IFN-λ1 in CHO cells: its expression and biological activity.

Area of Science:

• Biotechnology
• Immunology
• Molecular Biology

Background:

• Type III interferon (IFN-λ) exhibits unique biological activities distinct from Type I IFN due to receptor specificity.
• Investigating the characteristics and biological actions of Type III interferons is crucial for understanding their therapeutic potential.

Purpose of the Study:

• To establish a stable expression system for recombinant human interferon-lambda 1 (rhIFN-λ1).
• To characterize the biological activities of the produced rhIFN-λ1, including antiviral and antiproliferative effects.

Main Methods:

• Cloning of full-length rhIFN-λ1 cDNA into the pDF expression vector.
• Stable expression of rhIFN-λ1 in Flp-In-CHO cells.
• Purification of rhIFN-λ1 using multiple chromatography steps.
• Assays to determine antiviral activity (WISH-VSV), antiproliferation activity (MTS method), and natural killer cell cytotoxicity.

Main Results:

• High purity (approx. 90%) rhIFN-λ1 was obtained after purification.
• rhIFN-λ1 demonstrated potent antiviral activity (10^6 IU/mg).
• rhIFN-λ1 exhibited significantly higher anti-proliferation activity compared to rhIFN-α2b (57% increase at 1000 IU/ml) and lower NK cell cytotoxicity.

Conclusions:

• The Flp-In-CHO expression system is effective for the stable production of functional rhIFN-λ1.
• The produced rhIFN-λ1 possesses predicted antiviral, antiproliferation, and NK cell cytotoxicity-promoting activities.
• This system provides a reliable source for studying and potentially utilizing rhIFN-λ1.