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Paclitaxel vs cyclophosphamide in peripheral blood stem cell mobilization: comparative studies in a murine model
U N Verma1, B van den Blink, R Pillai
1Division of Hematology and Oncology, Georgetown University Medical Center, Vincent T. Lombardi Cancer Center, Washington, DC 20007, USA.
Experimental Hematology
|March 25, 1999
Summary
Paclitaxel effectively mobilizes peripheral blood stem cells (PBSC) earlier than cyclophosphamide (Cy) in mice. Paclitaxel-mobilized PBSC also show preserved function and less cellular disruption compared to Cy-mobilized PBSC.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- Paclitaxel is a chemotherapy agent used for breast and ovarian cancers.
- Peripheral blood stem cell (PBSC) mobilization is crucial for certain cancer therapies.
- Cyclophosphamide (Cy) is a standard agent for PBSC mobilization.
Purpose of the Study:
- To compare the efficacy of paclitaxel versus cyclophosphamide (Cy) in mobilizing PBSC in a murine model.
- To assess the impact of paclitaxel and Cy on the phenotypic and functional characteristics of mobilized PBSC.
Main Methods:
- C57B1/6 mice received injections of Cy or paclitaxel.
- Spleens were harvested at different time points (days 4, 6, 8, 10) to isolate PBSC.
- Hematopoietic progenitor cells (CFU-C) were quantified.
- Lymphoid cell subsets and cytotoxic effector cell function of mobilized PBSC were analyzed in vitro.
Main Results:
- Paclitaxel treatment resulted in significantly higher hematopoietic progenitor cells (CFU-C) on day 4 compared to Cy.
- While Cy showed higher CFU-C by day 6, the total CFU-C recovered per spleen was comparable between groups.
- Paclitaxel mobilization caused less perturbation of lymphoid cell subsets and preserved cytotoxic effector cell function compared to Cy.
Conclusions:
- Paclitaxel is an effective mobilizer of PBSC, inducing earlier mobilization than Cy.
- Paclitaxel-mobilized PBSC exhibit less phenotypic and functional impairment, suggesting a potentially safer alternative to Cy for PBSC mobilization.