7 research outputs found
Discovery of a Series of Thiazole Derivatives as Novel Inhibitors of Metastatic Cancer Cell Migration and Invasion
Effective inhibitors of cancer cell migration and invasion
can
potentially lead to clinical applications as a therapy to block tumor
metastasis, the primary cause of death in cancer patients. To this
end, we have designed and synthesized a series of thiazole derivatives
that showed potent efficacy against cell migration and invasion in
metastatic cancer cells. The most effective compound, <b>5k</b>, was found to have an IC<sub>50</sub> value of 176 nM in the dose-dependent
transwell migration assays in MDA-MB-231cells. At a dose of 10 μM, <b>5k</b> also blocked about 80% of migration in HeLa and A549 cells
and 60% of invasion of MDA-MB-231 cells. Importantly, the majority
of the derivatives exhibited no apparent cytotoxicity in the clonogenic
assays. The low to negligible inhibition of cell proliferation is
a desirable property of these antimigration derivatives because they
hold promise of low toxicity to healthy cells as potential therapeutic
agents. Mechanistic studies analyzing the actin cytoskeleton by microscopy
demonstrate that compound <b>5k</b> substantially reduced cellular
f-actin and prevented localization of fascin to actin-rich membrane
protrusions. These results suggest that the antimigration activity
may result from impaired actin structures in protrusions that are
necessary to drive migration
Structure–Activity Relationship and Pharmacokinetic Studies of 1,5-Diheteroarylpenta-1,4-dien-3-ones: A Class of Promising Curcumin-Based Anticancer Agents
Forty-three
1,5-diheteroaryl-1,4-pentadien-3-ones were designed
as potential curcumin mimics, structurally featuring a central five-carbon
dienone linker and two identical nitrogen-containing aromatic rings.
They were synthesized using a Horner–Wadsworth–Emmons
reaction as the critical step and evaluated for their cytotoxicity
and antiproliferative activities toward both androgen-insensitive
and androgen-sensitive prostate cancer cell lines and an aggressive
cervical cancer cell line. Most of the synthesized compounds showed
distinctly better in vitro potency than curcumin in the four cancer
cell lines. The structure–activity data acquired from the study
validated (1<i>E</i>,4<i>E</i>)-1,5-dihereroaryl-1,4-pentadien-3-ones
as an excellent scaffold for in-depth development for clinical treatment
of prostate and cervical cancers. 1-Alkyl-1<i>H</i>-imidazol-2-yl,
ortho pyridyl, 1-alkyl-1<i>H</i>-benzoÂ[<i>d</i>]Âimidazole-2-yl, 4-bromo-1-methyl-1<i>H</i>-pyrazol-3-yl,
thiazol-2-yl, and 2-methyl-4-(trifluoromethyl)Âthiazol-5-yl were identified
as optimal heteroaromatic rings for the promising in vitro potency.
(1<i>E</i>,4<i>E</i>)-1,5-BisÂ(2-methyl-4-(trifluoromethyl)Âthiazol-5-yl)Âpenta-1,4-dien-3-one,
featuring thiazole rings and trifluoromethyl groups, was established
as the optimal lead compound because of its good in vitro potency
and attractive in vivo pharmacokinetic profiles
Design, Synthesis, and Osteogenic Activity of Daidzein Analogs on Human Mesenchymal Stem Cells
Osteoporosis
is caused by an overstimulation of osteoclast activity
and the destruction of the bone extracellular matrix. Without the
normal architecture, osteoblast cells are unable to rebuild phenotypically
normal bone. Hormone replacement therapy with estrogen has been effective
in increasing osteoblast activity but also has resulted in the increased
incidence of breast and uterine cancer. In this study we designed
and synthesized a series of daidzein analogs to investigate their
osteogenic induction potentials. Human bone marrow derived mesenchymal
stem cells (MSCs) from three different donors were treated with daidzein
analogs and demonstrated enhanced osteogenesis when compared to daidzein
treatment. The enhanced osteogenic potential of these daidzein analogs
resulted in increased osterix (Sp7), alkaline phosphatase (ALP), osteopontin
(OPN), and insulin-like growth factor 1 (IGF-1), which are osteogenic
transcription factors that regulate the maturation of osteogenic progenitor
cells into mature osteoblast cells
Rational Design of a Boron-Modified Triphenylethylene (GLL398) as an Oral Selective Estrogen Receptor Downregulator
Development
of orally bioavailable nonsteroidal selective estrogen
receptor downregulators (SERDs) provides clinical opportunities for
the long-term treatment and adjuvant therapy of breast cancer at all
stages. We describe the design, synthesis, and identification of a
boron-modified GW7604 derivative (GLL398, <b>9</b>), a SERD
candidate, in which a boronic acid functional group replaces the phenolic
