Carcinogenesis Advance Access originally published online on April 24, 2003
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Carcinogenesis, Vol. 24, No. 6, 1021-1029,
June 2003
© 2003 Oxford University Press
CANCER BIOLOGY |
Erythropoietin regulates tumour growth of human malignancies
Department of Anatomy, Division 1, Kinki University School of Medicine, Osaka-Sayama, Osaka 589-8511
1 Department of Surgery, Division 1, Kinki University School of Medicine, Osaka-Sayama, Osaka 589-8511
2 Research Reactor Institute of Kyoto University, Osaka 590-0451
3 Department of Obstetrics and Gynaecology, Kyorin University School of Medicine, Mitaka 181-8611
4 Laboratory of Environmental Biology, Hokkaido University School of Medicine, Hokkaido 060-8638, Japan
5 To whom correspondence should be addressed Email: y1126yas{at}med.kindai.ac.jp
In addition to the chief function of erythropoietin (Epo) in promoting erythropoiesis, some other roles have been found in the brain and uterus. We have reported that signalling pathways of Epo and Epo receptor (EpoR) are involved in the tumourigenesis of ovarian and uterine cancers. To determine whether Epo plays a similar role in other malignancies, we studied the expression of Epo in several malignant human cell lines. We found that 24 malignant human cell lines examined express Epo and EpoR regardless of their origins, types, genetic characteristics and biological properties and secrete a very small amount of Epo individually and that most of them respond to hypoxic stimuli by enhanced secretion of Epo. To determine whether the Epo–EpoR pathway operates in tumours of these cell lines, we transplanted several cell lines into nude mice and confirmed the presence of Epo-responsive sites in xenografts in which the phosphorylation of the STAT5 (signal transducer and activator of transcription) is detectable. Furthermore, in nude mice we blocked the Epo signalling in xenografts of two representative cell lines, stomach choriocarcinoma and melanoma, by i.p. injections of EpoR antagonist and found inhibition of angiogenesis and survival of tumour cells leading to destruction of tumour masses and disturbances of phosphorylation of STAT5. In contrast, Epo mimetic peptide promotes angiogenesis and tumour cell survival. These findings suggest that Epo is indispensable for the growth and viability of malignant tumour and also that the deprivation of Epo signalling may be a promising therapy for human malignancy.
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