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81.
Vazeille E Slimani L Claustre A Magne H Labas R Béchet D Taillandier D Dardevet D Astruc T Attaix D Combaret L 《The Journal of nutritional biochemistry》2012,23(3):245-251
Immobilization is characterized by activation of the ubiquitin (Ub)-proteasome-dependent proteolytic system (UPS) and of the mitochondrial apoptotic pathway. Increased oxidative stress and inflammatory response occur in immobilized skeletal muscles. Curcumin exhibits antioxidant and anti-inflammatory properties, blocked proteasome activation in intact animals, and may favor skeletal muscle regeneration. We therefore measured the effects of curcumin on immobilization-induced muscle atrophy and subsequent recovery. Rats were subjected to hindlimb immobilization for 8 days (I8) and allowed to recover for 10 days (R10). Fifty percent of the rats were injected daily with either curcumin or vehicle. Proteolytic and apoptotic pathways were studied in gastrocnemius muscles. Curcumin treatment prevented the enhanced proteasome chymotrypsin-like activity and the trend toward increased caspase-9-associated apoptosome activity at I8 in immobilized muscles. By contrast, the increase of these two activities was blunted by curcumin at R10. Curcumin did not reduce muscle atrophy at I8 but improved muscle recovery at R10 and the cross-sectional area of muscle fibers of immobilized muscles. Curcumin reduced the increased protein levels of Smac/DIABLO induced by immobilization and enhanced the elevation of X-linked inhibitory apoptotic protein levels at R10. Ub-conjugate levels and caspase-3 activity increased at I8 and were normalized at R10 without being affected by curcumin treatment. Altogether, the data show that curcumin treatment improved recovery during reloading. The effect of curcumin during the atrophic phase on proteasome activities may facilitate the initiation of muscle recovery after reloading. These data also suggest that this compound may favor the initial steps of muscle regeneration. 相似文献
82.
83.
One of the main motivations to study amphioxus is its potential for understanding the last common ancestor of chordates, which notably gave rise to the vertebrates. An important feature in this respect is the slow evolutionary rate that seems to have characterized the cephalochordate lineage, making amphioxus an interesting proxy for the chordate ancestor, as well as a key lineage to include in comparative studies. Whereas slow evolution was first noticed at the phenotypic level, it has also been described at the genomic level. Here, we examine whether the amphioxus genome is indeed a good proxy for the genome of the chordate ancestor, with a focus on protein-coding genes. We investigate genome features, such as synteny, gene duplication and gene loss, and contrast the amphioxus genome with those of other deuterostomes that are used in comparative studies, such as Ciona, Oikopleura and urchin. 相似文献
84.
Jean-Etienne Bassard Ludovic Richert Jan Geerinck Hugues Renault Frédéric Duval Pascaline Ullmann Martine Schmitt Etienne Meyer Jer?me Mutterer Wout Boerjan Geert De Jaeger Yves Mely Alain Goossens Danièle Werck-Reichhart 《The Plant cell》2012,24(11):4465-4482
Supramolecular organization of enzymes is proposed to orchestrate metabolic complexity and help channel intermediates in different pathways. Phenylpropanoid metabolism has to direct up to 30% of the carbon fixed by plants to the biosynthesis of lignin precursors. Effective coupling of the enzymes in the pathway thus seems to be required. Subcellular localization, mobility, protein–protein, and protein–membrane interactions of four consecutive enzymes around the main branch point leading to lignin precursors was investigated in leaf tissues of Nicotiana benthamiana and cells of Arabidopsis thaliana. CYP73A5 and CYP98A3, the two Arabidopsis cytochrome P450s (P450s) catalyzing para- and meta-hydroxylations of the phenolic ring of monolignols were found to colocalize in the endoplasmic reticulum (ER) and to form homo- and heteromers. They moved along with the fast remodeling plant ER, but their lateral diffusion on the ER surface was restricted, likely due to association with other ER proteins. The connecting soluble enzyme hydroxycinnamoyltransferase (HCT), was found partially associated with the ER. Both HCT and the 4-coumaroyl-CoA ligase relocalized closer to the membrane upon P450 expression. Fluorescence lifetime imaging microscopy supports P450 colocalization and interaction with the soluble proteins, enhanced by the expression of the partner proteins. Protein relocalization was further enhanced in tissues undergoing wound repair. CYP98A3 was the most effective in driving protein association. 相似文献
85.
M Hersch B Peter HM Kang F Schüpfer H Abriel T Pedrazzini E Eskin JS Beckmann S Bergmann F Maurer 《PloS one》2012,7(7):e41032
β-blockers and β-agonists are primarily used to treat cardiovascular diseases. Inter-individual variability in response to both drug classes is well recognized, yet the identity and relative contribution of the genetic players involved are poorly understood. This work is the first genome-wide association study (GWAS) addressing the values and susceptibility of cardiovascular-related traits to a selective β(1)-blocker, Atenolol (ate), and a β-agonist, Isoproterenol (iso). The phenotypic dataset consisted of 27 highly heritable traits, each measured across 22 inbred mouse strains and four pharmacological conditions. The genotypic panel comprised 79922 informative SNPs of the mouse HapMap resource. Associations were mapped by Efficient Mixed Model Association (EMMA), a method that corrects for the population structure and genetic relatedness of the various strains. A total of 205 separate genome-wide scans were analyzed. The most significant hits include three candidate loci related to cardiac and body weight, three loci for electrocardiographic (ECG) values, two loci for the susceptibility of atrial weight index to iso, four loci for the susceptibility of systolic blood pressure (SBP) to perturbations of the β-adrenergic system, and one locus for the responsiveness of QTc (p<10(-8)). An additional 60 loci were suggestive for one or the other of the 27 traits, while 46 others were suggestive for one or the other drug effects (p<10(-6)). Most hits tagged unexpected regions, yet at least two loci for the susceptibility of SBP to β-adrenergic drugs pointed at members of the hypothalamic-pituitary-thyroid axis. Loci for cardiac-related traits were preferentially enriched in genes expressed in the heart, while 23% of the testable loci were replicated with datasets of the Mouse Phenome Database (MPD). Altogether these data and validation tests indicate that the mapped loci are relevant to the traits and responses studied. 相似文献
86.
