#MMPMID29265636
Facchini FA
; Coelho H
; Sestito SE
; Delgado S
; Minotti A
; Andreu D
; Jiménez-Barbero J
; Peri F
ChemMedChem
2018[Feb]; 13
(3
): 280-287
PMID29265636
show ga
This study examines the effect of co-administration of antimicrobial peptides and
the synthetic glycolipid FP7, which is active in inhibiting inflammatory cytokine
production caused by TLR4 activation and signaling. The co-administration of two
lipopolysaccharide (LPS)-neutralizing peptides (a cecropin?A-melittin hybrid
peptide and a human cathelicidin) enhances by an order of magnitude the potency
of FP7 in blocking the TLR4 signal. Interestingly, this is not an additional
effect of LPS neutralization by peptides, because it also occurs if cells are
stimulated by the plant lectin phytohemagglutinin, a non-LPS TLR4 agonist. Our
data suggest a dual mechanism of action for the peptides, not exclusively based
on LPS binding and neutralization, but also on a direct effect on the LPS-binding
proteins of the TLR4 receptor complex. NMR experiments in solution show that
peptide addition changes the aggregation state of FP7, promoting the formation of
larger micelles. These results suggest a relationship between the aggregation
state of lipid?A-like ligands and the type and intensity of the TLR4 response.