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High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

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Published on: March 24, 2015

From Genetic Engineering to Preclinical Safety: A Study on Recombinant Human Interferons.

Thelvia I Ramos¹, Carlos A Villacis-Aguirre², Emilio Lamazares²

¹Grupo de Investigación en Sanidad Animal y Humana (GISAH), Departamento de Ciencias de la Vida y la Agricultura, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador.

International Journal of Molecular Sciences

|December 30, 2025

Summary

This study evaluated native recombinant human interferons (rhIFNα-2b and rhIFN-γ), finding them stable and safe. Preclinical data show no toxicity, supporting their clinical development and new delivery methods like intranasal administration.

Keywords:

animal model antiproliferative antiviral bioactivity immunomodulatory interferon alpha interferon gamma preclinical recombinant toxicity

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Area of Science:

Biopharmaceutical Development
Immunology
Drug Safety

Background:

Preclinical research on native recombinant human interferons (rhIFNα-2b and rhIFN-γ) is limited, focusing instead on modified variants.
Understanding the properties of native interferons is crucial for accurate preclinical assessment.

Purpose of the Study:

To comprehensively evaluate the structural stability and intrinsic toxicity of purified native rhIFNα-2b and rhIFN-γ.
To establish a reproducible preclinical model for interferon evaluation.
To support the safe transition of interferons to clinical trials.

Main Methods:

Structural stability assessments under controlled conditions.
Accelerated stability assays at various temperatures.
Acute and sub-chronic toxicity studies in multiple animal models (rodent, non-rodent, higher organisms).
Pyrogen testing.

Main Results:

Both rhIFNα-2b and rhIFN-γ retained bioactivity (antiviral, antiproliferative, immunomodulatory).
Proteins showed remarkable stability, with no loss of potency after 18 days in accelerated assays.
No toxicity observed in animal models at doses 100-300 times higher than therapeutic levels.
Assays confirmed the absence of pyrogens, indicating a favorable safety profile.

Conclusions:

Purified native interferons exhibit significant stability and a favorable safety profile.
The findings support the potential for liquid formulations and alternative administration routes, such as intranasal.
Early characterization of API safety is vital for successful clinical translation.