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• W2000982471 endingPage "e68083" @default.
• W2000982471 startingPage "e68083" @default.
• W2000982471 abstract "Erythropoietin (Epo) is a cytokine that binds and activates an Epo receptor (EpoR) expressed on the surface of erythroid progenitor cells to promote erythropoiesis. While early studies suggested EpoR transcripts were expressed exclusively in the erythroid compartment, low-level EpoR transcripts were detected in nonhematopoietic tissues and tumor cell lines using sensitive RT-PCR methods. However due to the widespread use of nonspecific anti-EpoR antibodies there are conflicting data on EpoR protein expression. In tumor cell lines and normal human tissues examined with a specific and sensitive monoclonal antibody to human EpoR (A82), little/no EpoR protein was detected and it was not functional. In contrast, EpoR protein was reportedly detectable in a breast tumor cell line (MCF-7) and breast cancer tissues with an anti-EpoR polyclonal antibody (M-20), and functional responses to rHuEpo were reported with MCF-7 cells. In another study, a functional response was reported with the lung tumor cell line (NCI-H838) at physiological levels of rHuEpo. However, the specificity of M-20 is in question and the absence of appropriate negative controls raise questions about possible false-positive effects. Here we show that with A82, no EpoR protein was detectable in normal human and matching cancer tissues from breast, lung, colon, ovary and skin with little/no EpoR in MCF-7 and most other breast and lung tumor cell lines. We show further that M-20 provides false positive staining with tissues and it binds to a non-EpoR protein that migrates at the same size as EpoR with MCF-7 lysates. EpoR protein was detectable with NCI-H838 cells, but no rHuEpo-induced phosphorylation of AKT, STAT3, pS6RP or STAT5 was observed suggesting the EpoR was not functional. Taken together these results raise questions about the hypothesis that most tumors express high levels of functional EpoR protein." @default.
• W2000982471 created "2016-06-24" @default.
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• W2000982471 date "2013-07-04" @default.
• W2000982471 modified "2023-10-14" @default.
• W2000982471 title "Epo Receptors Are Not Detectable in Primary Human Tumor Tissue Samples" @default.
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• W2000982471 doi "https://doi.org/10.1371/journal.pone.0068083" @default.
• W2000982471 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3701640" @default.
• W2000982471 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23861852" @default.
• W2000982471 hasPublicationYear "2013" @default.
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