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Comparative evaluation of multiple lymphoid and recombinant human interleukin-2 preparations
Journal of Biological Response Modifiers
|February 1, 1986
Summary
This study compared natural and recombinant interleukin-2 (IL-2) preparations, finding significant variability in potency and purity. Natural IL-2 showed unique B cell growth factor activity, while both types exhibited diverse effects on immune cells and in vivo responses.
Area of Science:
- Immunology
- Biotechnology
Background:
- Interleukin-2 (IL-2) is crucial for T cell proliferation and immune responses.
- Variability in natural (nIL-2) and recombinant (rIL-2) preparations can impact therapeutic efficacy.
- Standardized evaluation of IL-2 potency and purity is essential for research and clinical applications.
Purpose of the Study:
- To comparatively evaluate the potency and functional activities of natural and recombinant human IL-2 preparations.
- To identify differences in cytokine profiles, contaminants, and immune cell modulation between nIL-2 and rIL-2.
- To assess the in vitro and in vivo efficacy of various IL-2 preparations in murine models.
Main Methods:
- Standardized IL-2 activity assignment using T cell growth assays against a reference reagent.
- Assays for endotoxin and interferon (IFN) activity.
- Evaluation of natural killer (NK) cell activity augmentation.
- Assessment of peripheral blood mononuclear cell (PBMC) gamma IFN production and B cell growth factor activity.
- Monocyte functional assays and in vitro/in vivo murine immune response studies.
Main Results:
- Significant variability in IL-2 potency (110-fold less to 38.5-fold more) compared to supplier unitage.
- Presence of endotoxin in two nIL-2 and two rIL-2 preparations.
- Differential cytokine activities: nIL-2s showed B cell growth factor activity, while some contained IFN.
- All IL-2s augmented NK activity, but required RU varied; nIL-2s and some rIL-2s induced PBMC gamma IFN production.
- Both nIL-2 and rIL-2 modulated monocyte functions and enhanced murine immune responses, with quantitative differences observed.
Conclusions:
- Natural and recombinant IL-2 preparations exhibit significant heterogeneity in potency, purity, and biological activity.
- Natural IL-2 possesses unique B cell growth factor activity not consistently found in recombinant forms.
- Variations in IL-2 preparations necessitate careful characterization for reliable application in immunological research and therapy.