GH Secretagogue Receptors Found in Human Pituitary Tumors
The growth hormone secretagogue receptor (GHS-R) is expressed in human pituitary tumors and rat GH3 cells, suggesting these tumors retain responsiveness to GHRPs.
Quick Facts
What This Study Found
GHS-R type 1a (active) and type 1b (inactive) mRNA was detected in human pituitary tumor tissue and rat GH3 cells via RT-PCR, confirming these tumors express the GHRP receptor.
Key Numbers
How They Did This
RT-PCR analysis of GHS-R mRNA expression in surgically removed human pituitary adenomas and rat GH3 cell lines, with comparison of type 1a vs. 1b receptor isoform expression.
Why This Research Matters
The presence of functional GHRP receptors in pituitary tumors has clinical implications: GHRP stimulation tests could help diagnose pituitary adenomas, and understanding receptor expression patterns may reveal how these tumors maintain or lose normal regulatory controls.
The Bigger Picture
This finding connects GH secretagogue biology to clinical endocrinology. Pituitary tumors are relatively common, and knowing they retain GHS-R expression helps explain why patients with these tumors often respond to GHRP stimulation tests — a tool used in clinical diagnosis of pituitary disorders.
What This Study Doesn't Tell Us
mRNA detection doesn't confirm functional protein expression. Limited number of tumor samples. Tumor heterogeneity means not all pituitary adenomas may show the same receptor profile.
Questions This Raises
- ?Does GHS-R expression level correlate with tumor aggressiveness or GH hypersecretion?
- ?Could GHS-R be a therapeutic target in pituitary adenomas?
- ?Do non-functioning pituitary adenomas also express GHS-R?
Trust & Context
- Key Stat:
- GHS-R 1a + 1b detected Both active and inactive receptor isoforms found in human pituitary adenomas via RT-PCR
- Evidence Grade:
- Molecular biology study with appropriate methodology. Demonstrates receptor presence but not functional significance. Published in a top endocrinology journal.
- Study Age:
- Published in 1998, shortly after the GHS-R was cloned. Foundational for understanding GHRP receptor distribution in pituitary disease.
- Original Title:
- Presence of growth hormone secretagogue receptor messenger ribonucleic acid in human pituitary tumors and rat GH3 cells.
- Published In:
- The Journal of clinical endocrinology and metabolism, 83(2), 638-42 (1998)
- Authors:
- Adams, E F(2), Huang, B, Buchfelder, M(2), Howard, A, Smith, R G, Feighner, S D, van der Ploeg, L H, Bowers, C Y, Fahlbusch, R
- Database ID:
- RPEP-00445
Evidence Hierarchy
Frequently Asked Questions
What is the GH secretagogue receptor?
The GHS-R is a receptor in the brain and pituitary gland that responds to growth hormone-releasing peptides (GHRPs). When activated, it triggers growth hormone release. It's also the receptor for ghrelin.
Why does it matter that pituitary tumors have this receptor?
It means these tumors can still respond to GHRP stimulation, which is useful for diagnostic testing. It also raises questions about whether the receptor plays a role in tumor growth or hormone overproduction.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-00445APA
Adams, E F; Huang, B; Buchfelder, M; Howard, A; Smith, R G; Feighner, S D; van der Ploeg, L H; Bowers, C Y; Fahlbusch, R. (1998). Presence of growth hormone secretagogue receptor messenger ribonucleic acid in human pituitary tumors and rat GH3 cells.. The Journal of clinical endocrinology and metabolism, 83(2), 638-42.
MLA
Adams, E F, et al. "Presence of growth hormone secretagogue receptor messenger ribonucleic acid in human pituitary tumors and rat GH3 cells.." The Journal of clinical endocrinology and metabolism, 1998.
RethinkPeptides
RethinkPeptides Research Database. "Presence of growth hormone secretagogue receptor messenger r..." RPEP-00445. Retrieved from https://rethinkpeptides.com/research/adams-1998-presence-of-growth-hormone
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.