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Characterization of dog interleukin-2 activity
S Mizuno1, T Fujinaga, M Hagio
1Department of Veterinary Surgery, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
The Journal of Veterinary Medical Science
|December 1, 1993
Summary
Researchers identified dog interleukin-2 (IL-2) from canine lymphocytes, demonstrating its ability to support long-term T-cell culture and enhance anti-tumor immune responses in dogs.
Area of Science:
- Immunology
- Veterinary Science
Background:
- Interleukin-2 (IL-2) is crucial for T-cell proliferation and function.
- Canine immune system research requires specific reagents for studying T-cell responses.
Purpose of the Study:
- To characterize and identify canine interleukin-2 (IL-2).
- To evaluate the potential of dog IL-2 in supporting canine T-cell cultures and modulating immune responses.
Main Methods:
- Canine peripheral blood lymphocytes (PBL) were stimulated with phytohemagglutinin-P (PHA-P).
- Proliferative activity was assessed using murine IL-2 dependent T cells (CTLL-2).
- Dog IL-2 was characterized by its sensitivity to heat, pH changes, trypsin, and molecular weight via gel filtration.
Main Results:
- Dog IL-2 activity was detected in culture supernatants and optimized under specific conditions (2x10^6 cells/ml, 10 µg/ml PHA-P, 38°C, 48 hr).
- Dog IL-2 exhibited sensitivity to heat (65°C), pH extremes (pH 4-10), and trypsin, with a molecular weight of ~31,000 Da.
- Long-term culture of canine T-lineage lymphocytes was achieved over 10 passages using dog IL-2.
- Cultured canine PBL demonstrated enhanced cytostasis against transmissible venereal sarcoma cells after prolonged IL-2 treatment.
Conclusions:
- Canine peripheral blood lymphocytes produce IL-2 with characteristics similar to murine IL-2.
- Dog IL-2 supports the long-term culture of canine T-lymphocytes.
- Dog IL-2 can enhance the anti-tumor immune response of canine PBL, suggesting therapeutic potential.