The Hypothalamic GH Secretagogue Receptor Controls Both Growth Hormone and Body Weight | Research

The takeaway

Antisense knockdown of hypothalamic GHS-R reduced both GH secretion and body weight gain in rats, confirming the receptor's dual role in regulating growth hormone and appetite/adiposity.

One receptor, two functions
Knocking down hypothalamic GHS-R reduced BOTH GH secretion AND feeding — growth and appetite are controlled by the same brain receptor

What the researchers found

Hypothalamic GHS-R antisense knockdown reduced both GH secretion and body weight/food intake in rats, confirming the hypothalamic receptor's dual role in mediating GH release and appetite regulation by ghrelin/GHS.

Why it matters

Confirming the hypothalamic GHS-R controls both GH and appetite means drugs targeting this receptor will inevitably affect both — a key consideration for GH secretagogue therapy.

How the study worked

Animal study using intracerebroventricular antisense oligonucleotides to knock down GHS-R in the rat hypothalamus. GH secretion, food intake, and body weight measured following receptor reduction.

What this study cannot tell us

Antisense knockdown is partial and temporary. The specific hypothalamic nuclei affected were not precisely mapped.

How to read the evidence

Moderate evidence from a loss-of-function antisense study confirming the hypothalamic GHS-R's dual role.

When this study was published

Published in 2002. The GHS-R's dual control of GH and appetite has been extensively confirmed.

The bigger picture

The same brain receptor controlling growth and appetite represents an evolutionary link — growing organisms need to eat. This coupling means GH secretagogues cannot easily separate GH from appetite effects.

Questions still open

Can GH release and appetite effects of GHS-R be pharmacologically separated?
Does the dual function explain why GH secretagogues increase appetite?
Could tissue-selective GHS-R targeting avoid appetite side effects?

Common questions

Why do GH peptides increase appetite?

Because the same brain receptor (GHS-R) controls both growth hormone release and appetite. This study proves they're linked at the receptor level — you can't easily get one effect without the other.

Can this be fixed?

Separating GH from appetite effects is challenging since they share a receptor. Some GH secretagogues (like ipamorelin) are more selective, but perfectly separating these effects remains an ongoing drug design challenge.

Read the original research

Hypothalamic growth hormone secretagogue receptor regulates growth hormone secretion, feeding, and adiposity.

The Journal of clinical investigation, 109(11), 1429-36

View on PubMed ↗

Citation

Shuto, Yujin; Shibasaki, Tamotsu; Otagiri, Asuka; Kuriyama, Hideki; Ohata, Hisayuki; Tamura, Hideki; Kamegai, Jun; Sugihara, Hitoshi; Oikawa, Shinichi; Wakabayashi, Ichiji. (2002). Hypothalamic growth hormone secretagogue receptor regulates growth hormone secretion, feeding, and adiposity.. The Journal of clinical investigation, 109(11), 1429-36.