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At least 1,333 records · Page 74Linked to original sources
PubMed1985

Teleocidin, a tumour promoter, stimulates synthesis of primate retroviruses in persistently infected human cells.

The naturally occurring tumour promoter teleocidin produces a pronounced but transient enhancement of the synthesis of extracellular viral particles in human cells chronically infected with simian retroviruses of type C (baboon endogenous virus, simian sarcoma virus) or type D (Mason-Pfizer monkey virus) or a human cell line-derived type D isolate (PMF virus), respectively. The retrovirus-stimulating activity of teleocidin is very similar to that previously described for the tumour-promoting phorbol ester TPA in the same cell systems.

Carcinogens↗
PubMed1989

The effect of interferon on cells persistently infected with HIV.

In this study the effect of interferon (IFN) on uninfected cells (H9-) and cells infected (H9+) with HIV-1 was investigated. In both H9- and H9+, IFN was unable to inhibit Sindbis virus replication. HIV-1 replication was inhibited by a maximum of 22% at 1000 U/ml of IFN. In both H9- and H9+ cells IFN exhibited a limited antiproliferative effect. There was activation of the 2'-5' oligo-A-synthetase (E enzyme) and the protein kinase enzyme systems, but low activation of the ribonuclease F was seen in both H9- and H9+ cells. From these results it can be concluded that IFN produces a limited antiviral and antiproliferative effect in both H9- and H9+ cells, and a defective ribonuclease F pathway might be responsible for this limited activity.

Cell Line↗
PubMed1985

Suppressor activity of bovine Fc gamma positive cells during a persistent infection with Mycobacterium avium.

The cell mediated immune response (CMI) was measured in calves after experimental infection with Mycobacterium avium. Using the tuberculin skin test a CMI response could be measured from four to 14 weeks after infection, and with a lymphocyte stimulation (LS) test from six to 40 weeks. One year after infection no CMI response was detected by either of the tests, in spite of the fact that in such calves M avium bacteria could be found in the intestinal lymph nodes at autopsy. After removal of mononuclear cells bearing receptors for the Fc part of IgG, the peripheral blood lymphocytes obtained from a calf infected one year earlier responded to M avium pure protein derivative in the LS test in contrast to lymphocytes obtained from uninfected calves.

Animals↗