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Increase in peripheral blood megakaryocyte progenitors following cancer therapy with high-dose cyclophosphamide and hematopoietic growth factors.

Abstract：

:Seven patients received cancer chemotherapy with high-dose cyclophosphamide (HD-CTX) associated with either recombinant human granulocyte colony-stimulating factor (rhG-CSF), rh interleukin-3 (rhIL-3), rh granulocyte-macrophage CSF (rhGM-CSF) plus rh erythropoietin (rhEpo), rhIL-3 plus rhGM-CSF, or rhIL-3 plus rhG-CSF. In the steady-state blood samples (before HD-CTX), megakaryocyte burst-forming units (BFU-Meg) and megakaryocyte colony-forming units (CFU-Meg) were virtually undetectable (< or = 1/mL BFU-Meg and CFU-Meg, range 0 to 1) by assaying unfractionated leukocytes. In contrast, in the recovery-phase blood samples (after HD-CTX), BFU-Meg and CFU-Meg increased several hundred-fold over steady-state values. This occurred regardless of the in vivo growth factors used and in parallel with increases in mixed, erythroid, and myeloid progenitors. In vitro, recovery-phase BFU-Meg and CFU-Meg responded to the novel GM-CSF/IL-3 fusion protein PIXY321 similarly as to optimal concentrations of rhIL-3 and rhGM-CSF. However, these progenitors differed from those in the steady state because BFU-Meg had faster duplication time and CFU-Meg prevailed numerically (CFU-Meg to BFU-Meg ratio 3.4 [recovery] vs. 0.52 [steady state]). Furthermore, soluble c-kit ligand/rh stem cell factor (rhSCF), in vitro in combination with rhIL-3 and rhGM-CSF or PIXY321, increased the size but not the number of colonies derived from recovery-phase BFU-Meg and CFU-Meg. These quantitative and qualitative changes occurring in circulating megakaryocyte progenitors contribute to the understanding of the rapid platelet recovery that occurs when peripheral blood hematopoietic progenitors elicited by HD-CTX and growth factor(s) are transplanted into patients treated with myeloablative chemoradiotherapy.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Siena S,Bregni M,Bonsi L,Sklenar I,Bagnara GP,Bonadonna G,Gianni AM

subject

Has Abstract

pub_date

1993-11-01 00:00:00

pages

1583-90

issue

12

eissn

0301-472X

issn

1873-2399

journal_volume

21

pub_type

杂志文章

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