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排序方式: 共有969条查询结果,搜索用时 15 毫秒
1.
2.
Laurent Chatel-Chaix Marie-Anne Germain Alena Motorina éric Bonneil Pierre Thibault Martin Baril Daniel Lamarre 《Journal of virology》2013,87(21):11704-11720
Hepatitis C virus (HCV) orchestrates the different stages of its life cycle in time and space through the sequential participation of HCV proteins and cellular machineries; hence, these represent tractable molecular host targets for HCV elimination by combination therapies. We recently identified multifunctional Y-box-binding protein 1 (YB-1 or YBX1) as an interacting partner of NS3/4A protein and HCV genomic RNA that negatively regulates the equilibrium between viral translation/replication and particle production. To identify novel host factors that regulate the production of infectious particles, we elucidated the YB-1 interactome in human hepatoma cells by a quantitative mass spectrometry approach. We identified 71 YB-1-associated proteins that included previously reported HCV regulators DDX3, heterogeneous nuclear RNP A1, and ILF2. Of the potential YB-1 interactors, 26 proteins significantly modulated HCV replication in a gene-silencing screening. Following extensive interaction and functional validation, we identified three YB-1 partners, C1QBP, LARP-1, and IGF2BP2, that redistribute to the surface of core-containing lipid droplets in HCV JFH-1-expressing cells, similarly to YB-1 and DDX6. Importantly, knockdown of these proteins stimulated the release and/or egress of HCV particles without affecting virus assembly, suggesting a functional YB-1 protein complex that negatively regulates virus production. Furthermore, a JFH-1 strain with the NS3 Q221L mutation, which promotes virus production, was less sensitive to this negative regulation, suggesting that this HCV-specific YB-1 protein complex modulates an NS3-dependent step in virus production. Overall, our data support a model in which HCV hijacks host cell machinery containing numerous RNA-binding proteins to control the equilibrium between viral RNA replication and NS3-dependent late steps in particle production. 相似文献
3.
M A Axelos J F Thibault J Lefebvre 《International journal of biological macromolecules》1989,11(3):186-191
Citrus pectins with degrees of methylation between 30 and 72% were carefully characterized in order to determine their charge density and molecular weight distribution, the content in galacturonic acid and in neutral sugars, the degree of methylation and acetylation. Using enzymic degradation it has been found that pectin molecules consist mainly of long homogalacturonan regions with some regions of neutral sugars as side chains attached on rhamnose residues. The viscometric behaviour of the different samples indicates that 0.1 M NaCl, at 25 degrees C, is a good solvent of sodium pectinates. From the evolution of the Huggins parameter, it appears that pectins with 50% of methylated galacturonic groups exhibit a maximum flexibility. A Mark-Houwink exponent of 0.8 has been found in good agreement with theoretical predictions for flexible polymers in a good solvent. 相似文献
4.
An analytical model of traumatic diffuse brain injury 总被引:3,自引:0,他引:3
Diffuse axonal injury (DAI) with prolonged coma has been produced in the primate using an impulsive, rotational acceleration of the head without impact. This pathophysiological entity has been studied subsequently from a biomechanics perspective using physical models of the skull-brain structure. Subjected to identical loading conditions as the primate, these physical models permit one to measure the deformation within the surrogate brain tissue as a function of the forces applied to the head. An analytical model designed to approximate these experiments has been developed in order to facilitate an analysis of the parameters influencing brain deformation. These three models together are directed toward the development of injury tolerance criteria based upon the shear strain magnitude experienced by the deep white matter of the brain. The analytical model geometry consists of a rigid, right-circular cylindrical shell filled with a Kelvin-Voigt viscoelastic material. Allowing no slip on the boundary, the shell is subjected to a sudden, distributed, axisymmetric, rotational load. A Fourier series representation of the load allows unrestricted load-time histories. The exact solution for the relative angular displacement (V) and the infinitesimal shear strain (epsilon) at any radial location in the viscoelastic material with respect to the shell was determined.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
5.
