5 research outputs found
Discovery of New Liver X Receptor Agonists by Pharmacophore Modeling and Shape-Based Virtual Screening
Agonists
of liver X receptors (LXR) α and β are important
regulators of cholesterol metabolism, but agonism of the LXRα
subtype appears to cause hepatic lipogenesis, suggesting LXRβ-selective
activators are attractive new lipid lowering drugs. In this work,
pharmacophore modeling and shape-based virtual screening were combined
to predict new LXRβ-selective ligands. Out of the 10 predicted
compounds, three displayed significant LXR activity. Two activated
both LXR subtypes. The third compound activated LXRβ 1.8-fold
over LXRα
Discovery of Potent Soluble Epoxide Hydrolase (sEH) Inhibitors by Pharmacophore-Based Virtual Screening
There is an increasing
interest in the development of soluble epoxide
hydrolase (sEH) inhibitors, which block the degradation of endogenous
anti-inflammatory epoxyeicosatrienoic acids. Within this study, a
set of pharmacophore models for sEH inhibitors was developed. The
Specs database was virtually screened and a cell-free sEH activity
assay was used for the biological investigation of virtual hits. In
total, out of 48 tested compounds, 19 were sEH inhibitors with IC<sub>50</sub> < 10 μM, representing a prospective true positive
hit rate of 40%. Six of these compounds displayed IC<sub>50</sub> values
in the low nanomolar range. The most potent compound <b>21</b>, a urea derivative, inhibited sEH with an IC<sub>50</sub> = 4.2
nM. The applied approach also enabled the identification of diverse
chemical scaffolds, e.g. the pyrimidinone derivative <b>29</b> (IC<sub>50</sub> = 277 nM). The generated pharmacophore model set
therefore represents a valuable tool for the selection of compounds
for biological testing
Anti-inflammatory Activity of Natural Geranylated Flavonoids: Cyclooxygenase and Lipoxygenase Inhibitory Properties and Proteomic Analysis
Geranyl flavones have been studied
as compounds that potentially can be developed as anti-inflammatory
agents. A series of natural geranylated flavanones was isolated from <i>Paulownia tomentosa</i> fruits, and these compounds were studied
for their anti-inflammatory activity and possible mechanism of action.
Two new compounds were characterized [paulownione C (<b>17</b>) and tomentodiplacone O (<b>20</b>)], and all of the isolated
derivatives were assayed for their ability to inhibit cyclooxygenases
(COX-1 and COX-2) and 5-lipoxygenase (5-LOX). The compounds tested
showed variable degrees of activity, with several of them showing
activity comparable to or greater than the standards used in COX-1,
COX-2, and 5-LOX assays. However, only the compound tomentodiplacone
O (<b>20</b>) showed more selectivity against COX-2 versus COX-1
when compared with ibuprofen. The ability of the test compounds to
interact with the above-mentioned enzymes was supported by docking
studies, which revealed the possible incorporation of selected test
substances into the active sites of these enzymes. Furthermore, one
of the COX/LOX dual inhibitors, diplacone (<b>14</b>) (a major
geranylated flavanone of <i>P. tomentosa</i>), was
studied in vitro to obtain a proteomic overview of its effect on inflammation
in LPS-treated THP-1 macrophages, supporting its previously observed
anti-inflammatory activity and revealing the mechanism of its anti-inflammatory
effect
Anti-inflammatory Activity of Natural Geranylated Flavonoids: Cyclooxygenase and Lipoxygenase Inhibitory Properties and Proteomic Analysis
Geranyl flavones have been studied
as compounds that potentially can be developed as anti-inflammatory
agents. A series of natural geranylated flavanones was isolated from <i>Paulownia tomentosa</i> fruits, and these compounds were studied
for their anti-inflammatory activity and possible mechanism of action.
Two new compounds were characterized [paulownione C (<b>17</b>) and tomentodiplacone O (<b>20</b>)], and all of the isolated
derivatives were assayed for their ability to inhibit cyclooxygenases
(COX-1 and COX-2) and 5-lipoxygenase (5-LOX). The compounds tested
showed variable degrees of activity, with several of them showing
activity comparable to or greater than the standards used in COX-1,
COX-2, and 5-LOX assays. However, only the compound tomentodiplacone
O (<b>20</b>) showed more selectivity against COX-2 versus COX-1
when compared with ibuprofen. The ability of the test compounds to
interact with the above-mentioned enzymes was supported by docking
studies, which revealed the possible incorporation of selected test
substances into the active sites of these enzymes. Furthermore, one
of the COX/LOX dual inhibitors, diplacone (<b>14</b>) (a major
geranylated flavanone of <i>P. tomentosa</i>), was
studied in vitro to obtain a proteomic overview of its effect on inflammation
in LPS-treated THP-1 macrophages, supporting its previously observed
anti-inflammatory activity and revealing the mechanism of its anti-inflammatory
effect
Anti-inflammatory Activity of Natural Geranylated Flavonoids: Cyclooxygenase and Lipoxygenase Inhibitory Properties and Proteomic Analysis
Geranyl flavones have been studied
as compounds that potentially can be developed as anti-inflammatory
agents. A series of natural geranylated flavanones was isolated from <i>Paulownia tomentosa</i> fruits, and these compounds were studied
for their anti-inflammatory activity and possible mechanism of action.
Two new compounds were characterized [paulownione C (<b>17</b>) and tomentodiplacone O (<b>20</b>)], and all of the isolated
derivatives were assayed for their ability to inhibit cyclooxygenases
(COX-1 and COX-2) and 5-lipoxygenase (5-LOX). The compounds tested
showed variable degrees of activity, with several of them showing
activity comparable to or greater than the standards used in COX-1,
COX-2, and 5-LOX assays. However, only the compound tomentodiplacone
O (<b>20</b>) showed more selectivity against COX-2 versus COX-1
when compared with ibuprofen. The ability of the test compounds to
interact with the above-mentioned enzymes was supported by docking
studies, which revealed the possible incorporation of selected test
substances into the active sites of these enzymes. Furthermore, one
of the COX/LOX dual inhibitors, diplacone (<b>14</b>) (a major
geranylated flavanone of <i>P. tomentosa</i>), was
studied in vitro to obtain a proteomic overview of its effect on inflammation
in LPS-treated THP-1 macrophages, supporting its previously observed
anti-inflammatory activity and revealing the mechanism of its anti-inflammatory
effect