Human Fetuses Already Have Working Growth Hormone Peptide Receptors
The human fetal pituitary expresses functional GHRP receptors by mid-gestation, and GHRP-2 stimulated GH release from fetal pituitary cells, showing the GH secretagogue system is active before birth.
Quick Facts
What This Study Found
GHRP receptor mRNA was detected in human fetal pituitary by RT-PCR, and GHRP-2 stimulated dose-dependent GH release from cultured fetal pituitary cells, demonstrating functional GH secretagogue receptors are present before birth.
Key Numbers
How They Did This
In-vitro study using human fetal pituitary tissue. RT-PCR detected GHRP receptor mRNA expression. Cultured fetal pituitary cells were stimulated with GHRP-2 to demonstrate functional GH release.
Why This Research Matters
Knowing the GH secretagogue system is active in fetal development suggests it plays a role in prenatal growth, which has implications for understanding growth disorders and the safety considerations of GH-releasing peptides in reproductive contexts.
The Bigger Picture
Growth hormone is crucial for prenatal development. The finding that fetal pituitary cells already respond to GH-releasing peptides suggests this signaling pathway is important from very early in development, not just after birth.
What This Study Doesn't Tell Us
In-vitro study using isolated fetal tissue. Whether GHRP receptor activation plays a physiological role in fetal growth was not established. Limited fetal tissue availability restricts sample sizes.
Questions This Raises
- ?Does endogenous ghrelin activate fetal pituitary GHRP receptors to regulate prenatal growth?
- ?Could GHRP receptor dysfunction contribute to intrauterine growth restriction?
- ?At what gestational age do GHRP receptors first appear?
Trust & Context
- Key Stat:
- Active before birth Functional GHRP receptors are present in the human fetal pituitary, with GHRP-2 stimulating dose-dependent GH release
- Evidence Grade:
- Moderate evidence from a well-designed in-vitro study with both molecular (mRNA detection) and functional (GH release) confirmation in human fetal tissue.
- Study Age:
- Published in 1998. The role of ghrelin/GHS-R in fetal development has been further studied, confirming early developmental expression of this receptor system.
- Original Title:
- Human fetal pituitary expresses functional growth hormone-releasing peptide receptors.
- Published In:
- The Journal of clinical endocrinology and metabolism, 83(1), 174-8 (1998)
- Database ID:
- RPEP-00493
Evidence Hierarchy
Frequently Asked Questions
Why does it matter that fetuses have these receptors?
It means the growth hormone-releasing peptide system is active during prenatal development, suggesting it helps regulate fetal growth. This is important for understanding growth disorders that begin before birth.
Is this related to ghrelin?
Yes. The GHRP receptor found in fetal pituitary is the same receptor later identified as the ghrelin receptor. This finding implies ghrelin signaling is important for growth even before birth.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-00493APA
Shimon, I; Yan, X; Melmed, S. (1998). Human fetal pituitary expresses functional growth hormone-releasing peptide receptors.. The Journal of clinical endocrinology and metabolism, 83(1), 174-8.
MLA
Shimon, I, et al. "Human fetal pituitary expresses functional growth hormone-releasing peptide receptors.." The Journal of clinical endocrinology and metabolism, 1998.
RethinkPeptides
RethinkPeptides Research Database. "Human fetal pituitary expresses functional growth hormone-re..." RPEP-00493. Retrieved from https://rethinkpeptides.com/research/shimon-1998-human-fetal-pituitary-expresses
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.