排序方式: 共有24条查询结果,搜索用时 15 毫秒
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Caroline Lonez Marc F. Lensink Emilie Kleiren Jean-Marie Vanderwinden Jean-Marie Ruysschaert Michel Vandenbranden 《Cellular and molecular life sciences : CMLS》2010,67(3):483-494
Addition of co-lipids into cationic lipid formulations is considered as promoting cell delivery of DNA by enhancing fusion
processes with cell membranes. Here, by combining FRET and confocal microscopy, we demonstrate that some cationic lipids do
not require a co-lipid to fuse efficiently with cells. These cationic lipids are able to self-organize into bilayers that
are stable enough to form liposomes, while presenting some destabilizing properties reminiscent of the conically shaped fusogenic
co-lipid, DOPE. We therefore analyzed the resident lipid structures in cationic bilayers by molecular dynamics simulations,
clustering the individual lipid structures into populations of similarly shaped molecules, as opposed to the classical approach
of using the static packing parameter to define the lipid shapes. Comparison of fusogenic properties with these lipid populations
suggests that the ratio of cylindrical versus conical lipid populations correlates with the ability to fuse with cell membranes. 相似文献
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Julie Lecomte Krystel Louis Benoit Detry Silvia Blacher Vincent Lambert Sandrine Bekaert Carine Munaut Jenny Paupert Pierre Blaise Jean-Michel Foidart Jean-Marie Rakic Stephen M. Krane Agn��s Noel 《Cellular and molecular life sciences : CMLS》2011,68(4):677-686
In this study, we evaluate the potential involvement of collagenase-3 (MMP13), a matrix metalloproteinase (MMP) family member, in the exudative form of age-related macular degeneration characterized by a neovascularisation into the choroid. RT-PCR analysis revealed that human neovascular membranes issued from patients with AMD expressed high levels of Mmp13. The contribution of MMP13 in choroidal neovascularization (CNV) formation was explored by using a murine model of laser-induced CNV and applying it to wild-type mice (WT) and Mmp13-deficient mice (Mmp13 ?/? mice). Angiogenic and inflammatory reactions were explored by immunohistochemistry. The implication of bone marrow (BM)-derived cells was determined by BM engraftment into irradiated mice and by injecting mesenchymal stem cells (MSC) isolated from WT BM. The deficiency of Mmp13 impaired CNV formation which was fully restored by WT BM engraftment and partially rescued by several injections of WT MSC. The present study sheds light on a novel function of MMP13 during BM-dependent choroidal vascularization and provides evidence for a role for MSC in the pathogenesis of CNV. 相似文献
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Jean-Marie LEHN 《复旦学报(自然科学版)》2007,(5)
1 Results Animate as well as inanimate matter,living organisms as well as materials,are formed of molecules and of the organized entities resulting from the interaction of molecules with each other.Chemistry provides the bridge between the molecules of inanimate matter and the highly complex molecular architectures and systems which make up living organisms. Synthetic chemistry has developed a very powerful set of methods for constructing ever more complex molecules.Supramolecular chemistry seeks to con... 相似文献
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Steinberg KM Antonacci F Sudmant PH Kidd JM Campbell CD Vives L Malig M Scheinfeldt L Beggs W Ibrahim M Lema G Nyambo TB Omar SA Bodo JM Froment A Donnelly MP Kidd KK Tishkoff SA Eichler EE 《Nature genetics》2012,44(8):872-880
The 17q21.31 inversion polymorphism exists either as direct (H1) or inverted (H2) haplotypes with differential predispositions to disease and selection. We investigated its genetic diversity in 2,700 individuals, with an emphasis on African populations. We characterize eight structural haplotypes due to complex rearrangements that vary in size from 1.08-1.49 Mb and provide evidence for a 30-kb H1-H2 double recombination event. We show that recurrent partial duplications of the KANSL1 gene have occurred on both the H1 and H2 haplotypes and have risen to high frequency in European populations. We identify a likely ancestral H2 haplotype (H2') lacking these duplications that is enriched among African hunter-gatherer groups yet essentially absent from West African populations. Whereas H1 and H2 segmental duplications arose independently and before human migration out of Africa, they have reached high frequencies recently among Europeans, either because of extraordinary genetic drift or selective sweeps. 相似文献
