19 research outputs found
Protection of Hepatocytes from Cytotoxic T Cell Mediated Killing by Interferon-Alpha
<p>Background: Cellular immunity plays a key role in determining the outcome of hepatitis C virus (HCV) infection, although the majority of infections become persistent. The mechanisms behind persistence are still not clear; however, the primary site of infection, the liver, may be critical. We investigated the ability of CD8+ T-cells (CTL) to recognise and kill hepatocytes under cytokine stimulation.</p>
<p>Methods/Principle Findings: Resting hepatocytes cell lines expressed low levels of MHC Class I, but remained susceptible to CTL cytotoxicity. IFN-α treatment, in vitro, markedly increased hepatocyte MHC Class I expression, however, reduced sensitivity to CTL cytotoxicity. IFN-α stimulated hepatocyte lines were still able to present antigen and induce IFN-γ expression in interacting CTL. Resistance to killing was not due to the inhibition of the FASL/FAS- pathway, as stimulated hepatocytes were still susceptible to FAS-mediated apoptosis. In vitro stimulation with IFN-α, or the introduction of a subgenomic HCV replicon into the HepG2 line, upregulated the expression of the granzyme-B inhibitor–proteinase inhibitor 9 (PI-9). PI-9 expression was also observed in liver tissue biopsies from patients with chronic HCV infection.</p>
<p>Conclusion/Significance: IFN-α induces resistance in hepatocytes to perforin/granzyme mediate CTL killing pathways. One possible mechanism could be through the expression of the PI-9. Hindrance of CTL cytotoxicity could contribute to the chronicity of hepatic viral infections.</p>
The role of TNF-TNFR2 interactions in generation of CTL responses and clearance of hepatic adenovirus infection
The role of subjectivity category in understanding the comunity context and the transforming intervention
Optimization of the molecular sieving properties of amorphous SiCXNY:H hydrogen selective membranes prepared by PECVD
In this work, low frequency PECVD a-SiCxNy:H thin films have been synthesized in the temperature range 25–300 ∘C from hexamethyldisilazane precursor mixed with ammonia at various concentrations. A relevant correlation has been evidenced between the [N]/[C] atomic ratio in the gaseous phase and in the deposited thin films, allowing both prediction and control of the film microstructure. A simple method based on the analysis of the films FTIR spectra was proposed to determine the value of the [N]/[C] ratio and thus predict or adjust the gas transport properties of the membrane materials. Attractive ideal selectivities α*He/N2 exceeding 90 with He permeance ΠHe > 3.10−7 mol.s−1.m−2.Pa−1 were measured at 150 ∘C for the films prepared at 300 ∘C with an optimum [N]/[C] atomic ratio in the range 0.1–1.5. These films behave as molecular sieve membranes with a thermally activated transport of helium