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Stimulatory effect of cefodizime on macrophage-mediated phagocytosis
K Oishi1, K Matsumoto, M Yamamoto
1Department of Internal Medicine, Nagasaki University, Japan.
Abstract:
We evaluated the ingestion of anti-sheep erythrocyte (anti-E) IgG- and IgM-coated sheep erythrocytes by murine peritoneal macrophages exposed to cefodizime, a new semisynthetic cephalosporin, and other antibiotics. Cefodizime enhanced the ingestion of anti-E IgG-coated erythrocytes by peritoneal macrophages from CD-1 and BALB/c mice in a dose-dependent manner, but had no effect on uncoated or IgM-coated erythrocytes. Similar enhancement was observed only in the case of cefpimizole (AC-1370), among the other antibiotics examined. These results suggest that the favorable in vivo activity of cefodizime and cefpimizole may result from their phagocytosis-enhancing as well as antimicrobial properties.
Insights
Cefodizime, a cephalosporin antibiotic, enhances the ingestion of antibody-coated sheep red blood cells by mouse macrophages. This phagocytosis-enhancing effect, also seen with cefpimizole, may contribute to their effectiveness in vivo.
Area of Science:
- Immunology
- Pharmacology
- Microbiology
Background:
- Antibiotic efficacy is crucial for treating bacterial infections.
- Phagocytosis by macrophages is a key immune defense mechanism.
- The interaction between antibiotics and immune cells is not fully understood.
Purpose of the Study:
- To investigate the effect of cefodizime on macrophage phagocytosis.
- To compare cefodizime's effect with other antibiotics.
- To explore the potential role of phagocytosis enhancement in antibiotic activity.
Main Methods:
- Murine peritoneal macrophages were exposed to cefodizime and other antibiotics.
- The ingestion of anti-sheep erythrocyte (anti-E) IgG- and IgM-coated erythrocytes was measured.
- Dose-dependent effects were analyzed in CD-1 and BALB/c mice.
Main Results:
- Cefodizime significantly enhanced the ingestion of anti-E IgG-coated erythrocytes by macrophages in a dose-dependent manner.
- No enhancement was observed for uncoated or IgM-coated erythrocytes.
- Cefpimizole (AC-1370) demonstrated similar phagocytosis-enhancing effects.
Conclusions:
- Cefodizime possesses phagocytosis-enhancing properties in addition to its antimicrobial activity.
- The observed enhancement of phagocytosis by cefodizime and cefpimizole may contribute to their favorable in vivo efficacy.
- These findings suggest a dual mechanism of action for certain cephalosporins.