The Expression of Growth Hormone-Releasing Hormone (GHRH) and Splice Variants of Its Receptor in Human Gastroenteropancreatic Carcinomas

Splice variants (SVs) of receptors for growth hormone-releasing hormone (GHRH) have been found in primary human prostate cancers and diverse human cancer cell lines. GHRH antagonists inhibit growth of various experimental human cancers, including pancreatic and colorectal, xenografted into nude mice...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2002-09, Vol.99 (18), p.11866-11871
Hauptverfasser: Busto, Rebeca, Schally, Andrew V., Varga, Jozsef L., Garcia-Fernandez, M. Olga, Groot, Kate, Armatis, Patricia, Szepeshazi, Karoly
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container_issue 18
container_start_page 11866
container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 99
creator Busto, Rebeca
Schally, Andrew V.
Varga, Jozsef L.
Garcia-Fernandez, M. Olga
Groot, Kate
Armatis, Patricia
Szepeshazi, Karoly
description Splice variants (SVs) of receptors for growth hormone-releasing hormone (GHRH) have been found in primary human prostate cancers and diverse human cancer cell lines. GHRH antagonists inhibit growth of various experimental human cancers, including pancreatic and colorectal, xenografted into nude mice or cultured in vitro, and their antiproliferative action could be mediated in part through SVs of GHRH receptors. In this study we examined the expression of mRNA for GHRH and for SVs of its receptors in tumors of human pancreatic, colorectal, and gastric cancer cell lines grown in nude mice. mRNA for both GHRH and SV1isoform of GHRH receptors was expressed in tumors of pancreatic (SW1990, PANC-1, MIA PaCa-2, Capan-1, Capan-2, and CFPAC1), colonic (COLO 320DM and HT-29), and gastric (NCI-N87, HS746T, and AGS) cancer cell lines; mRNA for SV2was also present in Capan-1, Capan-2, CFPAC1, HT-29, and NCI-N87 tumors. In proliferation studies in vitro, the growth of pancreatic, colonic, and gastric cancer cells was stimulated by GHRH(1-29)NH2and inhibited by GHRH antagonist JV-1-38. The stimulation of some gastroenteropancreatic cancer cells by GHRH was followed by an increase in cAMP production, and GHRH antagonist JV-1-38 competitively inhibited this effect. Our study indicates the presence of an autocrine/paracrine stimulatory loop based on GHRH and SV1of GHRH receptors in human pancreatic, colorectal, and gastric cancers. The finding of SV1receptor in human cancers provides an approach to an antitumor therapy based on the blockade of this receptor by specific GHRH antagonists.
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subjects Animals
Base Sequence
Biological Sciences
Cancer
Cell growth
Cell lines
Cultured cells
Cyclic AMP - metabolism
Digestive system
DNA Primers
Gastrointestinal Neoplasms - genetics
Gastrointestinal Neoplasms - metabolism
Gastrointestinal Neoplasms - pathology
Growth Hormone-Releasing Hormone - analogs & derivatives
Growth Hormone-Releasing Hormone - antagonists & inhibitors
Growth Hormone-Releasing Hormone - genetics
Growth Hormone-Releasing Hormone - pharmacology
Hormones
Humans
Male
Messenger RNA
Mice
Mice, Nude
Pancreatic neoplasms
Polymerase chain reaction
Receptors
Receptors, Neuropeptide - genetics
Receptors, Pituitary Hormone-Regulating Hormone - genetics
Reverse Transcriptase Polymerase Chain Reaction
RNA Splicing
RNA, Messenger - genetics
Tumor cell line
Tumor Cells, Cultured
Tumors
title The Expression of Growth Hormone-Releasing Hormone (GHRH) and Splice Variants of Its Receptor in Human Gastroenteropancreatic Carcinomas
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