Y. Tillet M. Batailler M. Krieger-Poullet J. Thibault 《Histochemistry and cell biology》1990,93(3):327-333
Summary Antisera were raised in rabbits against dopamine or noradrenaline conjugated to thyroglobulin with glutaraldehyde. These antisera, tested in enzyme linked immunosorbent assay and immunohistochemistry specifically recognized their homologous antigens.With the aid of anti-tyrosine hydroxylase, anti-aromatic aminoacid decarboxylase, anti-dopamine--hydroxylase, anti-dopamine, and anti-noradrenaline antisera, immunohistochemical reactions were performed on glutaraldehyde fixed sections of sheep diencephalon in order to determine the presence of dopamine in the catecholaminergic group A15. Perikarya of this nucleus were stained with anti-tyrosine hydroxylase, anti-aromatic aminoacid decarboxylase and anti-dopamine, but not with anti-dopamine--hydroxylase or anti-noradrenaline. Both of these latter antisera stained fibers within this area. So as recently found in the rat, we could conclude that dopamine is present in group A15 of the sheep. 相似文献
6.
Summary Mapping of monoaminergic systems in the brain of the newt Triturus alpestris was achieved with antisera against (1) thyrosine hydroxylase (TH), (2) formaldehyde-conjugated dopamine (DA), and (3) formaldehyde-conjugated serotonin (5-HT). In the telencephalon, the striatum was densely innervated by a large number of 5-HT-, DA-and TH-immunoreactive (IR) fibers; IR fibers were more scattered in the amygdala, the medial and lateral forebrain bundles, and the anterior commissure. In the anterior and medial diencephalon, TH-IR perikarya contacting the cerebrospinal fluid (CSF-C perikarya) were located in the preoptic recess organ (PRO), the organum vasculosum laminae terminalis and the suprachiasmatic nucleus. Numerous TH-IR perikarya, not contacting the CSF, were present in the posterior preoptic nucleus and the ventral thalamus. At this level, DA-IR CSF-C neurons were only located in the PRO. In the posterior diencephalon, large populations of 5-HT-IR and DA-IR CSF-C perikarya were found in the paraventricular organ (PVO) and the nucleus infundibularis dorsalis (NID); the dorsal part of the NID additionally presented TH-IR CSF-C perikarya. Most regions of the diencephalon showed an intense monoaminergic innervation. In addition, numerous TH-IR, DA-IR and 5-HT-IR fibers, orginating from the anterior and posterior hypothalamic nuclei, extended ventrally and reached the median eminence and the pars intermedia of the pituitary gland. In the midbrain, TH-IR perikarya were located dorsally in the pretectal area. Ventrally, a large group of TH-IR cell bodies and some weakly stained DA-IR and 5-HT-IR neurons were observed in the posterior tuberculum. No dopaminergic system equivalent to the substantia nigra was revealed. The possible significance of the differences in the distribution of TH-IR and DA-IR neurons is discussed, with special reference to the CSF-C neurons.Abbreviations
AM
amygdala
-
CAnt
commissura anterior
-
CH
commissura hippocampi
-
CP
commissura posterior
-
Ctm
commissura tecti mesencephali
-
DH
dorsal hypothalamus
-
DTh
dorsal thalamus
-
FLM
fasciculus longitudinalis medialis
-
Fsol
fasciculus solitarius
-
H
habenula
-
LFB
lateral forebrain bundle
-
ME
median eminence
-
MFB
medial forebrain bundle
-
NID
nucleus infundibularis dorsalis
-
nIP
neuropil of nucleus interpeduncularis
-
NPOP
nucleus preopticus posterior
-
NS
nucleus septi
-
OVLT
organum vasculosum laminae terminalis
-
PD
pars distalis
-
Pdo
dorsal pallium
-
PHi
primordium hippocampi
-
PI
pars intermedia
-
Pl
lateral pallium
-
PN
pars nervosa
-
PRO
preoptic recess organ
-
Ptec
pretectal area
-
PVO
paraventricular organ
-
Ra
nucleus raphe
-
Rm
nucleus reticularis medius
-
SCO
subcommisural organ
-
ST
striatum; strm stria medullaris thalami
-
strt
stria terminalis thalami
-
TM
tegmentum mesencephali
-
TO
tectum opticum
-
TP
tuberculum posterius
-
trch
tractus cortico-habenularis
-
trmp
tractus mamillopeduncularis
-
VH
ventral hypothalamus
-
Vm
nucleus motorius nervi trigemini
-
VTh
ventral thalamus
-
II
optic nerve 相似文献
7.
