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Query: UMLS:C0038362 (stomatitis)
 8,852 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Previous studies in our laboratory have demonstrated that the development of antiviral activity of human leukocyte interferon (IF) in nasal epithelial cells is time and concentration dependent and that the loss of intranasally applied human leukocyte IF is rapid. The present studies compared the activity of IF applied intranasally either by nasal drops or by a saturated cotton pledget. Adult volunteers had IF applied to an area of nasal mucosa (2 by 2 cm(2)) either by repeated nose drops or by a saturated cotton pledget that was applied to the nasal mucosa and left in place for 1 h. Nasal epithelial cells scraped from the area of application, as well as the control, untreated side of the same volunteers, were challenged with vesicular stomatitis virus. No significant reduction in mean virus yield was found in volunteers who received 80,000 U by nose drops. Significant reduction (P < 0.025) in mean virus yield was found in cells obtained 4 h after 80,000, 50,000, or 20,000 U was applied by cotton pledget or in volunteers pretreated with oral antihistamines prior to receiving 80,000 U by nose drops. These experiments indicate that nasal epithelial cells can be made antiviral in vivo by application of human leukocyte IF. However, practical usefulness of human leukocyte IF for prophylaxis against respiratory viral infections may depend on the method of local application.
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PMID:Antiviral activity of intranasally applied human leukocyte interferon. 21 28

Human FS-4 cells were exposed to human fibroblast interferon for various times and further incubated in the absence of interferon until challenged with vesicular stomatitis virus. Addition of antibody to fibroblast interferon at the time of removal of interferon did not alter the development of the antiviral state. If cells were exposed to interferon for 45 min at either 0 or 37 degrees C, they developed resistance upon subsequent incubation at 37 degrees C. However, less resistance developed if the cells were initially incubated at 0 degrees C. Our results indicate that a single interaction of fibroblast interferon with susceptible cells, either at 0 or 37 degrees C, is sufficient for the subsequent development of an antiviral state, at least in the short term experiment. The kinetics of development of the antiviral state were compared with fibroblast and leukocyte interferon. The rise in the degree of antiviral resistance was steeper and maximal levels of resistance were reached sooner when FS-4 cells were incubated with increasing concentrations of fibroblast interferon than with leukocyte interferon. This suggests a greater affinity of fibroblast interferon for these cells.
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PMID:Initial interaction of human fibroblast and leukocyte interferons with FS-4 fibroblasts. 22 87

In vitro production of interferon by blood leukocytes from patients with lymphosarcoma, lymphogranulomatosis, leukemia, cancer tumours, pneumonia, as well as by leukocytes of mice with Rauscher leukemia, and mice in the condition of hyporeactivity to interferon inducer was studied. Alongside with quantitative differences in interferon production, biological differences in the properties of interferons produced of normal and sick humans and animals were revealed. The biological differences consist in that the interferon produced by leukocytes from cancer and leukemia patients interacting with homologous cell culture is conducive to more rapid formation of resistance to the indicator virus than the interferon produced by normal leukocytes. Thus, resistance of the homologous cell culture to the infection with the indicator vesicular stomatitis virus developed within 1--2 hours after contact with leukocyte interferon from patients and only within 5--6 hours after contact with that of normal subjects. This finding is not specific for cancer and leukemia, as the same was observed with specimens from patients with pneumonia and from mice hyporeactive to interferon inducer. It is suggested that patients with cancer and leukemia have a state of interferon hyporeactivity.
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PMID:[Differences in the properties of the interferons produced by the leukocytes of healthy persons and of cancer and leukemia patients]. 50 7

