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[Influence of granulocyte colony-stimulating factor on bactericidal activities of macrophages and polymorphonuclear
1Department of Urology, Jikei University, School of Medicine.
Abstract:
We investigated the influence of granulocyte colony-stimulating factor (G-CSF) on bactericidal activities of macrophages and polymorphonuclear leukocytes (PMNs) from experimental pyelonephritis in leukocytopenic rats, in order to clarify the usefulness of G-CSF for opportunistic pyelonephritis. We prepared three groups of experimental pyelonephritis, i.e., G-CSF administration group (group-1), cyclophosphamide (CPA) administration group (group-2), and CPA and G-CSF administration group (group-3). And we measured the active oxygen generation of peritoneal macrophages and PMNs in each group. On the other hand, we produced pseudomonal pyelonephritis in each group, and compared the survival rate of each group for 7 days. G-CSF enhanced active oxygen generation of peritoneal macrophages and PMNs, significantly. Furthermore, G-CSF improved the survival rate of pseudomonal pyelonephritis in leukocytopenic rats. These results indicate that G-CSF enhanced bactericidal activities of macrophages and PMNs in vivo, and prevents dissemination of infections.
Insights
Granulocyte colony-stimulating factor (G-CSF) boosts the infection-fighting capabilities of immune cells in leukocytopenic rats. This G-CSF treatment improved survival rates in bacterial pyelonephritis models.
Area of Science:
- Immunology
- Hematology
- Infectious Diseases
Context:
- Opportunistic pyelonephritis poses risks in leukocytopenic individuals.
- Leukocytopenia, often induced by chemotherapy (e.g., cyclophosphamide), impairs immune function.
- Understanding immune-modulating agents is crucial for managing infections in compromised hosts.
Purpose:
- To investigate the effect of granulocyte colony-stimulating factor (G-CSF) on the bactericidal activity of macrophages and polymorphonuclear leukocytes (PMNs).
- To evaluate the therapeutic potential of G-CSF in experimental pyelonephritis models in leukocytopenic rats.
Summary:
- Experimental pyelonephritis was induced in three groups of leukocytopenic rats: G-CSF administration, cyclophosphamide (CPA) administration, and combined CPA and G-CSF administration.
- G-CSF significantly enhanced active oxygen generation in peritoneal macrophages and PMNs.
- In a Pseudomonas-induced pyelonephritis model, G-CSF administration improved the 7-day survival rate.
Impact:
- G-CSF enhances the in vivo bactericidal activities of macrophages and PMNs.
- G-CSF demonstrates potential as a therapeutic agent to prevent the dissemination of infections in immunocompromised patients.
- These findings support the use of G-CSF in managing opportunistic infections associated with leukocytopenia.