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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2017 ; 12
(6
): e0179174
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The anti-inflammatory and immunomodulatory potential of braylin: Pharmacological
properties and mechanisms by in silico, in vitro and in vivo approaches
#MMPMID28594906
Espírito-Santo RF
; Meira CS
; Costa RDS
; Souza Filho OP
; Evangelista AF
; Trossini GHG
; Ferreira GM
; Velozo EDS
; Villarreal CF
; Pereira Soares MB
PLoS One
2017[]; 12
(6
): e0179174
PMID28594906
show ga
Braylin belongs to the group of natural coumarins, a group of compounds with a
wide range of pharmacological properties. Here we characterized the
pharmacological properties of braylin in vitro, in silico and in vivo in models
of inflammatory/immune responses. In in vitro assays, braylin exhibited
concentration-dependent suppressive activity on activated macrophages. Braylin
(10-40 ?M) reduced the production of nitrite, IL-1?, TNF-? and IL-6 by J774 cells
or peritoneal exudate macrophages stimulated with LPS and IFN-?. Molecular
docking calculations suggested that braylin present an interaction pose to act as
a glucocorticoid receptor ligand. Corroborating this idea, the inhibitory effect
of braylin on macrophages was prevented by RU486, a glucocorticoid receptor
antagonist. Furthermore, treatment with braylin strongly reduced the
NF-?B-dependent transcriptional activity on RAW 264.7 cells. Using the complete
Freund's adjuvant (CFA)-induced paw inflammation model in mice, the
pharmacological properties of braylin were demonstrated in vivo. Braylin
(12.5-100 mg/kg) produced dose-related antinociceptive and antiedematogenic
effects on CFA model. Braylin did not produce antinociception on the tail flick
and hot plate tests in mice, suggesting that braylin-induced antinociception is
not a centrally-mediated action. Braylin exhibited immunomodulatory properties on
the CFA model, inhibiting the production of pro-inflammatory cytokines IL-1?,
TNF-? and IL-6, while increased the anti-inflammatory cytokine TGF-?. Our results
show, for the first time, anti-inflammatory, antinociceptive and immunomodulatory
effects of braylin, which possibly act through the glucocorticoid receptor
activation and by inhibition of the transcriptional activity of NF-?B. Because
braylin is a phosphodiesterase-4 inhibitor, this coumarin could represent an
ideal prototype of glucocorticoid receptor ligand, able to induce synergic
immunomodulatory effects.