The phenomenon that rHuIFN-alpha1(D) displays an apparently higher antiviral activity when assayed on bovine cells as compared to human cell lines was applied to the elucidation of the nature of recombinant HuIFN prepared in our institute. These investigations were carried out by using a microtitre test, which defines biological activity as the IFN concentration leading to 50% inhibition of the cytopathic effect of vesicular stomatitis virus (VSV). In addition, the ability of IFN to diminish the reproduction of infectious viruses was monitored. The two methods yielded similar results. With bovine cells, antiviral activities of the same order of magnitude were observed, regardless of the interferon types applied, i.e. rHuIFN-alpha 1, rHuIFN-alpha 2 and human leukocyte interferon. On human fibroblasts, however, rHuIFN-alpha 1 had an apparently 45 to 165 times lower activity than the other two interferons. On human WISH cells, the differences in apparent activity between the respective IFNs were even greater, with factors of up to 212 fold being observed. Still more distinctive were the effects on murine L 929 cells where an antiviral effect could be confirmed only for rHuIFN-alpha 1 whereas the other two interferons proved completely inactive.
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PMID:[Sensitivity of different cell lines to interferons: the relative antiviral activity as a function of the interferon subtype]. 255 62

The influence of cimetidine on antiviral activity of leukocyte interferon (IFN-alpha (Le] was studied in plaque-reduction assays using Utrecht (U) amnion cells challenged with vesicular stomatitis virus (VSV) and in CPE inhibition assays using A549 cells challenged with encephalomyocarditis (EMC) virus and WISH cells challenged with VSV. The IFN-alpha (Le)-induced antiviral activity was slightly enhanced in cells treated with cimetidine, whereas cimetidine treatment alone did not show any antiviral effect. The observed titer (OT) was significantly higher (p less than 0.05) in cells treated with cimetidine together with IFN-alpha (Le) compared with the control without cimetidine. The effect of cimetidine on IFN-alpha (Le)-induced cell growth inhibition was studied on Daudi (a Burkitt's lymphoma cell line) and on G361 (a melanoma cell line) cells. The growth of these cells was slightly suppressed by cimetidine alone. When cells were treated with IFN-alpha (Le)/cimetidine, the cell growth inhibition rates were significantly higher (p less than 0.02) than the rates obtained with IFN-alpha (Le) or cimetidine alone. These results indicate that cimetidine can enhance the antiviral as well as the antiproliferative activities of IFN-alpha (Le) in "in vitro" studies.
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PMID:Antiviral and antiproliferative activities of human leukocyte interferon potentiated by cimetidine in vitro. 299 35

The sensitivities to human leukocyte interferon of 10 strains of Herpes simplex virus (HSV) type 1 and 3 strains of type 2 were compared. All the strains were sensitive to interferon, although their sensitivities were less than that of vesicular stomatitis virus (VSV). There was no significant difference in the sensitivities to interferon of HSV type 1 and type-2 or among different strains of a given type of HSV. Nor was there any difference between the sensitivities of 5-iodo-2'-deoxyuridine (IDU)-sensitive and resistant strains isolated from the same patients. These results suggest that interferon should be useful in therapy of HSV infection.
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PMID:Comparative studies on the inhibitory effects of interferon on various strains of herpes simplex viruses in vitro. 616 4

A fraction of the viral mRNA synthesized in interferon-treated HeLa cells infected with vesicular stomatitis virus (VSV) lacks the 7-methyl group in the 5'-terminal guanosine of the cap; this mRNA is not associated with polyribosomes and does not bind to ribosomes in an assay for initiation of protein synthesis (de Ferra, F., and Baglioni, C. (1981) Virology 112, 426-435). To establish whether this defect in methylation is due to changes in the level of the methyl donor S-adenosylmethionine (AdoMet) and of its competitive inhibitor S-adenosylhomocysteine (AdoHcy), we measured the concentration of these compounds in HeLa cells treated with interferon. An increase in both AdoMet and AdoHcy was detected 3 to 6 h after addition of interferon. The level of these compounds increased gradually and in proportion to the interferon concentration used. With 125 reference units/ml of beta interferon, for example, the AdoHcy concentration increased more than 3-fold and that of AdoMet about 1.5-fold with a consequent change in the AdoHcy/AdoMet ratio. An increased AdoHcy/AdoMet ratio was also found in HeLa cells treated with pure alpha 2 interferon produced in Escherichia coli by recombinant DNA techniques. When the methylation of VSV mRNA was measured in assays carried out with permeabilized virions at the AdoHcy and AdoMet concentrations found in interferon-treated cells, a preferential inhibition of the viral (guanine-7-)methyltransferase activity was observed. Such an inhibition may account for the synthesis of VSV mRNA lacking the 7-methyl group of guanosine in the cap.
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PMID:Increase in S-adenosylhomocysteine concentration in interferon-treated HeLa cells and inhibition of methylation of vesicular stomatitis virus mRNA. 618 92

