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Expression of erythropoietin receptor and in vitro functional effects of epoetins in B-cell malignancies
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2007 (English)In: Clinical Cancer Research, ISSN 1078-0432, E-ISSN 1557-3265, Vol. 13, no 12, 3536-3544 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: Erythropoietin (EPO) and EPO receptor (EPO-R) expression have been reported in solid tumors and are claimed to regulate tumor growth; however, no data have been published on this issue in B-cell malignancies or normal lymphoid cells. This report describes genomic/protein EPO-R expression and in vitro effects of recombinant human EPO (epoetin) in B-cell chronic lymphocytic leukemia (B-CLL), mantle-cell lymphoma (MCL), and multiple myeloma (MM).

Experimental Design: Blood samples were obtained from patients with B-CLL, MCL, and healthy volunteers, and bone marrow was obtained from MM patients. EPO-R mRNA was detected by reverse transcription-PCR. EPO-R surface expression was investigated by flow cytometry using digoxigenin-labeled epoetin and polyclonal rabbit anti–EPO-R antibody for intracellular receptor. Tumor cell stimulation was determined in vitro using [3H]thymidine incorporation and CD69 expression after exposure to epoetin α or β or darbepoetin α.

Results: EPO-R mRNA was detected in mononuclear cells from 32 of 41 (78%) B-CLL and 5 of 7 (71%) MCL patients, and 21 of 21 (100%) MM samples. Expression was also detected in highly purified T cells from six of eight B-CLL patients, four of four MM patients, and normal donor B and T cells. Surface EPO-R protein was not detected. Intracellular EPO-R staining with anti–EPO-R antibodies was unspecific. No tumor-stimulatory effect was observed with high epoetin concentrations.

Conclusions:EPO-R gene is frequently expressed in lymphoid malignancies and normal B and T cells. However, there was no surface protein expression and no epoetin-induced in vitro stimulation of tumor B cells, indicating that epoetin therapy in vivo is likely to be safe in patients with lymphoid malignancies.

Place, publisher, year, edition, pages
2007. Vol. 13, no 12, 3536-3544 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-16089DOI: 10.1158/1078-0432.CCR-06-2828ISI: 000247336200014PubMedID: 17575216OAI: oai:DiVA.org:uu-16089DiVA: diva2:43860
Available from: 2008-05-21 Created: 2008-05-21 Last updated: 2011-01-31Bibliographically approved

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Jernberg-Wiklund, Helena
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