Specific ghrelin and synthetic GH secretagogue binding sites were identified on human breast, prostate, and lung cancer cells, with functional activity suggesting the ghrelin system may influence cancer cell behavior.
On 3 cancer typesFunctional ghrelin receptors found on breast, prostate, AND lung cancer cells — the three most common cancers
What the researchers found
Functional ghrelin and synthetic GHS receptors were identified on human breast, prostate, and lung cancer cells, with receptor subtypes potentially different from those in normal pituitary tissue.
Why it matters
If cancer cells respond to ghrelin and GH secretagogues, this has dual implications: potential cancer therapeutic targets AND safety concerns for people using GH peptides.
How the study worked
In-vitro binding study using radioligands on human cancer cell lines (breast, prostate, lung). Binding competition with ghrelin and synthetic GHS. Functional signaling assessed by second messenger assays.
What this study cannot tell us
In-vitro cancer cell line study. Receptor presence doesn't determine whether activation promotes or inhibits cancer growth. Cell lines may not represent primary tumors.
How to read the evidence
Preliminary in-vitro evidence identifying functional receptors on cancer cells, raising important questions but not determining clinical significance.
When this study was published
Published in 2001. The ghrelin-cancer relationship has been further studied with mixed results — some studies showing growth promotion, others inhibition, depending on cancer type.
The bigger picture
The ghrelin receptor system's presence on common cancers means it could either promote or inhibit tumor growth. This creates both a therapeutic opportunity and a safety question for the growing use of GH secretagogues.
Questions still open
- Does ghrelin signaling promote or inhibit cancer cell growth?
- Should GH secretagogue users be concerned about cancer risk?
- Could ghrelin receptor-targeted drugs be developed for cancer therapy?
Common questions
Do GH peptides affect cancer?
Should people with cancer avoid GH peptides?
Read the original research
Identification, characterization, and biological activity of specific receptors for natural (ghrelin) and synthetic growth hormone secretagogues and analogs in human breast carcinomas and cell lines.
The Journal of clinical endocrinology and metabolism, 86(4), 1738-45
Citation
Cassoni, P; Papotti, M; Ghè, C; Catapano, F; Sapino, A; Graziani, A; Deghenghi, R; Reissmann, T; Ghigo, E; Muccioli, G. (2001). Identification, characterization, and biological activity of specific receptors for natural (ghrelin) and synthetic growth hormone secretagogues and analogs in human breast carcinomas and cell lines.. The Journal of clinical endocrinology and metabolism, 86(4), 1738-45.