Ghrelin stimulation of growth hormone isoforms: parallel secretion of total and 20-kDa growth hormone and relation to insulin sensitivity in healthy humans

What Was Tested

This randomized controlled trial paper looks at Ghrelin.

To investigate the effect of ghrelin on 20-kDa and total hGH secretion in healthy, nonobese subjects.

Why It Was Studied

The 20-kDa human GH (hGH) is produced in the pituitary by alternative splicing of the hGH-N gene.

The 20-kDa hGH promotes growth similarly to 22-kDa or total hGH, the predominant form in circulation, but the relative effects of these isoforms on glucose metabolism have been debated.

Who Took Part

The study group was 14 subjects.

By PubMed's age tags, the people studied were teenagers, young adults and adults, both men and women.

How the Study Was Run

The researchers set it up as a randomized study.

The subjects were allocated by chance, so the Ghrelin group and the comparison group should start out alike.

Ghrelin was infused for 45 min to achieve steady-state levels and continued through a 3-h frequently sampled i.v. glucose tolerance test.

Insulin sensitivity index was quantified using the minimal model of glucose kinetics.

What Was Measured

Topics PubMed links to this paper include Blood Glucose, Ghrelin, Homeostasis, Human Growth Hormone, Insulin, Insulin Resistance and Isomerism.

What This Means in Plain Language

The paper is a randomized study of Ghrelin in 14 subjects.

With fewer than 40 people, it is a small study, so it is better read as an early signal for further research than as a settled answer.

Its findings take up roughly 7 sentences of the abstract and are left out here on purpose; the source paper is the place to read them.

The publication is from 2012 (The Journal of clinical endocrinology and metabolism), a journal based in United States.

More context: the Ghrelin compound page, all human trials.