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Updated: Jul 19, 2026
Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
Decreased phagocytic capacity of rat peritoneal macrophages following photon abdominal irradiation
H Salman1, M Bergman, H Bessler
1Department of Medicine C, Rabin Medical Center, Golda Campus, Petah Tiqva, Israel.
Abstract:
Photon irradiation of the abdomen may be accompanied by complications due to a decrease in the immune defense of the recipient. Since peritoneal macrophages are an important component of the immune system, we examined the phagocytic activity and oxygen superoxide anion generation by peritoneal macrophages from rats 2 and 4 weeks after abdominal irradiation with 6 MV photons applying a single dose of 2 Gy. Two and 4 weeks after irradiation, peritoneal macrophages were harvested and their capacity to engulf latex particles and to produce oxygen superoxide anions was determined. Non-irradiated rats, treated identically otherwise, served as controls. Two weeks after irradiation the phagocytic capacity and oxygen superoxide anion generation decreased by 61 and 70%, respectively, compared with controls. This tendency persisted after 4 weeks post irradiation, the decrease in both functions being 50 and 74%, respectively. It is suggested that the altered function of peritoneal macrophages following irradiation may further compromise the immune defense in patients receiving abdominal radiotherapy.
Insights
Abdominal photon irradiation significantly impairs peritoneal macrophage function, reducing phagocytic capacity and superoxide anion generation. These immune deficits persist for at least four weeks post-irradiation, potentially compromising patient recovery.
Area of Science:
- Immunology
- Radiation Biology
- Cellular Physiology
Background:
- Abdominal radiotherapy can lead to immune suppression.
- Peritoneal macrophages are crucial for innate immunity.
- Radiation-induced changes in macrophage function are not fully understood.
Purpose of the Study:
- To investigate the impact of abdominal photon irradiation on rat peritoneal macrophage phagocytic activity and oxygen superoxide anion generation.
- To assess the temporal effects of irradiation on these immune functions at 2 and 4 weeks post-exposure.
Main Methods:
- Rats were subjected to abdominal irradiation with 6 MV photons (2 Gy single dose).
- Peritoneal macrophages were harvested 2 and 4 weeks after irradiation.
- Phagocytic capacity (latex particle engulfment) and oxygen superoxide anion production were measured.
- Non-irradiated rats served as controls.
Main Results:
- Phagocytic capacity decreased by 61% at 2 weeks and 50% at 4 weeks post-irradiation.
- Oxygen superoxide anion generation decreased by 70% at 2 weeks and 74% at 4 weeks post-irradiation.
- Both functions showed significant, persistent impairment compared to controls.
Conclusions:
- Abdominal photon irradiation markedly reduces peritoneal macrophage phagocytosis and superoxide anion production.
- These functional deficits in macrophages persist for at least 4 weeks after irradiation.
- Altered macrophage function may contribute to compromised immune defense in patients undergoing abdominal radiotherapy.
