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Partial purification and characterization of chicken interleukin-2
T J Myers1, H S Lillehoj, R H Fetterer
1United States Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705.
Veterinary Immunology and Immunopathology
|October 1, 1992
Summary
Researchers partially purified chicken interleukin 2 (IL-2) from lymphocytes. This cytokine activity was found to exist in different molecular weight forms, suggesting potential dimerization or aggregation of chicken IL-2.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Interleukin 2 (IL-2) is a critical cytokine for T cell proliferation and function.
- Understanding avian IL-2 is essential for comparative immunology and avian disease research.
Purpose of the Study:
- To partially purify and characterize chicken interleukin 2 (IL-2).
- To investigate the molecular properties of chicken IL-2, including its molecular weight and potential for aggregation.
Main Methods:
- Partial purification of IL-2 from chicken splenic lymphocytes cultured with concanavalin A.
- Sequential chromatography: gel filtration (Sephadex G100), reverse-phase HPLC, and phenyl-sepharose.
- Analysis of molecular weight using gel filtration and SDS-PAGE under reducing and non-reducing conditions.
Main Results:
- Two peaks of IL-2 activity were identified by gel filtration, with apparent molecular weights of 36-39 kD and 17.5-25 kD.
- Specific activity increased significantly during purification, from 14 U/mg to 2000-20,000 U/mg.
- Alkylative reduction of the higher molecular weight peak generated the lower molecular weight peak, indicating dimerization or aggregation.
- SDS-PAGE confirmed a molecular weight of approximately 20 kD for chicken IL-2.
Conclusions:
- Chicken IL-2 exhibits heterogeneity in molecular weight, likely due to dimerization or aggregation.
- The monomeric form of chicken IL-2 appears to be around 20 kD.
- These findings provide insights into the biochemical properties of avian IL-2.