The antiviral activities of recombinant human leukocyte interferons IFN-alpha A and IFN-alpha D as well as five hybrids of these interferons against retroviruses, vesicular stomatitis virus, and encephalomyocarditis virus were studied in feline, human, and murine cells. Although these interferon species had widely different potencies, their activities against these viruses were, in general, proportional. The IFN-alpha A/D (Bgl) hybrid was the most potent species, and the IFN-alpha D/A (Bgl) hybrid was the least potent. However, the latter species did not interfere with the action of the former species. Like natural human leukocyte interferon, each of the seven species of recombinant interferons induced the synthesis of at least five proteins in human fibroblasts, whereas induction of only one such protein was readily detected in a feline fibroblast line in which these interferon species inhibited the replication of all three viruses.
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PMID:Antiviral and protein-inducing activities of recombinant human leukocyte interferons and their hybrids. 620 Jun 7

A sensitive enzyme immunoassay (EIA) for determining the biological activity of human interferon was developed. Green monkey kidney (Vero) cells and human embryonic lung (HEL) cells were grown in microtitre plates, treated with leukocyte interferon (IFN alpha) and infected with vesicular stomatitis virus (VSV). Cells were fixed with paraformaldehyde and permeabilized with Triton X-100. Viral antigen synthesis was measured by labelling the cells with VSV antiserum followed sequentially by protein A horseradish peroxidase conjugate and o-phenylenediamine. Interferon activity was detected as a lowering of the absorbance value from that of the virus control wells, reflecting the inhibition of virus protein synthesis by interferon. The minimum amount of interferon producing statistically significant (P less than 0.01) decrease of absorbance in Vero cells was 1-5 international units (I.U.)/ml as in the standard plaque reduction test the detection limit was 7.5 I.U./ml or more. In HEL cells the detection limit was 1 I.U./ml measured by EIA. The EIA for interferon activity is at least as sensitive as the traditional plaque reduction test. It is reproducible, easy to automatise and requires 7-10 times less cell culture materials than the plaque reduction test. We find it preferential especially when large numbers of specimens with limited volumes are to be analysed for interferon activity.
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PMID:Sensitive interferon assay based on immunoenzymatic quantification of viral antigen synthesis. 629 74

Four hybrid human leukocyte interferon (IFN-alpha) genes have been constructed and expressed in Escherichia coli using molecular cloning methods. Plasmids containing genes encoding human interferons, IFN-alpha A, IFN-alpha D, IFN-alpha I and several hybrids of the different IFN-alpha genes (formed by in vitro recombination at common restriction endonuclease sites located within the DNA sequence encoding mature polypeptides) joined identically to an E. coli trp promoter gave rise to bacterial-produced interferons with distinctly different antiviral activities. The expression plasmid which directs the synthesis of IFN-alpha I was constructed using a gene isolated from a human genomic library in a manner similar to the previous expression of IFN-alpha A and IFN-alpha D cDNA clones. The use of a cell-free transcription-translation system has allowed the calculation of the specific activities of IFN-alpha made from isolated DNA fragments containing these hybrid IFN-alpha genes. These bacterially-derived interferons vary considerably in their ability to inhibit vesicular stomatitis virus (VSV) in different mammalian cells. The results show that the cloned hybrid interferons have unique antiviral activities when compared with the parent interferons, and they demonstrate that more active IFN-alpha s can be made using recombinant DNA techniques.
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PMID:Carboxyterminal region of hybrid leukocyte interferons affects antiviral specificity. 630 84


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