Search results for "Secretory"
showing 10 items of 150 documents
Effects of Escherichia coli hemolysin on human monocytes. Cytocidal action and stimulation of interleukin 1 release.
1990
Abstract This study reports on the potent cytocidal and interleukin-1 releasing properties of Escherichia coli hemolysin (ECH) on human monocytes. Nanomolar concentrations of purified ECH (250-2,000 ng/ml) caused rapid and irreversible depletion of cellular ATP to levels below 20% of controls within 60 min. Subcytocidal doses (10-200 ng/ml) of ECH induced rapid release within 60-120 min of large amounts of interleukin 1 beta (IL-1 beta) from cultured monocytes. IL-1 beta release occurred in the presence of actinomycin D and cycloheximide, and was thus probably due to processing and export of intracellular IL-1 beta precursor. Incubation of toxin-producing E. coli at ratios of only 0.3-3 col…
Stx5 is a novel interactor of VLDL-R to affect its intracellular trafficking and processing
2012
We identified syntaxin 5 (Stx5), a protein involved in intracellular vesicle trafficking, as a novel interaction partner of the very low density lipoprotein (VLDL)-receptor (VLDL-R), a member of the LDL-receptor family. In addition, we investigated the effect of Stx5 on VLDL-R maturation, trafficking and processing. Here, we demonstrated mutual association of both proteins using several in vitro approaches. Furthermore, we detected a special maturation phenotype of VLDL-R resulting from Stx5 overexpression. We found that Stx5 prevented advanced Golgi-maturation of VLDL-R, but did not cause accumulation of the immature protein in ER, ER to Golgi compartments, or cis-Golgi ribbon, the main ex…
The neural feedback loop between the brain and adipose tissues
2009
Communication également publiée dans le livre "Adipose tissue development: from animal models to clinical conditions" (ISBN 978-3-8055-9450-9) de C. Levy-Marchal et L. Pénicaud (eds); There are more and more data supporting the importance of nervous regulation of both white and brown adipose tissue mass. This short paper will review the different physiological parameters which are regulated such as metabolism (lipolysis and thermogeneis), secretory activity (leptin and other adipokines) but also to plasticity of adipose tissues (proliferation differentiation and apoptosis). The sensory innervation of white adipose issue and its putative role will be also described. Altogether these results …
Tumor necrosis factor (TNF)-alpha but not TNF-beta induces secretion of colony stimulating factor for macrophages (CSF-1) by human monocytes
1987
Abstract Tumor necrosis factor (TNF)-alpha has been identified as a major inducer of colony stimulating factor (CSF)-secretion by human vascular endothelial cells and fibroblasts. In the present study we assessed the capacity of TNFs to induce release of CSF-1 from highly purified peripheral blood monocyte preparations. Whereas monocytes do not accumulate CSF-1 messenger (m)RNA constitutively and consequently do not produce CSF-1 protein, CSF-1 mRNA and protein secretion became detectable, when monocytes were cultured in the presence of TNF-alpha, that was synergistically enhanced by interferon-gamma (IFN-gamma). However, under identical experimental conditions TNF-beta failed to induce mon…
A new insight into the three-dimensional architecture of the Golgi complex: Characterization of unusual structures in epididymal principal cells.
2017
Principal epididymal cells have one of the largest and more developed Golgi complex of mammalian cells. In the present study, we have used this cell as model for the study of the three-dimensional architecture of the Golgi complex of highly secretory and endocytic cells. Electron tomography demonstrated the presence in this cell type of some unknown or very unusual Golgi structures such as branched cisternae, pocket-like cisternal invaginations or tubular connections. In addition, we have used this methodology and immunoelectron microscopy to analyze the close relationship between this organelle and both the endoplasmic reticulum and microtubules, and to describe in detail how these element…
Serine/threonine-kinase 33 (Stk33) – Component of the neuroendocrine network?
2016
The present study was conducted to investigate the expression of serine/threonine-kinase 33 (Stk33) in neuronal structures of the central nervous system in rat and hamster as well as the presence of the protein in the brain of higher mammals, using a polyclonal antibody on cryosections of fixed brains. We found a distinct immunostaining pattern that included intense fluorescence of the ependymal lining of cerebral ventricles, and of hypothalamic tanycytes and their processes. We further observed intense staining of magnocellular neurons in the hypothalamic paraventricular, supraoptic and accessory neurosecretory nuclei, in particular the circular nuclei, and less intense stained neurons in …
Transport of the major myelin proteolipid protein is directed by VAMP3 and VAMP7.
2011
CNS myelination by oligodendrocytes requires directed transport of myelin membrane components and a timely and spatially controlled membrane expansion. In this study, we show the functional involvement of the R-solubleN-ethylmaleimide-sensitive factor attachment protein receptor (R-SNARE) proteins VAMP3/cellubrevin and VAMP7/TI-VAMP in myelin membrane trafficking. VAMP3 and VAMP7 colocalize with the major myelin proteolipid protein (PLP) in recycling endosomes and late endosomes/lysosomes, respectively. Interference with VAMP3 or VAMP7 function using small interfering RNA-mediated silencing and exogenous expression of dominant-negative proteins diminished transport of PLP to the oligodendro…
Identification of antigenic proteins from Echinostoma caproni (Trematoda) recognized by mouse immunoglobulins M, A and G using an immunoproteomic app…
2008
Antigenic proteins of Echinostoma caproni (Trematoda) against mouse IgM, IgA, IgG, IgG1 and IgG2a were investigated by immunoproteomics. Excretory/secretory products (ESP) of E. caproni separated by two-dimensional (2D) gel electrophoresis were transferred to nitrocellulose membranes and probed with the different mouse immunoglobulin classes. A total of four proteins (enolase, 70 kDa heat-shock protein (HSP-70), actin and aldolase) were accurately identified. Enolase was recognized in eight different spots of which seven of them were detected in the expected molecular weight and were recognized by IgA, IgG or IgG and IgG1. Another spot identified as enolase at 72 kDa was only recognized by …
c-fos expression, behavioural, endocrine and autonomic responses to acute social stress in male rats after chronic restraint: modulation by serotonin
2000
The effects in male rats of serotonin depletion (using the neurotoxin 5,7-dihydroxytryptamine) on the cross-sensitization of an acute social stress (defeat by a larger resident male) by previous repeated restraint stress (10 days, 60 min per day) was studied. Previous restraint increased freezing responses during social defeat in sham-operated rats, but this was not observed in those with depleted serotonin (83% or more in different regions of the brain). In contrast, neither heart rate (tachycardia) nor core temperature responses (hyperthermia) were accentuated in previously restrained rats (i.e. neither showed heterotypical sensitization), and neither adapted to repeated restraint (there …
Recovery of immune control over herpes simplex virus type 1 in female victims of intimate partner violence.
2009
Objectives: To assess the course of immune control over Herpes simplex virus type 1 (HSV-1) through three salivary measures: neutralization of HSV-1, levels of specific antibody against HSV-1 (HSV-1-sIgA) and total immunoglobulin A (total sIgA), and to determine the factors that contribute to its recovery or deterioration. Several studies have demonstrated that intimate partner violence (IPV) affects immune responses in women, but none have investigated the impact longitudinally over time. Methods: Women (n = 60), who participated in our previous cross-sectional study (T-1) and who had been either physically/psychologically (n = 22) or psychologically abused (n = 14) by their partners, were…