hydroxyl group of GW7604. Compound <b>9</b> strongly binds to
ERα in a fluorescence resonance energy transfer binding assay
(IC<sub>50</sub> = 1.14 nM) and potently degrades ERα in MCF-7
breast cancer cells (IC<sub>50</sub> = 0.21 μM). Most importantly,
the introduction of the boronic acid group confers superior oral bioavailability
of <b>9</b> (AUC = 36.9 μg·h/mL) in rats as compared
to GW7604 (AUC = 3.35 μg·h/mL). The strikingly favorable
pharmacokinetic property of <b>9</b> makes it a promising oral
SERD suitable for clinical evaluation
Fulvestrant‑3 Boronic Acid (ZB716): An Orally Bioavailable Selective Estrogen Receptor Downregulator (SERD)
Orally bioavailable SERDs may offer
greater systemic drug exposure,
improved clinical efficacy, and more durable treatment outcome for
patients with ER-positive endocrine-resistant breast cancer. We report
the design and synthesis of a boronic acid modified fulvestrant (<b>5</b>, ZB716), which binds to ERα competitively (IC<sub>50</sub> = 4.1 nM) and effectively downregulates ERα in both
tamoxifen-sensitive and tamoxifen-resistant breast cancer cells. Furthermore,
It has superior oral bioavailability (AUC = 2547.1 ng·h/mL) in
mice, indicating its promising clinical utility as an oral SERD
A Ligand-Based Drug Design. Discovery of 4‑Trifluoromethyl-7,8-pyranocoumarin as a Selective Inhibitor of Human Cytochrome P450 1A2
In
humans, cytochrome P450 1A2 is the major enzyme metabolizing
environmental arylamines or heterocyclic amines into carcinogens.
Since evidence shows that planar triangle-shaped molecules are capable
of selectively inhibiting P450 1A2, 16 triangular flavone, and coumarin
derivatives were designed and synthesized for these studies. Among
these compounds, 7,8-furanoflavone time-dependently inhibits P450
1A2 with a <i>K</i><sub>I</sub> value of 0.44 μM.
With a 5 min preincubation in the presence of NADPH, 0.01 μM
7,8-furanoflavone completely inactivates P450 1A2 but does not influence
the activities of P450s 1A1 and 1B1. Another target compound, 7,8-pyrano-4-trifluoromethylcoumarin,
is found to be a competitive inhibitor, showing high selectivity for
the inhibition of P450 1A2 with a <i>K</i><sub>i</sub> of
0.39 μM, 155- and 52-fold lower than its <i>K</i><sub>i</sub> values against P450s 1A1 and 1B1, respectively. In yeast
AhR activation assays, 7,8-pyrano-4-trifluoromethylÂcoumarin
does not activate aryl hydrocarbon receptor when the concentration
is lower than 1 μM, suggesting that this compound would not
up-regulate AhR-caused P450 enzyme expression. In-cell P450 1A2 inhibition
assays show that 7,8-pyrano-4-trifluoromethylÂcoumarin decreases
the MROD activity in HepG2 cells at concentrations higher than 1 μM.
Thus, using 7,8-pyrano-4-trifluoromethylÂcoumarin, a selective
and specific P450 1A2 action suppression could be achieved, indicating
the potential for the development of P450 1A2-targeting cancer preventive
agents
A Ligand-Based Drug Design. Discovery of 4‑Trifluoromethyl-7,8-pyranocoumarin as a Selective Inhibitor of Human Cytochrome P450 1A2
In
humans, cytochrome P450 1A2 is the major enzyme metabolizing
environmental arylamines or heterocyclic amines into carcinogens.
Since evidence shows that planar triangle-shaped molecules are capable
of selectively inhibiting P450 1A2, 16 triangular flavone, and coumarin
derivatives were designed and synthesized for these studies. Among
these compounds, 7,8-furanoflavone time-dependently inhibits P450
1A2 with a <i>K</i><sub>I</sub> value of 0.44 μM.
With a 5 min preincubation in the presence of NADPH, 0.01 μM
7,8-furanoflavone completely inactivates P450 1A2 but does not influence
the activities of P450s 1A1 and 1B1. Another target compound, 7,8-pyrano-4-trifluoromethylcoumarin,
is found to be a competitive inhibitor, showing high selectivity for
the inhibition of P450 1A2 with a <i>K</i><sub>i</sub> of
0.39 μM, 155- and 52-fold lower than its <i>K</i><sub>i</sub> values against P450s 1A1 and 1B1, respectively. In yeast
AhR activation assays, 7,8-pyrano-4-trifluoromethylÂcoumarin
does not activate aryl hydrocarbon receptor when the concentration
is lower than 1 μM, suggesting that this compound would not
up-regulate AhR-caused P450 enzyme expression. In-cell P450 1A2 inhibition
assays show that 7,8-pyrano-4-trifluoromethylÂcoumarin decreases
the MROD activity in HepG2 cells at concentrations higher than 1 μM.
Thus, using 7,8-pyrano-4-trifluoromethylÂcoumarin, a selective
and specific P450 1A2 action suppression could be achieved, indicating
the potential for the development of P450 1A2-targeting cancer preventive
agents