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Published on: July 11, 2015
Bovine interleukin 2: biochemical and biological characterization
B Arunachalam1, M V Subba Rao, G C Ram
1Immunology Section, Indian Veterinary Research Institute, Izatnagar.
Insights
Researchers purified and characterized bovine Interleukin 2 (IL-2), a key immune signaling molecule. They found that IL-2 supports lymphocyte proliferation and exhibits cross-species reactivity with buffalo and goat immune cells.
Area of Science:
- Immunology
- Biochemistry
- Veterinary Science
Background:
- Interleukin 2 (IL-2) is a critical cytokine for lymphocyte proliferation and immune response.
- Understanding bovine IL-2 is essential for advancing cattle immunology and disease resistance research.
Purpose of the Study:
- To purify and characterize bovine Interleukin 2 (IL-2) secreted by peripheral blood mononuclear cells (PBL).
- To assess the biological activity and cross-species reactivity of purified bovine IL-2.
Main Methods:
- Purification of IL-2 using chromatographic techniques (gel-filtration, anion exchange, phenyl-Sepharose).
- Electrophoretic techniques for characterization.
- Assay of IL-2 activity based on proliferation of Concanavalin A (Con A)-stimulated bovine lymphoblasts.
Main Results:
- Bovine IL-2 has an apparent molecular weight of 27,000 Da and is hydrophobic.
- Peak activity was detected at 190 mM NaCl from anion exchange chromatography.
- Buffalo and goat lymphocytes showed significant response to cattle IL-2, indicating cross-species reactivity.
Conclusions:
- Bovine IL-2 was successfully purified and characterized, revealing its molecular and biochemical properties.
- Cattle IL-2 demonstrates functional cross-reactivity with lymphocytes from related species like buffalo and goats.
- This research provides a foundation for utilizing IL-2 in veterinary immunology and therapeutic applications.
Abstract:
Interleukin 2 (IL-2), secreted by bovine peripheral blood mononuclear cells (PBL) on stimulation with concanavalin A (Con A), was purified and characterized by different chromatographic and electrophoretic techniques. The ability of IL-2 to support proliferation of Con A-stimulated bovine lymphoblasts was used to assay and quantitate IL-2 activity. Bovine IL-2 having an apparent MW of 27,000 eluted from a gel-filtration column; from an anion exchange column peak activity was detected at 190 mM NaCl. Binding of bovine IL-2 to phenyl-Sepharose gel and elution with 35-60% ethanediol indicated its hydrophobic nature. Studies on cross-species reactivity revealed that both buffalo and goat lymphocytes respond to cattle IL-2 and detected 35% of activity from a standard cattle IL-2 preparation. Sheep lymphocyte response to cattle IL-2 was negligible.
