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. 1996 Apr 2;93(7):2785–2789. doi: 10.1073/pnas.93.7.2785

Apoptosis of hemopoietic cells by the human granulocyte-macrophage colony-stimulating factor mutant E21R.

P O Iversen 1, L B To 1, A F Lopez 1
PMCID: PMC39710  PMID: 8610118

Abstract

Human granulocyte-macrophage colony-stimulating factor (GM-CSF) binds to a high-affinity heterodimeric receptor composed of a specific alpha chain and a common beta chain (beta(c)), which is shared with the receptors for interleukins 3 and 5. Hemopoietic cell survival requires GM-CSF binding this high-affinity receptor. We have recently developed the GM-CSF mutant E21R, which selectively binds to the alpha chain and behaves as a competitive GM-CSF antagonist. We have now examined the role of E21R on the survival of hemopoietic cells and found that E21R causes apoptosis (programmed cell death) of normal and malignant cells directly in the absence of GM-CSF. The direct apoptotic effect of E21R occurred in a dose- and time-dependent manner. Apoptosis by E21R was dependent on cells expressing the high-affinity GM-CSF receptor and could be blocked by GM-CSF. Significantly, apoptosis of the cells occurred even in the presence of the survival factors granulocyte CSF and stem cell factor but was prevented by engagement of beta(c) with interleukin 3. The initiation of apoptosis required phosphorylation, transcriptional activity, and protein synthesis. These findings support a model whereby binding of E21R to the alpha chain leads to apoptosis, while beta(c) plays an important role in cell survival. This model may be applicable to other multimeric cytokine receptors and offers a novel approach for the treatment of human leukemia.

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