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Journal of Endocrinology (2002) 172, R7-11       DOI: 10.1677/joe.0.172R007
© 2002 Society for Endocrinology
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Journal of Endocrinology, Vol 172, Issue 3, R7-11
Copyright © 2002 by Society for Endocrinology

Articles

Expression and action of the growth hormone releasing peptide ghrelin and its receptor in prostate cancer cell lines

PL Jeffery, AC Herington, and LK Chopin


This study has examined the expression of two new facets of the growth hormone axis, the growth hormone secretagogue receptor (GHS-R) and its recently identified putative natural ligand ghrelin, in prostate cancer cells. GHS-R 1a and 1b isoforms and ghrelin mRNA expression were detected by RT-PCR in the ALVA-41, LNCaP, DU145 and PC3 prostate cancer cell lines. A normal prostate cDNA library expressed GHS-R1a, but not the 1b isoform or ghrelin. Immunohistochemical staining for the GHS-R 1a isoform and ghrelin was positive in the four cell lines studied. PC3 cells showed increased cell proliferation in vitro in response to ghrelin to levels 33% above untreated controls, implying a potential tumour-promoting role for ghrelin in this tissue. This study is the first to demonstrate the co-expression of the GHS-R and ghrelin in prostate cancer cells. It is also the first study to provide evidence that a previously unrecognised autocrine/paracrine pathway involving ghrelin, that is capable of stimulating growth, exists in prostate cancer.


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