Activation of peritoneal macrophages by oil-attached cell-wall skeleton of BCG and Nocardia rubra
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Abstract:
The effect of oil-attached cell-wall skeletons of BCG (BCG-CWS) and Nocardia rubra (N. rubra-CWS) on macrophage functions was examined regarding phagocytosis of zymosan particles, uptake of 2-deoxy-D-glucose (2-dG), and cytostatic activity against syngeneic tumor cells. A single intraperitoneal injection of either BCG-CWS or N. rubra-CWS in mice resulted in accumulation of a large number of macrophages in the peritoneal cavity. They demonstrated, in vitro, a significant cytostatic effect on target cells as well as increase in phagocytic activity and uptake of 2-dG. These results suggest that one of underlying mechanisms for the antitumor activity of BCG-CWS and N. rubra-CWS is possibly the activated macrophage-mediated system.
Insights
Oil-attached cell-wall skeletons from BCG and Nocardia rubra activate macrophages. These activated macrophages exhibit enhanced phagocytosis and cytostatic activity, suggesting a macrophage-mediated mechanism for antitumor effects.
Area of Science:
- Immunology
- Cell Biology
- Cancer Research
Background:
- Macrophage activation is crucial for immune responses.
- Cell-wall components of bacteria can modulate immune cell functions.
- Understanding the mechanisms of BCG and Nocardia rubra is important for immunotherapy.
Purpose of the Study:
- To investigate the effects of BCG and Nocardia rubra cell-wall skeletons on macrophage functions.
- To determine if these cell-wall components enhance macrophage phagocytosis, nutrient uptake, and anti-tumor activity.
- To explore the role of activated macrophages in the anti-tumor effects of these bacterial components.
Main Methods:
- Mice were injected intraperitoneally with BCG-CWS or N. rubra-CWS.
- Macrophage accumulation in the peritoneal cavity was quantified.
- In vitro assays were performed to assess phagocytosis of zymosan particles.
- Uptake of 2-deoxy-D-glucose (2-dG) by macrophages was measured.
- Cytostatic activity against syngeneic tumor cells was evaluated.
Main Results:
- Intraperitoneal injection of BCG-CWS or N. rubra-CWS led to a significant increase in peritoneal macrophages.
- Activated macrophages demonstrated enhanced phagocytic activity.
- Uptake of 2-deoxy-D-glucose (2-dG) was increased in these macrophages.
- Macrophages exhibited significant cytostatic effects on target tumor cells in vitro.
Conclusions:
- BCG-CWS and N. rubra-CWS effectively activate macrophages.
- Activated macrophages play a key role in the observed cytostatic and phagocytic activities.
- Macrophage-mediated mechanisms are likely involved in the anti-tumor efficacy of BCG-CWS and N. rubra-CWS.