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111.
Histone deacetylases (HDAC) are metal-dependent enzymes and considered as important targets for cell functioning. Particularly, higher expression of class I HDACs is common in the onset of multiple malignancies which results in deregulation of many target genes involved in cell growth, differentiation and survival. Although substantial attempts have been made to control the irregular functioning of HDACs by employing various inhibitors with high sensitivity towards transformed cells, limited success has been achieved in epigenetic cancer therapy. Here in this study, we used ligand-based pharmacophore and 2-dimensional quantitative structure activity relationship (QSAR) modeling approaches for targeting class I HDAC isoforms. Pharmacophore models were generated by taking into account the known IC50 values and experimental energy scores with extensive validations. The QSAR model having an external R2 value of 0.93 was employed for virtual screening of compound libraries. 10 potential lead compounds (C1-C10) were short-listed having strong binding affinities for HDACs, out of which 2 compounds (C8 and C9) were able to interact with all members of class I HDACs. The potential binding modes of HDAC2 and HDAC8 to C8 were explored through molecular dynamics simulations. Overall, bioactivity and ligand efficiency (binding energy/non-hydrogen atoms) profiles suggested that proposed hits may be more effective inhibitors for cancer therapy. 相似文献
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Ahsan F. Bairam Zainab W. Kermasha Ming-Cheh Liu Katsuhisa Kurogi Kohji Yamamoto 《Archives of insect biochemistry and physiology》2020,104(3):e21671
Sulfoconjugation plays a vital role in the detoxification of xenobiotics and in the metabolism of endogenous compounds. In this study, we aimed to identify new members of the sulfotransferase (SULT) superfamily in the silkworm Bombyx mori. Based on amino acid sequence and phylogenetic analyses, two new enzymes, swSULT ST1 and swSULT ST2, were identified that appear to belong to a distinct group of SULTs including several other insect SULTs. We expressed, purified, and characterized recombinant SULTs. While swSULT ST1 sulfated xanthurenic acid and pentachlorophenol, swSULT ST2 exclusively utilized xanthurenic acid as a substrate. Based on these results, and those concerning the tissue distribution and substrate specificity toward pentachlorophenol analyses, we hypothesize that swSULT ST1 plays a role in the detoxification of xenobiotics, including insecticides, in the silkworm midgut and in the induction of gametogenesis in silkworm ovary and testis. Collectively, the data obtained herein contribute to a better understanding of SULT enzymatic functions in insects. 相似文献
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The reductive dechlorination of pentachloroaniline (PCA) was investigated in the absence and presence of sulfate in batch
assays using a PCA-dechlorinating mixed anaerobic culture with methanol as the external electron donor at neutral pH and 22°C.
PCA at an initial concentration of 7.8 μM was sequentially dechlorinated to dichlorinated anilines in the sulfate-free culture
and the culture amended with 300 mg sulfate-S/L. At an initial concentration of 890 mg sulfate-S/L, a higher sulfate reduction
rate was achieved, but PCA dechlorination was not observed until the sulfate concentration dropped to about 100 mg S/L. The
transient inhibition of PCA is attributed to competition between sulfate reducing and dechlorinating species for electron
donor, more likely for H2 resulting from methanol fermentation. A long-term (118 days) PCA dechlorination assay with the sulfate-amended culture, which
included five feeding cycles, resulted in accumulation of both sulfide (886 mg S/L) and acetate (1,900 mg COD/L). Under these
conditions, the sulfate reducers were inhibited, while the rate and pathway of PCA dechlorination were not affected. The results
of this study show that the rate of sulfate reduction rather than the sulfate concentration alone dictates the outcome of
the competition between sulfate reducers and either dechlorinators or methanogens. The findings of the present study have
