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Effect of tumor cell conditioned media on secretion of TNF-alpha by macrophages
K Tsuru1, K Akimoto, K Sorimachi
1Department of Ophthalmology, Dokkyo University School of Medicine, Tochigi, Japan.
Abstract:
Conditioned medium obtained from rat liver (M cells) induced a greater than 3 fold increase in the proliferation of rat bone marrow macrophages. Non-specific esterase staining of the proliferated cells gave a positive result. The conditioned media obtained from 8 other established cell lines and 2 primary human cell cultures were also examined for their effects on cultured macrophages. All of the conditioned media tested increased macrophage proliferation. In addition, the conditioned media were examined to determine whether they induced TNF-alpha production in macrophages. TNF-alpha was not detected in the culture medium of the macrophages in the absence of conditioned medium derived from other cell cultures, but TNF-alpha production could be induced by the addition of these conditioned media. Conditioned media obtained from the cells of different species or tumor cell lines were more effective in inducing TNF-alpha production than those obtained from rat cell lines or normal tissue cell lines.
Insights
Rat liver conditioned medium significantly boosts macrophage proliferation and stimulates tumor necrosis factor-alpha (TNF-alpha) production. Other cell culture media also enhance macrophage activity and TNF-alpha release.
Area of Science:
- Cell Biology
- Immunology
Background:
- Macrophages are crucial immune cells involved in host defense and tissue repair.
- Tumor necrosis factor-alpha (TNF-alpha) is a key cytokine in inflammation and immune responses.
Purpose of the Study:
- To investigate the effect of conditioned media from various cell lines on macrophage proliferation.
- To determine the capacity of these conditioned media to induce TNF-alpha production in macrophages.
Main Methods:
- Cultured rat bone marrow macrophages were treated with conditioned medium from rat liver (M cells) and other cell lines.
- Macrophage proliferation was assessed, and non-specific esterase staining was performed.
- TNF-alpha production was measured in macrophage cultures exposed to different conditioned media.
Main Results:
- Conditioned medium from rat liver cells increased macrophage proliferation over 3-fold.
- All tested conditioned media, including those from 8 cell lines and 2 primary human cultures, enhanced macrophage proliferation.
- Conditioned media induced TNF-alpha production in macrophages, with media from different species or tumor cell lines being more potent.
Conclusions:
- Conditioned media from various cell sources can stimulate macrophage proliferation.
- These conditioned media are capable of inducing TNF-alpha production by macrophages.
- Tumor cell lines and cells from different species may be particularly effective in stimulating macrophage-derived TNF-alpha.