R Garcia M Cantin A De Léan J Genest J Godin J Gutkowska E L Schiffrin G Thibault 《Biochemical and biophysical research communications》1986,135(3):987-993
The biological activities of ANF (Arg 101-Tyr 126) and of the circulating form, ANF (Ser 99-Tyr 126), were compared in the following assays: precontracted rabbit aortic strip and chick rectum, rat natriuresis, inhibition of aldosterone secretion and receptor affinity in bovine and rat adrenal zona glomerulosa cells, and receptor affinity in rabbit aorta and rat mesenteric artery cells. The results demonstrate that both peptides share the same biological activities. It is concluded that the addition of two amino acids to the N-terminal of ANF (Arg 101-Tyr 126) does not modify its biological characteristics, validating thus previous research employing this peptide. 相似文献
8.
F Carrier G Thibault E L Schiffrin R Garcia J Gutkowska M Cantin J Genest 《Biochemical and biophysical research communications》1985,132(2):666-673
Specific receptors for atrial natriuretic factor (ANF) have been identified and solubilized in glomeruli from rat kidney. Radioiodinated synthetic ANF (Arg 101-Tyr 126) bound to a single class of high affinity (Kd 27 +/- 24 pM) sites with a density of 390 +/- 230 fmole/mg protein. The binding was time- and temperature-dependent, saturable and reversible. The ANF-receptor complex was not affected by angiotensin II, ACTH or vasopressin. Solubilization with 10 mM 3-[(3-cholamidopropyl)-dimethylammonio]- 1-propane sulfonate (CHAPS) slightly increased the affinity for ANF (Kd 5.0 +/- 3.3 pM) without affecting the density (250 +/- 110 fmole/mg protein). Similar results were found with 1% Triton X-100. ANF-related peptides interact generally in the same way with non-solubilized and solubilized receptors, indicating a fully preserved specificity of the receptors. 相似文献
9.
Identification of a biologically active circulating form of rat atrial natriuretic factor 总被引:7,自引:0,他引:7
G Thibault C Lazure E L Schiffrin J Gutkowska L Chartier R Garcia N G Seidah M Chrétien J Genest M Cantin 《Biochemical and biophysical research communications》1985,130(3):981-986
An atrial natriuretic peptide has been isolated from plasma of morphine treated rats by means of glass beads extraction, immunoaffinity chromatography, and reverse phase HPLC. 1.3 micrograms of immunoreactive material was obtained. The biological activity of this material was found comparable to that of ANF (Arg 101 - Tyr 126) on the inhibition of basal aldosterone secretion by rat adrenal zona glomerulosa cells and the displacement curve of iodinated ANF from ANF receptors in a mesenteric artery preparation. Gas phase amino acid sequencing indicated that it is related to ANF (Ser 99 - Tyr 126). These results suggest that the maturation of ANF may require a tryptic-like cleavage after a single Arg residue. 相似文献
10.
The purpose of this study was to determine the influence of metabolic stresses, such as endurance training and chronic isoproterenol treatment, on skeletal muscle sensitivity to norepinephrine. Using an isolated perfused rat hindlimb preparation, dose-response curves for skeletal muscle oxygen consumption (VO2) and vascular resistance were obtained with control, endurance trained, and isoproterenol treated rats. No significant difference was found between control and experimental groups for non-stimulated VO2. In response to NE infusion, trained rats showed a significantly greater increase in VO2 compared to control rats while the response of the isoproterenol treated rats was of the same magnitude as the one for their respective control rats. At the highest dose of NE infused, the vasopressor response was significantly lower in trained rats compared to control rats. At none of the doses was there a significant difference in the vasopressor response between control and isoproterenol treated rats. These results suggest that repeated exposures to high levels of catecholamines, as produced during endurance training, leads to an increased sensitivity of skeletal muscle to the effect of norepinephrine. 相似文献