Abstract
Mice were subcutaneously (sc) injected once a day for up to 15 days with a purified human native G-CSF sample at a dose of 2.5 μg/injection or with control samples with or without added endotoxin. In the G-CSF-treated mice, blood neutrophil counts began to rise as early as 2 hours after the first injection, reached a level 8 times above the preinjection level after 15 days of injections with marked elevation of all progenitor cell levels in spleen, and returned to normal within 48 hours after cessation of the injections. Such neutrophilia was observed even when endotoxin-resistant C3H HeJ mice were used, but not in control mice. It is possible that repeated G-CSF injections after administration of cyclophosphamide (CY) in mice could accelerate recovery of granulopoiesis with a rather transient rise in blood neutrophil counts.
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