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Meliacine, an antiviral compound from Melia azedarach L., inhibits interferon production
G M Andrei1, F C Coulombie, M C Courreges
1Department of Biochemistry, Faculty of Science, University of Buenos Aires, Argentina.
Abstract:
A glycopeptide isolated from the high plant Melia azedarach L. (meliacine) inhibits the in vitro replication of several RNA and DNA animal viruses. Interferon (IFN) production was depressed greatly in meliacine treated L929 cells and primary mouse embryo fibroblast cultures (MEF) induced with Newcastle disease virus (NDV) or poly(rI).poly(rC). This action was observed when meliacine was added before, simultaneously or early after induction with poly(rI).poly(rC) or NDV. In addition, accumulation of acid-resistant IFN was strongly diminished in adult mice treated intraperitoneally with meliacine. Though meliacine causes a strong inhibition of IFN both in vitro and in vivo, we do not know how selectively it affects the IFN system.
Insights
Meliacine, a compound from Melia azedarach, inhibits animal virus replication. It significantly reduces interferon (IFN) production in cells and mice, impacting the immune response.
Area of Science:
- Virology
- Immunology
- Natural Product Chemistry
Background:
- Melia azedarach L. is a plant source of bioactive compounds.
- Glycopeptides are known for diverse biological activities.
- Interferon (IFN) is a crucial component of the innate immune system against viral infections.
Purpose of the Study:
- To investigate the antiviral properties of meliacine, a glycopeptide from Melia azedarach.
- To determine the effect of meliacine on interferon (IFN) production in vitro and in vivo.
Main Methods:
- In vitro antiviral assays against various RNA and DNA animal viruses.
- Assessment of IFN production in L929 cells and primary mouse embryo fibroblast (MEF) cultures induced with Newcastle disease virus (NDV) or poly(rI).poly(rC).
- In vivo studies involving intraperitoneal administration of meliacine to adult mice and measurement of acid-resistant IFN accumulation.
Main Results:
- Meliacine demonstrated in vitro inhibition of replication for several RNA and DNA animal viruses.
- Meliacine significantly suppressed IFN production in cell cultures treated with NDV or poly(rI).poly(rC), regardless of treatment timing.
- In vivo administration of meliacine led to a marked decrease in acid-resistant IFN accumulation in mice.
Conclusions:
- Meliacine exhibits potent antiviral activity.
- Meliacine strongly inhibits both in vitro and in vivo interferon production.
- The precise mechanism and selectivity of meliacine's action on the interferon system require further investigation.