Pituitary Tumors Express Growth Hormone Peptide Receptors That Can Release Hormones
Most human pituitary adenomas express functional GH secretagogue receptors regardless of tumor type, with clinical implications for tumor diagnosis and the effects of GH peptide therapy in patients with pituitary tumors.
Quick Facts
What This Study Found
GHS-R was expressed in 28 of 30 pituitary adenomas across all subtypes, not just GH-secreting tumors. Functional studies showed GH secretagogues stimulated hormone release from multiple tumor types in culture.
Key Numbers
How They Did This
In-vitro study of 30 surgically removed human pituitary adenomas (6 GH, 3 GH-PRL, 6 PRL, 5 ACTH, 1 TSH, 4 gonadotroph, 5 non-secreting). RT-PCR for GHS-R mRNA, triple in-situ hybridization for cellular localization, and cell culture for functional hormone release studies.
Why This Research Matters
If GH secretagogues can stimulate hormone release from pituitary tumors, this has safety implications for patients using these peptides who may have undiagnosed pituitary adenomas (which are surprisingly common).
The Bigger Picture
Pituitary microadenomas are found in up to 20% of the general population at autopsy. If GH secretagogues can activate receptors on these tumors, there are potential safety considerations for widespread GH peptide use.
What This Study Doesn't Tell Us
In-vitro study on surgically removed tumors, which may not represent the full range of pituitary adenomas. Cell culture responses may differ from in-vivo tumor behavior. Clinical significance of receptor expression was not determined.
Questions This Raises
- ?Could GH secretagogue use stimulate growth of pituitary adenomas?
- ?Should patients be screened for pituitary tumors before GH peptide therapy?
- ?Can GHS-R expression be used as a diagnostic marker for pituitary tumor classification?
Trust & Context
- Key Stat:
- 28 of 30 tumors Nearly all pituitary adenomas expressed functional GH secretagogue receptors, regardless of tumor type — not just GH-secreting tumors
- Evidence Grade:
- Preliminary but comprehensive in-vitro evidence from 30 human tumors with both molecular and functional characterization.
- Study Age:
- Published in 1999. The clinical significance of GHS-R expression in pituitary tumors continues to be studied.
- Original Title:
- Expression of functional growth hormone secretagogue receptors in human pituitary adenomas: polymerase chain reaction, triple in-situ hybridization and cell culture studies.
- Published In:
- Journal of neuroendocrinology, 11(7), 491-502 (1999)
- Authors:
- Barlier, A, Zamora, A J, Grino, M, Gunz, G, Pellegrini-Bouiller, I, Morange-Ramos, I, Figarella-Branger, D, Dufour, H, Jaquet, P, Enjalbert, A
- Database ID:
- RPEP-00509
Evidence Hierarchy
Frequently Asked Questions
Are pituitary tumors common?
Small pituitary tumors (microadenomas) are found in up to 20% of people at autopsy, often without causing symptoms. The fact that these tumors express GH secretagogue receptors means GH peptide use could potentially affect them.
Does this mean GH peptides are dangerous for people with pituitary tumors?
Not necessarily, but it's a concern. If GH secretagogues can stimulate hormone release from pituitary tumors, they could worsen conditions like Cushing's disease or prolactinomas. This highlights the importance of medical evaluation before using GH peptides.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00509APA
Barlier, A; Zamora, A J; Grino, M; Gunz, G; Pellegrini-Bouiller, I; Morange-Ramos, I; Figarella-Branger, D; Dufour, H; Jaquet, P; Enjalbert, A. (1999). Expression of functional growth hormone secretagogue receptors in human pituitary adenomas: polymerase chain reaction, triple in-situ hybridization and cell culture studies.. Journal of neuroendocrinology, 11(7), 491-502.
MLA
Barlier, A, et al. "Expression of functional growth hormone secretagogue receptors in human pituitary adenomas: polymerase chain reaction, triple in-situ hybridization and cell culture studies.." Journal of neuroendocrinology, 1999.
RethinkPeptides
RethinkPeptides Research Database. "Expression of functional growth hormone secretagogue recepto..." RPEP-00509. Retrieved from https://rethinkpeptides.com/research/barlier-1999-expression-of-functional-growth
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.