Immune Cells Produce Their Own Growth Hormone When Stimulated by GH Secretagogues
Hexarelin and GHRH stimulated GH production from porcine and human lymphocytes, demonstrating that immune cells have a local GH system that can be activated by GH secretagogues.
Quick Facts
What This Study Found
Hexarelin and GHRH stimulated GH production directly from porcine and human lymphocytes, demonstrating functional GHS-R and GHRH-R on immune cells with a local GH autocrine/paracrine system.
Key Numbers
How They Did This
In-vitro study using cultured porcine and human lymphocytes. Hexarelin and GHRH stimulation with GH measurement in culture supernatant by RIA. Receptor expression confirmed.
Why This Research Matters
A local GH system in immune cells means GH secretagogues could directly boost immune function — not just indirectly through pituitary GH release. This direct immune effect adds therapeutic value.
The Bigger Picture
The immune system produces many of the same hormones as the endocrine system, creating local signaling networks. This lymphocyte GH system adds immune function support to GH secretagogues' therapeutic profile.
What This Study Doesn't Tell Us
In-vitro lymphocyte culture. The amount of GH produced locally may be small relative to pituitary output. Physiological significance uncertain.
Questions This Raises
- ?Does local lymphocyte GH contribute to immune function maintenance?
- ?Could GH secretagogues enhance immunity through this local mechanism?
- ?Is immune cell GH production impaired in immunodeficiency?
Trust & Context
- Key Stat:
- Immune cells make GH Lymphocytes produced GH directly in response to hexarelin — GH secretagogues can enhance immune function through a local, pituitary-independent mechanism
- Evidence Grade:
- Preliminary in-vitro evidence from both porcine and human lymphocytes demonstrating direct GH production from immune cells.
- Study Age:
- Published in 2002. Local GH production by immune cells has been further characterized and is recognized as part of the immune-endocrine network.
- Original Title:
- Growth hormone secretagogue (GHS) analogue, hexarelin stimulates GH from peripheral lymphocytes.
- Published In:
- Experimental and clinical endocrinology & diabetes : official journal, German Society of Endocrinology [and] German Diabetes Association, 110(7), 343-7 (2002)
- Authors:
- Poppi, L, Dixit, V D, Baratta, M, Giustina, A, Tamanini, C, Parvizi, N
- Database ID:
- RPEP-00757
Evidence Hierarchy
Frequently Asked Questions
Can immune cells make growth hormone?
Yes. This study shows lymphocytes produce their own GH when stimulated by growth hormone peptides. This means GH secretagogues may boost immunity not just through the pituitary but directly at the immune cell level.
Why does this matter?
It suggests GH secretagogues have direct immune-boosting effects. When you take a GH peptide, it doesn't just raise systemic GH from the pituitary — it may also enhance immune cell function through local GH production.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-00757APA
Poppi, L; Dixit, V D; Baratta, M; Giustina, A; Tamanini, C; Parvizi, N. (2002). Growth hormone secretagogue (GHS) analogue, hexarelin stimulates GH from peripheral lymphocytes.. Experimental and clinical endocrinology & diabetes : official journal, German Society of Endocrinology [and] German Diabetes Association, 110(7), 343-7.
MLA
Poppi, L, et al. "Growth hormone secretagogue (GHS) analogue, hexarelin stimulates GH from peripheral lymphocytes.." Experimental and clinical endocrinology & diabetes : official journal, 2002.
RethinkPeptides
RethinkPeptides Research Database. "Growth hormone secretagogue (GHS) analogue, hexarelin stimul..." RPEP-00757. Retrieved from https://rethinkpeptides.com/research/poppi-2002-growth-hormone-secretagogue-ghs
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.