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Generation of rat eosinophils by recombinant rat interleukin-5 in vitro and in vivo
1Department of Pathophysiological Biochemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba Aramaki, Aoba-ku, Sendai, Miyagi, Japan.
Abstract:
The addition of recombinant rat interleukin-5 (IL-5), which was purified from the hemolymph of silkworm Bombyx mori larvae infected with IL-5-expressing recombinant virus, to cultures of rat bone marrow cells resulted in an increase in the number of Luxol-fast-blue staining eosinophils in a time- and concentration-dependent manner. After 6 days culture with 100 pM recombinant rat IL-5, more than 90% of the bone marrow cells were eosinophil. The contents of major basic protein (MBP) in the bone marrow cells determined by Western blot analysis using a polyclonal antibody to rat MBP were also increased by recombinant rat IL-5 (100 pM). Furthermore, intravenous injections of recombinant rat IL-5 twice a day for six consecutive days increased the population of eosinophils in peripheral blood cells and in bone marrow cells. These findings indicate that rat IL-5 induces terminal differentiation and proliferation of progenitor cells to mature eosinophils in rats.
Insights
Recombinant rat interleukin-5 (IL-5) promotes the development of eosinophils from bone marrow cells in rats. This cytokine treatment significantly increases eosinophil numbers and major basic protein content, indicating its role in eosinophil differentiation and proliferation.
Area of Science:
- Immunology
- Hematology
Background:
- Interleukin-5 (IL-5) is a cytokine crucial for the development and function of eosinophils.
- Understanding the specific effects of recombinant rat IL-5 on hematopoiesis is important for immunological research.
Purpose of the Study:
- To investigate the effects of recombinant rat interleukin-5 (IL-5) on the differentiation and proliferation of eosinophils in rat bone marrow cells.
- To determine the impact of IL-5 on the maturation of progenitor cells into mature eosinophils.
Main Methods:
- Culturing rat bone marrow cells with purified recombinant rat IL-5.
- Quantifying eosinophil numbers using Luxol-fast-blue staining.
- Assessing major basic protein (MBP) content via Western blot analysis.
- Administering IL-5 intravenously to rats and analyzing peripheral blood and bone marrow cell populations.
Main Results:
- Recombinant rat IL-5 significantly increased the number of eosinophils in bone marrow cell cultures in a time- and concentration-dependent manner.
- Treatment with 100 pM recombinant rat IL-5 for 6 days resulted in over 90% eosinophils in bone marrow cultures.
- IL-5 treatment led to increased major basic protein (MBP) content in bone marrow cells.
- Intravenous IL-5 injections increased eosinophil populations in peripheral blood and bone marrow.
Conclusions:
- Recombinant rat IL-5 effectively induces the terminal differentiation and proliferation of progenitor cells into mature eosinophils in rats.
- IL-5 plays a critical role in regulating eosinophil hematopoiesis.