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排序方式: 共有175条查询结果,搜索用时 15 毫秒
21.
In this paper, the molecular interactions in isolated mammalian nuclei of three ruthenium complexes, which are putative antineoplastic chemotherapeutic agents effective in reducing metastatic tumours in vivo, have been investigated and compared with the well-known antitumour drug CDDP (cis-diamminedichloroplatinum). The compounds studied are: Natrans-RuCl4(DMSO)Imidazole (NAMI), Natrans-RuCl4(DMSO)Oxazole (NAOX) and Natrans-RuCl4(TMSO)- Isoquinoline (TEQU). This study shows that the drugs bind to DNA but induce few, if any, DNA interstrand crosslinks, which are considered as the main biological lesions involved in the cytotoxic activity of several already known antitumour drugs, whilst in the same experimental conditions, CDDP is confirmed to induce them. On the other hand, proteins appear to be an important target in the cell for these drugs, since proteins-DNA crosslinks are shown to be induced by the complexes. Moreover, we investigated Ru complexes for their direct cytotoxicity on V79 cells in culture, showing that two of them (NAMI and NAOX) do not significantly reduce the cloning efficiency of the cells even at concentrations as high as 2-3 mg/ml: only TEQU both reduces cloning efficiency and induces a significant number of mutants in V79 cells in culture. 相似文献
22.
Pani G Koch OR Galeotti T 《The international journal of biochemistry & cell biology》2009,41(5):1002-1005
Once considered as a mere by-product of respiration, mitochondrial generation of reactive oxygen species (ROS) has recently emerged as a genetically controlled phenomenon, involved in complex intracellular signal transduction cascades that directly regulate cell survival and death in responses to environmental stressors. These cascades are involved in the pathogenesis of several major age-related diseases, such as cancer and neurodegeneration, and also appear to somehow regulate the "normal" ageing process. The present short review summarizes recent discoveries on mitochondrial reactive oxygen species regulation by p53, a tumor suppressor protein and p66shc, a protein implicated in the life-span determination. It also outlines the emerging network whereby these molecules cross-talk with each other and with the mitochondrial antioxidant system, namely MnSOD (SOD2), another life-span determining protein, to regulate oxidative stress in the organelle. This molecular circuit, which comprises two genetic determinants of longevity and a major tumor suppressor gene, also provides a theoretical framework connecting senescence and cancer. 相似文献
23.
Shi Yu Tillmann Falck Anneleen Daemen Leon-Charles Tranchevent Johan AK Suykens Bart De Moor Yves Moreau 《BMC bioinformatics》2010,11(1):309
Background
This paper introduces the notion of optimizing different norms in the dual problem of support vector machines with multiple kernels. The selection of norms yields different extensions of multiple kernel learning (MKL) such as L ∞, L 1, and L 2 MKL. In particular, L 2 MKL is a novel method that leads to non-sparse optimal kernel coefficients, which is different from the sparse kernel coefficients optimized by the existing L ∞ MKL method. In real biomedical applications, L 2 MKL may have more advantages over sparse integration method for thoroughly combining complementary information in heterogeneous data sources. 相似文献24.
Cristina D. Orrù Claudia Abete M. Dolores Cannas Claudia Mulas Claudia Norfo Antonella Mandas Sarah Vascellari Paolo La Colla Sandra Dessì Alessandra Pani 《Central European Journal of Biology》2010,5(1):31-37
Scrapie is a prion disease for which no means of ante-mortem diagnosis is available. We recently found a relationship between
cell susceptibility to scrapie and altered cholesterol homeostasis. In brains and in skin fibroblasts and peripheral blood
mononuclear cells from healthy and scrapie-affected sheep carrying a scrapie-susceptible genotype, the levels of cholesterol
esters were consistently higher than in tissues and cultures derived from animals with a scrapie-resistant genotype. Here
we show that intracellular accumulation of cholesterol esters (CE) in fibroblasts derived from scrapie-susceptible sheep was
accompanied by parallel alterations in the expression level of acyl-coenzymeA: cholesterol-acyltransferase (ACAT1) and caveolin-1
(Cav-1) that are involved in the pathways leading to intracellular cholesterol esterification and trafficking. Comparative
analysis of cellular prion protein (PrPc) mRNA, showed an higher expression level in cells from animals carrying a susceptible
genotype, with or without Scrapie. These data suggest that CE accumulation in peripheral cells, together with the altered
expression of some proteins implicated in intracellular cholesterol homeostasis, might serve to identify a distinctive lipid
metabolic profile associated with increased susceptibility to develop prion disease following infection. 相似文献
25.
