This record provides bibliographic details and links to the original research. An editorial study breakdown is not available.
What the researchers found
Hexarelin (10.56 mcg/day continuous infusion) increased pulsatile GH secretion in MC4RKO obese mice, reducing visceral fat and liver triglycerides while improving insulin sensitivity without altering IGF-1 or insulin levels.
Why it matters
Obesity reduces GH secretion, creating a vicious cycle of more fat storage. Restoring pulsatile GH release with a small peptide could break this cycle without the side effects of direct GH injection (which raises IGF-1 and can worsen insulin resistance).
The numbers in context
10.56 mcg/day hexarelin; 3-4 weeks; increased pulsatile GH; reduced visceral fat; reduced liver TG; improved insulin sensitivity; no IGF-1/insulin change
How the study worked
MC4R knockout obese mice pair-fed and infused continuously with hexarelin (10.56 mcg/day) or vehicle via osmotic pump for 3-4 weeks. Pulsatile GH secretion, lipolysis, lipid oxidation, de novo lipogenesis, insulin sensitivity, glucose tolerance, and GH signaling gene expression measured.
Who was studied
MC4R knockout obese mice (pair-fed)
What this study cannot tell us
Mouse model (MC4RKO, not typical human obesity). Pair-fed design controls for food intake but limits ecological validity. Continuous hexarelin infusion via pump is not practical for human use. Only 3-4 weeks of treatment. Hexarelin is not FDA-approved.
Read the original research
Stimulation of endogenous pulsatile growth hormone secretion by activation of growth hormone secretagogue receptor reduces the fat accumulation and improves the insulin sensitivity in obese mice.
FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 35(1), e21269
Citation
Huang, Zhengxiang; Lu, Xuehan; Huang, Lili; Zhang, Chunhong; Veldhuis, Johannes D; Cowley, Michael A; Chen, Chen. (2021). Stimulation of endogenous pulsatile growth hormone secretion by activation of growth hormone secretagogue receptor reduces the fat accumulation and improves the insulin sensitivity in obese mice.. FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 35(1), e21269. https://doi.org/10.1096/fj.202001924RR