Abstract：
:Recently, the interleukin-2 receptor (IL-2R) was shown to be present on human neutrophils, and IL-2-neutrophil interactions are believed to be important in both tumor rejection and increased susceptibility to bacterial infections. Furthermore, neutrophils have been shown to synthesize host defense proteins, such as cytokines. In this study, we analyzed the effects of IL-2 on the induction of de novo RNA and protein synthesis in this cell type. When cells were stimulated with IL-2 alone, the level of incorporation of either [5-3H]-uridine or [35S]-methionine and [35S]-cysteine was similar to unstimulated cells. However, when cells were stimulated with the combination of a fixed concentration of granulocyte-macrophage colony-stimulating factor (GM-CSF), a dose-dependent effect of IL-2 was observed on the induction of both RNA and protein synthesis. In the presence of tumor necrosis factor-alpha or formyl-methionyl-leucyl-phenylalanine, however, IL-2 exerted no similar effect. Furthermore, the study of a large number of normal subjects (n = 55) showed reproducible categories of responders (low, intermediate, and high). The binding of IL-2 to the IL-2R complex on human neutrophils increased on GM-CSF-stimulated neutrophils compared with unstimulated cells. However, no increase in the level of expression of either the alpha or beta chains of this receptor complex was observed. This finding suggests that GM-CSF functionally activates the IL-2R, but does not regulate its level of expression. Finally, we found that human neutrophils constitutively express IL-2R gamma chain mRNA and thus have the potential to express the functional IL-2R complex. Our findings on IL-2-neutrophil interactions should lead to new avenues of research in understanding the responses of patients undergoing GM-CSF or IL-2 therapy.
journal_name
Bloodjournal_title
Bloodauthors
Girard D,Gosselin J,Heitz D,Paquin R,Beaulieu ADsubject
Has Abstractpub_date
1995-08-01 00:00:00pages
1170-6issue
3eissn
0006-4971issn
1528-0020journal_volume
86pub_type
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