[Tumor necrosis factor in medicinal interferon preparations].

Area of Science:

• Immunology
• Virology
• Biochemistry

Background:

• Interferons (IFNs) are crucial cytokines in antiviral defense.
• Tumor Necrosis Factor (TNF) is a pro-inflammatory cytokine with diverse biological activities.
• The interplay between IFN and TNF production in response to viral stimuli requires further elucidation.

Purpose of the Study:

• To investigate the production of TNF by leukocytes stimulated with viruses in the presence of IFN-alpha.
• To characterize the kinetics and regulatory mechanisms of TNF and IFN-alpha biosynthesis.
• To determine the presence of TNF in various IFN preparations.

Main Methods:

• Leukocyte cultures were induced with viruses in the presence of IFN-alpha.
• Kinetics of TNF and IFN-alpha production were monitored over time.
• Antibodies against IFN-alpha and TNF were used to assess their roles in biosynthesis.
• Commercial IFN preparations (native, recombinant, and chemically purified) were analyzed for TNF content.

Main Results:

• Virus induction of leukocyte cultures with IFN-alpha resulted in rapid TNF production within 7-8 hours.
• TNF and IFN-alpha biosynthesis kinetics were independent of the type of IFN used for priming.
• Antibodies to IFN-alpha did not inhibit TNF production, and anti-TNF antibodies did not reduce IFN-alpha yields.
• Detectable TNF was found in native IFN-alpha preparations but absent in recombinant and chemically purified IFN preparations.

Conclusions:

• Leukocytes stimulated by viruses in conjunction with IFN-alpha efficiently produce TNF.
• TNF and IFN-alpha biosynthesis are distinct processes with rapid kinetics, not significantly influenced by each other's presence or antibodies.
• The presence of TNF in native IFN preparations highlights potential variability and warrants consideration in therapeutic applications.