Abstract:
:Azidothymidine (AZT)-induced anemia in mice can be reversed by the administration of IGF-IL-3 (fusion protein of insulin-like growth factor II (IGF II) and interleukin 3). Although interleukin 3 (IL-3) and erythropoietin (EPO) are known to act synergistically on hematopoietic cell proliferation in vitro, injection of IGF-IL-3 and EPO in AZT-treated mice resulted in a reduction of red cells and an increase of plasma EPO levels as compared to animals treated with IGF-IL-3 or EPO alone. We tested the hypothesis that the antagonistic effect of IL-3 and EPO on erythroid cells may be mediated by endothelial cells. Bovine liver erythroid cells were cultured on monolayers of human bone marrow endothelial cells previously treated with EPO and IGF-IL-3. There was a significant reduction of thymidine incorporation into both erythroid and endothelial cells in cultures pre-treated with IGF-IL-3 and EPO. Endothelial cell culture supernatants separated by ultrafiltration and ultracentrifugation from cells treated with EPO and IL-3 significantly reduced thymidine incorporation into erythroid cells as compared to identical fractions obtained from the media of cells cultured with EPO alone. These results suggest that endothelial cells treated simultaneously with EPO and IL-3 have a negative effect on erythroid cell production.
journal_name
Cytokinejournal_title
Cytokineauthors
DiFalco MR,Congote LFdoi
10.1006/cyto.2002.1029keywords:
subject
Has Abstractpub_date
2002-04-07 00:00:00pages
51-60issue
1eissn
1043-4666issn
1096-0023pii
S104346660291029Xjournal_volume
18pub_type
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