[Augmentation of activities of peripheral granulocytes and of resistance against bacterial infection after administration of G-CSF into mice].
We evaluated the metabolic capability of murine peripheral granulocytes after administration of recombinant human granulocyte colony-stimulating factor (rhG-CSF) by quantitative flow cytometric assay for H2O2-dependent oxidative product formation. Intraperitoneal administration of a daily dose of 10 micrograms of rhG-CSF for 5 days induced doubling of the leukocyte population. Differential counting of peripheral leukocytes and scattergram by flow cytometry showed an increased mature granulocyte population. After stimulation with phorbol myristate acetate, the granulocytes of the rhG-CSF-administered mice demonstrated some hyperresponsive population and an increased H2O2 production. The hyperresponsive population showed H2O2 production 4-6 times higher than did normal cells. Granulocytes from the G-CSF-treated mice revealed an augmented phagocytic activity and an increased expression of Mac-1 molecules. Moreover, mice treated with G-CSF showed an enhanced resistance against intravenous infection with a lethal dose of E. coli. Granulocytes showing such markedly increased oxidative metabolism may be a significant component of the host defence to various infective organisms.
Shinomiya
N
N
Department of Microbiology, National Defense Medical College, Saitama, Japan.
Tsuru
S
S
Katsura
Y
Y
Noritake
M
M
Kayashima
S
S
Rokutanda
M
M
D000818:Animals; D004927:Escherichia coli Infections / Q000276:immunology*; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology*; D006098:Granulocytes / Q000276:immunology* / Q000378:metabolism; D007113:Immunity, Innate; D007958:Leukocyte Count; D016177:Macrophage-1 Antigen / Q000378:metabolism; D051379:Mice; D010545:Peroxides / Q000378:metabolism; D010587:Phagocytosis
D016177:Macrophage-1 Antigen; D010545:Peroxides; D016179:Granulocyte Colony-Stimulating Factor