Yann Neuzillet Xavier Paoletti Slah Ouerhani Pierre Mongiat-Artus Hany Soliman Hugues de The Mathilde Sibony Yves Denoux Vincent Molinie Aurélie Herault May-Linda Lepage Pascale Maille Audrey Renou Dimitri Vordos Claude-Clément Abbou Ashraf Bakkar Bernard Asselain Nadia Kourda Amel El Gaaied Karen Leroy Agnès Laplanche Simone Benhamou Thierry Lebret Yves Allory Fran?ois Radvanyi 《PloS one》2012,7(12)
TP53 and FGFR3 mutations are the most common mutations in bladder cancers. FGFR3 mutations are most frequent in low-grade low-stage tumours, whereas TP53 mutations are most frequent in high-grade high-stage tumours. Several studies have reported FGFR3 and TP53 mutations to be mutually exclusive events, whereas others have reported them to be independent. We carried out a meta-analysis of published findings for FGFR3 and TP53 mutations in bladder cancer (535 tumours, 6 publications) and additional unpublished data for 382 tumours. TP53 and FGFR3 mutations were not independent events for all tumours considered together (OR = 0.25 [0.18–0.37], p = 0.0001) or for pT1 tumours alone (OR = 0.47 [0.28–0.79], p = 0.0009). However, if the analysis was restricted to pTa tumours or to muscle-invasive tumours alone, FGFR3 and TP53 mutations were independent events (OR = 0.56 [0.23–1.36] (p = 0.12) and OR = 0.99 [0.37–2.7] (p = 0.35), respectively). After stratification of the tumours by stage and grade, no dependence was detected in the five tumour groups considered (pTaG1 and pTaG2 together, pTaG3, pT1G2, pT1G3, pT2-4). These differences in findings can be attributed to the putative existence of two different pathways of tumour progression in bladder cancer: the CIS pathway, in which FGFR3 mutations are rare, and the Ta pathway, in which FGFR3 mutations are frequent. TP53 mutations occur at the earliest stage of the CIS pathway, whereas they occur would much later in the Ta pathway, at the T1G3 or muscle-invasive stage. 相似文献
87.
Lorenzo Galluzzi Ilio Vitale Laura Senovilla Tobias Eisenberg Didac Carmona-Gutierrez Erika Vacchelli Thomas Robert Hugues Ripoche Nora J?gemann Caroline Paccard Nicolas Servant Philippe Hupé Vladimir Lazar Philippe Dessen Emmanuel Barillot Hans Zischka Frank Madeo Guido Kroemer 《Cell cycle (Georgetown, Tex.)》2012,11(18):3472-3480
88.
A survey on filter techniques for feature selection in gene expression microarray analysis 总被引:1,自引:0,他引:1
Lazar C Taminau J Meganck S Steenhoff D Coletta A Molter C de Schaetzen V Duque R Bersini H Nowé A 《IEEE/ACM transactions on computational biology and bioinformatics / IEEE, ACM》2012,9(4):1106-1119
A plenitude of feature selection (FS) methods is available in the literature, most of them rising as a need to analyze data of very high dimension, usually hundreds or thousands of variables. Such data sets are now available in various application areas like combinatorial chemistry, text mining, multivariate imaging, or bioinformatics. As a general accepted rule, these methods are grouped in filters, wrappers, and embedded methods. More recently, a new group of methods has been added in the general framework of FS: ensemble techniques. The focus in this survey is on filter feature selection methods for informative feature discovery in gene expression microarray (GEM) analysis, which is also known as differentially expressed genes (DEGs) discovery, gene prioritization, or biomarker discovery. We present them in a unified framework, using standardized notations in order to reveal their technical details and to highlight their common characteristics as well as their particularities. 相似文献
89.
Schann S Greney H Gasparik V Dontenwill M Rascente C Lacroix G Monassier L Bruban V Feldman J Ehrhardt JD Bousquet P 《Bioorganic & medicinal chemistry》2012,20(15):4710-4715
Methylated analogues of imidazoline related compounds (IRC) were prepared; their abilities to bind I(1) imidazoline receptors (I(1)Rs), I(2) imidazoline binding sites (I(2)BS) and α(2)-adrenoceptor subtypes (α(2)ARs) were assessed. Methylation of the heterocyclic moiety of IRC resulted in a significant loss of α(2)AR affinity. Amongst the selective ligands obtained, LNP 630 (4) constitutes the first highly selective I(1)R agent showing hypotensive activity after intravenous administration. 相似文献
90.
Muffato M Roest Crollius H 《BioEssays : news and reviews in molecular, cellular and developmental biology》2008,30(2):122-134
Knowledge of the structure of ancestral genomes provides the basis of a new framework to better represent and interpret results from genomic and evolutionary studies. Because these ancestors lived tens of hundreds of million years ago, this knowledge will inevitably take the form of abstract representations, reconstructed on the basis both of experimental evidence collected on extant genomes and of our understanding of evolutionary processes. This is the field of Paleogenomics, a young discipline that is providing an increasingly precise picture of our ancestral vertebrate genomes based on cytogenetic data, genome sequences and new algorithmic developments. Many recent studies have focused on the ancestral placental mammal and teleost fish genomes, although the outlines of even more distant pre-vertebrate ancestors are being reported. 相似文献