56 research outputs found
Tunable tribological properties in water-based lubrication of water-soluble fullerene derivatives via varying terminal groups
Tunable tribological properties in water-based lubrication of water-soluble fullerene derivatives via varying terminal groups
Genetic Variants in WNT2B and BTRC Predict Melanoma Survival
Cutaneous melanoma (CM) is the most lethal skin cancer. The Wnt pathway has an impact on development, invasion and metastasis of CM, thus likely affecting CM prognosis. Using data from a published genome-wide association study (GWAS) from The University of Texas M.D. Anderson Cancer Center, we assessed the associations of 19,830 common single-nucleotide polymorphisms (SNPs) in 151 Wnt pathway autosomal genes with CM-specific survival (CMSS) and then validated significant SNPs in another GWAS from Harvard University. In the single-locus analysis, 1,855 SNPs were significantly associated with CMSS at P T and BTRC rs61873997 G>A) that showed a predictive role in CMSS, with an effect-allele-attributed hazards ratio [adjHR of 1.99 (95% confidence interval (CI) = 1.41-2.81, P = 8.10E-05) and 0.61 (0.46-0.80, 3.12E-04), respectively]. Collectively, these variants in the Wnt pathway genes may be biomarkers for outcomes of CM patients, if validated by larger studies
Identification of the Most Stable Sc2C80 Isomers: Structure, Electronic Property, and Molecular Spectra Investigations
A systematic density functional theory investigation has been carried out to explore the possible structures of Sc2C80 at the BMK/6-31G(d) level. The results clearly show that Sc2@C80-Ih, Sc2@C80-D5h, and Sc2C2@C78-C2v can be identified as three isomers of Sc2C80 metallofullerene with the lowest energy. Frontier molecular orbital analysis indicates that the two Sc2@C80 isomers have a charge state as (Sc3+)2@C806-and the Sc2C2@C78 has a charge state of (Sc3+)2C22-@C784-. Moreover, the metal-cage covalent interactions have been studied to reveal the dynamics of endohedral moiety. The vertical electron affinity, vertical ionization potential, infrared spectra and 13C nuclear magnetic resonance spectra have been also computed to further disclose the molecular structures and properties.National Natural Science Foundation of China (NSFC) [20821003, 91027108, 20702053, 20973137]; NSAF [11076027]; Chinese Academy of Sciences; China Postdoctoral Science Foundation [20100480027]; K. C. Wong Education Foundation, Hong Kon
Fullerene-Induced Increase of Glycosyl Residue on Living Plant Cell Wall
In this work, we have investigated the change of cell wall for the tobacco plant cell (Nicotiana tobacurn L. cv. Bright Yellow) under the repression of water-soluble carboxyfullerenes (C-70(C(COOH)(2))(2-4)). The adsorption of C-70(C(COOH)(2))(2-4) on cell wall led to the disruption of cell wall and membrane, and consequently, cell growth inhibition. Results from atomic force microscopy (AFM) force measurement and confocal imaging revealed an increase of the glycosyl residue on the cell wall of carboxyfullerene-treated cells, with a time- and dose-dependent manner, and accompanied by the elevated reactive oxygen species (ROS). Moreover, the stimulation-sensitive alteration of glycosyl residue and ROS was demonstrated, which suggested a possible protection strategy for the plant cells under fullerene repression. This study provides the first direct evidence on the change of plant cell wall composition under the repression of fullerene and is the first successful application of AFM ligand-receptor binding force measurement to the living plant cell. The new information present here would help to a better understanding and assessment of the biological effect of fullerenes on plant
Protective Effect of C<sub>70</sub>-Carboxyfullerene against Oxidative-Induced Stress on Postmitotic Muscle Cells
Satellite
muscle cells play an important role in regeneration of skeletal muscle.
