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Inhibition of growth of Toxoplasma gondii in cultured fibroblasts by human recombinant gamma interferon.
- Source :
-
Infection and immunity [Infect Immun] 1984 May; Vol. 44 (2), pp. 211-6. - Publication Year :
- 1984
-
Abstract
- The growth of Toxoplasma gondii in cultured human fibroblasts was inhibited by recombinant human gamma interferon at concentrations of 8 to 16 U/ml. The interferon was titrated by observing a total inhibition of parasite plaque formation 7 days after infection. Inhibition of the growth of T. gondii in the early days after infection was measured by marked reductions in the incorporation of radioactive uracil, a precursor that can only be used by the parasites. This assay showed that when cells were pretreated with gamma interferon for 1 day and then infected, inhibition of T. gondii growth could be readily detected 1 or 2 days after infection. When the pretreatment was omitted and parasites and gamma interferon were added at the same time, no inhibition of parasite growth could be detected 1 day later, although it was apparent after 2 days. Cultures from which the gamma interferon had been removed by washing after a 1-day treatment showed inhibition of T. gondii growth. Gamma interferon had no effect on the viability of extracellular parasites, but it did inhibit the synthesis of host cell RNA and protein by ca. 50% 3 days after treatment. This degree of inhibition is unlikely, of itself, to compromise the growth of T. gondii. Recombinant alpha and beta interferons had no effect on the growth of T. gondii.
- Subjects :
- Animals
Cells, Cultured
DNA Replication drug effects
Dose-Response Relationship, Drug
Fibroblasts physiology
Humans
Interferon-gamma genetics
Kinetics
Protein Biosynthesis drug effects
Toxoplasma drug effects
Transcription, Genetic drug effects
Interferon-gamma toxicity
Toxoplasma growth & development
Subjects
Details
- Language :
- English
- ISSN :
- 0019-9567
- Volume :
- 44
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Infection and immunity
- Publication Type :
- Academic Journal
- Accession number :
- 6425215
- Full Text :
- https://doi.org/10.1128/iai.44.2.211-216.1984