A. Pavan-Kumar P. Gireesh-Babu P. P. Suresh Babu A. K. Jaiswar V. Hari Krishna K. Pani Prasasd Aparna Chaudhari S. G. Raje S. K. Chakraborty Gopal Krishna W. S. Lakra 《Molecular biology reports》2014,41(1):447-457
The elasmobranchs (sharks, rays and skates) being the extant survivors of one of the earliest offshoots of the vertebrate evolutionary tree are good model organisms to study the primitive vertebrate conditions. They play a significant role in maintaining the ecological balance and have high economic value. Due to over-exploitation and illegal fishing worldwide, the elasmobranch stocks are being decimated at an alarming rate. Appropriate management measures are necessary for restoring depleted elasmobranch stocks. One approach for restoring stocks is implementation of conservation measures and these measures can be formulated effectively by knowing the evolutionary relationship among the elasmobranchs. In this study, a total of 30 species were chosen for molecular phylogeny studies using mitochondrial cytochrome c oxidase subunit I, 12S ribosomal RNA gene and nuclear Internal Transcribed Spacer 2. Among different genes, the combined dataset of COI and 12S rRNA resulted in a well resolved tree topology with significant bootstrap/posterior probabilities values. The results supported the reciprocal monophyly of sharks and batoids. Within Galeomorphii, Heterodontiformes (bullhead sharks) formed as a sister group to Lamniformes (mackerel sharks): Orectolobiformes (carpet sharks) and to Carcharhiniformes (ground sharks). Within batoids, the Myliobatiformes formed a monophyly group while Pristiformes (sawfishes) and Rhinobatiformes (guitar fishes) formed a sister group to all other batoids. 相似文献
26.
27.
The Indian black berry (Syzygium cumini Skeels) has a great nutraceutical and medicinal properties. As in other fruit crops, the
fruit characteristics are important attributes for differentiation were also determined for different accessions of S. cumini. The fruit
weight, length, breadth, length: breadth ratio, pulp weight, pulp content, seed weight and pulp: seed ratio significantly varied in
different accessions. Molecular characterization was carried out using PCR based RAPD technique. Out of 80 RAPD primers, only
18 primers produced stable polymorphisms that were used to examine the phylogenetic relationship. A sum of 207 loci were
generated out of which 201 loci found polymorphic. The average genetic dissimilarity was 97 per cent among jamun accessions.
The phylogenetic relationship was also determined by principal coordinates analysis (PCoA) that explained 46.95 per cent
cumulative variance. The two-dimensional PCoA analysis showed grouping of the different accessions that were plotted into four
sub-plots, representing clustering of accessions. The UPGMA (r = 0.967) and NJ (r = 0.987) dendrogram constructed based on the
dissimilarity matrix revealed a good degree of fit with the cophenetic correlation value. The dendrogram grouped the accessions
into three main clusters according to their eco-geographical regions which given useful insight into their phylogenetic
relationships. 相似文献
28.
不同耕作措施对冬小麦-夏玉米复种连作系统土壤有机碳和水分利用效率的影响 总被引:2,自引:1,他引:1
在连续8年田间定位试验的基础上,分析了关中平原冬小麦 夏玉米复种连作系统2008—2009年连续两个生长季期间不同耕作措施(结合秸秆还田和不还田)对土壤有机碳和水分利用率的影响.结果表明: 相对于传统耕作,保护性耕作有利于土壤有机碳、水分利用效率和作物产量的提高,其中在“深松+秸秆还田”耕作模式下的增幅最高,土壤有机碳含量在0~30 cm土层增幅达到19.5%,水分利用效率和作物产量提高了16.9%和20.5%,而免耕模式则有效提高了0~10 cm土层有机碳含量.在该地区土壤和气候条件下,深松结合秸秆粉碎还田是最理想的耕作模式,最有利于土壤有机碳累积,并提高水分利用效率和作物产量. 相似文献
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