The expression of the pituitary growth hormone-releasing hormone receptor and its splice variants in normal and neoplastic human tissues

Alexandre Havt, Andrew V Schally, Gabor Halmos, Jozsef L. Varga, Gabor L. Toller, Judit E. Horvath, Karoly Szepeshazi, Frank Köster, Kevin Kovitz, Kate Groot, Marta Zarandi, Celia A. Kanashiro

Research output: Contribution to journalArticle

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Abstract

Various attempts to detect human pituitary growth hormone-releasing hormone receptor (pGHRH-R) in neoplastic extrapituitary tissues have thus far failed. Recently, four splice variants (SVs) of GHRH-R have been described, of which SV1 has the highest structural homology to pGHRH-R and likely plays a role in tumor growth. The aim of this study was to reinvestigate whether human tumors and normal human extrapituitary tissues express the pGHRH-R and to corroborate our previous findings on its SVs. Thus, we developed a real-time PCR method for the detection of the mRNA for the pGHRH-R, its SVs, and the GHRH peptide. Using real-time PCR, Western blotting, and radioligand-binding assays, we detected the mRNA for pGHRH-R and pGHRH-R protein in various human cancer cell lines grown in nude mice and in surgical specimens of human lung cancers. The expression of mRNA for SVs of pGHRH-R and GHRH was likewise found in xenografts of human non-Hodgkin's lymphomas, pancreatic cancer, glioblastoma, small-cell lung carcinomas, and in human nonmalignant prostate, liver, lung, kidney, and pituitary. Western blots showed that these normal and malignant human tissues contain SV1 protein and immunoreactive GHRH. Our results demonstrate that some normal human tissues and tumors express mRNA and protein for the pGHRH-R and its splice variants. These findings confirm and extend the concept that GHRH and its receptors play an important role in the pathophysiology of human cancers.

Original languageEnglish
Pages (from-to)17424-17429
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number48
DOIs
StatePublished - Nov 29 2005
Externally publishedYes

Fingerprint

Pituitary Hormone-Regulating Hormone Receptors
Growth Hormone
Messenger RNA
Neoplasms
Real-Time Polymerase Chain Reaction
Western Blotting
somatotropin releasing hormone receptor
Radioligand Assay
Proteins
Human Growth Hormone
Small Cell Lung Carcinoma
Glioblastoma
Pancreatic Neoplasms
Heterografts
Nude Mice
Non-Hodgkin's Lymphoma
Prostate
Lung Neoplasms

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

The expression of the pituitary growth hormone-releasing hormone receptor and its splice variants in normal and neoplastic human tissues. / Havt, Alexandre; Schally, Andrew V; Halmos, Gabor; Varga, Jozsef L.; Toller, Gabor L.; Horvath, Judit E.; Szepeshazi, Karoly; Köster, Frank; Kovitz, Kevin; Groot, Kate; Zarandi, Marta; Kanashiro, Celia A.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 102, No. 48, 29.11.2005, p. 17424-17429.

Research output: Contribution to journalArticle

Havt, A, Schally, AV, Halmos, G, Varga, JL, Toller, GL, Horvath, JE, Szepeshazi, K, Köster, F, Kovitz, K, Groot, K, Zarandi, M & Kanashiro, CA 2005, 'The expression of the pituitary growth hormone-releasing hormone receptor and its splice variants in normal and neoplastic human tissues', Proceedings of the National Academy of Sciences of the United States of America, vol. 102, no. 48, pp. 17424-17429. https://doi.org/10.1073/pnas.0506844102
Havt, Alexandre ; Schally, Andrew V ; Halmos, Gabor ; Varga, Jozsef L. ; Toller, Gabor L. ; Horvath, Judit E. ; Szepeshazi, Karoly ; Köster, Frank ; Kovitz, Kevin ; Groot, Kate ; Zarandi, Marta ; Kanashiro, Celia A. / The expression of the pituitary growth hormone-releasing hormone receptor and its splice variants in normal and neoplastic human tissues. In: Proceedings of the National Academy of Sciences of the United States of America. 2005 ; Vol. 102, No. 48. pp. 17424-17429.
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