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Rabia?Sarroukh Emilie?Cerf Sylvie?Derclaye Yves?F.?Dufrêne Erik?Goormaghtigh Jean-Marie?RuysschaertEmail author Vincent?Raussens 《Cellular and molecular life sciences : CMLS》2011,68(8):1429-1438
Alzheimer’s disease (AD) is a neurodegenerative disorder occurring in the elderly. It is widely accepted that the amyloid
beta peptide (Aβ) aggregation and especially the oligomeric states rather than fibrils are involved in AD onset. We used infrared
spectroscopy to provide structural information on the entire aggregation pathway of Aβ(1–40), starting from monomeric Aβ to
the end of the process, fibrils. Our structural study suggests that conversion of oligomers into fibrils results from a transition
from antiparallel to parallel β-sheet. These structural changes are described in terms of H-bonding rupture/formation, β-strands
reorientation and β-sheet elongation. As antiparallel β-sheet structure is also observed for other amyloidogenic proteins
forming oligomers, reorganization of the β-sheet implicating a reorientation of β-strands could be a generic mechanism determining
the kinetics of protein misfolding. Elucidation of the process driving aggregation, including structural transitions, could
be essential in a search for therapies inhibiting aggregation or disrupting aggregates. 相似文献
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Dujon B Sherman D Fischer G Durrens P Casaregola S Lafontaine I De Montigny J Marck C Neuvéglise C Talla E Goffard N Frangeul L Aigle M Anthouard V Babour A Barbe V Barnay S Blanchin S Beckerich JM Beyne E Bleykasten C Boisramé A Boyer J Cattolico L Confanioleri F De Daruvar A Despons L Fabre E Fairhead C Ferry-Dumazet H Groppi A Hantraye F Hennequin C Jauniaux N Joyet P Kachouri R Kerrest A Koszul R Lemaire M Lesur I Ma L Muller H Nicaud JM Nikolski M Oztas S Ozier-Kalogeropoulos O Pellenz S 《Nature》2004,430(6995):35-44
Identifying the mechanisms of eukaryotic genome evolution by comparative genomics is often complicated by the multiplicity of events that have taken place throughout the history of individual lineages, leaving only distorted and superimposed traces in the genome of each living organism. The hemiascomycete yeasts, with their compact genomes, similar lifestyle and distinct sexual and physiological properties, provide a unique opportunity to explore such mechanisms. We present here the complete, assembled genome sequences of four yeast species, selected to represent a broad evolutionary range within a single eukaryotic phylum, that after analysis proved to be molecularly as diverse as the entire phylum of chordates. A total of approximately 24,200 novel genes were identified, the translation products of which were classified together with Saccharomyces cerevisiae proteins into about 4,700 families, forming the basis for interspecific comparisons. Analysis of chromosome maps and genome redundancies reveal that the different yeast lineages have evolved through a marked interplay between several distinct molecular mechanisms, including tandem gene repeat formation, segmental duplication, a massive genome duplication and extensive gene loss. 相似文献
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Manfred F. R. Kets De Vries Danny Miller Jean-Marie Toulouse Peter H. Friesen Maurice Boisvert Roland Theriault 《Journal of forecasting》1984,3(2):161-172
It was hypothesized that there are important non-linear life-cycle influences upon job and organizational satisfaction. Five common life-cycle stages were identified from the literature: the phases of ‘reality shock’, ‘socialization and growth’, ‘mid-career crisis’, ‘acceptance’, and ‘pre-retirement’. The first, third and last stages were expected to show declines in job and organizational satisfaction because of the personal and job-related disappointments and crises that typically occur during these periods of life. The second and fourth stages were expected to show increases in satisfaction because of the pleasant life experiences that often occur then. All but the first stage supported these hypotheses when we controlled for the influence of sex, education, job experience, level in the hierarchy and occupational upward mobility. 相似文献