Abstract:
:The cationic glycolipid IAXO-102, a potent TLR4 antagonist targeting both MD-2 and CD14 co-receptors, has been used as scaffold to design new potential TLR4 modulators and fluorescent labels for the TLR4 receptor complex (membrane TLR4.MD-2 dimer and CD14). The primary amino group of IAXO-102, not involved in direct interaction with MD-2 and CD14 receptors, has been exploited to covalently attach a fluorescein (molecules 1 and 2) or to link two molecules of IAXO-102 through diamine and diammonium spacers, obtaining 'dimeric' molecules 3 and 4. The structure-based rational design of compounds 1-4 was guided by the optimization of MD-2 and CD14 binding. Compounds 1 and 2 inhibited TLR4 activation, in a concentration-dependent manner, and signaling in HEK-Blue TLR4 cells. The fluorescent labeling of murine macrophages by molecule 1 was inhibited by LPS and was also abrogated when cell surface proteins were digested by trypsin, thus suggesting an interaction of fluorescent probe 1 with membrane proteins of the TLR4 receptor system.
journal_name
Chem Biol Drug Desjournal_title
Chemical biology & drug designauthors
Ciaramelli C,Calabrese V,Sestito SE,Pérez-Regidor L,Klett J,Oblak A,Jerala R,Piazza M,Martín-Santamaría S,Peri Fdoi
10.1111/cbdd.12749subject
Has Abstractpub_date
2016-08-01 00:00:00pages
217-29issue
2eissn
1747-0277issn
1747-0285journal_volume
88pub_type
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