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Toxic action of etoposide on mouse peritoneal macrophages and its modulation by interleukin 3
Gemma Olmos1, L Alfredo Lotero, Angel Herráez
1Departamento de Bioquímica y Biología Molecular, Campus Universitario, Universidad de Alcalá, Madrid, Spain.
Abstract:
In the present work, we have studied the toxic action of etoposide on mouse peritoneal macrophages. First, we have determined the induction of DNA fragmentation by this antitumour compound. To study the possible influence of interleukin 3 on the effects of etoposide on mouse macrophages, we studied intracellular protein phosphorylation induced by interleukin 3. After incubation of the cells in the presence of interleukin 3, increased phosphorylation levels of proteins of estimated molecular weights of around 29,000, 34,000, 50,000 and 61,000 daltons were observed. We have also investigated a possible influence of interleukin 3 on DNA degradation induced by etoposide. The changes of Bax levels induced by etoposide that we have observed seemed to be modulated by this cytokine. From these results, a possible role of interleukin 3 can be suggested in the attenuation of some toxic effects produced by etoposide in mouse peritoneal macrophages. Thus, a therapeutic application of interleukin 3 on antitumour treatments in cells from the mononuclear phagocytic system might be proposed.
Insights
Interleukin 3 (IL-3) may reduce etoposide toxicity in mouse macrophages by modulating DNA damage and protein phosphorylation. This suggests IL-3 could be a therapeutic agent in anticancer treatments.
Area of Science:
- Immunology
- Pharmacology
- Molecular Biology
Background:
- Etoposide is an antitumour drug known to induce DNA fragmentation.
- Macrophages are key immune cells involved in the response to anticancer agents.
- Interleukin 3 (IL-3) is a cytokine that regulates the growth and differentiation of myeloid cells, including macrophages.
Purpose of the Study:
- To investigate the toxic effects of etoposide on mouse peritoneal macrophages.
- To determine the influence of IL-3 on etoposide-induced toxicity.
- To explore the potential of IL-3 as a protective agent against etoposide-induced damage.
Main Methods:
- Mouse peritoneal macrophages were treated with etoposide.
- DNA fragmentation was assessed to measure etoposide-induced toxicity.
- Intracellular protein phosphorylation was analyzed after IL-3 stimulation.
- Changes in Bax protein levels were examined in response to etoposide and IL-3.
Main Results:
- Etoposide induced DNA fragmentation in macrophages.
- IL-3 treatment led to increased phosphorylation of proteins (29, 40, 50, 61 kDa).
- IL-3 modulated etoposide-induced changes in Bax levels.
- IL-3 appeared to attenuate some toxic effects of etoposide.
Conclusions:
- Interleukin 3 may play a protective role against etoposide toxicity in mouse peritoneal macrophages.
- IL-3's effects involve modulation of DNA damage and protein phosphorylation.
- IL-3 could be a potential therapeutic agent to mitigate side effects of etoposide in mononuclear phagocytic system cells during anticancer therapy.
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