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GHRP-6

Growth Hormone Releasing Peptide-6, Growth hormone-releasing hexapeptide, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2

Quick Stats
Studies 702
Trials 0
Overview Studies Clinical Trials
Score 3
2012 pubmed

Islet β-cell ghrelin signaling for inhibition of insulin secretion.

Dezaki. Katsuya K; Yada. Toshihiko T

View on DOI View Original Source

Key Findings

  • Ghrelin produced in pancreatic beta‑cells reduces insulin secretion in mice, rats, and humans.
  • Pharmacological or genetic inhibition of islet‑derived ghrelin boosts glucose‑stimulated insulin release.
  • Ghrelin works by lowering cAMP/PKA signaling, activating potassium channels, and dampening calcium influx needed for insulin release.

Practical Outcomes

  • If you use ghrelin‑mimicking peptides like GHRP‑6 for growth‑hormone boosting, expect a possible drop in insulin response, which could affect glucose handling and body‑composition goals. Consider monitoring blood glucose and timing GHRP‑6 away from meals, or explore ghrelin antagonists if you aim to improve insulin sensitivity.

Summary

The study shows that ghrelin, a hormone also released in the pancreas, can suppress insulin release. Blocking ghrelin in the islets makes the pancreas secrete more insulin when you eat sugar. This means that drugs or peptides that act like ghrelin (such as GHRP‑6) could lower insulin spikes and affect blood‑sugar control.

Abstract

Ghrelin, an acylated 28-amino acid peptide, was isolated from the stomach, where circulating ghrelin is produced predominantly. In addition to its unique role in regulating growth-hormone release, mealtime hunger, lipid metabolism, and the cardiovascular system, ghrelin is involved in the regulation of glucose metabolism. Ghrelin is expressed in pancreatic islets and released into pancreatic microcirculations. Ghrelin inhibits insulin release in mice, rats, and humans. Pharmacological and genetic blockades of islet-derived ghrelin markedly augment glucose-induced insulin release. The signal transduction mechanisms of ghrelin in islet β-cells are very unique, being distinct from those utilized for growth-hormone release. Ghrelin attenuates the glucose-induced cAMP production and PKA activation, which drives activation of Kv channels and suppression of the glucose-induced [Ca(2+)](i) increase and insulin release in β-cells. Insulinostatic function of the ghrelin-GHS-R system in islets is a potential therapeutic target for type 2 diabetes.

Study Information

Provider

pubmed

Year

2012

DOI

10.1016/b978-0-12-381272-8.00020-9