Erythropoietin receptor transcription is neither elevated nor predictive of surface expression in human tumour cells

Sinclair, A. M., Rogers, N., Busse, L., Archibeque, I., Brown, W., Kassner, P. D., Watson, J. E. V., Arnold, G. E., Nguyen, K. C. Q., Powers, S., Elliott, S. (March 2008) Erythropoietin receptor transcription is neither elevated nor predictive of surface expression in human tumour cells. British Journal of Cancer, 98 (6). pp. 1059-1067. ISSN 0007-0920

URL: http://www.ncbi.nlm.nih.gov/pubmed/18349818
DOI: 10.1038/sj.bjc.6604220

Abstract

Erythropoietin receptor (EpoR) has been reported to be overexpressed in tumours and has raised safety concerns regarding the use of erythropoiesis-stimulating agents (ESAs) to treat anaemia in cancer patients. To investigate the potential for EpoR to be overexpressed in tumours, we have evaluated human tumours for amplification of the EPOR locus, levels of EPOR transcripts, and expression of surface EpoR protein. Gene amplification analysis of 1083 solid tumours found that amplification of the EPOR locus was rare with frequencies similar to other non-oncogenes. EPOR transcript levels in tumours and tumour cell lines were low in comparison with bone marrow and were equivalent to, or lower than, levels in normal tissues of tumour origin. Although EpoR mRNA was detected in some tumour lines, no EpoR could be detected on the cell surface using 125I-Epo binding studies. This may be due to the lack of EpoR protein expression or lack of cell-surface-trafficking factors, such as Jak2. Taken together, we have found no evidence that EpoR is overexpressed in tumours or gets to the surface of tumour cells. This suggests that there is no selective advantage for tumours to overexpress EpoR and questions the functional relevance of EpoR gene transcription in tumours.

Item Type: Paper
Uncontrolled Keywords: erythropoietin receptor expression transcript protein Epo binding tumours
Subjects: diseases & disorders > cancer
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > transcription
diseases & disorders
bioinformatics > genomics and proteomics > genetics & nucleic acid processing
bioinformatics > genomics and proteomics
organism description > animal > mammal > primates > hominids > human
CSHL Authors:
Communities: CSHL labs > Powers lab
Depositing User: Matt Covey
Date: March 2008
Date Deposited: 26 Feb 2013 20:28
Last Modified: 26 Feb 2013 20:28
PMCID: PMC2275479
Related URLs:
URI: http://repository.cshl.edu/id/eprint/27525

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