Effects of in vivo administration of stem cell factor on thrombopoiesis in normal and immunodeficient mice.

Abstract:

:Thrombocytopenia is an important clinical problem for many acquired immunodeficiency syndrome (AIDS) patients. Recently, the utility of recombinant cytokines in alleviating the hematopoietic complications of AIDS and AIDS therapy has been evaluated. The newly cloned cytokine stem cell factor (SCF) has been demonstrated to be a potent regulator of hematopoietic progenitor cell proliferation. Therefore, we evaluated the ability of SCF to alleviate thrombocytopenia caused by infection with LP-BM5 murine leukemia virus (mLV) in a murine model of AIDS (MAIDS). In addition, we evaluated the effects of SCF on previously demonstrated azidothymidine (AZT)-induced elevations of platelet counts. SCF was administered to normal or LP-BMS-infected C57BL/6 mice in combination with oral AZT for up to 1 month and effects on platelet, megakaryocyte (MK), and megakaryocyte colony-forming cell (CFU-MK) numbers were evaluated. SCF alone significantly increased the number of circulating platelets in thrombocytopenic MAIDS mice by 53%. SCF also significantly elevated platelet levels by 29% in normal mice. AZT elevated platelet counts 100% in normal and 50% in MAIDS mice. AZT and SCF increased platelet counts in an additive manner. SCF alone was a potent inducer of splenic CFU-MK in both MAIDS and normal mice, increasing splenic CFU-MK 13- to 15-fold at day 15 as compared with untreated controls. By day 30, however, the numbers of splenic CFU-MK had returned to control levels. In infected mice, AZT alone increased the number of splenic CFU-MK. SCF administered to AZT-treated MAIDS mice did not further enhance these increases. In contrast, in normal mice, AZT decreased splenic CFU-MK numbers. In AZT-treated mice, SCF enhanced the numbers of splenic CFU-MK 90-fold at day 8. In MAIDS mice, the number of bone marrow CFU-MK was significantly increased by SCF treatment at all time points. SCF significantly affected the total number of femoral CFU-MK in AZT-treated mice only at day 15. In normal mice, SCF or SCF and AZT in combination increased the total number of bone marrow CFU-MK five-fold at day 8, but failed to induce changes in the total number of femoral CFU-MK after that. These results indicate that SCF elevates platelet levels in both thrombocytopenic MAIDS and normal mice and profoundly affects CFU-MK proliferation. Combinations of SCF and AZT may be further explored to enhance the therapeutic effectiveness of these two drugs in alleviating thrombocytopenia.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Chow FP,Zsebo K,Hamburger AW

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

1255-62

issue

9

eissn

0301-472X

issn

1873-2399

journal_volume

21

pub_type

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