significant implications relative to the fate and transport of PCA and its dechlorination products in sulfate-laden subsurface
systems. 相似文献
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Onome Akpogheneta Steve Dicks Donald Grant Zainab Kanneh Brima Jusu Joseph Edem-Hotah Lansana Kanneh Foday Alhasan Michael Gbakie John Schieffelin Samreen Ijaz Richard Tedder Hilary Bower 《PLoS neglected tropical diseases》2021,15(3)
BackgroundDespite identification 50 years ago, the true burden of Lassa Fever (LF) across Africa remains undefined for reasons including research focus on hospitalised patients, lack of validated field-feasible tools which reliably identify past infection, and the fact that all assays require blood samples making large-scale surveys difficult. Designated a priority pathogen of epidemic potential requiring urgent research by the World Health Organisation, a better understanding of LF sero-epidemiology is essential to developing and evaluating new interventions including vaccines. We describe the first field testing of a novel species-neutral Double Antigen Binding Assay (DABA) designed to detect antibodies to LF in plasma and oral fluid.Methodology/Principal findingsPaired plasma and oral fluid were collected in Sierra Leone from survivors discharged from Kenema Government Hospital Lassa Fever Unit between 1980 and 2018, and from controls recruited in Freetown in 2019. Epidemiological sensitivity and specificity of the DABA measured against historical diagnosis in survivors and self-declared non-exposed controls was 81.7% (95% CI 70.7%– 89.9%) and 83.3% (72.7%- 91.1%) respectively in plasma, and 71.8% (60.0%– 81.9%) and 83.3% (72.7%– 91.1%) respectively in oral fluid. Antibodies were identified in people infected up to 15 years and, in one case, 40 years previously. Participants found oral fluid collection easy and painless with 80% happy to give an oral fluid sample regularly.Conclusions/SignificanceGiven the difficulties of assay validation in a resource-limited setting, including unexpected exposures and diagnostics of varying accuracy, the new assay performed well in both plasma and oral fluid. Sensitivity and specificity are expected to be higher when case/control ascertainment is more definitive and further work is planned to investigate this. Even at the performance levels achieved, the species-neutral DABA has the potential to facilitate the large-scale seroprevalence surveys needed to underpin essential developments in LF control, as well as support zoonotic investigations. 相似文献
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Ali Zainab A. Yasseen Akeel A. McAllister Katherine A. Al-Dujailli Arafat Al-Karaqully Ahmed J. Jumaah Alaa S. 《Molecular biology reports》2022,49(7):6019-6028
Molecular Biology Reports - Autism spectrum disorder (ASD) is an increasing concern among the Iraqi Arab population. The genetic alterations that cause ASD are likely to converge at the synapse.... 相似文献
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Mahboubeh Ebrahimian Sahar Taghavi Maryam Ghoreishi Shahrzad Sedghi Sara Amel Farzad Mohammad Ramezani Maryam Hashemi 《AAPS PharmSciTech》2018,19(3):1029-1036
In this study, co-delivery system was achieved via plasmid encoding TNF related apoptosis inducing ligand (pTRAIL) and doxorubicin (DOX) using carrier based on polypropylenimine (PPI) modified with 10-bromodecanoic acid. Incorporation of alkylcarboxylate chain to PPIs (G4 and G5) could improve transfection efficiency via overcoming the plasma membrane barrier of the cells and decrease cytotoxicity of PPI. Characterization of fabricated NPs revealed that PPI G5 in which 30% of primary amines were substituted by alkyl carboxylate chain (PPI G5-Alkyl 30%) has higher drug loading as compared to the other formulations. PPI G5-Alkyl 30% indicated a decreased drug release may be due to alkyl chains on the surface of PPI, which serve as an additional hindrance for drug diffusion. In vitro cytotoxicity experiments demonstrated that co-delivery system induced apoptosis of tumor cells more efficiently than each of delivery system alone. Furthermore, these results revealed that our combined delivery platform of pTRAIL and DOX using Alkyl-modified PPI G5 can significantly improve the anti-tumor activity and this strategy might develop a new therapeutic window for cancer treatment. 相似文献