Ghrelin Does Not Directly Stimulate Secretion of Glucagon-like Peptide-1

What Was Tested

Researchers studied Ghrelin in this randomized controlled trial publication.

To investigate the putative effect of ghrelin on GLP-1 secretion in vivo and in vitro.

Why It Was Studied

The gastrointestinal hormone ghrelin stimulates growth hormone secretion and appetite, but recent studies indicate that ghrelin also stimulates the secretion of the appetite-inhibiting and insulinotropic hormone glucagon-like peptide-1 (GLP-1).

Who Took Part

By PubMed's age tags, the people studied were adults, middle-aged adults and older adults, men only.

A randomized placebo-controlled crossover study was performed in eight hypopituitary subjects.

How the Study Was Run

The researchers set it up as a randomized, double-blind, placebo-controlled and crossover study.

Random assignment meant chance, not the researchers, decided who got Ghrelin and who got the comparison, which limits bias.

Neither the participants nor the staff measuring them knew who was on Ghrelin, so expectations could not easily colour the readings.

A placebo (an inactive look-alike) gave the Ghrelin group a baseline to be compared against.

Each person switched between Ghrelin and the comparison at some point, usually with a gap in between.

Mouse small intestine was perfused (n = 6) and GLP-1 output from perfused mouse small intestine was investigated in response to vascular ghrelin administration in the presence and absence of a simultaneous luminal glucose stimulus.

Ghrelin receptor expression was quantified in human (n = 11) and mouse L-cells (n = 3) by RNA sequencing and RT-qPCR, respectively.

What Was Measured

The gastrointestinal hormone ghrelin stimulates growth hormone secretion and appetite, but recent studies indicate that ghrelin also stimulates the secretion of the appetite-inhibiting and insulinotropic hormone glucagon-like peptide-1 (GLP-1).

The subject headings attached to it are Administration, Intravenous, Cells, Cultured, Denmark, Ghrelin, Glucagon-Like Peptide 1, Hypopituitarism and Intestinal Mucosa.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Ghrelin.

Its findings take up roughly 5 sentences of the abstract and are left out here on purpose; the source paper is the place to read them.

The publication is from 2020 (The Journal of clinical endocrinology and metabolism), a journal based in United States.

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