However, they are particularly vulnerable to oxidative stress. Herein,
we address our efforts on the cytoprotective activities of carboxyfullerenes
with different cage size (C<sub>60</sub> vs C<sub>70</sub>) and adduct
number on postmitotic muscle cell (C2C12 cell). The correlation of
the structural effect on the cytoprotective capability of carboxyfullerenes
was evaluated. We find that quadri-malonic acid C<sub>70</sub> fullerene
(QF<sub>70</sub>) exhibits higher capability on protecting cells from
oxidative-induced stress among these tested carboxyfullerenes. The
accumulation of intracellular superoxide dismutase (SOD) is proposed
to play an important role in their diverse antioxidative ability.
Moreover, the pretreatment of QF<sub>70</sub> could also obviously
enhance the viability of myotubes originated from oxidative-stressed
C2C12 cells, which facilitates the future application of carboxyfullerenes
in tissue engineering and nanomedicine
Fullerene-Induced Increase of Glycosyl Residue on Living Plant Cell Wall
In
this work, we have investigated the change of cell wall for
the tobacco plant cell (<i>Nicotiana tobacum</i> L. cv.
Bright Yellow) under the repression of water-soluble carboxyfullerenes
(C<sub>70</sub>(C(COOH)<sub>2</sub>)<sub>2–4</sub>). The adsorption
of C<sub>70</sub>(C(COOH)<sub>2</sub>)<sub>2–4</sub> on cell
wall led to the disruption of cell wall and membrane, and consequently,
cell growth inhibition. Results from atomic force microscopy (AFM)
force measurement and confocal imaging revealed an increase of the
glycosyl residue on the cell wall of carboxyfullerene-treated cells,
with a time- and dose-dependent manner, and accompanied by the elevated
reactive oxygen species (ROS). Moreover, the stimulation-sensitive
alteration of glycosyl residue and ROS was demonstrated, which suggested
a possible protection strategy for the plant cells under fullerene
repression. This study provides the first direct evidence on the change
of plant cell wall composition under the repression of fullerene and
is the first successful application of AFM ligand-receptor binding
force measurement to the living plant cell. The new information present
here would help to a better understanding and assessment of the biological
effect of fullerenes on plant
Gd@C<sub>82</sub>-(ethylenediamine)<sub>8</sub> Nanoparticle: A New High-Efficiency Water-Soluble ROS Scavenger
It is important to maintain a reactive
oxygen species (ROS) balance
in organisms; thus, a valid ROS scavenger with good biocompatibility
is urgently required. To prepare a high-efficiency ROS scavenger,
multiple ethylenediamine (EDA) groups are bonded for the first time
to a metallofullerene Gd@C<sub>82</sub> to obtain water-soluble Gd@C<sub>82</sub>-(EDA)<sub>8</sub> nanoparticles (NPs) through a facile solid–liquid
reaction. Gd@C<sub>82</sub>-(EDA)<sub>8</sub> NPs with a relatively
better conjugation possess an excellent capability to scavenge hydroxyl
radicals. Moreover, Gd@C<sub>82</sub>-(EDA)<sub>8</sub> NPs exhibited
a remarkable cytoprotective effect against H<sub>2</sub>O<sub>2</sub>-induced injuries to human epidermal keratinocytes-adult (HEK-a)
cells at a low concentration of 2.5 μM. In contrast, Gd@C<sub>82</sub>-(OH)<sub>26</sub> NPs that modified with hydroxyls show
an apparent protective effect at a much higher concentration of 40
μM. This outstanding cytoprotective performance of Gd@C<sub>82</sub>-(EDA)<sub>8</sub> NPs is mainly attributed to their extremely
high cellular uptake and comparably strong conjugation. Gd@C<sub>82</sub>-(EDA)<sub>8</sub> NPs with good biocompatibility exhibit excellent
ROS scavenging capability even at a significantly low concentration,
which promotes its versatile applications in cosmetics and biomedicine
CCDC 694894: Experimental Crystal Structure Determination
Related Article: Tianming Zuo, M.M.Olmstead, C.M.Beavers, A.L.Balch, Guangbin Wang, G.T.Yee, Chunying Shu, Liaosa Xu, B.Elliott, L.Echegoyen, J.C.Duchamp, H.C.Dorn|2008|Inorg.Chem.|47|5234|doi:10.1021/ic800227x,An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures
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