Immunomodulatory effects of moxifloxacin in comparison to ciprofloxacin and G-CSF in a murine model of cyclophosphamide-induced leukopenia

Itamar Shalit, Yehudith Kletter, Drora Halperin, Dalia Waldman, Elad Vasserman, Arnon Nagler, Ina Fabian*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We analyzed the effect of the two quinolones moxifloxacin and ciprofloxacin on the repopulation of hematopoietic organs and on the production of cytokines by various organs of cyclophosphamide (CP)-induced leukopenic mice. The effect was compared to that of G-CSF. Cyclophosphamide injection induced a severe leukopenia, with nadir at day 4 post-injection. All the quinolone and G-CSF-treated animals showed WBC > 500/μL at the nadir, compared to 50% of saline-treated mice. Cyclophosphamide induced a marked decrease in the number of myeloid progenitors (CFU-C) in bone marrow (BM) and spleen. Quinolone or G-CSF treatment resulted in a 1.4-4.3-fold increase in CFU-C numbers in the BM; no enhancement was observed in the spleen. Treatment with CP resulted in enhanced colony-stimulating activity (CSA) in bone shaft and spleen and decreased activity in bladder and lung. Treatment of CP-injected mice with quinolones significantly enhanced CSA in the bone shaft, spleen, lung and bladder on different days. In normal mice the highest levels of GM-CSF and IL-6 were observed in lung-conditioned medium (compared to bone shaft, spleen and bladder). Injection of CP resulted in a 22.5- and 93-fold decrease in GM-CSF and IL-6 levels, respectively, in lung-conditioned medium, while treatment with quinolones resulted in 2-4-fold increase in GM-CSF with no effect on IL-6 production. G-CSF treatment had no enhancing effect on GM-CSF nor on IL-6 production. We conclude that moxifloxacin and ciprofloxacin administered to CP-injected mice revert some of the immune suppressive effects of cyclophosphamide.

Original languageEnglish
Pages (from-to)287-296
Number of pages10
JournalEuropean Journal of Haematology
Issue number5
StatePublished - 2001


  • Ciprofloxacin
  • Hematopoiesis
  • Leukopenia
  • Moxifloxacin


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