Fluorescence

Publication Title: 
Biochemical and Biophysical Research Communications

Cellular senescence is a tumor suppression mechanism. We previously reported that CKII downregulation induces senescence in human lung fibroblast IMR-90 and colon cancer HCT116 cells. In this study, potential longevity drugs, including rapamycin, vitamin C, and vitamin E, blocked CKII downregulation-mediated senescence through reduction of reactive oxygen species (ROS) production in HCT116 cells.

Author(s): 
Park, Ji Hye
Kim, Jin Joo
Bae, Young-Seuk
Publication Title: 
Schizophrenia Research

In the cerebral prefrontal cortex (PFC), DNA-methyltransferase 1 (DNMT1), the enzyme that catalyzes the methylation of cytosine at carbon atoms in position 5 in CpG dinucleotides, is expressed selectively in GABAergic neurons and is upregulated in layers I and II of schizophrenia (SZ) and bipolar disorder patients with psychosis (BDP).

Author(s): 
Veldic, Marin
Kadriu, Bashkim
Maloku, Ekrem
Agis-Balboa, Roberto C.
Guidotti, Alessandro
Davis, John M.
Costa, Erminio
Publication Title: 
Biological & Pharmaceutical Bulletin

Artemisinin exerts the antimalarial activity through activation by heme. The hemolysis in malaria results in the elevated levels of plasma heme which may affect the activity of artemisinin. We hypothesized that the extracellular heme would potentiate the antimalarial activity of artemisinin. Hemin (ferric heme) at the pathologic concentrations enhanced the activity of artemisinin against Plasmodium falciparum in vitro and increased the levels of the lipid peroxidation products in the presence of artemisinin.

Author(s): 
Tangnitipong, Sunanta
Thaptimthong, Thitiporn
Srihirun, Sirada
Unchern, Supeenun
Kittikool, Dusadee
Udomsangpetch, Rachanee
Sibmooh, Nathawut
Publication Title: 
PloS One

Artemisinin, a secondary metabolite produced in Artemisia plant species, besides having antimalarial properties is also phytotoxic. Although, the phytotoxic activity of the compound has been long recognized, no information is available on the mechanism of action of the compound on photosynthetic activity of the plant. In this report, we have evaluated the effect of artemisinin on photoelectron transport activity of chloroplast thylakoid membrane.

Author(s): 
Bharati, Adyasha
Kar, Monaranjan
Sabat, Surendra Chandra
Publication Title: 
The American Journal of Tropical Medicine and Hygiene

There is an urgent need for accurate and inexpensive handheld instruments for the evaluation of medicine quality in the field. A blinded evaluation of the diagnostic accuracy of the Counterfeit Detection Device 3 (CD-3), developed by the US Food and Drug Administration Forensic Chemistry Center, was conducted in the Lao People's Democratic Republic. Two hundred three samples of the oral antimalarial artesunate were compared with authentic products using the CD-3 by a trainer and two trainees.

Author(s): 
Ranieri, Nicola
Tabernero, Patricia
Green, Michael D.
Verbois, Leigh
Herrington, James
Sampson, Eric
Satzger, R. Duane
Phonlavong, Chindaphone
Thao, Khamxay
Newton, Paul N.
Witkowski, Mark R.
Publication Title: 
Cancer Letters

The cytotoxic effects of aqueous extract of Triphala, an ayurvedic formulation, were investigated on human breast cancer cell line (MCF-7) and a transplantable mouse thymic lymphoma (barcl-95). The viability of treated cells was found to decrease with the increasing concentrations of Triphala. On the other hand, treatment of normal breast epithelial cells, MCF-10 F, human peripheral blood mononuclear cells, mouse liver and spleen cells, with similar concentrations of Triphala did not affect their cytotoxicity significantly.

Author(s): 
Sandhya, T.
Lathika, K. M.
Pandey, B. N.
Mishra, K. P.
Publication Title: 
Phytotherapy research: PTR

The ability of an aqueous extract of W. somnifera L. Dunal (Family: Solanaceae) roots to inhibit fibril formation by the amyloid-β peptide in vitro was investigated. W. somnifera is used extensively in traditional Ayurvedic medicine as a nerve tonic with reputed memory enhancing properties. Inhibition of fibrillogenesis measured by transmission electron microscopy and ThT fluorescence assay showed that an aqueous extract of W. somnifera strongly inhibited Aβ fibril formation in a concentration-dependent manner, when compared with control samples.

Author(s): 
Kumar, Suresh
Harris, Robin J.
Seal, Christopher J.
Okello, Edward J.
Publication Title: 
The Journal of Investigative Dermatology

The oxygen status of skin is a controversial topic. Skin is radiosensitive, suggesting it is well-oxygenated. However, it can be further sensitized with nitroimidazole drugs, implying that it is partially hypoxic. Skin oxygen levels are difficult to measure with either electrodes or the hypoxia-monitoring agent (3)H-misonidazole. For the latter, binding has previously been reported to be high in murine skin, but this could be attributed to either non-oxygen-dependent variations in nitroreductase activity, drug metabolism, and/or actual oxygen gradients.

Author(s): 
Evans, Sydney M.
Schrlau, Amy E.
Chalian, Ara A.
Zhang, Paul
Koch, Cameron J.
Publication Title: 
Molecular Vision

PURPOSE: To determine comparative effects of ultraviolet (UV)-A irradiation on structural and functional properties of wild type (WT) alphaB-crystallin and its three deamidated mutant proteins (alphaB-Asn78Asp, alphaB-Asn146Asp, and alphaB-Asn78/146Asp). METHODS: Three deamidated mutants previously generated from recombinant WT alphaB-crystallin, using a site-specific mutagenesis procedure as previously described [32], were used. The WT alphaB-crystallin and its three deamidated species were exposed to UV-A light (320-400 nm) at intensities of 20 or 50 J/cm(2).

Author(s): 
Mafia, Kerri
Gupta, Ratna
Kirk, Marion
Wilson, L.
Srivastava, O. P.
Barnes, Stephen
Publication Title: 
Chemical Communications (Cambridge, England)

A chelator and a pro-chelator that can be activated by H(2)O(2) and subsequently sequesters iron and attenuates the Fenton reaction have been developed; both molecules are fluorescent excitable by visible light, and H(2)O(2)-activation, as well as iron-chelation, induces remarkable changes in fluorescence.

Author(s): 
Wei, Yibin
Guo, Maolin

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